A   B   C   D   E   F   G   H   I   K   L   M   O   P   Q   R   S   T   U   V   W  

booster

Paper Title Other Keywords Page
MOPAN003 A New Family of Power Supplies for the LNLS Orbit Correctors power-supply, storage-ring, controls, synchrotron 146
 
  • C. Rodrigues
  • L. H. Oliveira, A. R. Silva
    LNLS, Campinas
  Recently the substitution of the older family of orbit corrector power supplies of the LNLS electron storage ring was proposed and a new family has been developed. The new model incorporates additional features such as natural ventilation, unit power factor and shorter response time to reference changes. Moreover, higher efficiency and lower weight and size were obtained. At the moment eight units are operating with storage ring orbit correctors, with current and output voltage up to 10A/10V. This family has three stages of power processing. The first one is a power factor corrector using the boost topology, which gives to the second stage a DC voltage about 400V with regulation and ripple better than 1%. The second stage is an isolated half-bridge with two symmetric adjustable DC outputs from 0 to 40V. The last stage consists of a bipolar series linear regulator using Bipolar Transistors (BJT). Some results obtained for this power supply were: output current ripple and one day stability better than 150ppm, reference voltage step response better than 500A/s with the existing orbit corrector magnet, efficiency higher than 62% and power factor better than 98.5%.  
 
MOPAN005 Injector Improvements at the Brazilian Synchrotron Light Source injection, synchrotron, linac, storage-ring 152
 
  • P. F. Tavares
  • F. Arroyo, R. H.A. Farias, L. C. Jahnel, C. Pardine, C. Rodrigues
    LNLS, Campinas
  We present the results of hardware, software and operational improvements implemented at the injector complex of the 1.37 GeV electron storage ring of the Brazilian Synchrotron Light Source (LNLS) with the aim of improving injector stability and reliability, thus reducing the injection time. The improvements include changes to the 120 MeV injector LINAC RF system and high power modulators, injection automation and the implementation of a new procedure for reusing the current at the end of each user's shifts before injection by ramping the energy back down to 500 MeV (the injection energy) without dumping the beam. All of these changes allowed us to significantly reduce the overall time from the end of a shift to the delivery of beam in the following shift with a positive impact on the reduction of injection thermal transients for the storage ring and beamlines. Further improvements are expected in the near future as a result of planned changes to the injection timing system and of the installation of a recently assembled upgrade of the 500 MeV booster synchrotron RF system  
 
MOPAN025 The Elettra Booster Magnets dipole, sextupole, quadrupole, multipole 206
 
  • D. Zangrando
  • D. Castronovo, M. Svandrlik, R. Visintini
    ELETTRA, Basovizza, Trieste
  The third generation light source ELETTRA has been in operation since 1993. A new 2.5 GeV full energy booster injector, that will replace the existing linear injector limited to a maximum energy of 1.2 GeV is now under construction and the commissioning will start this August. The paper reports on the construction of dipole, quadrupole, sextupole and steerer magnets and on the magnetic measurement results with a comparison with the requested specifications.  
 
MOPAN048 Design of Injection Pulsed Magnets for SESAME Ring kicker, injection, septum, storage-ring 266
 
  • S. Varnasseri
  • M. M. Shehab, G. Vignola
    SESAME, Amman
  In this paper the SESAME storage ring injection pulsed magnet system is described. The injection process in the SESAME storage ring requires septum and kicker magnets. In this paper we discuss the geometrical and magnetic field requirements for septum and kicker magnets and present the results obtained from magnetic field analysis and also the optimization of titanium coating for the injection kicker chambers. The final specification for thin septum and injection kickers are also presented.  
 
MOPAN089 Numerical Simulation Applied to the Air Temperature Control and Improvement at the TLS storage-ring, simulation, controls, synchrotron 368
 
  • J.-C. Chang
  • M. Ke
    NTUT, Taipei
  • Z.-D. Tsai
    NSRRC, Hsinchu
  This paper presents the numerical simulation studies applied on the air temperature control and improvement at the Taiwan Light Source (TLS). To improve air temperature control and study the flow circulation in air conditioned areas, we had applied the computational fluid dynamic (CFD) scheme to the experimental hall, the storage ring tunnel, a technical zone and the booster area, respectively. We review those studies by examining the governing equations, the model construction, mesh generation, boundary conditions, convergence criterion and validation of simulations.  
 
MOPAN090 Logging of Operation Data at TLS injection, feedback, kicker, linac 371
 
  • C.-K. Chang
  • H. C. Chen, M. J. Horng, J. A. Li, T. F. Lin, Y. K. Lin, Y.-C. Liu
    NSRRC, Hsinchu
  The Taiwan Light Source had been Top-Up operation in October 2005 and the beam current had increased to 300mA in early 2006. For normal operation, there are some important parameters of Top-up operation, such as beam stability, filling pattern and injection efficiency etc. These data have to be recorded and to be reference for the accelerator operating. Therefore, a LabVIEW-based data logging system had been developed. The system handles communication with other instruments via Ethernet and IEEE-488 interconnections. In this report, the design concept and the current status are described. The planned improvements are carried out in the future.  
 
MOPAN096 A Safety Protection Device for Bypass Capacitor of the White Circuit power-supply, controls, synchrotron, radiation 389
 
  • C.-Y. Liu
  • K.-B. Liu, H. M. Shih
    NSRRC, Hsinchu
  This paper presents a new safety protection system for the bypass capacitor in the white circuit. In general, if the operation current of the white circuit deviates too much, the injection efficiency will be deteriorated and the white circuit bypass capacitor will be hurt. In order to detect the dynamic characteristics of the bypass capacitor to achieve protection function, the new protection system is proposed in this paper. The experimental results show that new protection system not only can monitor and detect the dynamic voltage and current of the bypass capacitor of the white circuit, but also prevent this bypass capacitor from being damaged.  
 
MOPAN103 New Control System for the 50 MeV Linear Accelerator of TLS controls, linac, gun, vacuum 404
 
  • C. Y. Wu
  • J. Chen, K. T. Hsu, S. Y. Hsu, J.-Y. Hwang, D. Lee, K.-K. Lin, C.-J. Wang
    NSRRC, Hsinchu
  The preinjector of the Taiwan Light Source(TLS) is consist of a 140 kV themionic gun and a 50 MeV traveling wave type linear accelerator system. In order to improve performance, to decouple the vacuum interlock logic from the linac control system, and to provide a better control functionality for top-up operation and to avoid obsolescence, linac control system have been renew. One VME crate system is dedicated for linac control, new hardware equips with high resolution of analog interface to provide better control. Vacuum interlock logic will be done be a dedicated programmable logic controller(PLC). The remained linac devices have sequential control needed will be done by another PLC, such as door access interlock, klystron warm up, gun warm up, trig interlock, gun high voltage interlock, klystron modulator high voltage interlock, water flow interlock. Both interlock and sequence control PLC will control by the VME crate. All the other functions without interlock or sequence requirement will control by the VME crate directly. New control system expects to provide better control functionality, better performance, easy for maintenance, and useful easy to add new hardware equipments.  
 
MOPAN111 Modbus/TCP Controller for the Power Supplies in ALS BTS Beam Line power-supply, controls, synchrotron, storage-ring 425
 
  • S. Cohen
  • M. W. Sherman, W. D. Sherman
    Alpha Scientific Electronics, Hayward, CA
  The development, testing and commissioning of a self-contained power supply controller for four 100 KW power supplies for the upgraded Booster to Storage Ring (BTS) beam line at the Advanced Light Source at the Lawrence Berkeley Laboratory, is presented. The power supply controller, is a 3U high, rack-mount chassis, that contains the regulation control-loop amplifiers, 16-bit DAC with microcontroller and aμPLC( Programmable Logic Controller) for power-supply state-machine control. Local control is achieved via push-buttons and a color LCD touch screen. Remote control is mediated viaμPLC using embedded Modbus/TCP. Using a unique, data logging system, the operational parameters of the regulation loop can be safely monitored and recorded while the system is running at full power. The entire design is based on optimum reliability, safety and ease of troubleshooting and repair. A modular design for key control components, allows the power supply to operate in a nominal mode, even if one or two ancillary internal modules fail. This allows for continued beam operation until it is convenient to service the unit, keeping beam availability as high as possible.  
 
MOPAN114 A Linear MOSFET Regulator for Improving Performance of the Booster Ramping Power Supplies at the APS power-supply, controls, simulation, injection 434
 
  • G. Feng
  • B. Deriy, J. Wang
    ANL, Argonne, Illinois
  Funding: Work supported by U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-06CH11357.

Due to the circuit topology of ramping power supplies used in the APS Booster ring, they are unable to follow the linear current ramp to the desired accuracy of 0.1%. In addition, those supplies are also sensitive to AC line perturbation. To improve the performance, a linear regulator using paralleled MOSFET devices in series with the power supply is proposed. The control algorithm uses a real-time current feedback loop to force the MOSFETs to work in the linear operation mode. By using this linear MOSFET regulator, the MOSFETs' drain to source voltage, and hence the voltage imposed on magnets can be regulated very quickly. As a result, the regulation of the magnet current can be improved significantly. So far the simulation results show that with the linear regulator the current regulation can be improved to better than 0.1%. Because of the high bandwidth of the linear regulator, it can reduce the harmonic content in the output current as well as the noises due to the AC line disturbance. A sextupole power supply has been set up to verify the proposed topology. This paper discusses the circuit topology, the regulation algorithm, and the experiment results.

 
 
MOPAS005 System Overview for the Multi-element Corrector Magnets and Controls for the Fermilab Booster power-supply, controls, acceleration, monitoring 449
 
  • C. C. Drennan
  • M. Ball, A. R. Franck, D. J. Harding, P. A. Kasley, G. E. Krafczyk, M. J. Kucera, J. R. Lackey, D. McArthur, J. R. Misek, W. Pellico, E. Prebys, A. K. Triplett, D. Wolff
    Fermilab, Batavia, Illinois
  Funding: Work supported by the U. S. Department of Energy

To better control the beam position, tune, and chromaticity in the Fermilab Booster synchrotron, a new package of six corrector elements has been designed, incorporating both normal and skew orientations of dipole, quadrupole, and sextupole magnets. The devices are under construction and will be installation in 48 locations in the Booster accelerator. Each of these 288 corrector magnets will be individually powered. Each of the magnets will be individually controlled using operator programmed current ramps designed specifically for the each type of Booster acceleration cycle. This paper provides an overview of the corrector magnet installation in the accelerator enclosure, power and sensor interconnections, specifications for the switch-mode power supplies, rack and equipment layouts, controls and interlock electronics, and the features of the operator interface for programming the current ramps and adjusting the timing of the system triggers.

 
 
MOPAS006 Design and Fabrication of a Multi-element Corrector Magnet for the Fermilab Booster Synchrotron quadrupole, sextupole, dipole, synchrotron 452
 
  • D. J. Harding
  • J. DiMarco, C. C. Drennan, V. S. Kashikhin, S. Kotelnikov, J. R. Lackey, A. Makarov, A. Makulski, R. Nehring, D. F. Orris, E. Prebys, P. Schlabach, G. Velev, D. G.C. Walbridge
    Fermilab, Batavia, Illinois
  Funding: Work supported by the U. S. Department of Energy under Contract No. DE-AC02-76CH03000.

To better control the beam position, tune, and chromaticity in the Fermilab Booster synchrotron, a new package of six corrector elements has been designed, incorporating both normal and skew orientations of dipole, quadrupole, and sextupole magnets. The devices are under construction and installation at 48 locations is planned. The density of elements and the rapid slew rate have posed special challenges. The magnet construction is presented along with DC measurements of the magnetic field.

 
 
MOPAS016 New Corrector System for the Fermilab Booster controls, quadrupole, sextupole, dipole 467
 
  • E. Prebys
  • C. C. Drennan, D. J. Harding, V. S. Kashikhin, J. R. Lackey, A. Makarov, W. Pellico
    Fermilab, Batavia, Illinois
  Funding: Work supported under DOE contract DE-AC02-76CH03000.

The Fermilab neutrino program places unprecedented demands on the lab's 8 GeV Booster synchrotron, which has not changed significantly since it was built almost 35 years ago. In particular, the existing corrector system is not adequate to control beam position and tune throughout the acceleration system, and provides limited compensation for higher order resonances. We present an ambitious ongoing project to build and install a set of 48 corrector packages, each containing horizontal and vertical dipoles, normal and skew quadrupoles, and normal and skew sextupoles. Space limitations in the machine have motivated a unique design, which utilizes custom wound coils around a 12 pole laminated core. Each of the 288 discrete multipole elements in the system will have a dedicated power supply, the output current of which is controlled by an individual programmable ramp. This provides for great flexibility in the system, but also presents a challenge in terms of designing the control hardware and software in such a way that the system can be operated in the most efficacious way.

 
 
MOPAS021 Slowly Rotating Coil System for AC Field Measurements of Fermilab Booster Correctors dipole, sextupole, quadrupole, synchrotron 476
 
  • G. Velev
  • J. DiMarco, D. J. Harding, V. S. Kashikhin, M. J. Lamm, P. Schlabach, M. Tartaglia, J. C. Tompkins
    Fermilab, Batavia, Illinois
  Funding: Work supported by the U. S. Department of Energy

A method for measurement of rapidly changing magnetic fields has been developed and applied to the testing of new room temperature corrector packages designed for the Fermilab Booster Synchrotron. The method is based on fast digitization of a slowly rotating tangential coil probe, with analysis combining the measured coil voltages across a set of successive magnet current cycles. This paper presents results on the field quality measured for normal and skew dipole, quadrupole, and sextupole magnets in several of these corrector packages.

 
 
MOPAS031 Hardware and Software Development and Integration in an FPGA Embedded Processor Based Control System Module for the ALS controls, instrumentation, feedback, power-supply 503
 
  • J. M. Weber
  • M. J. Chin, CA. Timossi, E. C. Williams
    LBNL, Berkeley, California
  Funding: This work was supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U. S. Department of Energy under Contract No. DE-AC02-05CH11231.

The emergence of Field Programmable Gate Arrays (FPGAs) with embedded processors and significant progress in their development tools have contributed to the realization of system-on-a-chip networked front-end systems. Embedded processors are capable of running full-fledged Real-Time Operating Systems (RTOSs) and serving channels via Ethernet while high speed hardware functions, such as digital signal processing and high performance interfaces, run simultaneously in the FPGA logic. Despite significant advantages of the system-on-a-chip implementation, engineers have shied away from designing such systems due to the perceived daunting task of integrating software to run a RTOS with custom hardware. However, advances in embedded development tools considerably reduce the effort required for software/hardware integration. This paper will describe the implementation and integration of software and hardware in an FPGA embedded processor system as illustrated by the design of a new control system module for the ALS.

 
 
MOPAS036 A Physics Based Approach for Ramping Magnet Control in a Compact Booster controls, injection, power-supply, storage-ring 515
 
  • S. M. Hartman
  • S. F. Mikhailov, V. Popov, Y. K. Wu
    FEL/Duke University, Durham, North Carolina
  Funding: Supported by US DoE grant #DE-FG02-01ER41175.

At Duke University, a booster synchrotron was recently commissioned as part of the HIGS upgrade. For the ramping magnet power supply controls, a scheme was developed to present the high level operator interface in terms of the physics quantities of the accelerator, i.e. the effective focusing strength of the magnets. This scheme allows for the nonlinearities of the magnets – a result of the extremely compact footprint of this booster – to be incorporated into the low level software. This facilitates machine studies and simplifies use of physics modeling. In addition, it simplifies operation, allowing the booster to ramp to any energy from the 0.27 GeV of the injector linac to the 1.2 GeV maximum of the Duke Storage Ring. The high level of flexibility of this system if further advanced by incorporating the level of tunability typically found in a storage ring control system. Tuning changes made during steady-state operation are automatically propagated to the waveforms which make up the booster ramp. This approach provides a good match to the wide operation modes of the Duke Storage Ring and its associated free electron laser, and may useful for other compact booster synchrotrons.

 
 
MOPAS038 Power Supply System for a Compact 1.2 GeV Booster Synchrotron power-supply, extraction, synchrotron, dipole 521
 
  • V. Popov
  • M. D. Busch, S. M. Hartman, S. F. Mikhailov, O. Oakeley, P. W. Wallace, Y. K. Wu
    FEL/Duke University, Durham, North Carolina
  Funding: Supported by US DoE grant #DE-FG02-01ER41175.

A booster synchrotron has been recently commissioned at Duke University as part of the High Intensity Gamma-ray Source (HIGS) upgrade. All dipole and quadrupole magnets are fed by the same power supply in order to facilitate synchronization. A 500kW retired thyristor controlled power supply has been completely rebuilt to provide high accuracy ramping of current in the range between 150A and 700A in a 1.3 sec repetition cycle. Reproducibility of current at extraction energy is better than 0.1% for entire operational range of energy. Conflict of a fast ramping operation and a magnet protection in the case of emergency shutdown was resolved using additional thyristor switches. All trim power supplies involved in ramp have been matched with the main power supply for the time response and voltage range. The injection and extraction schemes require rapidly ramping Y-correctors. The required peak power about 4 kW in these correctors is provided by a combining a low voltage DC power supply and a pulse boosting circuit. We present the challenges of designing and developing booster power supply system. And also we report measured performance and operational experience in this paper.

 
 
MOPAS096 Simulations of the AGS MMPS Storing Energy in Capacitor Banks controls, power-supply, simulation, pulsed-power 652
 
  • I. Marneris
  • S. V. Badea, R. Bonati, T. Roser, J. Sandberg
    BNL, Upton, Long Island, New York
  Funding: Work performed under the auspices of the US Department of Energy

The Brookhaven AGS Main Magnet Power Supply (MMPS) is a thyristor control supply rated at 5500 Amps, ±9000 Volts. The peak magnet power is 50 MWatts. The power supply is fed from a motor/generator manufactured by Siemens. The generator is 3 phase 7500 Volts rated at 50 MVA. The peak power requirements come from the stored energy in the rotor of the motor/generator. The motor generator is about 45 years old and Siemens is not manufacturing similar machines in the future. We are therefore investigating different ways of storing energy for future AGS MMPS operation. This paper will present simulations of a power supply where energy is stored in capacitor banks. Two dc to dc converters will be presented. The switching elements would be IGCT's made by ABB. The simulation program used is called PSIM Version 6.1. The control system of the power supply will also be presented. The average power from the Long Island Power Authority (LIPA) into the power supply will be kept constant during the pulsing of the magnets at ±50 MW. The reactive power will also be kept constant below 1.5 MVAR. Waveforms will be presented.

 
 
MOPAS102 Design of Beam Transfer Lines for the NSLS II injection, storage-ring, extraction, quadrupole 664
 
  • N. Tsoupas
  • R. Heese, R. Meir, I. Pinayev, J. Rose, T. V. Shaftan, C. Stelmach
    BNL, Upton, Long Island, New York
  Funding: Work supported by the US Department of Energy

The proposed NSLS II light source* to be built at Brookhaven National Laboratory utilizes a LINAC and a Booster with a Storage-ring which share the same tunnel, but at different horizontal planes. The Booster which accepts beam from the LINAC, accelerates the electron beam to an energy of 3.0 GeV and the beam is extracted to the BoostertoStorageRing(BtS) transport line. The BtS line transports the beam and injects it into the Storage ring . In order to facilitate the design of the BtS transfer line, the line has been partitioned in three sections which can be considered as independent. The function of each the three sections will be discussed in details and the procedure for the design of the BtS line and other details about the optics and the magnetic elements of the line will be presented in the paper. The LINAC to Booster beam transfer line will also be discussed.

*NSLS II CDR BNL

 
 
TUZBKI01 Present and Future High-Energy Accelerators for Neutrino Experiments proton, target, injection, extraction 731
 
  • I. Kourbanis
  Application of high-energy proton accelerators for high-intensity neutrino beam production is a challenging task from standpoints of accelerator physics and operation. An overview of the machines presently used for neutrino experiments will be given as well as of the future projects, in particular of the Fermilab accelerator complex conversion after the Tevatron Run II completion.  
slides icon Slides  
 
TUODKI03 Multi-batch Slip Stacking in the Main Injector at Fermilab injection, kicker, simulation, beam-losses 742
 
  • K. Seiya
  • T. Berenc, B. Chase, J. E. Dey, P. W. Joireman, I. Kourbanis, J. Reid
    Fermilab, Batavia, Illinois
  The Main Injector (MI) is going to use slip stacking scheme for the NuMI neutrino experiment for effectively increasing proton intensity to the NuMI target by about a factor two in a MI cycle. The MI is going to accept 11 pluses at injection energy from the Booster and accelerate them to 120 GeV. By using Slip stacking, two of them are merged into one and sent to Anti-proton production and 9 of them, one single and four doubled density pulses, are going to be sent to the Numi beam line. We have been doing low intensity beam studies with 11 pulses injection and accelerated them with the total intensity of 3·1012 ppp to 120GeV. We discuss beam loss and technical issues on multi-batch slip stacking.  
slides icon Slides  
 
TUOAAB02 Measurement and Simulation of Space-Charge Dependent Tune Separation in FNAL Booster coupling, space-charge, quadrupole, simulation 772
 
  • D. O. McCarron
  • J. F. Amundson, W. Pellico, P. Spentzouris, R. E. Tomlin
    Fermilab, Batavia, Illinois
  • L. K. Spentzouris
    Illinois Institute of Technology, Chicago, Illinois
  In recent years, a number of space-charge studies have been performed in the FNAL Booster. The Booster is the first circular accelerator in the Fermilab chain of accelerators, with an injection energy of 400 MeV. The combination of this relatively low injection energy and improving beam intensity for Booster's high intensity applications necessitates a study of space charge dynamics. Measurement and simulation of space charge coupling in the Booster will be presented. The coupling measurement was performed using a standard technique, albeit repeated for different injected beam intensities. The initial transverse tune separation was minimized (Qx=Qy=6.7), followed by a systematic skew quadrupole strength variation. Transverse beam oscillation frequencies were recorded while exciting the beam. These frequencies were recorded for a range of 1.0·1012 to 3.5·1012 particles. A linear increase in the measured tune separation with beam intensity was observed. For comparison, beam coupling was also simulated with the space-charge code Synergia. This code has successfully modeled the space-charge tune shift in the Booster*, and compares favorably to other space charge codes and analytic results.

* Synergia: A 3D Accelerator Modelling Tool with 3D Space Charge. Journal of Computational Physics, Volume 211, Issue 1 , 1 January 2006, Pages 229-248.

 
slides icon Slides  
 
TUOCAB01 A New Code for Orbit Response Matrix Analysis lattice, quadrupole, closed-orbit, simulation 804
 
  • L. Yang
  • X. Huang
    SLAC, Menlo Park, California
  • S.-Y. Lee
    IUCF, Bloomington, Indiana
  • B. Podobedov
    BNL, Upton, Long Island, New York
  Funding: NSF PHY-0552389, DOE DE-FG02-92ER40747

The Orbit Response Matrix (ORM) has been successfully used extensively in accelerator modeling. However, in many cases, the existing codes can not find a correct model. We develop a new code that solve the convergence and coupling problems. We test our code by carrying out systematic study of accelerator models. Effects measurement errors and the completeness of information will be addressed in this study. Possible inclusion of phase information will be discussed.

 
slides icon Slides  
 
TUPMN007 Final Commissioning Results from the Injection System for the Australian Synchrotron Project injection, synchrotron, quadrupole, sextupole 926
 
  • S. V. Weber
  • F. Bødker, H. Bach, N. Hauge, J. Kristensen, L. K. Kruse, S. P. Møller, S. M. Madsen
    Danfysik A/S, Jyllinge
  • M. J. Boland, R. T. Dowd, G. LeBlanc, M. J. Spencer, Y. E. Tan
    ASP, Clayton, Victoria
  • N. H. Hertel, J. S. Nielsen
    ISA, Aarhus
  Danfysik has delivered a full-energy turn-key injection system for the Australian Synchrotron. The system consists of a 100 MeV linac, a low-energy transfer beamline, a 130 m circumference 3-GeV booster, and a high energy transfer beamline. The booster lattice was designed to have many cells with combined-function magnets (dipole, quadrupole and sextupole fields) in order to reach a very small emittance. The injection system has been commissioned and found to deliver a beam with an emittance of less than 30 nm, and currents in single- and multi-bunch mode in excess of 0.5 and 5 mA, respectively, fulfilling the contractual performance specifications. The repetition frequency is 1 Hz. Results from the commissioning of the system will be presented.  
 
TUPMN032 The New Elettra Booster Injector controls, dipole, quadrupole, kicker 983
 
  • M. Svandrlik
  • S. Bassanese, A. Carniel, K. Casarin, D. Castronovo, P. Craievich, G. D'Auria, R. De Monte, P. Delgiusto, S. Di Mitri, A. Fabris, R. Fabris, M. Ferianis, F. Giacuzzo, F. Iazzourene, G. L. Loda, M. Lonza, F. M. Mazzolini, D. M. Molaro, G. Pangon, C. Pasotti, G. Penco, L. Pivetta, L. Rumiz, C. Scafuri, G. Tromba, A. Vascotto, R. Visintini, D. Zangrando
    ELETTRA, Basovizza, Trieste
  • L. Picardi, C. Ronsivalle
    ENEA C. R. Frascati, Frascati (Roma)
  The new full energy injector for Elettra is under construction. The complex is made of a 100 MeV linac and a 2.5 GeV synchrotron, at 3 Hz repetition rate. With the new injector top-up operation shall be feasible. In the first semester of 2007 the machine assembly has been performed. In Summer 2007 the commissioning is scheduled, while in Fall 2007 the connection to the Storage Ring is planned. The status of the project will be reported in this paper.  
 
TUPMN066 Status of the ALBA Project vacuum, storage-ring, injection, septum 1073
 
  • D. Einfeld
  The construction of ALBA, the 3 GeV third generation Synchrotron Light Source near Barcelona (Spain) is proceeding according to schedule. The works for the building started in June 2006 and access to the building for installation of the 100 MeV Linac is expected at the end of 2007. Most of the machine components are already under construction and some have already been delivered. This report will concentrate on recent design developments, component choices and current status. Also the results on the first prototypes will be discussed. Other papers at this conference deal with accelerator physics issues and low level RF.  
 
TUPMN074 Improvements to the Injection Efficiency at the Taiwan Light Source injection, storage-ring, septum, quadrupole 1091
 
  • Y.-C. Liu
  • H.-P. Chang, J. Chen, P. J. Chou, K. T. Hsu, K. H. Hu, C. H. Kuo, C.-C. Kuo, K.-K. Lin, G.-H. Luo, M.-H. Wang
    NSRRC, Hsinchu
  Taiwan light source started the 200 mA top-up operation in October 2005, and the stored beam current was subsequently ramped up to 300 mA top-up operation. In the early phase of top-up operation, the injection efficiency had large variation at different machine condition. We have developed the procedures to maintain the injection efficiency. These optimization procedures will be activated whenever the injection efficiency degrades during the top-up operation of TLS.  
 
TUPMN086 Operation of the Diamond Light Source Injector linac, storage-ring, injection, single-bunch 1112
 
  • C. Christou
  • V. C. Kempson
    Diamond, Oxfordshire
  The Diamond Light source injector consists of a 100 MeV pre-injector linac and a 3 GeV full energy booster. The injection system has been reliably providing beam to the storage ring since September 2006 in both multibunch and single bunch mode, at 5 Hz repetition rate. All user operation at present is carried out in multibunch mode, with an injection efficiency up to 95%. Single bunch and hybrid modes are being developed now for users later this year. Differences in operation between multibunch and single bunch mode are largely restricted to the linac, although a small correction in booster sextupole ramp is needed for single bunch operation. Single bunch purity has been measured in the storage ring to be greater than 99.9%. The timing system can be controlled to allow a wide range of filling patterns, including complete ring fill in both single and multibunch mode, and hybrid fills with individual single bunches placed in gaps between continuous bunch trains. Top-up operation is envisaged for user operation in the future, and trials are underway to ensure safe and efficient running in this mode.  
 
TUPMS003 Status of the Top-off Upgrade of the ALS injection, radiation, brightness, storage-ring 1197
 
  • C. Steier
  • B. J. Bailey, K. M. Baptiste, W. Barry, A. Biocca, W. E. Byrne, M. J. Chin, R. J. Donahue, R. M. Duarte, M. P. Fahmie, J. Gath, S. R. Jacobson, J. Julian, J.-Y. Jung, S. Kwiatkowski, S. Marks, R. S. Mueller, H. Nishimura, J. W. ONeill, S. Prestemon, D. Robin, S. L. Rossi, F. Sannibale, T. Scarvie, D. Schlueter, D. Shuman, G. D. Stover, CA. Timossi, T. Warwick, J. M. Weber, E. C. Williams
    LBNL, Berkeley, California
  Funding: This work was supported by the Director, Office of Science, Office of Basic Energy Sciences, U. S. Department of Energy under Contract No. DE-AC02-05CH11231.

The Advanced Light Source is currently being upgraded for top-off operation. This major facility upgrade will provide an improvement in brightness from soft x-ray undulators of about one order of magnitude and keep the ALS competitive with the newest intermediate energy light sources. Major components of the upgrade include making the booster synchrotron capable of full energy operation, radiation safety studies, improvements to interlocks and collimation systems, diagnostics upgrades as well as emittance improvements in the main storage ring. The project status will be discussed as well as results of major parts of the commissioning.

 
 
TUPMS014 Commissioning of the Booster Injector Synchrotron for the HIGS Facility at Duke University extraction, injection, synchrotron, electron 1209
 
  • S. F. Mikhailov
  • O. Anchugov, N. Gavrilov, G. Y. Kurkin, Yu. Matveev, D. Shvedov, N. Vinokurov
    BINP SB RAS, Novosibirsk
  • M. D. Busch, M. Emamian, S. M. Hartman, Y. Kim, J. Li, V. Popov, G. Swift, P. W. Wallace, P. Wang, Y. K. Wu
    FEL/Duke University, Durham, North Carolina
  • C. R. Howell
    TUNL, Durham, North Carolina
  Funding: This work is supported by the US DoE grant #DE-FG02-01ER41175

A booster synchrotron has been built and recently commissioned at Duke University Free Electron Laser Laboratory (DFELL) as part of the High Intensity Gamma-ray Source (HIGS) facility upgrade. HIGS is developed collaboratively by the DFELL and Triangular Universities Nuclear Laboratory (TUNL). The booster will provide top-off injection into the Duke FEL storage ring in the energy range of 0.27 - 1.2 GeV. When operating the Duke storage ring to produce high energy Compton gamma ray beams above 20 MeV, continuous electron beam loss occurs. The lost electrons will be replenished by the booster injector operating in the top-off mode. The compactness of the booster posed a challenge for its development and commissioning. The booster has been successfully commissioned in 2006. This paper reports experience of commissioning and initial operation of the booster.

 
 
TUPMS015 Challenges for the Energy Ramping in a Compact Booster Synchrotron extraction, injection, sextupole, coupling 1212
 
  • S. F. Mikhailov
  • S. M. Hartman, J. Li, V. Popov, Y. K. Wu
    FEL/Duke University, Durham, North Carolina
  Funding: This work is supported by the US DoE grant #DE-FG02-01ER41175

A booster synchrotron has been recently commissioned at Duke University FEL Laboratory as a part of the High Intensity Gamma-ray Source (HIGS) facility. The booster will provide top-off injection into the storage ring in the energy range of 0.27 - 1.2 GeV. In order to minimize the cost of the project, the booster is designed with a very compact footprint. As a result, unconventionally high field bending magnets at 1.76 T are required. A main ramping power supply drives all dipoles and quadrupoles. Quadrupole trims are used to compensate for tune changes caused by the change of relative focusing strength during ramping. Sextupoles compensate for chromatic effects caused by dipole magnet pole saturation. All these compensations have to be performed as a function of beam energy. Above 1.1 GeV, where the magnets are heavily saturated, the reduction of dynamic aperture is compensated by redistribution of strength among the sextupole families. With these compensations, effects of the magnet saturation do not cause any considerable beam loss during energy ramping.

 
 
TUPMS017 Accelerator Physics Research and Light Source Development Programs at Duke University storage-ring, electron, synchrotron, wiggler 1215
 
  • Y. K. Wu
  Funding: This work is supported by the US AFOSR MFEL grant #FA9550-04-01-0086 and by U. S. DoE grant DE-FG05-91ER40665.

The Duke Free-Electron Laser Laboratory (DFELL) has recently completed two major accelerator/light source development projects - we successfully commissioned the world's first distributed optical klystron FEL (DOK-1 FEL) and a new 0.27-1.2 GeV booster synchrotron. The DOK-1 FEL has a much improved FEL gain compared with traditional optical klystrons. This allows the DOK-1 FEL to become a versatile light source for UV-VUV operation and as a driver for a high-intensity Compton gamma-source. The top-off booster injector for the Duke storage ring is part of the upgrade project of High Intensity Gamma-ray Source (HIGS), a facility jointly developed by the DFELL and Triangle Universities Nuclear Laboratory (TUNL). The accelerator and light source development has created new opportunities for the accelerator physics research. In this paper, we will report our recent progress in accelerator and light source development as well as the ongoing accelerator physics research programs to meet the new challenges in the areas of beam dynamics and beam instability.

 
 
TUPMS081 Design considerations of the NSLS-II Injection Linac injection, linac, emittance, single-bunch 1359
 
  • J. Rose
  • I. Pinayev, T. V. Shaftan
    BNL, Upton, Long Island, New York
  The NSLS-II injector consists of a 3 GeV booster injected by a 200MeV linac. Specifications of the linac are derived from Booster and Storage ring beam requirements. Linac design considerations are presented to meet these specifications.  
 
TUPMS083 Conceptual Design of the NSLS-II Injection System injection, lattice, storage-ring, emittance 1362
 
  • T. V. Shaftan
  • J. Beebe-Wang, J. Bengtsson, G. Ganetis, W. Guo, R. Heese, H.-C. Hseuh, E. D. Johnson, V. Litvinenko, A. U. Luccio, W. Meng, S. Ozaki, I. Pinayev, S. Pjerov, D. Raparia, J. Rose, S. Sharma, J. Skaritka, C. Stelmach, N. Tsoupas, D. Wang, L.-H. Yu
    BNL, Upton, Long Island, New York
  Funding: This work was supported by Department of Energy contract DE-AC02-98CH10886.

We present conceptual design of the NSLS-II injection system. The injection system consists of low-energy linac, booster and transport lines. We review the requirements on the injection system imposed by the storage ring design and means of meeting these requirements. We discuss main parameters and layout of the injection system components.

 
 
TUPAN066 Half-mini Beta Optics with a Bunch Rotation for Warm Dense Matter Science Facility in KEK space-charge, target, ion, emittance 1541
 
  • T. Kikuchi
  • S. Kawata
    Utsunomiya University, Utsunomiya
  • K. Takayama
    KEK, Ibaraki
  An all-ion accelerator (AIA) is a quite interesting device as a driver to explore a Warm Dense Matter (WDM) state*. The irradiation onto a target at a small focal spot (< a few mm) with a short pulse duration (< 100 nsec) is required to create an interesting WDM state. The final focus is carried out through a half-mini beta beam line placed after the kickout from the AIA. The half-mini beta beam line should be designed with the space-charge effect due to the high current beam. The design includes effects of a large momentum spread caused by a fast bunch rotation. The beam optics concerned with the effects of space-charge and the large momentum spread during the half-mini beta system is designed for the WDM science in KEK AIA Facility.

* E. Nakamura, et al., "A Modification Plan of the KEK 500MeV Booster to an All-ion Accelerators (An Injector-free Synchrotron)", PAC07.

 
 
TUPAS010 Studies of Beam Properties and Main Injector Loss Control using Collimators in the Fermilab Booster to Main Injector Transfer Line proton, beam-losses, collimation, radiation 1670
 
  • B. C. Brown
  • P. Adamson, D. Capista, D. E. Johnson, I. Kourbanis, D. K. Morris, M.-J. Yang
    Fermilab, Batavia, Illinois
  Funding: Work supported by the U. S. Department of Energy under Contract No. DE-AC02-76CH03000.

High intensity operation of the Fermilab Main Injector has resulted in increased activation of machine components. Efforts to permit operation at high power include creation of collimation systems to localize losses away from locations which require maintenance. As a first step, a collimation system to remove halo from the incoming beam was installed in the Spring 2006 Facility Shutdown*. We report on commissioning studies and operational experience including observations of Booster beam properties, effects on Main Injector loss and activation, and operational results.

* B. C. Brown, et al., "Collimation System for the Fermilab Booster to Main Injector Transfer Line", this conference.

 
 
TUPAS011 Collimation System for the Fermilab Booster to Main Injector Transfer Line collimation, controls, radiation, vacuum 1673
 
  • B. C. Brown
  • D. Capista, I. Kourbanis, N. V. Mokhov, V. Sidorov
    Fermilab, Batavia, Illinois
  Funding: Work supported by the U. S. Department of Energy under Contract No. DE-AC02-76CH03000.

A collimation system has been created for removing proton beam halo in the 8 GeV transfer line from the Fermilab Booster to Main Injector. A pair of 1.14 meter collimators with 5.08 cm rectangular apertures are installed in a 5 meter straight section. Horizontal and vertical motion systems allow them to be positioned such that halo can be scraped from four sides. An additional pair of collimators, placed one cell (90 degrees) downstream scrape halo which is of opposite phase. Each collimator pair can scrape about 600 Watts of beam power, limited by long term activation of materials outside of the beam line tunnel. Personnel exposure is reduced by surrounding the iron absorber with a layer of marble. Design features,radiation calculations and instrumentation considerations will be described.

 
 
TUPAS013 Some Physics Issues of Carbon Stripping Foils injection, proton, electron, ion 1679
 
  • W. Chou
  • M. A. Kostin
    NSCL, East Lansing, Michigan
  • J. R. Lackey, Z. Tang
    Fermilab, Batavia, Illinois
  • R. J. Macek
    LANL, Los Alamos, New Mexico
  • P. S. Yoon
    Rochester University, Rochester, New York
  Funding: Work supported by Universities Research Association, Inc. under contract No. DE-AC02-76CH03000 with the U. S. Dept. of Energy.

Carbon foils are widely used in charge-exchange injection in high intensity hadron accelerators. There are a variety of physics issues associated with the use of carbon foils, including stripping efficiency, energy deposition, foil lifetime (temperature rise, mechanical stress and buckling), multiple Coulomb scattering, large angle single Coulomb scattering, energy straggling and radiation activation. This paper will give a brief discussion of these issues based on the study of the Proton Driver and experience of the Fermilab Booster. Details can be found in Ref*.

* W. Chou et al., "Transport and Injection of 8 GeV H- Ions," Fermilab-TM-2285 (2007).

 
 
TUPAS014 Fast Beam Stacking using RF Barriers injection, simulation, proton, acceleration 1682
 
  • W. Chou
  • D. Capista, E. Griffin, K. Y. Ng, D. Wildman
    Fermilab, Batavia, Illinois
  Funding: Work supported by Universities Research Association, Inc. under contract No. DE-AC02-76CH03000 with the U. S. Dept. of Energy.

Two barrier rf systems were fabricated, tested and installed in the Fermilab Main Injector.* Each can provide 8-10 kV rectangular pulses (the rf barriers) at 90 kHz. When a stationary barrier is combined with a moving barrier, injected beams from the Booster can be continuously deflected, folded and stacked in the Main Injector (MI), which leads to doubling of the beam intensity. This paper gives a report on the beam experiment using this novel technology.

* W. Chou, D. Wildman and A. Takagi, "Induction Barrier RF and Applications in Main Injector," Fermilab-Conf-06-227 (2006).

 
 
TUPAS026 Operation and Performance of the New Fermilab Booster H- Injection System injection, closed-orbit, lattice, optics 1709
 
  • J. R. Lackey
  • F. G. Garcia, M. Popovic, E. Prebys
    Fermilab, Batavia, Illinois
  Funding: Work supported by the U. S. Department of Energy under Contract No. DE-AC02-76CH03000.

The operation and performance of the new, 15 Hz, H- charge exchange injection system for the FNAL Booster is described. The new system installed in 2006 was necessary to allow injection into the Booster at up to 15 Hz. It was built using radiation hardened materials which will allow the Booster to reliably meet the high intensity and repetition rate requirements of the Fermilab's HEP program. The new design uses three orbit bump magnets (Orbmps) rather than the usual four and permits injection into the Booster without a septum magnet. Injection beam line modification and compensation for the quadrupole gradients of the Orbmp magnets is discussed.

 
 
TUPAS028 Upgrades to the Fermilab NuMI Beamline target, proton, antiproton, quadrupole 1712
 
  • M. A. Martens
  • S. C. Childress, N. L. Grossman, P. Hurh, J. Hylen, A. Marchionni, E. McCluskey, C. D. Moore, R. E. Reilly, S. Tariq, A. Wehmann, K. E. Williams, R. M. Zwaska
    Fermilab, Batavia, Illinois
  Funding: Operated by Universities Research Association Inc. under Contract No. DE-AC02-76CH03000 with the United States Department of Energy.

The NuMI beamline at Fermilab has been operational since the spring of 2005 delivering high-intensity neutrino beams to the MINOS experiment. A beam power on target of 310 kW has been achieved and a total of more than 2·1020 protons have been delivered to the NuMI target. Upgrades to NuMI are planned in preparation for the future MINERvA and NOvA neutrino experiments increasing the NuMI beam power capability from 400 kW to 700 kW and then as much as 1.2 MW. An overview of the future upgrade to NuMI is presented.

 
 
TUPAS038 The Concept Design of a New Transfer Line from Booster to Recycler for the Fermilab Proton Plan Phase 2 Campaign injection, emittance, kicker, lattice 1727
 
  • D. E. Johnson
  • M. Xiao
    Fermilab, Batavia, Illinois
  Funding: Work supported by URA under contract No. DEAC02-76CH03000 with the U. S.Dept. of Energy.

Upon the termination of the Fermilab Collider program, the current Recycler anti-proton storage ring will be converted to a proton pre-injector for the Main Injector synchrotron. This is scheduled to increase the beam power for the 120 GeV Neutrino program to upwards of 700KW. A transport line that can provide direct injection from the Booster to the Recycler while preserving direct injection from the Booster into the Main Injector and the 8 GeV Booster Neutrino program will be discussed,and its concept design will be presented.

 
 
TUPAS040 Momentum Spread Reduction at Beam Extraction from the Fermilab Booster at Slipstacking Injection to the Main Injector extraction, injection, synchrotron, emittance 1733
 
  • A. I. Drozhdin
  • W. Pellico, X. Yang
    Fermilab, Batavia, Illinois
  In order to reduce the momentum spread of the beam at extraction from the Booster to the Main Injector with slip stacking injection, the bunch rotation at the end of the cycle is applied. However, the fast RF voltage reduction often causes beam loading issues to Booster RF cavities, and the reliability of extracted beam becomes a problem. An alternative solution is investigated - modulating the RF voltage with twice of the synchrotron frequency introduces bunch length oscillation, and the beam is extracted at the time when the bunch length reaches maximum and the momentum spread becomes minimal.  
 
TUPAS041 Injection Parameters Optimization for the Fermilab Booster injection, space-charge, beam-losses, linac 1736
 
  • A. I. Drozhdin
  • W. Pellico, X. Yang
    Fermilab, Batavia, Illinois
  The maximal capacitance for the Booster to deliver the 8-GeV beam to downstream accelerators is limited by the beam loss. Most of losses happen at injection due to space charge effect being the strongest at the injection energy. Optimizing the RF voltage ramp in the presence of the space charge effect to capture more beam and simultaneously keep small beam emittance has been numerically investigated using 3-D STRUCT code. The results of simulations agree well with the measurements in the machine. Possibilities, such as beam painting and using the second rf harmonic at injection, for further reductions of beam loss in order to reach the maximum beam intensity delivered from the Booster have been investigated.  
 
TUPAS042 Transition Crossing Simulation at the Fermilab Booster space-charge, simulation, emittance, beam-losses 1739
 
  • A. I. Drozhdin
  • W. Pellico, X. Yang
    Fermilab, Batavia, Illinois
  The demand in high intensity and low emittance of the beam extracted from the Booster requires a better control over the momentum spread growth and bunch length shortening at transition, in order to prevent beam loss and coupled bunch instability. Since the transition crossing involves both longitudinal and transverse dynamics, the recently modified 3-D STRUCT code provides an opportunity to numerically investigate different transition schemes in the machine environment, and apply the results of simulation to minimize the beam loss and emittance growth operationally.  
 
TUPAS096 Setup and Performance of the RHIC Injector Accelerators for the 2007 Run with Gold Ions ion, emittance, injection, extraction 1862
 
  • C. J. Gardner
  • L. Ahrens, J. G. Alessi, J. Benjamin, M. Blaskiewicz, J. M. Brennan, K. A. Brown, C. Carlson, W. Fischer, J. Glenn, M. Harvey, T. Hayes, H. Huang, G. J. Marr, J. Morris, F. C. Pilat, T. Roser, F. Severino, K. Smith, D. Steski, P. Thieberger, N. Tsoupas, A. Zaltsman, K. Zeno
    BNL, Upton, Long Island, New York
  Funding: Work performed under the auspices of the US Department of Energy.

Gold ions for the 2007 run of the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL) are accelerated in the Tandem, Booster and AGS prior to injection into RHIC. The setup and performance of this chain of accelerators will be reviewed with a focus on improvements in the quality of beam delivered to RHIC. In particular, more uniform stripping foils between Booster and AGS, and a new bunch merging scheme in AGS promise to provide beam bunches with reduced longitudinal emittance for RHIC.

 
 
TUPAS102 End-to-End Simulation for the EBIS Preinjector ion, rfq, emittance, simulation 1874
 
  • D. Raparia
  • J. G. Alessi, A. Kponou, A. I. Pikin, J. Ritter
    BNL, Upton, Long Island, New York
  • S. Minaev, U. Ratzinger, A. Schempp, R. Tiede
    IAP, Frankfurt am Main
  Funding: This manuscript has been authored by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH1-886 with the U. S. Department of Energy. .

The EBIS (Electron Beam Ion Source) Project at Brookhaven National Laboratory is in the second year of a four-year project. It will replace the Tandem Van de Graaff accelerators with an EBIS, an RFQ, and one IH Linac cavity as the heavy ion preinjector for the Relativistic Heavy Ion Collider (RHIC), and for the NASA Space Radiation Laboratory (NSRL). The preinjector will provide all ions species, He to U, (Q/m>0.16) at 2 MeV/amu at a repetition rate of 5 Hz, pulse length of 10–40 μs, and intensities of ~2.0 mA. End-to-end simulations (from EBIS to the Booster injection) as well as error sensitivity studies will be presented and physics issues will be discussed.

#Raparia@bnl.gov

 
 
WEPMN004 Operation of the SOLEIL RF Systems feedback, injection, controls, cryogenics 2050
 
  • P. Marchand
  • P. Bosland, P. Bredy
    CEA, Gif-sur-Yvette
  • H. D. Dias, M. D. Diop, M. E. El Ajjouri, J. L. Labelle, R. L. Lopes, M. Louvet, C. M. Monnot, F. Ribeiro, T. Ruan, R. Sreedharan, K. Tavakoli, C. G. Thomas-Madec
    SOLEIL, Gif-sur-Yvette
  The 352 MHz RF accelerating systems for the SOLEIL Booster (BO) and Storage Ring (SR) have been commissioned. In the BO, a 5-cell copper cavity of the CERN-LEP type is powered with a 35 kW solid state amplifier. In the SR, the required RF accelerating voltage (up to 4.4 MV) and power (650 kW at full beam current of 500 mA) will be provided by two cryomodules, each containing a pair of superconducting cavities, specifically designed for SOLEIL. The parasitic impedances of the high order modes are strongly attenuated by means of four coaxial couplers, located on the tube connecting the two cavities. The first cryomodule is operational, while the second one, which is being constructed by ACCEL (Germany), will be implemented beginning of 2008. Both cryomodules will be cooled down with liquid helium from a single 350 W liquefier and each cavity is powered with a 190 kW solid state amplifier. With the first cryomodule and two amplifiers in operation, the first year objective of storing 300 mA was successfully achieved. The RF system commissioning and operation results are reported.  
 
WEPMN005 The SSRF Booster Cavity System vacuum, controls, electron, synchrotron 2053
 
  • K. Dunkel
  • B. A. Aminov
    CRE, Wuppertal
  • J. Hottenbacher, C. Piel
    ACCEL, Bergisch Gladbach
  In February 2007 a system consisting out of two 5 cell 500MHz cavities has been delivered to SSRF to accelerate the electrons in their booster ring. The two cavities are controlled by a low level RF system, which forms part of the delivery. The paper will describe the general layout of the booster RF system and the architecture of the low level RF system controlling one amplifier and two cavities. Results of the commissioning phase will be presented and compared with expected and guaranteed values of the system.  
 
WEPMN016 Installation and Commissioning of the New 150 kW Plant for the Elettra RF System Upgrade power-supply, insertion, insertion-device, klystron 2080
 
  • A. Fabris
  • M. Bocciai, C. Pasotti, M. Rinaldi
    ELETTRA, Basovizza, Trieste
  Elettra is the Italian third generation light source in operation in Trieste since 1993. The project of upgrade of the Elettra RF system has become necessary to provide the needed operating margins when all the insertion devices are operational and in view of possible increases in beam current and energy. The first phase of the project regards one of the four plants, which has been upgraded from 60 to 150 kW cw. The power amplifier has been built combining two 80 kW IOTs (inductive output tubes) by means of a switchless combiner. The amplifier and the power plant components have been installed in the second half of year 2006. A coaxial to waveguide transition has been specially designed to interface the coaxial coupler of the cavity to the waveguide power transmission system, taking into account the risks connected to power from the higher order modes excited by the beam in the cavity. After giving an overview of the project, this paper discusses the technical choices adopted, the tests performed during the installation phase and the commissioning of the new system with beam during machine operation.  
 
WEPMN017 RF System for the Elettra New Full Energy Booster Injector storage-ring, linac, synchrotron, extraction 2083
 
  • A. Fabris
  • M. Bocciai, L. Bortolossi, M. Ottobretti, C. Pasotti, M. Rinaldi, M. Svandrlik
    ELETTRA, Basovizza, Trieste
  The Elettra new full energy injector will be based on a 100 MeV linac and a 2.5 GeV booster synchrotron and it will replace the existing 1.2 linac injector. This paper presents the design, construction and the test results of the RF system for the booster synchrotron. The analysis of the foreseen operating scenario is also described. The system must be as simple and reliable as possible, taking into consideration the high availability required for the possible top-up mode of operation. It has also to be consistent with the other upgrades of the facility, as the upgrade of the storage ring RF system. The booster RF system will use a 500 MHz 5-cell copper cavity powered by a 60 kW klystron based power plant. The low level electronics has been in-house developed, starting from the system in operation in the storage ring, increasing the performances and developing the new features required by the use of a five-cell cavity, instead of a single cell one, and by the ramped operation. The commissioning of the new injector is scheduled to start in summer 2007, while the first Elettra operation for users with the new full energy injector is expected for the first quarter of 2008.  
 
WEPMN018 High Precision Measurements of Linac Coupled Cells coupling, linac, proton 2086
 
  • V. G. Vaccaro
  • R. Buiano
    Naples University Federico II and INFN, Napoli
  • A. D'Elia
    CERN, Geneva
  • D. Davino
    Universita' degli Studi del Sannio, Benevento
  • C. De Martinis, D. Giove
    INFN-Milano, Milano
  • M. R. Masullo
    INFN-Napoli, Napoli
  Funding: Istituto Nazionale di Fisica Nucleare, Rome, Italy. Italian Ministry of Research.

For an assembled structure (module, tank) of a Linac, the single cells, when coupled, loose their individuality and in cooperation contribute to the generation of the structure modes (resonant frequencies) Fm. On the other end these modes are the only measurable quantities. The system of the coupled cells can be modelled, in a narrow frequency band, as a lumped constant circuit. The modes are solution of an equation obtained equating to zero the determinant relevant to the lumped circuit. This is an algebraic equation of the same order as the number N of cells. A plausible question can be posed: is it possible from a manipulation of the measurable quantities (Fm) to draw the lumped circuit parameters, namely coupling constants and single cell resonant frequencies? The answer is positive if a certain degree of symmetry is satisfied. The coefficients of above mentioned equation can be easily related to the measured modes Fm. By varying, by means of tuners, the tune of a single cell of a small unknown amount, any couple of equation coefficient moves on a straight line. Therefore, we have N(N-1) known straight line coefficients which may give the unknowns with extremely high accuracy.

 
 
WEPMN083 Design of A Direct Power Converter for High Power RF Applications controls, power-supply, target, radio-frequency 2221
 
  • D. Cook
  • J. Clare, P. W. Wheeler
    University of Nottingham, Nottingham
  • J. S. Przybyla
    e2v, Essex
  This paper presents practical results from a new type of power supply for high power RF applications for CW operation. The converter is a direct topology, utilising a high frequency resonant link and a high frequency transformer. High operating frequency reduces the transformer and filter size. Soft switching is employed to reduce losses. Two variants of this topology are presented. The first incorporates the high frequency transformer into the resonant circuit. The principle feature of this topology is that parasitic elements associated with all transformers are employed in operation of the converter. However, this requires that the circulating current in the resonant tank flows in the transformer windings. The second topology does not incorporate the transformer into the resonant circuit, therefore requires a smaller transformer. However, the topology will be affected by the parasitic elements of the transformer. Advantages of both these topologies over conventional approaches are discussed. The RF power generated by both topologies is stable and predictable, whilst reduced energy storage in filter components removes the need for crowbar circuits.  
 
WEPMN115 Results of the ALS Booster Ring RF System Upgrade for Top-Off Mode of Operation controls, power-supply, vacuum, storage-ring 2307
 
  • K. M. Baptiste
  • P. W. Casey, S. Kwiatkowski, CA. Timossi
    LBNL, Berkeley, California
  Funding: Supported by the U. S. Department of Energy under Contract No. DE-AC03-76SF00098.

ALS, one of the first third generation synchrotron light sources which has been operating since 1992 at Berkeley Lab has been upgraded from its present operation scenario of injecting the 1.5GeV electron beam from the Booster ring into the Storage ring every 8 hours where it is accelerated to the final energy of 1.9GeV to full energy (1.9GeV) injection from the Booster ring into the Storage ring every 3 seconds for filling and every 30-35 seconds for Top-Off mode. Additionally the beam current has been increased from the time averaged value of 250mA to 500mA to increase the brightness. In this paper we will present the results of the new ALS injector RF system set-up for Top-Off mode of operation, the final design and operational results of the Booster RF power source and control system upgrades.

 
 
WEPMS091 Conceptual Design of the NSLS-II RF Systems damping, lattice, wiggler, injection 2550
 
  • J. Rose
  • A. Blednykh, W. Guo, P. Mortazavi, N. A. Towne
    BNL, Upton, Long Island, New York
  RF system requirements are derived from machine parameters and beam stability specifications. The conceptual design of the RF system for NSLS-II to meet these requirements is presented, consisting of 500 MHz superconducting main cavities, 1500 MHz SCRF harmonic cavities for bunch lengthening, and the RF power and cryogenic systems.  
 
THICKI04 Development of STF Cryogenic System in KEK cryogenics, controls, superconducting-RF, vacuum 2701
 
  • J. Yoshida
  • K. Hara, K. Hosoyama, Y. Kojima, H. Nakai, K. Nakanishi
    KEK, Ibaraki
  • T. Ichitani, S. Kaneda
    Taiyo Nippon Sanso Corporation, Kawasaki-city Kanagawa Pref.
  • T. Kanekiyo
    Hitachi Technologies and Services Co., Ltd., Kandatsu, Tsuchiura
  • M. Noguchi
    Mayekawa MFG. Co., Ltd., Moriya
  • S. Sakuma, K. Suzuki
    Taiyo Nippon Sanso Higashikanto Corporation, Hitachi-shi, Ibaraki-Perf.
  Under the leadership of KEK, the collaborating design activity has been performed in KEK in order to develop the STF (Superconducting RF Test Facility) cryogenic system, together with some positive Japanese industrial members. As the first activity of the collaboration, the initial plant of STF cryogenic system with capacity of 30W at 2.0K has been constructed for the testing of STF cryomodule, and been ready for its operation in KEK. In this session, the present status and schedule of STF cryogenic system in KEK shall be briefly reported.  
slides icon Slides  
 
THPMS061 Design of a High-current Injector and Transport Optics for the ILC Electron Source electron, linac, gun, bunching 3127
 
  • F. Zhou
  • Y. K. Batygin, A. Brachmann, J. E. Clendenin, R. H. Miller, J. Sheppard, M. Woodley
    SLAC, Menlo Park, California
  Funding: U. S. DOE Contract DE-AC02-76SF00515

A train of 2-nsμbunches are generated in the DC-gun based injector in the ILC e- source; a bunching system with extremely high bunching efficiency to compress bunch down to 20 ps FWHM is designed. Complete optics to transport the electron beam to the 5-GeV damping ring injection line is developed. Start-to-end multi-particle tracking through the beamline is performed including the bunching system, pre-acceleration, chicane, 5-GeV SC booster linac, spin rotators and energy compressor. It shows more than 95% of electrons from the DC-gun are captured within the 6-D damping ring acceptance at the entrance of damping ring injection line. The field and alignment errors, and orbit correction are analyzed.

 
 
THPAN074 Space-Charge Compensation Options for the LHC Injector Complex electron, resonance, proton, emittance 3390
 
  • F. Zimmermann
  • M. Aiba, M. Chanel, U. Dorda, R. Garoby, J.-P. Koutchouk, M. Martini, E. Metral, Y. Papaphilippou, W. Scandale
    CERN, Geneva
  • G. Franchetti
    GSI, Darmstadt
  • V. D. Shiltsev
    Fermilab, Batavia, Illinois
  Space-charge effects have been identified as the most serious intensity limitation in the CERN PS and PS booster, on the way towards ultimate LHC performance and beyond. We here explore the application of several previously proposed space-compensation methods to the two LHC pre-injector rings, for each scheme discussing its potential benefit, ease of implementation, beam-dynamics risk, and the R&D programme required. The methods considered include tune shift and resonance compensation via octupoles, nonlinear chromaticity, or electron lenses, and beam neutralization by an electron cloud, plasma or negative ions.  
 
THPAN093 Booster Requirements for Advanced Photon Source 1-nm Emittance Upgrade Lattices lattice, injection, emittance, simulation 3438
 
  • N. Sereno
  • M. Borland
    ANL, Argonne, Illinois
  Funding: Work supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357

In recent years, we have explored various upgrade options for the Advanced Photon Source (APS) storage ring that would provide the user community higher brightness. Increased brightness would be accomplished by reducing the emittance of the storage ring as well as increasing the stored beam current from 100 mA to 200 mA. Two upgrade lattices were developed that reduce the effective beam emittance to 1 nm from the present 2.7 nm. These lattices have reduced dynamic aperture compared to the present ring lattice, which may require a reduced emittance booster to minimize injection losses. This paper describes injection tracking simulations that explore how high the booster emittance can be and still have no losses at injection for the 1-nm ring upgrade lattices. An alternative booster lattice is presented with reduced emittance compared to the present booster lattice (65 nm). The proposed low-emittance booster lattice would add pole-face windings to the existing booster dipoles and hence would not require replacement of the existing booster magnets.

 
 
THPAN105 Effects of Space Charge and Magnet Nonlinearities on Beam Dynamics in the Fermilab Booster space-charge, emittance, electron, bunching 3474
 
  • Y. Alexahin
  • A. I. Drozhdin, X. Yang
    Fermilab, Batavia, Illinois
  • N. Yu. Kazarinov
    JINR, Dubna, Moscow Region
  Funding: Work supported by the Universities Research Assoc., Inc., under contract DE-AC02-76CH03000 with the U. S. Dept. of Energy

Presently the Fermilab Booster can accomodate about half the maximum proton beam intensity which the Linac can deliver. One of the limitations is related to large vertical tuneshift produced by space-charge forces at injection energy. In the present report we study the nonlinear beam dynamics in the presence of space charge and magnet imperfections and analyze the possibility of space charge compensation with electron lenses.

 
 
THPAS019 A Beam Dynamics Application Based on the Common Component Architecture simulation, quadrupole, lattice, target 3552
 
  • D. R. Dechow
  • D. T. Abell, P. Stoltz
    Tech-X, Boulder, Colorado
  • J. F. Amundson
    Fermilab, Batavia, Illinois
  • L. Curfman McInnes, B. Norris
    ANL, Argonne, Illinois
  Funding: Department of Engergy, Office of Advanced Scientific Computing Research, SBIR grant: DE-FG02-06ER84520

A component-based beam dynamics application for modeling collective effects in particle accelerators has been developed. The Common Component Architecture (CCA) software infrastructure was used to compose a new Python-steered accelerator simulation from a set of services provided by two separate beam dynamics packages (Synergia and MaryLie/Impact) and two high-performance computer science packages (PETSc and FFTW). The development of the proof-of-concept application was accomplished via the following tasks:

  1. addressing multilanguage interoperability in the MaryLie/Impact code with Babel;
  2. creating components by making the selected software objects adhere to the Common Component Architecture protocol;
  3. assemblying the components with a newly developed, Component Builder gui; and
  4. characterizing the performance of the space charge (Poisson) solver that was originally used in Synergia 1.0 versus the PETSc-based space charge solver that has been developed for Synergia2.
The resulting beam dynamics application will allow the Synergia2 framework to evolve simultaneously with the modeling and simulation requirements of the International Linear Collider. 		 
 
THPAS038 Compensation of the Beam Dynamics Effects Caused by the Extraction Lambertson Septum of the HIGS Booster extraction, septum, injection, coupling 3582
 
  • J. Li
  • S. Huang, S. F. Mikhailov, V. Popov, Y. K. Wu
    FEL/Duke University, Durham, North Carolina
  Funding: Supported by US DoE grant #DE-FG02-01ER41175

As part of the High Intensity Gamma-Ray Source (HIGS) upgrade, the booster synchrotron has been recently commissioned. The booster ramps the electron beam between 0.27 and 1.2 GeV for top-off injection into the Duke storage ring. It has symmetrical injection/extraction schemes with a bumped orbit. The injection/extraction kickers and corresponding septa are located in the opposite straight sections of the booster ring separated by about 1/4 of the vertical betatron wave. Due to the nonideal properties of the magnetic material, the magnetic field leaks out into the stored beam chamber, which directly results in orbit distortion, tune and chromaticity shifts and change of coupling. These effects caused by the extraction septum have been measured as a function of extraction energy. Based upon the measurements, we have developed a scheme to compensate the dynamics effects mentioned above.

 
 
THPAS102 Uniform Beam Distributions at the Target of the NSRL Beam Transfer Line target, ion, octupole, beam-transport 3720
 
  • N. Tsoupas
  • L. Ahrens, K. A. Brown, I.-H. Chiang, C. J. Gardner, W. W. MacKay, P. H. Pile, A. Rusek
    BNL, Upton, Long Island, New York
  Funding: Work supported by the US Department of Energy

Uniform irradiation of biological or material samples with charged particle beams is desired by experimentalist because it reduces radiation-dose-errors which are introduced by a non-uniform irradiation of the samples. In this paper we present results of uniform beams produced in the NASA SPACE RADIATION LABORATORY (NSRL) at the Brookhaven National Laboratory (BNL) by a method which was conceived theoretically and tested experimentally at BNL. This method* of producing uniform beams in the transverse beam direction, is based on purely magnetic focusing of the beam and requires no collimation of the beam or any other type of beam interaction with materials. The method is favorably compared with alternative methods** of producing uniform beam distributions normal to the beam direction and can be applied to the whole energy spectrum of the charged particle beams that are delivered by the Booster synchrotron at BNL.

*Uniform Particle Beam Distribution Produced by Octupole Focusing N. Tsoupas et. al. NSE: 126, 71-79 (1997)
**Review of Ion Beam Therapy: Present and Future J. Alonso LBNL EPAC 2000

 
 
FRZKI02 Neutrino Physics background, proton, target, controls 3835
 
  • T. Kobayashi
  Twenty years have passed after the supernova SN1987A. Before SN1987A, it was often said that neutrino physics was largely an art of learning a great deal by observing nothing. But after SN1987A, the neutrino became a little less mysterious. The solar neutrino deficit which was observed in the Homestake solar neutrino experiment, was confirmed by Kamiokande, Gallex and SAGE. An atmospheric neutrino anomaly was observed in Kamiokande. IMB, MACRO and SUDEN reconfirmed this anpmaly. In 1998 Super-Kamiokande obtained the evidence of atmospheric neutrino oscillations. This was the first discovery of a finite neutrino mass. The atmospheric neutrino oscillations were reconfirmed by K2K. In 2002 SNO detected the evidence of flavor-transformation of solar neutrinos, and KamLAND detected the evidence of reactor antineutrino oscillations. In my talk what we learned from the above neutrino experiments is briefly reviewed, and what we will learn by on-going and proposed neutrino experiments is discussed.  
slides icon Slides  
 
FRPMN021 Investigation of the Injection into the ANKA Storage Ring by a Turn by Turn BPM System injection, kicker, septum, storage-ring 3958
 
  • E. Huttel
  • I. Birkel, A.-S. Muller, P. Wesolowski
    FZK, Karlsruhe
  Modern BPM Electronics allow turn by turn acquisition of the position for both the injected and stored beam. This offers additional opportunities for diagnostics. In addition to the slow acquisition system installed at ANKA, two LIBERA ELECTRON units (www.i-tech.si) have been installed. I. E. the system was used to investigate and optimize the Injection. The stray field of the Septum causes a bump of the stored beam. The settings of the Kicker could be optimized for minimized the orbit distortion. By measuring the phase space of the injected beam the injection efficiency will be improved.  
 
FRPMN023 New Beam Diagnostic Developments at the Photo-Injector Test Facility PITZ diagnostics, dipole, electron, quadrupole 3967
 
  • S. Khodyachykh
  • D. Alesini, L. Ficcadenti
    INFN/LNF, Frascati (Roma)
  • G. Asova, J. W. Baehr, C. H. Boulware, H.-J. Grabosch, M. Hanel, S. A. Korepanov, M. Krasilnikov, S. Lederer, A. Oppelt, B. Petrosyan, S. Rimjaem, J. Roensch, T. A. Scholz, L. Staykov, F. Stephan
    DESY Zeuthen, Zeuthen
  • T. Garvey
    LAL, Orsay
  • L. H. Hakobyan
    YerPhI, Yerevan
  • D. J. Holder, B. D. Muratori
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • R. Richter
    BESSY GmbH, Berlin
  • R. Spesyvtsev
    KhNU, Kharkov
  Funding: This work has partly been supported by the European Community, contracts RII3-CT-2004-506008 and 011935, and by the "Impuls- und Vernetzungsfonds" of the Helmholtz Association, contract VH-FZ-005.

The Photo-Injector Test Facility at DESY in Zeuthen (PITZ) is an electron accelerator which was built to develop and optimize high brightness electron sources suitable for SASE FEL operation. Currently, in parallel to the operation of the existing setup, a large extension of the facility and its research program is ongoing. The beam line which has a present length of about 13 meters will be extended up to about 21 meters within the next two years. Many additional diagnostics components will be added to the present layout. Two high-energy dispersive arms, an RF deflecting cavity and a phase space tomography module will extend the existing diagnostic system of the photo injector and will contribute to the full characterization of new electron sources. We will report on the latest developments of the beam diagnostics at PITZ.

 
 
FRPMN024 Trapped modes analysis for the ELETTRA booster DCCT installation impedance, coupling, vacuum, single-bunch 3970
 
  • P. Craievich
  • C. Bontoiu, G. Ciani, M. Ferianis
    ELETTRA, Basovizza, Trieste
  In the new Elettra full energy injector, bunch charge measurements will be performed by different types of current transformers (CT), depending on their position (single pass or multi pass sections). In the single pass sections (Linac and Transfer lines) a new type of current transformer (in-flange CT by Bergoz) will be used. Main advantage of this device is a compact and reliable design; they are also specially suited in space critical application. For the booster ring a standard DC current transformer will be used to measure the DC component of the circulating beam current. The housing has been developed in house, including the magnetic shield and the ceramic gap in the vacuum chamber. Furthermore, calculations of the trapped modes in the current monitor housing are described. Longitudinal coupling impedance and loss factors for these resonant modes are estimated and we showed that dissipated power is not critical with ELETTRA booster parameters.  
 
FRPMN083 RF Feed-Forward Control Experiments for the 50 MeV Linear Accelerator at TLS controls, klystron, linac, synchrotron 4258
 
  • K. H. Hu
  • K. T. Hsu, J.-Y. Hwang, D. Lee, K.-K. Lin, C. Y. Wu
    NSRRC, Hsinchu
  Performance of an electron linear accelerator is very important for synchrotron light source application. Its performance will decide the reproducibility of filling pattern in the booster synchrotron. The filling pattern of the booster synchrotron will affect filling pattern control of the storage ring. The RF feed-forward control can improve performance of linear accelerator deistically. Design consideration and details of the implementation will be summary in this report.  
 
FRPMS010 Electron Cloud in the Fermilab Booster electron, space-charge, impedance, octupole 3895
 
  • K. Y. Ng
  Simulations reveal a substantial build up of electron cloud in the Fermilab Booster ramping cycle, both inside the unshielded combined-function magnets and the beam pipes joining the magnets. The neutralization can be appreciable depending on the second-emission yield of the magnet pole faces and the beam pipe surfaces. The implication of the electron-cloud effects on the beam emittances and collective instabilities is discussed.  
 
FRPMS030 ALS Mini IOC: An FPGA Embedded Processor Based Control System Module for Booster Magnet Ramping at the ALS controls, power-supply, monitoring, instrumentation 3991
 
  • J. M. Weber
  • M. J. Chin, CA. Timossi, E. C. Williams
    LBNL, Berkeley, California
  Funding: This work was supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U. S. Department of Energy under Contract No. DE-AC02-05CH11231.

The ALS booster magnet upgrade for top off operation requires new instrumentation to meet increased magnet ramping requirements. To address these requirements, the ALS Instrumentation and Controls groups collaborated to design a new control system module called the Mini IOC. The Mini IOC hardware is based on a commercial evaluation board containing an FPGA with embedded processor and built-in interfaces for 128MB of DDR SDRAM and Ethernet. A custom module is used for analog controls and monitors. The PowerPC embedded processor runs an EPICS database built on the VxWorks operating system allowing remote access via Ethernet. This paper includes an overview of the Mini IOC design and operational results.

 
 
FRPMS036 Influence of Chaos on Resonance Crossings space-charge, emittance, resonance, focusing 4021
 
  • C. L. Bohn
  • E. W. Nissen
    Northern Illinois University, DeKalb, Illinois
  Funding: This work is supported by DOE grant DE-FG02-04ER41323.

We undertake a study of particle dynamics in a model fixed-field alternating-gradient (FFAG) synchrotron in which space-charge plays a central role. The space-charge force corresponds to a Gaussian charge distribution in both transverse dimensions. The betatron-tune is linearly ramped through resonance. This ramping alone can cause particles to enter orbits that have chaotic motion.. We found that space-charge can lead to spreading of the available tunes which can either increase or decrease the effects of resonance. By applying recently developed techniques to measure complexity in the orbital dynamics, we also determine whether chaoticity can arise in particle trajectories and subsequently influence resonance crossings. Furthermore, we can see that the chaoticity changes drastically in the area around a resonance crossing.

 
 
FRPMS040 BPM signal conditioning for a wide range of single bunch current operation in Duke storage ring single-bunch, storage-ring, pick-up, synchrotron 4042
 
  • J. Li
  • P. Wang, Y. K. Wu
    FEL/Duke University, Durham, North Carolina
  Funding: Supported by US DoE grant #DE-FG02-01ER41175.

The beam position monitor system of the Duke storage ring has been in operation since 1998. Recently, by injecting at higher energy with a booster synchrotron, the single bunch current threshold is much more increased. This makes the BPM system do not work properly and rises the risk to damaged the BPM signal processing modules. To get reliable orbit data and protect the BPM modules, we carefully studied the BPM signal, and then found a way to overcome this problem. This paper will report the study results and the solution method.

 
 
FRPMS042 Electron Beam Diagnostics for Compact 1.2 GeV Booster Synchrotron synchrotron, diagnostics, linac, storage-ring 4051
 
  • V. Popov
  • M. D. Busch, S. M. Hartman, J. Li, S. F. Mikhailov, P. W. Wallace, P. Wang, Y. K. Wu
    FEL/Duke University, Durham, North Carolina
  • G. Y. Kurkin
    BINP SB RAS, Novosibirsk
  Funding: Supported by US DoE grant #DE-FG02-01ER41175.

First operational experience has been gained with the linac and booster diagnostic system during the commissioning of the booster synchrotron at Duke University. Beam charge measurements are provided by Faraday cups, Integrated Current Transformers (ICT) and Modular Parametric Current Transformer (MPCT). Beam position monitoring is based on BPM system delivered from Bergoz company. Betatron tune measurements use synchrotron radiation (SR) and are different for two modes of operation: stored beam and energy ramping. Transverse profile and temporal beam structure monitoring employ insertable screens, CCD cameras, striplines and dissector. The diagnostics provided good understanding of electron beam behavior and allowed to adjust important beam parameters within design specifications. An overview of the diagnostic instrumentation of the Duke linac and booster synchrotron is given along with measurement examples and discussion of operational experience.

 
 
FRPMS044 A Tune Measurement System for Low Current and Energy Ramping Operation of a Booster Synchrotron synchrotron, electron, betatron, storage-ring 4063
 
  • Y. K. Wu
  • J. Li, S. F. Mikhailov, V. Popov, P. Wang
    FEL/Duke University, Durham, North Carolina
  Funding: This work is supported by the US AFOSR MFEL grant #FA9550-04-01-0086 and by U. S. DOE grant DE-FG05-91ER40665.

The betatron tune measurement system is one of the most important diagnostics for any circular accelerator. During the commissioning of a booster synchrotron newly developed for top-off injection into the Duke storage ring, a versatile tune measurement system employing a photomultiplier tube (PMT) and a space filter has been developed to provide reliable measurements for low current operation at a few micro-amperes of beam-current. Using the turn-by-turn technique, this tune measurement system is being used as a live tune monitor during the booster energy ramping. This system has also be used to measure chromaticity and other important beam parameters. In this paper, we describe the tune measurement system in detail and report our most recent experimental results using this system.