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beam-losses

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OPL01 High Intensity Challenges at the Spallation Neutron Source linac, injection, target, neutron 1
 
  • J. Galambos
    ORNL, Oak Ridge, Tennessee
 
 

The Spallation Neutron Source is designed to produce 1.4 MW of beam power on a mercury target produced in short (1 μSec) pulses at 60 Hz with a 1 GeV beam. Since the initial beam operations in Oct. 2006, the Spallation Neutron Source has operated production runs with beam power up to 520 kW. Apart from equipment issues, the primary challenge in power ramp up is beam loss. Suspected causes of observed beam loss will be discussed. While not contributing to beam loss at present operational parameters, evidence of collective effects is seen at higher intensities, and will be presented. Other issues of interest at high intensity include foil survivability, and maintaining acceptable power density on the neutron production target

 

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WGA09 Simulations of Wire Compensator in RHIC simulation, dynamic-aperture, emittance, multipole 72
 
  • H.J. Kim, T. Sen
    Fermilab, Batavia, Illinois
  • N.P. Abreu, W. Fischer
    BNL, Upton, Long Island, New York
 
 

Beam-beam interaction is one of the dominant sources of emittance growth and luminosity lifetime deterioration. A current carrying wire has been proposed to compensate long-range beam-beam effects in the LHC and the principle is now being experimentally investigated at RHIC. Tune shift, beam transfer function, and beam loss rate are measured in dedicated experiments. In this paper, we do simulations to study the effect of wire compensator based on diffusive apertures, beam loss rates, and beam transfer function using a parallel weak-strong beam simulation code (bbsimc) without parasitic collisions. The simulation results are compared with measurements.

 
WGA16 Instability Observations in the Spallation Neutron Source Accumulator Ring accumulation, neutron, betatron, electron 92
 
  • S.M. Cousineau, V.V. Danilov, C. Deibele, M.A. Plum
    ORNL, Oak Ridge, Tennessee
 
 

The 248 meter Spallation Neutron Source accumulator ring is designed to operate with a beam intensity of 1.5·1014 ppp. A major concern for high intensity operation is the possibility of beam instabilities. Recently a series of experiments have been performed to systematically map out the instability parameter space. Beam instabilities have been measured versus betatron tune, ring RF voltage, lattice chromaticity, and beam intensity. The results of these studies are presented here

 

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WGA18 Recent Observations, Experiments and Simulations of Electron Cloud Effects at the LANL PSR electron, quadrupole, simulation, diagnostics 106
 
  • R.J. Macek, J.S. Kolski, R.C. McCrady, L. Rybarcyk, T. Spickermann, T. Zaugg
    LANL, Los Alamos, New Mexico
  • A. A. Browman
    TechSource, Santa Fe, New Mexico
 
 

Recent beam studies have focused on understanding the main sources and locations of electron clouds (EC) which drive the observed e-p instability at the PSR. New results using a recently developed electron diagnostic will be reported which demonstrate the important role of EC activity in quadrupole magnets, including definitive evidence that ~80% or more of the drift space EC signal is “seeded” by electrons ejected by ExB drifts from adjacent quadrupole magnets*. Other observations include distinctive brown colored tracking in various dipole and quadrupole vacuum chambers, which we hypothesize is caused by energetic electrons striking the wall during beam-induced multipacting. The tracking observations point to a simple and useful signature for regions of EC activity. Modeling of EC observations using a modified version of the POSINST** code shows general agreement on many features of the observations, given the large uncertainties in the distribution of seed electrons from beam loss which is a key input into the simulations. Progress will be reported on resolving the features not in agreement.


* R. Macek et al, PRSTAB, 11, 010101 (2008).
** M. T. F. Pivi and M. A. Furman, PRSTAB, 6, 034201 (2003).

 

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WGA22 The S317 Experiment on High Intensity Beam Loss and Emittance Growth resonance, injection, emittance, sextupole 128
 
  • G. Franchetti, W.B. Bayer, F. Becker, O. Chorniy, P. Forck, T. Giacomini, I. Hofmann, M. Kirk, T.S. Mohite, C. Omet, A.S. Parfenova, P. Schütt
    GSI, Darmstadt
 
 

In the talk we report on an extensive experimental campaign performed at GSI on the SIS18 synchrotron. We measured the evolution of beam properties over 1 second storage of several beams for several working points in the vicinity of a machine resonance. With this data we benchmark our code predictions and test the understanding of the underlying beam degradation mechanisms.

 

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WGA26 High Intensity Effects in the SNS Accumulator Ring scattering, injection, space-charge, simulation 137
 
  • J.A. Holmes, S.M. Cousineau, V.V. Danilov, M.A. Plum, A.P. Shishlo
    ORNL, Oak Ridge, Tennessee
 
 

Operating at 0.5 MW beam power on target, the Spallation Neutron Source (SNS) is already the world's most powerful pulsed neutron source. However, we are only one third of the way to full power. As we ramp toward full power, the control of the beam and beam loss in the ring will be critical. In addition to practical considerations, such as choice of operating point, painting scheme, and rf bunching, it may be necessary to understand and mitigate collective effects due to space charge, impedances, and electron clouds. In dedicated high intensity beam study shifts, we have already observed resistive wall, impedance driven, and electron cloud activity. The analysis and simulation of this data are important ongoing activities at SNS. This talk will discuss the status of this work, as well as other considerations necessary to the successful full power operation of SNS.

 

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WGA29 Achievable Space-Charge Tune Shift with Long Lifetime in the CERN PS and SPS space-charge, injection, emittance, resonance 153
 
  • E. Métral, H. Burkhardt
    CERN, Geneva
 
 

In the CERN Proton Synchrotron (PS), a slow beam loss of few percents is still observed on the long injection flat-bottom with the nominal beam for LHC after fine tuning of the working point. The understanding of space-charge effects is therefore of paramount importance to try and alleviate this limitation. This is why controlled benchmarking space-charge experiments were performed in the last few years. The results are presented in detail with a particular emphasis on the maximum achievable space-charge tune shift with long lifetime. On the contrary, space-charge effects usually play a minor role in high-energy machines like the CERN Super Proton Synchrotron (SPS). However, they could potentially become a limitation for the heavy ion beams needed for the LHC. Therefore, experimental studies on space-charge limitations were also performed in the SPS in the last few years. The results are discussed in detail in the present paper. Furthermore, it is worth mentioning that observations similar to the ones measured in the PS in the presence of space-charge were also measured in the SPS with electron cloud.

 

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WGA31 Linear Resonance Analysis of Beams with Intense Space Charge in the University of Maryland Electron Ring (UMER) space-charge, quadrupole, simulation, resonance 165
 
  • C. Wu, E. Abed, B.L. Beaudoin, S. Bernal, R.A. Kishek, P.G. O'Shea, M. Reiser, D.F. Sutter
    UMD, College Park, Maryland
 
 

Space charge can significantly affect the resonant properties of rings. The University of Maryland Electron Ring is a scaled experiment in which we have circulated beams with unprecedented intensities. Here we discuss the resonance analysis performed using the electrostatic particle-in-cell code WARP, to understand the effect of space charge on the ring resonances. Beams with varying degrees of space charge in both the emittance- and space-charge-dominated regimes are attempted. The operating point is scanned to map the tune diagram under various lattice and injection errors. The results of the simulation study are compared to experimental measurements.

 

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WGB02 Impact Simulation and the SNS Linac Beam linac, simulation, emittance, DTL 190
 
  • Y. Zhang
    ORNL, Oak Ridge, Tennessee
  • J. Qiang
    LBNL, Berkeley, California
 
 

Multi-particle tracking simulations for the SNS linac beam dynamics studies are performed with the IMPACT code. Beam measurement results are compared with the simulations, including beam halos and beam loss in the superconducting linac, measurement of beam transverse twiss parameters and beam longitudinal emittance in the SNS linac. And in most cases, the simulations show good agreement with the measured results.

 
WGB07 Beam Studies at the SNS Linac linac, simulation, cavity, lattice 207
 
  • Y. Zhang
    ORNL, Oak Ridge, Tennessee
 
 

Most recent beam dynamic studies of the Spallation Neutron Source linac, including the major beam loss reduction efforts in the normal conducting (nc) linac and in the superconducting linac (SCL), simulations and measurements of the longitudinal beam halos and the longitudinal acceptance at the entrance of the SCL are discussed. Oscillation of beam centroid around the linac synchronous phase and the beam phase adiabatic damping curves in the SNS linac are investigated with the linac longitudinal models and measured with all the linac beam phase monitors.

 

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WGB17 Development of Large Scale Optimization Tools for Beam Tracking Codes linac, emittance, optics, ion-source 254
 
  • B. Mustapha, P.N. Ostroumov
    ANL, Argonne, Illinois
 
 

Matrix-based beam optics codes such as TRACE-3D are often used for small scale optimizations such as beam matching which involves a limited number of parameters. The limitation of such codes is further amplified for high-intensity and multiple charge state beams as their predictions start to deviate from the more realistic 3D particle tracking codes. For these reasons we have started developing large scale optimization tools for beam tracking codes. The large scale nature comes first from the possibility of optimizing a large number of parameters and second from the minimum number of particles to track especially for space charge dominated beams. The ultimate goal of these developments is not only to optimize the design of an accelerator but also to be able to use a beam dynamics code to operate it once built. A selected set of optimization options will be presented and discussed along with specific applications. We'll also emphasize the need for parallel computing to speed-up the optimization process.

 

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WGC01 Efficiency and Robustness of the PS2 Collimation System collimation, lattice, optics, quadrupole 259
 
  • J. Barranco, Y. Papaphilippou
    CERN, Geneva
  • J. Barranco
    UPC, Barcelona
 
 

A 50 GeV proton synchrotron machine to replace the current PS (PS2) is foreseen in the framework of the LHC complex upgrade. For high intensity beams, losses constitute a great concern in terms of hands-on maintenance and radioactivation. To minimize the uncontrolled losses all around the ring a collimation system is required. Lattice design and collimation studies are carried out in parallel in order to optimize the cleaning efficiency. To this end the robustness of the system is tested for different lattice configurations against orbit errors and optics distortions.

 
WGC02 Comparison of Carbon Stripper Foils Under Operational Conditions at the Los Alamos Proton Storage Ring TRIUMF, scattering, proton, ion 262
 
  • T. Spickermann, M.J. Borden, R.J. Macek
    LANL, Los Alamos, New Mexico
  • C.S. Feigerle
    University of Tennessee, Knoxville, Tennessee
  • v.j. Jaggi, S.K. Zeisler
    TRIUMF, Vancouver
  • R.W. Shaw
    ORNL, Oak Ridge, Tennessee
  • I. Sugai
    KEK, Ibaraki
 
 

At the 39th ICFA Advanced Beam Dynamics Workshop HB 2006 we reported on first results of a test of nanocrystalline diamond foils developed at ORNL under operational conditions at the Los Alamos Proton Storage Ring (PSR). We have continued these tests during the 2006 and 2007 run cycles and have been able to compare the diamond foils with the foils that are normally in use in PSR, which were originally developed by Sugai at KEK. We have gathered valuable information regarding foil lifetime, foil related beam loss and electron emission at the foil. Additional insight was gained under unusual beam conditions where the foils are subjected to higher temperatures. In the 2007 run cycle we also tested a Diamond-like-Carbon foil developed at TRIUMF. A Hybrid-Boron-Carbon foil, also developed by Sugai, is presently in use with the PSR production beam. We will summarize our experience with these different foil types and offer an outlook for future foil activities at PSR.

 
WGC04 SNS Injection and Extraction Systems–Issues and Solutions injection, target, extraction, scattering 268
 
  • M.A. Plum
    ORNL, Oak Ridge, Tennessee
 
 

Beam loss is higher than expected in the Ring injection section and in the injection dump beam line. The primary causes are fairly well understood, and we have made some equipment modifications to reduce the loss. In the ring extraction beam line the beam distribution exhibits cross-plane coupling (tilt), and the cause has been traced to a large skew-quadrupole component in the extraction Lambertson septum magnet. In this talk we will discuss the issues surrounding the ring injection and extraction systems, the solutions we have implemented to date, and our plans for future improvements.

 

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WGC05 Experience with J-PARC RCS Injection and Extraction Systems injection, extraction, septum, closed-orbit 275
 
  • P.K. Saha
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
 
 

The 3 GeV RCS(Rapid Cycling Synchrotron) of J-PARC(Japan Protron Accelerator Research Complex) is already in the beam commissioning stage and as designed working as an injector to the 50-GeV MR(Main Ring) as well as delivering stable beam to the spallation neutron target. The overall design strategy together with beam commissioning results of the injection and extraction will be presented.

 

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WGC10 The Beam Collimator System of J-PARC Rapid Cycling Synchrotron collimation, injection, vacuum, shielding 304
 
  • K. Yamamoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
 
 

A 3GeV Rapid-Cycling Synchrotron (RCS) in Japan Proton Accelerator Research Complex (J-PARC) has been commissioned since September 2007. The most important issue in the beam study is to reduce unnecessary beam loss and to keep the beam line clean for the sake of maintenance and upgrade of the machines. From experience of the former accelerators, the average beam loss should be kept at an order of 1 watt per meter for hands-on maintenance. Since it is very difficult to control the beam loss at such a low level, the only measure we can take is to localize any of the losses in a restricted area, where deliberate modules should be provided for quick coupling and remote handling in order to mitigate the personal doses. Accordingly, we have designed the beam collimation system for the purpose of the beam loss localization. We report the performance of the beam collimation system of RCS through the first commissioning results and the residual doses around RCS components.

 

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WGC12 Beam Preparation for the Injection into CSNS RCS injection, proton, collimation, linac 320
 
  • J. Tang, L. Liu, J. Qiu, G.H. Wei, J. Wei, C. Zhang
    IHEP Beijing, Beijing
 
 

The Rapid Cycling Synchrotron of the China Spallation Neutron Source is a high intensity proton machine, with the accumulated particles of 1.9*1013. The injection by the H- stripping method is performed in one of the four long uninterrupted dispersion-free straight-sections. The phase space painting technique is used for all the three phase planes to alleviate the space charge effects. In order to reduce the beam loss during the injection, the transverse and longitudinal halo of the linac beam is collimated in the Linac Ring Beam Transport line. The transverse beam halo collimation is based on a method of using periodic triplet cells and foil scrapers, which has the advantages of low beam loss in the beam line, deep halo collimation allowing almost no H- particles missing the injection foil, and possible proton applications of the scraped beam halo. A new simulation code SCOMT has also been developed to tackle the transfer, conversion and multiple scattering of the mixed H-, H0 and proton beams in the beam line. The large momentum spread of the linac beam is reduced by a debuncher and the longitudinal beam halo is collimated by a momentum collimator in the bending section.

 

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WGD01 Operation of the High Intensity Proton Beam Facility at PSI cyclotron, target, extraction, proton 329
 
  • G. Seidel
    PSI, Villigen
 
 

The cyclotron based high power proton accelerator facility at PSI drives a neutron spallation source and two Meson production targets with a CW proton beam at 590MeV kinetic energy. This talk concentrates on the operational and technical aspects specific to acceleration and transport of a high power beam. Furthermore a summary on upgrade plans to increase the beam power from presently 1.2MW to 1.8MW will be given.

 

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WGD03 The SNS Power Rampup neutron, linac, injection, collimation 338
 
  • J. Galambos
    ORNL, Oak Ridge, Tennessee
 
 

Since the start of neutron production in October of 2006, the average beam power level has increased from ~ 5 kW to over 500 kW. This increased has been realized by increases in the beam current, pulse length and repetition rate. Equipment issues encountered during this ramp-up will be discussed along with mitigation efforts. A major concern in the power ramp up has been minimization of uncontrolled beam loss. The beam loss levels, loss reduction efforts, and experience levels with residual activation will be discussed. Also the operational run cycles will be discussed, with an evolution in emphasis from beam-studies to neutron production.

 

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WGD05 High Power Operational Experience with the LANSCE Linac linac, DTL, simulation, neutron 348
 
  • L. Rybarcyk
    LANL, Los Alamos, New Mexico
 
 

The heart of the Los Alamos Neutron Science Center (LANSCE) is a pulsed linear accelerator that is used to simultaneously provide H+ and H- beams to several user facilities. This accelerator contains two Cockcroft-Walton style injectors, a 100-MeV drift tube linac and an 800-MeV coupled cavity linac. This presentation will touch on various aspects of the high power operation including performance and limitations, tune-up strategy, beam losses and machine protection.

 

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WGD06 High Intensity Protons in AGS Accelerator complex proton 353
 
  • D. Raparia
    BNL, Upton, Long Island, New York
 
 

AGS have not operated in high intensity mode since 2001, at that time AGS was highest intensity accelerator in the word. Beam loss and residual activation were the main concern for the high intensity operations. This talk will cover beam losses and its limits as set by operational procedures to protect machine and minimize the activations.

 

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WGD10 Residual Dose Rate Analyses for the SNS Accelerator Facility proton, radiation, neutron, target 371
 
  • I.I. Popova, P.D. Ferguson, J. Galambos, F. X. Gallmeier
    ORNL, Oak Ridge, Tennessee
 
 

The Spallation Neutron Source accelerator is a neutron scattering facility for materials research that recently started operations and presently is in the process of power ramp-up to reach mega-watt power level within a year in cycles of operations and maintenance and tuning periods. The structural materials inside the accelerator tunnel are activated by protons beam losses and by secondary particles. Secondary particles appear due to spallation reactions caused by the proton losses, and produce the residual radiation after shut down in the tunnel environment. In order to plan maintenance work after each operations period, residual dose measurements are taking at 30 cm distance from the accelerator structures and on contact. During normal operation, beam losses and beam scenario are recorded and used as a source to calculate expected residual dose rates after shut down. Calculation analyses are performed using the transport code MCNPX followed by the activation calculation script, which uses the nuclear inventory code CINDER’90, then converting gammas production spectra and gamma power to the dose rates. Calculated results for various locations are compared with measured data.

 

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WGD12 The NumI Proton Beam at Fermilab: Successes and Challenges proton, target, extraction, controls 379
 
  • S.C. Childress
    Fermilab, Batavia, Illinois
 
 

The NuMI beam at Fermilab has delivered almost 5x10 20 120 GeV protons to the neutrino production target, since the start for MINOS physics operation in 2005. We will report on beam operation status, including successes and challenges to date with the beam and NuMI system technical components. Also covered will be the ongoing program of increasing NuMI beam power using slip stacking of beam in the Main Injector accelerator.

 

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WGE04 The Superconducting SIS100 Synchrotron for High Intensity Proton and Heavy Ion Beams ion, extraction, dipole, quadrupole 393
 
  • P.J. Spiller
    GSI, Darmstadt
 
 

The double synchrotron complex SIS100 and SIS300 is the central part of the FAIR project. SIS100 is a fast ramped superconducting synchrotron optimized for high intensity, low-charge state heavy ion operation. However, similar to the existing heavy ion synchrotron SIS18, SIS100 will also be used to accelerate all other ion species down to protons, In order to enable such a flexible operation and to avoid transition energy crossing, a triplet structure with three independent power circuits has been chosen. For the low charge state operation, a new lattice design concept has been applied which provides an optimized separation of ionized beam particles. Low charge state operation is enabled by means of the cryopumping of the actively cooled, thin wall vacuum chambers. The stability of the residual gas pressure is an essential precondition for this operation. The project status and the status of the major device developments will be presented.

 
WGE05 Project X Beam Physics Issues linac, injection, synchrotron, emittance 397
 
  • V.A. Lebedev
    Fermilab, Batavia, Illinois
 
 

Fermilab plans to boost the power of Main Injector beam to about 2 MW by building a new SC 8 GeV linac. Its H- beam will be strip injected and accumulated in upgraded Recycler ring, and then transferred to Main Injector for further acceleration to 120 GeV. Beam physics issues related to high intensity operation of Recycler ring and Main Injector are considered.

 
WGE16 The 40 MeV Proton/Deuteron Linac at SARAF linac, ion, rfq, ion-source 438
 
  • D. Berkovits, B. Bazak, G. Feinberg, I. Mardor, A. Nagler, J. Rodnizki, A. Shor, Y. Yanay
    Soreq NRC, Yavne
  • K. Dunkel
    ACCEL, Bergisch Gladbach
 
 

The Soreq Applied Research Accelerator Facility (SARAF) is built to be used for basic research, medical research, neutron based non-destructive testing and radio-pharmaceuticals development and production. The accelerator, designed and constructed by Accel Instruments GmbH, starts with a 5 mA, 20 keV/u ECR ion source. A LEBT transports the beam and matches it to a normal-conducting 4-rod RFQ. The RFQ bunches the beam at a frequency of 176 MHz 4 mA ions and accelerate the ions to 1.5 MeV/u. A 0.65 m long MEBT transports and matches the beam into the superconducting linac. The 20 m long linac is composed of six cryostats that contain a total of 44 half-wave resonators optimized for β0=0.09 and 0.15, which are kept at a temperature of 4.5 K by liquid helium. In order to achieve the dose rate criterion for hands-on maintenance, beam loss is limited to 1 nA/m. Extensive beam dynamics simulations, including error analysis with high statistics, indicate that beam loss will indeed be below the above mentioned criterion. Currently, Phase I of the SARAF linac, including the ion source, LEBT, RFQ, MEBT and the first SC cryostat, is installed on site and is undergoing commissioning.

 

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WGF01 Overview of Beam Instrumentations for High-Power Operation of the Spallation Neutron Source monitoring, instrumentation, neutron, laser 439
 
  • S. Assadi
    ORNL, Oak Ridge, Tennessee
 
 

The Spallation Neutron Source (SNS) has been in commissioning and then operation since 2002. Beam Instruments for full operation and transition to beam powers of 1.0 MW and beyond needs to evolve to mostly non-intrusive, parasitically available and functioning at 30-60 Hz. High power operation necessitates careful monitoring to minimize un-controlled losses. In this paper, we discuss the overview of all diagnostics and present new improvements to, beam loss monitoring system, transverse and longitudinal laser profile monitors, introduction of laser emittance, addition of view screens at various locations and Mid-IR camera to observe electron deposit due to carbon foils at ring injection area. We also present the challenges in the ring instrumentations to have three decades of response and .01% losses.

 

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WGF03 Beam Loss Monitoring Using Proportional Counters at J-PARC radiation, proton, synchrotron, booster 450
 
  • T. Toyama, A. Akiyama, Y. Hashimoto, S. Lee, H. Nakagawa, J.-I. Odagiri, T. Suzuki, M. Tejima, N. Yamamoto
    KEK, Ibaraki
  • N. Hayashi, K. Yamamoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • K. Satou
    J-PARC, KEK&JAEA, Ibaraki-ken
 
 

Proportional counter is adopted as a main beam loss monitor system for the RCS and MR of J-PARC. The advantages are signal amplification and radiation hardness. In our case the signal amplification more than 500 and the radiation hardness of not only component materials but also its sensitivity which keeps constant upto the charge accumulation of 0.0035 C/mm by Co-60 γ-ray source irradiation, corresponds more than several years operation. The rise time is an order of μs which satisfies the requirement of MPS (Machine Protection System). The system will be overviewed and the performance with radiation sources and beams will be reported comparing with the MARS simulation.

 
WGF04 SNS BLM System Overview: Detectors, Measurements, Simulations status, simulation, neutron, hadron 453
 
  • A.P. Zhukov, S. Assadi
    ORNL, Oak Ridge, Tennessee
 
 

SNS is a 1.5 MW hadron beam facility; so the Beam Loss Monitor (BLM) system is a crucial part of MPS and an important tool for beam tuning. We have installed a number of Neutron Detectors (ND), Ionization Chambers and Photo-Multiplier Tubes (PMT) along the SNS beamline. In this paper we present the current status of equipment installed and experimental data obtained during SNS commissioning and operations. We compare several different types of BLMs and show advantages and disadvantages of every type. The losses are simulated by 3-D transport codes (GEANT4, SHIELD) for different loss scenarios and compared with experimental data. Also we discuss equipment issues like part obsolescence and our vision of next generation BLM system.

 

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WGF08 HEBT Diagnostics for Commissioning, Control, and Characterization of the IFMIF-EVEDA Accelerator diagnostics, controls, emittance, beam-transport 459
 
  • I. Podadera Aliseda, B. Brañas, J.M. Carmona, A. Ibarra, C. Oliver
    CIEMAT, Madrid
  • P.-Y. Beauvais, N. Chauvin, J. Marroncle, A. Mosnier
    CEA, Gif-sur-Yvette
 
 

The IFMIF-EVEDA accelerator will be a 9 MeV, 125 mA CW deuteron accelerator which aims to validate the technology that will be used in the future IFMIF accelerator. It is essential then to implement the necessary instrumentation for the commissioning and operation of the accelerator prototype, as well as for a correct characterization of the beam properties. A set of instrumentation will be installed in the last part of the accelerator, at the first section of the High Energy Beam Transport Line (HEBT), between the superconducting HWR and the Beam Dump (BD), in the so-called Diagnostics Plate (DP) to fully characterize the beam properties both from the RFQ and the HWR. In addition, there will be dedicated diagnostics all along the HEBT to transport and control the beam safely down to the BD. Moreover, the closest area to the BD –with high radiation levels and big pipe aperture- can be used for the tests of IFMIF profilers. In this contribution the requirements imposed by the high-intensity deuteron accelerator to the instrumentation along the HEBT, the type of techniques that will be used and a preliminary layout and specifications of the diagnostics in the line will be presented.

 

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WGF10 Beam Diagnostics at ISIS electron, dipole, synchrotron, diagnostics 466
 
  • S.J. Payne, P.G. Barnes, G.M. Cross, A.H. Kershaw, A. Pertica, S.A. Whitehead, M. Wright
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
 
 

ISIS is the spallation neutron source based at the Rutherford Appleton Laboratory in the UK. There are currently 227 individual diagnostic devices distributed between the 70MeV Linac, the 800MeV accelerator ring and the two target beam lines (TS1, TS2). This paper summaries the current state of the ISIS diagnostic systems and describes how the various diagnostics are used to tune the machine, to monitor beam intensity and beam losses and to provide fast machine protection. The limitations and accuracy of the various diagnostic systems (e.g. spatial and energy resolution, sensitivity, speed) are explored along with the steps that are being carried out to tackle any shortcomings. This paper will also briefly look at the new PXI based data acquisition and diagnostic control electronics used on ISIS and the problems encountered in using these systems within radiation environments.

 

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WGF11 Beam Diagnostic System of the Main Ring Synchrotron of J-PARC synchrotron, proton, ion, controls 472
 
  • K. Satou
    J-PARC, KEK&JAEA, Ibaraki-ken
  • D.A. Arakawa, A. Arinaga, Y. Hashimoto, S. Igarashi, M. Tejima
    KEK, Ibaraki
  • N. Hayashi, K. Yamamoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • T. Toyama
    J-PARC, KEK & JAEA, Ibaraki-ken
 
 

The beam commissioning of the J-PARC Main Ring synchrotron (MR) has been started from May of this year. A single bunch beam from 3 GeV Rapid Cycling Synchrotron (RCS) was injected to the ring through 3-50 beam transporting (3-50BT) and then was extracted to the beam dump after 1000 turns (typically) without acceleration. The beam intensity was 4·1011 ppb that is 2 orders of magnitude smaller than that of the design intensity. The beam diagnostic system was used to establish the beam operational parameters. The system includes the instrumentations as follows; 3 types of Current Transformers (CTs), DCCT, fast CT (FCT), and Wall Current Monitor (WCM); Beam Position Monitors (BPMs); proportional counter type Beam Loss Monitors (BLMs) at each quadropole magnet; horizontal and vertical tune monitors with exciter systems; and 3 types of beam profile monitors, Multi Wire Profile Monitors (MWPMs) at 3-50BT and downstream of injection septa, a horizontal Flying Wire Profile Monitor (FWPM) and a vertical residual gas Ionization Profile Monitor (IPM) in the ring. At the workshop, the present status of the system will be presented.

 

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WGF12 NuMI Proton Beam Diagnostics and Control: Achieving 2 Megawatt Capability controls, proton, target, extraction 475
 
  • S.C. Childress
    Fermilab, Batavia, Illinois
 
 

The NuMI proton beam at Fermilab currently delivers 120 GeV protons to the neutrino production target at beam powers up to 320 kW, with design capability to 400 kW. We are preparing for upgrade to 700 kW, and are in planning stage for delivering 2.3 MW beam provided by the Project X accelerator upgrade. We will report on the system of beam diagnostics and control used in operation of the NuMI beam, and the experience to date. Also covered will be the steps to provide a robust system for transport and targeting beam of 2 MW and beyond.

 

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Slides

 
CPL02 Summary Report of the Working Group B: Beam Dynamics in High Intensity Linacs linac, simulation, rfq, focusing 485
 
  • A.V. Aleksandrov
    ORNL, Oak Ridge, Tennessee
  • I. Hofmann
    GSI, Darmstadt
  • J.-M. Lagniel
    GANIL, Caen
 
 

The focus of the Working group B was to discuss the following questions:

  1. Summarize the state of the art in linac simulation capabilities. What are the weaknesses? What developments are needed?
  2. Summarize recent developments in benchmarking experimental data with simulations. What critical experiments are needed to further refine the theory and simulations?
  3. Summarize the present understanding and limitations of linac beam dynamics in operating linacs.
  4. Summarize the primary limitations to beam intensity in existing high-intensity linear accelerators.
  5. Summarize the key open questions in the beam dynamics of high-intensity linacs and opportunities to advance the field.
There were 9 invited talks, 4 contributed talks and 2 posters, covering the above topics roughly uniformly, followed by 2 discussion sessions.

 

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Slides

 
CPL04 Commissioning Strategies, Operations and Performance, Beam Loss Management, Activation, Machine Protection booster, linac, target, radiation 489
 
  • J. Galambos
    ORNL, Oak Ridge, Tennessee
  • T. Koseki
    KEK, Ibaraki
 
 

The working group D covered

  1. commissioning aspects of new high power machines,
  2. operational aspects of existing high power machines, and
  3. comparison of modeling and measurements of residual activation buildup.
During discussions in this working group different institutes shared experiences, which are summarized here.

 

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Slides

 
CPL06 Closing Plenary Summary of Working Group F: Diagnostics and Instrumentation for High-Intensity Beams monitoring, instrumentation, diagnostics, controls 496
 
  • M. Wendt
    Fermilab, Batavia, Illinois
  • T. Toyama
    KEK, Ibaraki
 
 

Working group F was charged with presentations and discussions on diagnostics and instrumentation of highintensity beams. We had 3 sessions spanning a total time of 330 minutes, in which 13 talks were presented. The presentation time for each talk had to be limited to 15-20 min., in order to allow sufficient time (5-10 min.) for some discussion. This turned out quite well, even though some presentations went longer, not every topic required the anticipated discussion time.
A final discussion session of 110 minutes was held as joint session with working group D (operations).

 

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Slides