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MOOAKI01 | Plans for Utilizing the Cornell Electron Storage Ring as a Test Accelerator for ILC Damping Ring Research and Development | emittance, wiggler, damping, electron | 42 | |||||
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Funding: Funding provided by NSF grant PHY-0202078 |
In April 2008, we propose to begin operation of the Cornell Electron Storage Ring (CESR) as a test accelerator, CesrTA, for International Linear Collider (ILC) damping ring research. Utilizing 12 damping wigglers, the baseline CesrTA lattice at 2.0 GeV will offer a natural geometric emittance of 2.25 nm. An experimental program has been laid out which focuses on several key areas of damping rings R&D. First we will test vacuum chamber designs to suppress electron cloud growth in the wiggler magnets. Secondly, we will develop correction, tuning and emittance monitoring strategies to achieve vertical emittances of a few picometers. As part of this effort we will validate alignment and survey techniques being developed by the Linear Collider Alignment and Survey group (LiCAS) for curved tunnel applications. After achieving ultra-low emittance, we intend to explore the impact of the electron cloud, the fast ion instability and other beam dynamics effects on ultra-low emittance beams. Finally, we plan to test various technical systems required for the ILC damping rings. This paper provides an update on conceptual design issues for CesrTA and describes the experimental program in detail. |
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MOPAN068 | Performance with Lead Ions of the LHC Beam Dump System | ion, proton, extraction, kicker | 308 | |||||
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The LHC beam dump system must function safely with lead ions. The differences with respect to the LHC proton beams are briefly recalled, and the possible areas for performance concerns discussed, in particular the various beam intercepting devices and the beam instrumentation. Energy deposition simulation results for the most critical elements are presented, and the conclusions drawn for the lead ion operation. The expected performance of the beam instrumentation systems are reviewed in the context of the damage potential of the ion beam and the required functionality of the various safety and post-operational analysis requirements.
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MOPAN072 | High-precision Performance Testing of the LHC Power Converters | controls, factory, monitoring, collider | 320 | |||||
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The magnet power converters for LHC were procured in three parts, power part, current transducers and control electronics, to enable a maximum of industrial participation in the manufacturing and still guarantee the very high precision (a few parts in 10-6) required by LHC. One consequence of this approach was several stages of system tests: factory reception tests, CERN reception tests, integration tests, short-circuit tests and commissioning on the final load in the LHC tunnel. The majority of the power converters for LHC have now been delivered, integrated into complete converters and high-precision performance testing is well advanced. This paper presents the techniques used for high-precision testing and the results obtained. It is also hoped to report results from the first sector commissioning.
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MOPAN099 | Integrated Mechanism of Online Monitor and Archive System | controls, monitoring, synchrotron, synchrotron-radiation | 392 | |||||
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In the accelerator field, the instrumentation monitor system provides the machine online status to view, control and alert. A novel shared data engine developed by Labview provides the distributed PCs, PDAs, embedded devices, and local controllers to exchange data mutually via Ethernet or wireless Ethernet. The mechanism guarantees delivery with an additional function layer of the raw UDP protocol and usees less network bandwidth than TCP/IP. The system's main function is to introduce a platform with reliable online information about the status of the instrumentation. The users can access data with graphic view and trend view by some complementary software. Also, the users can easily take the online data via binding monitor tags without programming. The mechanism benefits all system maintenance, operation, management and analysis.
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MOPAN102 | SMS Alert System at NSRRC | controls, monitoring, site | 401 | |||||
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SMS (Short Message Service) technology has been used extensively today in the wireless world. The Utility Group at NSRRC has developed an SMS alert and notification system with LabVIEW programming language to continuously monitor the critical signals of its utility systems. A short message will be sent immediately to the responsible people in case of critical components failure. Many critical signals in the Instrumentation Division have also been included in this system for monitoring. Since its implementation the maintenance people have been notified many times to restore the faulty system to prevent accelerator from being shutdown or to minimize the damage. The detailed methodology used will be presented here.
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MOPAS022 | Controls, LLRF, and Instrumentation Systems for ILC Test Facilities at Fermilab | controls, linac, single-bunch, klystron | 479 | |||||
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Funding: Work supported by the U. S. Department of Energy under contract No. DE-AC02-76CH03000. |
The major controls and instrumentation systems for the ILC test areas and the NML test accelerator at Fermilab are discussed. The test areas include 3 separate areas for Vertical Superconducting RF Cavity Testing, Horizontal Cavity Testing, and NML RF and beam test area. A common control infrastructure for the test areas including a controls framework, electronic logbook and cavity database will be provided, while supporting components supplied by collaborators with diverse areas of expertise (EPICS, DOOCS, LabVIEW, and Matlab). The discussions on the instrumentation systems are focused on overview and requirements. |
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MOPAS031 | Hardware and Software Development and Integration in an FPGA Embedded Processor Based Control System Module for the ALS | controls, booster, feedback, power-supply | 503 | |||||
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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. |
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MOPAS032 | Advanced Accelerator Control and Instrumentation Modules based on FPGA | controls, target | 506 | |||||
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Funding: Work supported by U. S. DOE Office of Science, Office of High Energy Physics, under grant DE-FG02-06ER84486. |
Field Programmable Gate Arrays (FPGAs) offer a powerful alternative to ASICs or general purpose processors in accelerator control applications. Software development for these devices can be awkward and time consuming, however, when using low level hardware design languages. To facilitate the use of FPGAs in control systems we are developing a library of software tools based on ImpulseC, a high level subset of the C language specifically designed for FPGA programming. Development and testing of the software will be performed on a Xilinx Virtex-4 FPGA demo board. We will present timing benchmarks for common control functions (PID feedback loops, FIR and Kalman filters) and present plans for the development of a controller for the Argonne Wakefield Accelerator high current photoinjector based on this work. |
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MOPAS043 | Instrumentation for the Cornell ERL Injector Test Cryostats | controls, cryogenics, vacuum, monitoring | 527 | |||||
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Funding: Work is supported by the National Science Foundation grant PHY 0131508 |
Cornell is building a 1.3 GHz Injector Cryomodule for an ERL prototype. The cryomodule consists of five two-cell niobium cavities each cavity having two coaxial power input couplers. Cavity and coupler pairs will require acceptance testing at high power prior to assembly in the injector cryomodule. A liquid nitrogen cryostat for testing the couplers at high power has been built and the first input coupler test is complete. In addition, a Horizontal Test Cryostat (HTC) is being built to test input coupler pairs and cavities as a set. The first HTC test is scheduled for spring 2007. Details for instrumentation of the Coupler Test Cryostat (CTC) and HTC are presented. |
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MOPAS052 | The LANSCE Control System Current State and Upgrade Outlook | controls, linac, diagnostics, monitoring | 554 | |||||
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The LANSCE (Los Alamos Neutron Science Center) runs its LINAC control system based on 30(+) year old technology. While some peripheral upgrades have been made over the years, the control system will need some major improvements over the next five years in order to continue to support the user facility's mission. The proposed multi-million dollar LANSCE-R (Refurbishment) project creates a unique opportunity to upgrade the existing control system. We intend to use the EPICS (Experimental Physics and Industrial Control System) control system with the following goals for effective control at modest cost: (1) Replacing our VMS basedμVAX's; (2) Replacing the RICE (Remote Instrumentation and Control Equipment) subsystem with Programmable Logic Controllers (PLCs) to handle regular data acquisition and control, and custom hardware to handle "flavored" data acquisition; (3) Replacing the Master Timer subsystem with a modern event system; (4) Converting Fortran programs running on VAX/VMS computers to Java Programs running on Linux-based desktop PCs. The boundary condition, as usual, is that we must implement these major changes on a running accelerator.
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TUOAKI01 | Status of the NuMI Neutrino Beam at Fermilab | target, proton | 691 | |||||
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The NuMI beam at Fermilab produces a high-intensity neutrino beam for neutrino oscillation experiments. Since the start of 2005, NuMI has been delivering beam to the MINOS experiment. Greater than 2x10[20] 120 GeV protons have been delivered to the neutrino production target, with a peak power of 320 kW being achieved. This note reports on the status and operation of the beam and its technical components, including the target, horns, and instrumentation.
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TUOAKI02 | CERN Neutrinos to Gran Sasso (CNGS): Results from Commissioning | proton, target, extraction, optics | 692 | |||||
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The CNGS project (CERN Neutrinos to Gran Sasso) aims at directly detecting muon neutrinos-tau neutrinos oscillations. An intense muon- neutrinos beam is generated at CERN and directed towards LNGS (Laboratori Nazionali del Gran Sasso) in Italy where tau-neutrinos will be detected in large and complex detectors. An overview of the CNGS beam facility is given. Results from the primary and secondary beam line commissioning performed in summer 2006 are presented. Measurements are compared with expectations.
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TUPAN098 | Beam Commissioning of the SPS LSS6 Extraction and TT60 for LHC | extraction, kicker, controls, septum | 1610 | |||||
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The new fast extraction system in LSS6 of the SPS and the first 100 m of transfer line TT60 was commissioned with low intensity beam in late 2006. The layout and functionality of the main elements are briefly explained, including the various hardware subsystems and the control system. The systems safety procedures, test objectives and measurements performed during the beam commissioning are described.
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WEPMN105 | Fast Thermometry for Superconducting RF Cavity Testing | superconducting-RF, kaon, radio-frequency, higher-order-mode | 2280 | |||||
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Funding: Work supported by Universities Research Association Inc. under Contract No. DE-AC02-76CH03000 with the United States Department of Energy. |
Fast readout of strategically placed low heat capacity thermometry can provide valuable information of Superconducting RF (SRF) cavity performance. Such a system has proven very effective for the development and testing of new cavity designs. Recently, several RTDs were installed in key regions of interest on a new 9 cell 3.9 GHz SRF cavity with integrated HOM design at FNAL. A data acquisition system was developed to read out these sensors with enough time and temperature resolution to measure temperature changes on the cavity due to heat generated from multipacting or quenching within power pulses. The design and performance of this fast thermometry system will be discussed along with results from tests of the 9 cell 3.9GHz SRF cavity. |
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WEPMN107 | RF and Data Acquisition Systems for Fermilab's ILC SRF Cavity Vertical Test Stand | controls, radiation, shielding, pick-up | 2286 | |||||
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Funding: Operated by Universities Research Association, Inc. for the U. S. Department of Energy under contract DE-AC02-76CH03000 |
Fermilab is developing a facility for vertical testing of SRF cavities as part of a program to improve cavity performance reproducibility for the ILC. The RF system for this facility, using the classic combination of oscillator, phase detector/mixer, and loop amplifier to detect the resonant cavity frequency and lock onto the cavity, is based on the proven production cavity test systems used at Jefferson Lab for CEBAF and SNS cavity testing. The design approach is modular in nature, using commercial-off-the-shelf (COTS) components. This yields a system that can be easily debugged and modified, and with ready availability of spares. Data acquisition and control is provided by a PXI-based hardware platform in conjunction with software developed in the LabView programming environment. This software provides for amplitude and phase adjustment of incident RF power, and measures all relevant cavity power levels, cavity thermal environment parameters, as well as field emission-produced radiation. It also calculates the various cavity performance parameters and their associated errors. Performance during system commissioning and initial cavity tests will be presented. |
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WEPMN108 | A Technique for Monitoring Fast Tuner Piezoactuator Preload Forces for Superconducting RF Cavities | monitoring, resonance, controls, simulation | 2289 | |||||
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Funding: Work supported by Universities Research Association Inc. under Contract No. DE-AC02-76CH03000 with the United States Department of Energy. |
The technology for mechanically compensating Lorentz Force detuning in superconducting RF cavities has already been developed at DESY. One technique is based on commercial piezoelectric actuators and was successfully demonstrated on TESLA cavities*. Piezo actuators for fast tuners can operate in a frequency range up to several kHz; however, it is very important to maintain a constant preload force on the piezo stack in the range of 10 to 50% of its specified blocking force. Determining the preload force during cooldown, warm-up, or re-tuning of the cavity is difficult without instrumentation, and exceeding the specified range can permanently damage the piezo stack. A technique based on strain gauge technology for superconducting magnets has been applied to fast tuners for monitoring the preload on the piezoelectric assembly. This paper will address the design and testing of piezo actuator preload sensor technology. Results from measurements of preload sensors installed on the tuner of the DESY Capture Cavity II tested at Fermilab will be presented. These results include measurements during cooldown, warm-up, and cavity tuning along with dynamic Lorentz force compensation.
* M. Liepe et al," Dynamic Lorentz Force Compensation with a Fast Piezoelectric Tuner" PAC2001 |
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THOAC02 | OTR Imaging of Intense 120 GeV Protons in the NuMI Beamline at FNAL | proton, target, radiation, antiproton | 2639 | |||||
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Funding: Work Supported by the U. S. Department of Energy under Contract No. DE-AC02-CH03000 and Contract No. DE-AC02-06CH11357. |
An Optical Transition Radiation (OTR) detector has been installed in the Fermilab NuMI proton beamline, which operates at beam powers of up to ~300 kW, to obtain real-time, spill-by-spill beam profiles for neutrino production. A series of Optical Transition Radiation (OTR) detectors were design, constructed and installed in various beamlines at Fermilab and previous near-field OTR images of lower-intensity 120 GeV and 150 GeV protons with larger transverse beam size have been presented at BIW06 and IEEE NSS06. NuMI OTR images of 120 GeV protons for beam intensities up to 2.8·1013 at a spill rate of 0.5 Hz and small transverse beam size of ~1 mm (σ) are presented here. The NuMI OTR detector uses a 6 micron Kapton foil with 0.12 micron of aluminum which reduces beam scatter by 70% compared to an adjacent Secondary Emission Monitor (SEM). Beam profiles are extracted from the OTR images and compared to the adjacent SEM. The OTR detector provides two-dimensional beam shape such as ellipticity and tilt, as well as complementary beam centroid and beam intensity information. In addition, response of the OTR detector over different intensities and transverse positions is presented. |
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THOBC01 | Status of Various SNS Diagnostic Systems | target, beam-losses, diagnostics, pick-up | 2658 | |||||
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Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U. S. Department of Energy under contract DE-AC05-00OR22725 |
The Spallation Neutron Source (SNS) accelerator systems are ramping up to deliver a 1.0 GeV, 1.4 MW proton beam to a liquid mercury target for neutron scattering research. Enhancements or additions have been made to several diagnostics instruments to support the ramp up in intensity, improve reliability, and/or add functionality. The Beam Current Monitors now support increased rep rates, the Harp system now includes charge density calculations for the target, and a new system has been created to collect data for the beam accounting and present the data over the web and to the operator consoles. Many of the instruments are PC-based and a way to manage their instrument configuration files through the Oracle database has been implemented. A new version for the wire scanner software has been developed and is under test. This paper also includes data from the various instruments. |
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FRPMN068 | The 4.8 GHz LHC Schottky Pick-up System | pick-up, impedance, emittance, single-bunch | 4174 | |||||
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Funding: LARP |
The LHC Schottky observation system is based on traveling wave type high sensitivity pickup structures operating at 4.8 GHz. The choice of the structure and operating frequency is driven by the demanding LHC impedance requirements, where very low impedance is required below 2 GHz, and good sensitivity at the selected band at 4.8 GHz. A sophisticated filtering and triple down-mixing signal processing chain has been designed and implemented in order to achieve the specified 100 dB instantaneous dynamic range without range switching. Detailed design aspects for the complete systems and test results without beam are presented and discussed. |
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FRPMN116 | Status of the RF BPM Upgrade at the Advanced Photon Source | storage-ring, controls, feedback, power-supply | 4390 | |||||
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Funding: Work supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. |
The Advanced Photon Source (APS), a third-generation synchrotron light source, has been in operation for twelve years. The monopulse radio frequency (rf) beam position monitor (BPM) is one of three BPM types now employed in the storage ring at the APS. It is a broadband (10 MHz) system designed to measure single-turn and multi-turn beam positions, but it suffers from an aging data acquisition system. The replacement BPM system retains the existing monopulse receivers and replaces the data acquisition system with high-speed analog-to-digital converters (ADCs) and a field-programmable gate array (FPGA) that performs the signal processing. A first article system has been constructed and is currently being evaluated. This paper presents the results of testing of the first article system as well as the progress made in other areas of this upgrade effort. |
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FRPMS020 | Optical Beam Timing Monitor Experiments at the Advanced Light Source | laser, storage-ring, diagnostics, pick-up | 3952 | |||||
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Funding: Work supported by the U. S. Department of Energy under Contract No. DE-AC0-05CH11231. |
We present the results of an experimental study of a beam timing monitor based on a technique demonstrated by Loehl*. This technique uses the electrical signal from a beam position monitor to amplitude-modulate a train of laser pulses, converting timing jitter into an amplitude jitter. This modulation is then measured with a photodetector and sampled by a fast ADC. This approach has already demonstrated sub-100 fsec resolution and promises even better results. Our study focuses on the use of this technique for precision timing for storage rings. We show results of measurements using signals from the Advanced Light Source.
* F. Loehl, et al., Proc. of the 2006 EPAC., p. 2781. |
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FRPMS030 | ALS Mini IOC: An FPGA Embedded Processor Based Control System Module for Booster Magnet Ramping at the ALS | booster, controls, power-supply, monitoring | 3991 | |||||
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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. |
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FRPMS051 | Proposed Beam Diagnostics Instrumentation for the LANSCE Refurbishment Project | linac, simulation, bunching, beam-losses | 4099 | |||||
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Funding: *Work supported by the U. S. Department of Energy. |
Presently, the Los Alamos National Laboratory is in the process of planning a refurbishment of various sub-systems within its Los Alamos Neutron Science Center accelerator facility. A part of this LANSCE facility refurbishment will include some replacement of and improvement to existing older beam diagnostics instrumentation. While plans are still being discussed, some instrumentation that is under improvement or replacement consideration are beam phase and position measurements within the 805-MHz side-coupled cavity linac, slower wire profile measurements, typically known as wire scanners, and possibly additional installation of fast ionization-chamber loss monitors. This paper will briefly describe the requirements for these beam measurements, what we have done thus far to answer these requirements, and some of the technical issues related to the implementation of these instrumentation. |
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