Keyword: monitoring
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MOP037 Muon Ionization Cooling Experiment: Controls and Monitoring controls, EPICS, emittance, target 166
 
  • P.M. Hanlet
    IIT, Chicago, Illinois, USA
 
  Funding: NSF
The Muon Ionization Cooling Experiment (MICE) is a demonstration experiment to prove the viability of cooling a beam of muons for use in a Neutrino Factory and Muon Collider. The MICE cooling channel is a section of a modified Study II cooling channel which will provide a 10% reduction in beam emittance. In order to ensure a reliable measurement, we intend to measure the beam emittance before and after the cooling channel at the level of 1%, or an absolute measurement of 0.001. This renders MICE as a precision experiment which requires strict controls and monitoring of all experimental parameters in order to control systematic errors. The MICE Controls and Monitoring system is based on EPICS and integrates with the DAQ, detector, environment, and data monitoring systems. A description of this system, its implementation, and performance during recent muon beam data collection will be discussed.
 
 
MOP093 Precision Monitoring of Relative Beam Intensity proton, target, background, dipole 271
 
  • N.J. Evans, S.E. Kopp
    The University of Texas at Austin, Austin, Texas, USA
  • E. Prebys
    Fermilab, Batavia, USA
 
  Funding: U.S. Department of Energy.
For future experiments at the intensity frontier, precise and accurate knowledge of beam time structure will be critical to understanding backgrounds. The proposed Mu2e experiment will utilize ~150nsec (FWHM) bunches of 107 protons at 8 GeV with a bunch-to-bunch period of 1.7 microseconds. The out-of-bunch beam must be suppressed by a factor of 10-9 relative to in-bunch beam and continuously monitored. I propose a Cerenkov based particle telescope to measure secondary production from beam interactions in a several tens of microns thick foil. Correlating timing information with beam passage allows the determination of relative beam intensity to arbitrary precision given a sufficiently long integration time. The goal is to verify out-of-bunch extinction to the level 10-6 in the span of several seconds. This allows near real-time monitoring of the initial extinction of the beam slow extracted from Fermilab's Debuncher before a system of AC dipoles and collimators, which will provide the final extinction. The effect on beam emittance is minimal, allowing the necessary continuous measurement. I will present the detector design and results of a test in Fermilab's MI-12 beamline.
 
 
MOP094 Development of Advanced Beam Halo Diagnostics at the Jefferson Lab Free-Electron-Laser Facility electron, FEL, laser, radiation 274
 
  • S. Zhang, S.V. Benson, D. Douglas, F.G. Wilson
    JLAB, Newport News, Virginia, USA
  • R.B. Fiorito, A.G. Shkvarunets, H.D. Zhang
    UMD, College Park, Maryland, USA
 
  Funding: Many colleagues at JLab FEL provided help with the installation of the present experimental setup. This work is partially supported by DOE Contract DE-AC05-060R23171.
High average current and high brightness electron beams are needed for many applications. At the Jefferson Lab FEL facility, the search for dark matter with the FEL laser beam has produced interesting results*, and a second very promising method for dark matter search using JLab Energy-recovery-linac (ERL) machine has been put forward**. Although the required beam current has been achieved on this machine, one key challenge is the management of beam halo. UMD has demonstrated a high dynamic range halo measurement method using a digital micro-mirror array device. A similar system has been established at JLab FEL facility as a joint effort by UMD and JLab to measure the beam halo on the high current ERL machine***. The experiment and characterization are being performed while the new UV FEL is running for optimization. In this paper, the limitations of the current system will be analyzed and study of other approaches (such as an optimized coronagraph) for further extending measuring dynamic range will be presented. In particular, we will discuss in detail the possibility of performing both longitudinal and transverse (3D) halo measurement altogether on one single system.
* A. Afanasev, et al., PRL. 101 120401 (2008).
** J. Thale, Searching for a New Gauge Boson at JLab, Newport News, VA, September 20-21, 2010
*** H. Zhang, et al., this conference.
 
 
MOP166 Comissioning of a BPM system for the LNLS Booster to Storage Ring Transfer Line injection, booster, controls, storage-ring 405
 
  • F.H. Cardoso, S.R. Marques, X.R. Resende
    LNLS, Campinas, Brazil
 
  In order to increase the number of diagnostics and make possible studies of beam position effects in the injection efficiency, a beam position monitoring system was designed to equip the BTS (booster to storage ring) transfer line employing the long striplines BPMs. The log-ratio technique was applied using a commercial electronics module (LR-BPM) from Bergoz Instrumentation. Currently the system is integrated to the LNLS control system, database and ready to be used routinely during the injections. This work describes the system topology, details about the hardware and software, bench tests and measurements performed with electron beam. Future plans to improve the injection efficiency will also be presented.  
 
MOP190 Precision, Absolute Proton Beam Polarization Measurements at 200 MeV Beam proton, scattering, polarization, target 444
 
  • G. Atoian, A. Zelenski
    BNL, Upton, Long Island, New York, USA
  • A. Bogdanov, M.F. Runtso
    MEPhI, Moscow, Russia
  • E.J. Stephenson
    IUCF, Bloomington, Indiana, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
A new polarimeter for absolute proton beam polarization measurements at 200 MeV to accuracy better than ±0.5% has been developed as a part of the RHIC polarized source upgrade. The polarimeter is based on the elastic proton-carbon scattering at 16.2 degree angle, where the analyzing power is close to 100% and was measured with high accuracy. The elastically and in-elastically scattered protons are clearly identified by the difference in the propagation through variable copper absorber and energy deposition of the protons in the detectors. The 16.2 degree elastic scattering polarimeter was used for calibration of a high rate inclusive 12 degree polarimeter for the on-line polarization tuning and monitoring. This technique can be used for accurate polarization measurements in energy range of at least 160-250 MeV.
 
 
MOP202 Simulations of the LHC High Luminosity Monitors at Beam Energies 3.5 TeV to 7.0 TeV luminosity, simulation, instrumentation, interaction-region 471
 
  • H.S. Matis, P. Humphreys, A. Ratti, W.C. Turner
    LBNL, Berkeley, California, USA
  • R. Miyamoto
    BNL, Upton, Long Island, New York, USA
  • J. Stiller
    Heidelberg University, Heidelberg, Germany
 
  Funding: This work partially supported by the US Department of Energy through the US LHC Accelerator Research Program (LARP).
We have constructed two pairs of fast ionization chambers (BRAN) for measurement and optimization of luminosity at IR1 and IR5 of the LHC. These devices are capable of monitoring the performance of the LHC at low luminosity 1028 cm-2s−1 during beam commissioning all the way up to the expected full luminosity of 1034 cm-2s−1 at 7.0 TeV. The ionization chambers measure the intensity of hadronic/electromagnetic showers produced by the forward neutral particles of LHC collisions. To predict and improve the understanding of the BRAN performance, we created a detailed FLUKA model of the detector and its surroundings. In this paper, we describe the model and the results of our simulations including the detector’s estimated response to pp collisions at beam energies of 3.5, 5.0, and 7.0 TeV per beam. In addition, these simulations show the sensitivity of the BRAN to the crossing angle of the two LHC beams. It is shown that the BRAN sensitivity to crossing angle is proportional to the measurement of crossing angle by the LHC beam position monitors.
 
 
MOP207 Diamond X-ray Beam Position Monitors diagnostics, undulator, photon, insertion 483
 
  • J. Smedley, A. Heroux, J.W. Keister
    BNL, Upton, Long Island, New York, USA
  • K. Attenkofer
    ANL, Argonne, USA
  • J. Bohon
    Case Western Reserve University, Center for Synchrotron Biosciences, Upton, New York, USA
  • J. Distel
    LANL, Los Alamos, New Mexico, USA
  • M. Gaowei
    SBU, Stony Brook, New York, USA
  • E.M. Muller
    Stony Brook University, Stony Brook, USA
 
  Funding: The authors wish to acknowledge the support of the U.S. Department of Energy (DOE) under grant DE-FG02-08ER41547.
Modern synchrotrons are capable of significant per-pulse x-ray flux, and time resolved pulse-probe experiments have become feasible. These experiments provide unique demands on x-ray monitors, as the beam position, flux and arrival time all potentially need to be recorded for each x-ray pulse. Further, monitoring of “white” x-ray beam position and flux upstream of beamline optics is desirable as a diagnostic of the electron source. We report on a diamond quadrant monitors which provide beam monitoring for a variety of applications, for both white and monochromatic beams. These monitors have a position resolution of 20 nm for a stable beam, are linear in flux over at least 11 orders of magnitude, and can resolve beam motion shot-by-shot at repetition rates up to 6.5 MHz.
 
 
MOP208 Baseline Suppression Problems for High Precision Measurements Using Optical Beam Profile Monitors. background, controls, brightness, radiation 486
 
  • P. Thieberger, D.M. Gassner, J.W. Glenn, M.G. Minty, C.M. Zimmer
    BNL, Upton, Long Island, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The use of fluorescent screens for beam profile monitors provides a simple and widely used way to obtain detailed two dimensional intensity maps. For high precision measurements many possible error contributions need to be considered that have to do with properties of the fluorescent screens and of the CCDs. Saturation effects, reflections within and outside the screen, non-linearities, radiation damage, etc are often mentioned. Here we concentrate on an error source less commonly described, namely erroneous baseline subtraction, which is particularly important when fitting projected images. We show computer simulations as well as measurement results having remarkable sensitivity of the fitted profile widths to even partial suppression of the profile baseline data, which often arises from large pixel-to-pixel variations at low intensity levels. Such inadvertent baseline data suppression is very easy to miss as it is usually not obvious when inspecting projected profiles. In this report we illustrate this effect and discuss possible algorithms to automate the detection of this problem as well as some possible corrective measures.
 
 
MOP220 The Feasibility of Near-Field ODR Beam-Size Monitoring at 23 GeV at FACET polarization, simulation, radiation, booster 513
 
  • A.H. Lumpkin
    Fermilab, Batavia, USA
  • M.J. Hogan
    SLAC, Menlo Park, California, USA
  • P. Muggli
    USC, Los Angeles, California, USA
  • C. Yao
    ANL, Argonne, USA
 
  Funding: Work partially supported by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy
Extension of near-field optical diffraction radiation (ODR) imaging to the 23 GeV beams at the proposed FACET facility at SLAC has been evaluated. The beam- size sensitivity at the 10- to 20- μm σ level based on a simple model will be reported. Polarization effects are also seen to be important and will be discussed. The comparisons to previous experimental results and the modeling results indicate sufficient feasibility for planning of the experiments in the coming year.
 
 
MOP231 Absolute Beam Flux Measurement at NDCX-I Using Gold-Melting-Calorimetry Technique ion, heavy-ion, brightness, laser 540
 
  • P.N. Ni, F.M. Bieniosek, S.M. Lidia
    LBNL, Berkeley, California, USA
  • J.R. Welch
    Cornell University, Ithaca, New York, USA
 
  Funding: Supported by the U.S. Department of Energy under Contracts No. DE-AC02-05CH11231 and DE-AC52-07NA27344.
We report on an alternative way to measure beam fluence at NDCX-I, which is necessary for numerical simulation and planning of warm-dense-matter (WDM) experiments. So far the NDCX-I beam fluence has been characterized using a fast Faraday cup, radiation from a scintillator and tungsten foil calorimeter techniques. The present beam intensity is sufficient to melt and partially evaporate a 150 nm thick gold foil. Thermal emission (function of temperature) of the gold foil in the visible spectrum was measured during beam irradiation. A distinct shelf in the thermal emission intensity was observed after 600 ns, indicating that the sample reached the melting temperature. Using known heat capacity and latent heat of melting, the beam flux fully determines the duration of the melting shelf and the moment it appears. Using this technique we estimate an average 260 kW/cm2 beam flux over 10μs, which is consistent with values provided by the other methods.
 
 
MOP232 LANSCE-R Wire-Scanner Analog Frontend Electronics (AFE) shielding, controls, coupling, electromagnetic-fields 542
 
  • M.E. Gruchalla
    URS, Albuquerque, New Mexico, USA
  • P. Chacon, J.D. Gilpatrick, D. Martinez, J.D. Sedillo
    LANL, Los Alamos, New Mexico, USA
 
  Funding: U.S. Department of Energy.
A new AFE is being developed for the new LANSCE-R wire-scanner systems. The new AFE is implemented in a National Instruments cRIO module installed a BiRa 4U BiRIO cRIO chassis specifically designed to accommodate the cRIO crate and all the wire-scanner interface, control and motor-drive electronics. A single AFE module provides interface to both X and Y wire sensors using true DC coupled transimpedance amplifiers providing collection of the wire charge signals, real-time wire integrity verification using the normal data-acquisition system, and wire bias of 0V to ±50V. The AFE system is designed to accommodate comparatively long macropulses (>1ms) with high PRF (>120Hz) without the need to provide timing signals. The basic AFE bandwidth is flat from true DC to 50kHz with a true first-order pole at 50kHz. Numeric integration in the cRIO FPGA provides real-time pulse-to-pulse numeric integration of the AFE signal to compute the total charge collected in each macropulse. This method of charge collection eliminates the need to provide synchronization signals to the wire-scanner AFE while providing the capability to accurately record the charge from long macropulses at high PRF.
 
 
MOP234 Beam Position and Phase Monitors for the LANSCE Linac linac, controls, neutron, instrumentation 548
 
  • R.C. McCrady, J.D. Gilpatrick, J.F. Power
    LANL, Los Alamos, New Mexico, USA
 
  Funding: This work is supported by the US Department of Energy under contract DE-AC52-06NA25396
New beam-position and phase monitors are under development for the linac at the Los Alamos Neutron Science Center. Transducers have been designed and are being fabricated. We are considering many options for the electronic instrumentation to process the signals and provide position and phase data with the necessary precision and flexibility to serve the various required functions. We’ll present the requirements of the system and the various options under consideration for instrumentation along with the advantages and shortcomings of these options.
 
 
MOP250 NSLS-II High Level Application Infrastructure and Client API Design EPICS, controls, quadrupole, emittance 582
 
  • G. Shen, K. Shroff, L. Yang
    BNL, Upton, Long Island, New York, USA
 
  Funding: Work performed under auspices of the U.S. Department of Energy under Contract No. DE-AC02-98CH10886 with Brookhaven Science Associates, LLC.
The beam commissioning software framework of NSLS-II project adopts a client/server based architecture to replace the more traditional monolithic high level application approach. It is an open structure platform, and we try to provide a narrow API set for client application. With this narrow API, existing applications developed in different language under different architecture could be ported to our platform with small modification. This paper describes a detailed client API design, and latest progress.
 
 
MOP267 Fast BPM Data Distribution for Global Orbit Feedback Using Commercial Gigabit Ethernet Technology feedback, HOM, status, collider 606
 
  • R.L. Hulsart, P. Cerniglia, R.J. Michnoff, M.G. Minty
    BNL, Upton, Long Island, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
In order to correct beam perturbations in RHIC around 10Hz, a new fast data distribution network was required to deliver BPM position data at rates several orders of magnitude above the capability of the existing system. The urgency of the project limited the amount of custom hardware that could be developed, which dictated the use of as much commercially available equipment as possible. The selected architecture uses a custom hardware interface to the existing RHIC BPM electronics together with commercially available Gigabit Ethernet switches to distribute position data to devices located around the collider ring. Using the minimum Ethernet packet size and a field programmable gate array (FPGA) based state machine logic instead of a software based driver, real-time and deterministic data delivery is possible using Ethernet. The method of adapting this protocol for low latency data delivery, bench testing of Ethernet hardware, and the logic to construct Ethernet packets using FPGA hardware will be discussed.
 
 
MOP272 Radiation Dose Level in the SSRF during Normal Operation radiation, neutron, storage-ring, injection 615
 
  • X.J. Xu, P. Fei, R. Qin, W. Shen, X. Xia, D. Zhang, J.Z. Zhou
    SINAP, Shanghai, People's Republic of China
 
  Shanghai Synchrotron Radiation Facility (SSRF) has been commissioned since December 2007, and has been formally operated since May 2009. In order to ensure the radiation safety for staff members and publics, the radiation levels of the workplace, the environment and the staff are monitored through a real-time network of gamma and neutron monitors as well as through TLD passive dosimeters. This paper reports the results of the radiation monitoring. From these results, we found that the annual dose equivalents were good to meet the management values of SSRF.  
 
MOP283 A Hardware Overview of the RHIC LLRF Platform site, LLRF, controls, status 645
 
  • T. Hayes, K.S. Smith
    BNL, Upton, Long Island, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The RHIC LLRF platform is a flexible, modular system designed around a carrier board with six XMC daughter sites. The carrier board features a Xilinx FPGA with an embedded, hard core Power PC that is remotely reconfigurable. It serves as a front end computer (FEC) that interfaces with the RHIC control system. The carrier provides high speed serial data paths to each daughter site and between daughter sites as well as four generic external fiber optic links. It also distributes low noise clocks and serial data links to all daughter sites and monitors temperature, voltage and current. To date, two XMC cards have been designed: a four channel high speed ADC and a four channel high speed DAC.
 
 
MOP292 Universal FMC-Compliant Module for xTCA Systems controls, power-supply, impedance, target 663
 
  • D.R. Makowski, G.W. Jabłoński, T. Kozak, A. Mielczarek, A. Napieralski
    TUL-DMCS, Łódź, Poland
 
  Funding: The research leading to these results has received funding from Polish National Science Council Grant 642/N-TESLAXFEL/09/2010/0.
The Advanced Telecommunications Computing Architecture (ATCA), MicroTCA (uTCA) and Advanced Mezzanine Card (AMC) standards, known as xTCA, provide unique features desired by various control systems of particle accelerators. The standards provide availability and operability as high as 99.999 %. A significant number of additional features must be implemented to take a full advantage of xTCA standards and gain the required availability. On the other hand, many control systems require various data acquisition and control modules with different number of input analogue and digital inputs or outputs as defined by their respective system specifications. The paper presents an universal base module, designed according to the AMC standard with an FPGA Mezzanine Card connector, that can be used for fast development of input-output subsystems. The module consists of two submodules. The digital part is designed according to the AMC standard while the main input-output functionality is realized by the FPGA Mezzanine Card part. The FMC submodule provides the functionality required by the specification of the LLRF system.
 
 
MOP296 Embedded System Architecture and Capabilities of the RHIC LLRF Platform controls, LLRF, feedback, low-level-rf 672
 
  • F. Severino, M. Harvey, T. Hayes, L.T. Hoff, R.C. Lee, A. Marusic, P. Oddo, K.S. Smith, K.L. Unger
    BNL, Upton, Long Island, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
A high performance FPGA based platform has been developed for the RHIC Low Level RF system upgrade, and is now replacing our aging VME based systems. This new platform employs a sophisticated embedded architecture to implement its core functionality. This architecture provides a control system interface, manages remote access to all configuration parameters and diagnostic data, supports communication between all system components, enables real time application specific processing, monitors system health, etc. This paper will describe the embedded architecture and its capabilities, with emphasis on its application at RHIC.
 
 
MOP300 The Spallation Neutron Source Eight-Channel Pulsed Power Meter EPICS, controls, klystron, LLRF 684
 
  • M.T. Crofford, X. Geng, T.W. Hardek
    ORNL, Oak Ridge, Tennessee, USA
  • T.L. Davidson
    ORNL RAD, Oak Ridge, Tennessee, USA
 
  The Spallation Neutron Source (SNS) Low Level Radio Frequency (LLRF) Control System currently utilizes the High-Power Protection Module (HPM) to monitor RF power levels, arc faults, and associated signals for the protection of the RF systems and accelerating cavities. The HPM is limited to seven RF channels for monitoring signals which in some instances leaves some signals of interest unmonitored. In addition, the HPM does not support monitoring of RF frequencies below 100 MHz which makes it unusable for our Ring and Ion Source systems that operate at 1 and 2 MHz respectively. To alleviate this problem, we have developed a microprocessor based eight channel pulsed RF power meter that allows us to monitor additional channels between the frequency range of 1 MHz to 2.5 GHz. This meter has been field tested in several locations with good results and plans are in place for a wider deployment.  
 
TUP080 Tests of a Tuner for a 325 MHz SRF Spoke Resonator cavity, controls, resonance, SRF 973
 
  • Y.M. Pischalnikov, E. Borissov, T.N. Khabiboulline, R.L. Madrak, R.V. Pilipenko, L. Ristori, W. Schappert
    Fermilab, Batavia, USA
 
  Funding: Work is supported by the U.S. Department of Energy
Fermilab is developing 325 MHz SRF spoke cavities for the proposed ProjectX. A compact fast/slow tuner has been developed to compensate microphonics and Lorentz force detuning. The modified tuner design and results of 4K tests of the first prototype are presented.
 
 
TUP114 Rugged Solid-state RF Amplifiers for Accelerator Applications - Design and Performance from an Industry Perspective controls, rf-amplifier, status, target 1053
 
  • S.C. Dillon, B.S. Nobel, J.L. Reid, C.P. Schach, W.J. Villena Gonzales
    Tomco Technologies, Stepney, South Australia, Australia
 
  Recent advances in transistor technology are making solid-state RF amplifiers an increasingly viable alternative to tube systems in accelerator applications. This paper details the development and performance of a range of new high power amplifiers, based on current MOSFET technology, and designed specifically for this application. A generic modular architecture that can be used to construct high power CW amplifier systems operating from HF up to S-band, is detailed. Key design considerations in terms of modularity, redundancy, reliability and cost are discussed.  
 
TUP134 New High Power Test Facility for VHF Power Amplifiers at LANSCE power-supply, controls, DTL, status 1088
 
  • J.T.M. Lyles, S. Archuletta, J. Davis, L. Lopez, D. Rees, M.R. Rodriguez, G. M. Sandoval, Jr., A. Steck, D.J. Vigil
    LANL, Los Alamos, New Mexico, USA
  • D. Baca, R.E. Bratton, R.D. Summers
    Compa Industries, Inc., Los Alamos, New Mexico, USA
  • N.W. Brennan
    Texas A&M University, College Station, Texas, USA
 
  Funding: Work supported by the United States Department of Energy, National Nuclear Security Agency, under contract DE-AC52-06NA25396
A new test facility was designed and constructed at Los Alamos Neutron Science Center (LANSCE) for testing the Thales TH628 Diacrode® and TH781 tetrode power amplifiers. Anode power requirements for the TH628 are 28 kV DC, with peak currents of 190 Amperes in long pulses. A new 225 uF capacitor bank supplies this demand. A charging power supply was obtained by re-configuring a 2 MW beam power supply remaining from another project. A traditional ignitron crowbar was designed to rapidly discharge the 88 kJ stored energy. The anode power supply was extensively tested using a pulsed tetrode switch and resistor load. A new Fast Protect and Monitor System (FPMS) was designed to take samples of RF reflected power, anode HV, and various tube currents, with outputs to quench the HV charging supply, remove RF drive and disable the conduction bias pulse to the grid of each tube during fault events. The entire test stand is controlled with a programmable logic controller, for normal startup sequencing and timing, protection against loss of cooling, and operator GUI.
 
 
TUP181 A Monitoring System for CSR Power Supply power-supply, ion, heavy-ion, target 1169
 
  • W. Zhang, S. An, S. Gou, W.M. Qiao, Y.P. Wang, F. Yang, Y.J. Yuan
    IMP, Lanzhou, People's Republic of China
 
  This article elaborated the monitoring system which has applied in the CSR power supply. This system is composed of the hardware and the software. The hardware is composed of PS6040-PXI-18 PXI engine case +PXI-3800 the master controller +PXI-6133 the ADC card. The software uses NI Corporation's LABVIEW to carry on the data demonstration and the analysis. This monitoring system in the CSR debugging, in the acceptance and the running has played the influential role. At the same time, it provided the data for the physical person. This monitoring system has run four years in the CSR.  
 
TUP255 Solid-State Transmitter for a 2 MW Klystron controls, klystron, cathode, high-voltage 1304
 
  • M.K. Kempkes, M.P.J. Gaudreau, T.H. Hawkey, K. Schrock
    Diversified Technologies, Inc., Bedford, Massachusetts, USA
 
  Diversified Technologies, Inc. delivered a transmitter for a 2 MW, 500 MHz klystron manufactured by Communications and Power Industries, Inc. The transmitter design eliminates the need for a large pulse transformer; eliminates the crowbar for greater system availability and klystron reliability, and provides full control and monitoring of critical transmitter functions, settings, and fault diagnostics. The klystron beam power is generated by two high voltage power supplies, each capable of producing 150 kW CW power at 100 kV, with ~0.1% regulation. The transmitter can operate at lower average power in the unlikely event a single power supply goes off-line. The main solid-state switch, a series stack of commercially available IGBTs, delivers a range of HV pulsewidths to the klystron under normal operating conditions, and protects the klystron against arc damage. Should the current in the switch exceed a preset fault threshold value, the switch opens in ~ 1 μs to disconnect the high voltage from the klystron. In this paper, DTI will describe the architecture of the 2 MW klystron transmitter and its present status.  
 
TUP267 LANSCE Drift Tube Linac Water Control System Refurbishment controls, EPICS, linac, drift-tube-linac 1319
 
  • P.S. Marroquin, J.D. Bernardin, J.G. Gioia, J.A. Ortiz
    LANL, Los Alamos, New Mexico, USA
 
  Funding: Funding Agency: Work performed under the auspices of the U.S. Department of Energy, under contract DE-AC52-06NA25396.
There are several refurbishment projects underway at the Los Alamos National Laboratory LANSCE linear accelerator. Systems involved are: RF, water cooling, networks, diagnostics, timing, controls, etc. The Drift Tube Linac (DTL) portion of the accelerator consists of four DTL tanks, each with three independent water control systems. The systems are about 40 years old, use outdated and non-replaceable equipment and NIM bin control modules, are beyond their design life and provide unstable temperature control. Insufficient instrumentation and documentation further complicate efforts at maintaining system performance. Detailed design of the replacement cooling systems is currently in progress. Previous design experience on the SNS accelerator water cooling systems will be leveraged. Plans call for replacement of water piping, manifolds, pumps, valves, mix tanks, instrumentation (flow, pressure and temperature) and control system hardware and software. This presentation will focus on the control system design with specific attention on planned use of the National Instruments Compact RIO platform with the Experimental Physics and Industrial Control System (EPICS) software toolkit.
 
 
TUP275 SNS Linac Modulator Operational History and Performance linac, neutron, high-voltage, klystron 1340
 
  • V.V. Peplov, D.E. Anderson, R.I. Cutler, M. Wezensky
    ORNL, Oak Ridge, Tennessee, USA
  • J.D. Hicks, R.B. Saethre
    ORNL RAD, Oak Ridge, Tennessee, USA
 
  Fourteen High Voltage Converter Modulators (HVCM) were initially installed at the Spallation Neutron Source Linear Accelerator (SNS Linac) at the Oak Ridge National Laboratory in 2005. A fifteenth HVCM was added in 2009. Each modulator provides a pulse of up to 140 kV at a maximum width of 1.35 msec. Peak power level is 11 MW with an 8% duty factor. The HVCM system must be available for neutron production (NP) 24/7 with the exception being two, 6-week maintenance periods per year. HVCM reliability is one of the most important factors to maximize Linac availability and achieve SNS performance goals. During the last few years several modifications have been implemented to improve the overall system reliability. This paper presents operational history of the HVCM systems and examines failure mode statistical data since the modulators began operating at 60 Hz. System enhancements and upgrades aimed at providing long term reliable operation with minimal down time are also discussed in the paper.  
 
WEOBN4 Multipurpose Controller Based on a FPGA with EPICS Integration controls, EPICS, LLRF, low-level-rf 1407
 
  • P. Echevarria, I. Arredondo, N. Garmendia, H. Hassanzadegan, L. Muguira
    ESS Bilbao, Bilbao, Spain
  • D. Belver, M. del Campo
    ESS-Bilbao, Zamudio, Spain
  • V. Etxebarria, J. Jugo
    University of the Basque Country, Faculty of Science and Technology, Bilbao, Spain
 
  In this work a multipurpose configurable control system is presented. This controller is based on a high performance FPGA for a fast control connected to a Host PC which works as an EPICS server to allow a remote control. The communication between both parts is made by a register bank implemented in the FPGA and which is accessible by the Host PC by means of a Compact PCI bus. The initialization values, the numeric representation of the digital signals and the EPICS database are configured by an XML file. This control scheme has been prototyped for two applications: Low Level RF and Beam Position Monitoring. The former contains three digital loops to control the amplitude and phase of the RF supply and the geometry of the cavity. The latter processes the information from four capacitive buttons to calculate the position of the beam. In both systems, the necessary parameters for the digital processing of the acquired signals (using fast ADCs) and intermediate calculations are stored in the register bank connected to the cPCI bus. These systems are being developed for the ESS-Bilbao facility which will be built in Bilbao, Spain.  
slides icon Slides WEOBN4 [0.621 MB]  
 
THP012 Development of Imaging Techniques for Medical Accelerators in the QUASAR Group antiproton, ion, target, electron 2160
 
  • C.P. Welsch, T. Cybulski
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • R. Boll, S. Sellner, S. Tegami
    MPI-K, Heidelberg, Germany
  • M. Holzscheiter
    UNM, Albuquerque, New Mexico, USA
  • C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
 
  Funding: Work supported by the EU under contract PIIF-GA-2009-234814, PITN-GA-2008-215080 and DFG under WE3565/5.
Ions offer an increased precision in radiotherapy due to their specific depth-dose properties. This precision can only be fully exploited if exact knowledge of the particle beam properties, as well as the exact range of the particles in the inhomogeneous target, is available. The QUASAR Group has addressed the key issues in a number of different ways: Using a monolithic active pixel sensor, designed for dead time-free operation, we have developed a beam monitoring system capable of monitoring pulsed and continuous beams at typical therapeutic energies and intensities in real time during patient treatment; using a non-intrusive detector system based on the VELO detector, we will measure variations in beam properties without intersecting the beam core altogether; using liquid ionization chambers, we aim at obtaining information on the biological quality of the beam; using a simple set-up based on a silicon pixel detector, developed for the ALICE experiment, we have demonstrated the feasibility of detecting the distal edge of the Bragg peak in antiproton beams by detecting the pions resulting from pbar-nucleon annihilations. This paper gives an overview of these studies.
 
 
THP054 Medium Energy Heavy Ion Operations at RHIC luminosity, emittance, ion, heavy-ion 2220
 
  • K.A. Drees, L. A. Ahrens, M. Bai, J. Beebe-Wang, I. Blackler, M. Blaskiewicz, J.M. Brennan, K.A. Brown, D. Bruno, J.J. Butler, C. Carlson, R. Connolly, T. D'Ottavio, W. Fischer, W. Fu, D.M. Gassner, M. Harvey, T. Hayes, H. Huang, R.L. Hulsart, P.F. Ingrassia, N.A. Kling, M. Lafky, J.S. Laster, R.C. Lee, V. Litvinenko, Y. Luo, W.W. MacKay, M. Mapes, G.J. Marr, A. Marusic, K. Mernick, R.J. Michnoff, M.G. Minty, C. Montag, J. Morris, C. Naylor, S. Nemesure, F.C. Pilat, V. Ptitsyn, G. Robert-Demolaize, T. Roser, P. Sampson, T. Satogata, V. Schoefer, C. Schultheiss, F. Severino, T.C. Shrey, K.S. Smith, S. Tepikian, P. Thieberger, D. Trbojevic, N. Tsoupas, J.E. Tuozzolo, M. Wilinski, A. Zaltsman, K. Zeno, S.Y. Zhang
    BNL, Upton, Long Island, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
As part of the search for a phase transition or critical point on the QCD phase diagram, an energy scan including 5 different energy settings was performed during the 2010 RHIC heavy ion run. While the top beam energy for heavy ions is at 100 GeV/n and the lowest achieved energy setpoint was significantly below RHICs injection energy of approximately 10 GeV/n, we also provided beams for data taking in a medium energy range above injection energy and below top beam energy. This paper reviews RHIC experience and challenges for RHIC medium energy operations that produced full experimental data sets at beam energies of 31.2 GeV/n and 19.5 GeV/n.
 
 
THP060 RHIC 12x150A Current Lead Temperature Controller: Design and Implementation controls, power-supply, target, cryogenics 2238
 
  • C. Mi, D. Bruno, N.M. Day, A. Di Lieto, G. Ganetis, K. Hamdi, G. Heppner, J.P. Jamilkowski, W. Louie, J. Sandberg, S.K. Seberg, C. Sirio, J.E. Tuozzolo, K.L. Unger
    BNL, Upton, Long Island, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy
There are 60 12×150A current leads distributed in 6 RHIC service buildings; each current lead delivers power supply current from room temperature to cryogenic temperature in RHIC. Due to the humid environment, condensation frequently occurs and ice was quickly formed during operation, especially during an extensive storage period. This condition generated warnings and alarms that personal had to respond to, in order to provide temporary solutions, to keep the machine operational. A temperature control system was designed to avoid such occasions. We will discuss design, implementation and some results of this design in this paper.