Keyword: LLRF
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MOP203 RHIC Spin Flipper AC Dipole Controller dipole, feedback, controls, heavy-ion 474
 
  • P. Oddo, M. Bai, W.C. Dawson, D.M. Gassner, M. Harvey, T. Hayes, K. Mernick, M.G. Minty, T. Roser, F. Severino, K.S. Smith
    BNL, Upton, Long Island, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under contract DE-AC02-98CH10886 with the U.S. Department of Energy and RIKEN, Japan.
The RHIC Spin Flipper's five high-Q AC dipoles which are driven by a swept frequency waveform require precise control of phase and amplitude during the sweep. This control is achieved using FPGA based feedback controllers. Multiple feedback loops are used to control and dynamically tune the magnets. The current implementation and results will be presented.
 
 
MOP279 Synchronize Lasers to LCLS e- Beam laser, controls, electron, cavity 636
 
  • G. Huang
    TUB, Beijing, People's Republic of China
  • J.M. Byrd, L.R. Doolittle, R.B. Wilcox
    LBNL, Berkeley, California, USA
 
  Fiber based synchronization system is used in LCLS to synchronize the laser for pump probe experiment to average electron beam arrival time. Electron bunch arrival time measured by phase cavity is one of the best measurement for FEL X pulse until now. The average bunch arrival time is transmitted through electronic length stabilized fiber link to AMO and other experiment hall. The laser oscillator is phase locked to this reference signal to maintain low jitter and drift between pump and probe. The in loop error shows the jitter is less then 100 fs and meets the experiment requirement.  
 
MOP282 A Deterministic, Gigabit Serial Timing, Synchronization and Data Link for the RHIC LLRF controls, site, diagnostics, target 642
 
  • T. Hayes, F. Severino, 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.
A critical capability of the new RHIC low level rf system is the ability to synchronize signals across multiple locations. The Update Link provides this functionality. The Update Link is a deterministic serial data link based on the Xilinx Aurora protocol that is broadcast over fiber optic cable at 1 gigabit per second. The link provides timing events and data packets as well as time stamp information for synchronizing diagnostic data from multiple sources.
 
 
MOP283 A Hardware Overview of the RHIC LLRF Platform site, controls, monitoring, 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.
 
 
MOP284 A High Performance DAC / DDS Daughter Module for the RHIC LLRF Platform controls, luminosity, synchrotron, injection 648
 
  • T. Hayes, M. Harvey, G. Narayan, F. Severino, K.S. Smith, S. Yuan
    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 upgrade is a flexible, modular system. Output signals are generated by a custom designed XMC card with 4 high speed digital to analog converters interfaced to a high performance field programmable gate array (FPGA). This paper discusses the hardware details of the XMC DAC board as well as the implementation of a low noise rf synthesizer with digital IQ modulation. This synthesizer also provides injection phase cogging and frequency hop rebucketing capabilities.
 
 
MOP293 Performance of Analog Signal Distribution in the ATCA Based LLRF System controls, radio-frequency, FEL, linac 666
 
  • K. Czuba, L. Butkowski, S. Jabłoński, P. Przybylski, D. Sikora
    Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
  • W. Jałmużna, D.R. Makowski
    TUL-DMCS, Łódź, Poland
  • T. Jezynski, F. Ludwig
    DESY, Hamburg, Germany
 
  The Low Level Radio Frequency System (LLRF) for the European X-FEL must provide exceptional stability of the accelerating RF field in the accelerating cavities. The regulation requirements of 0.01% and 0.01 degrees in amplitude and phase respectively must be achieved at a frequency of 1.3 GHz while keeping low drifts (during RF pulse). The quality of analog signal processing and distribution plays a crucial role in achieving these goals. The RF signals are connected to the Rear Transition Module (RTM), downconverted there into intermediate frequency (IF) signals and finally sampled at AMC-ADC module. The high quality of the signals (SNR, low crosstalk) must be assured across all the way. The paper presents the results of development of ATCA based LLRF system for XFEL. The special attention is paid to RTM module with downconverters and carrier board conducting analog signals to the AMC-ADC and the AMC Vector Modulator module in the presence of digital processing components (FPGA, DSP).  
 
MOP295 The Low-level Radio Frequency System for the Superconducting Cavities of National Synchrotron Light Source II cavity, controls, SRF, storage-ring 669
 
  • H. Ma, J. Cupolo, B. Holub, J. Oliva, J. Rose, R. Sikora, M. Yeddulla
    BNL, Upton, Long Island, New York, USA
 
  Funding: US DOE
A digital low-level radio frequency (LLRF) field controller has been developed for the storage ring of The National Synchrotron Light Source-II (NSLS-II). The primary performance goal for the LLRF is to support the required RF operation of the superconducting cavities with a beam current of 500mA and a 0.14 degree or better RF phase stability. The digital field controller is FPGA-based, in a standard format 19”/1-U chassis. It has an option of high-level control support with MATLAB running on a local host computer through a USB2.0 port. The field controller has been field tested with the high-power superconducting RF (SRF) at Canadian light Source, and successfully stored a high beam current of 250 mA. The test results show that required specifications for the cavity RF field stability are met. This digital field controller is also currently being used as a development platform for other functional modules in the NSLS-II RF systems.
 
 
MOP296 Embedded System Architecture and Capabilities of the RHIC LLRF Platform controls, feedback, monitoring, 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.
 
 
MOP297 A Bunch to Bucket Phase Detector for the RHIC LLRF Upgrade Platform feedback, controls, injection, synchrotron 675
 
  • K.S. Smith, M. Harvey, T. Hayes, G. Narayan, S. Polizzo, F. Severino
    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 overall development effort for the RHIC LLRF Upgrade Platform, a 4 channel ADC daughter module was developed to provide high speed, wide dynamic range digitizing and processing of signals from DC to several hundred megahertz. The first operational use of this card was to implement the bunch to bucket phase detector for the RHIC LLRF beam control feedback loops. This paper will describe the design and performance features of this daughter module as a bunch to bucket phase detector, and also provide an overview of its place within the overall LLRF platform architecture as a high performance digitizer and signal processing module suitable to a variety of applications.
 
 
MOP298 Commisioning Results from the Recently Upgraded RHIC LLRF System controls, cavity, feedback, damping 678
 
  • K.S. Smith, M. Harvey, T. Hayes, G. Narayan, F. Severino, S. Yuan, A. Zaltsman
    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
During RHIC Run 10, the first phase of the LLRF Upgrade was successfully completed. This involved replacing the aging VME based system with a modern digital system based on the recently developed RHIC LLRF Upgrade Platform, and commissioning the system as part of the normal RHIC start up process. At the start of Run 11, the second phase of the upgrade is underway, involving a significant expansion of both hardware and functionality. This paper will review the commissioning effort and provide examples of improvements in system performance, flexibility and scalability afforded by the new platform.
 
 
MOP299 Commissioning and Performance of the BNL EBIS LLRF System cavity, controls, resonance, multipactoring 681
 
  • S. Yuan, M. Harvey, T. Hayes, G. Narayan, F. Severino, K.S. Smith, A. Zaltsman
    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 Electron Beam Ion Source (EBIS) LLRF system utilizes the RHIC LLRF upgrade platform to achieve the required functionality and flexibility. The LLRF system provides drive to the EBIS high-level RF system, employs IQ feedback to provide required amplitude and phase stability, and implements a cavity resonance control scheme. The embedded system provides the interface to the existing Controls System, making remote system control and diagnostic possible. The flexibility of the system allows us to reuse VHDL codes, develop new functionalities, improve current designs, and implement new features with relative ease. In this paper, we will discuss the commissioning process, issues encountered, and performance of the system.
 
 
MOP300 The Spallation Neutron Source Eight-Channel Pulsed Power Meter EPICS, controls, monitoring, klystron 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.  
 
TUP039 Low Latency Data Transmission in LLRF Systems controls, alignment, feedback, free-electron-laser 877
 
  • D.R. Makowski, G.W. Jabłoński, A. Napieralski, P. Predki
    TUL-DMCS, Łódź, Poland
 
  Funding: The research leading to these results has received funding from the Polish National Science Council Grant 642/N-TESLAXFEL/09/2010/0.
The linear accelerators applied to drive Free Electron Lasers (FELs), such as the X-Ray Free Electron Laser (XFEL), require sophisticated control systems. The Low Level Radio Frequency (LLRF) control systems of a linear accelerator should provide signal to vector modulator in less than 1 microsecond. Therefore the latency of communication interfaces is more important than their throughput. The paper discusses the application of serial gigabit links for transmission of data in LLRF systems. The latency of pure serial transmission based on Xilinx RocketIO transceivers was evaluated and compared with Xilinx Aurora protocol. The developed low latency protocol will be also presented.
 
 
TUP040 Asset Management Application for a LLRF Control System controls, laser, electron, synchrotron 880
 
  • B. Sakowicz, M. Kamiński, D.R. Makowski, P. Mazur, A. Napieralski, A. Piotrowski
    TUL-DMCS, Łódź, Poland
 
  Funding: The research leading to these results has received funding from the Polish National Science Council Grant 642/N-TESLAXFEL/09/2010/0.
In this article an asset management application for a low level radio frequency (LLRF) control system is described. The system was developed to facilitate management of some aspects of controlling a linear accelerator and, among others, provides means to manage and program multiple firmware versions for a large, distributed and frequently changing set of FPGA devices that are present in a control system. The system introduces a multihierarchical tree-based representation of almost all assets involved in accelerator management.*
* Kamiński M., Makowski D., Mazur P., Murlewski J., Sakowicz B.: "Firmware application for LLRF control system based on the Enterprise Service Bus", CADSM 2009, Ukraine, ISBN 978-966-2191-05-9
 
 
TUP056 BNL 703 MHz Superconducting RF Cavity Testing cavity, resonance, cryogenics, simulation 913
 
  • B. Sheehy, Z. Altinbas, I. Ben-Zvi, D.M. Gassner, H. Hahn, L.R. Hammons, J.P. Jamilkowski, D. Kayran, J. Kewisch, N. Laloudakis, D.L. Lederle, V. Litvinenko, G.T. McIntyre, D. Pate, D. Phillips, C. Schultheiss, T. Seda, R. Than, W. Xu, A. Zaltsman
    BNL, Upton, Long Island, New York, USA
  • A. Burrill
    JLAB, Newport News, Virginia, USA
  • T. Schultheiss
    AES, Medford, NY, USA
 
  Funding: This work received support from Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The Brookhaven National Laboratory (BNL) 5-cell, 703 MHz superconducting RF accelerating cavity has been installed in the high-current energy recovery linac (ERL) experiment. This experiment will function as a proving ground for the development of high-current machines in general and is particularly targeted at beam development for an electron-ion collider (eRHIC). The cavity performed well in vertical tests, demonstrating gradients of 20 MV/m and a Q0 of 1010. Here we will present its performance in the horizontal tests, and discuss technical issues involved in its implementation in the ERL.
 
 
WEOBN4 Multipurpose Controller Based on a FPGA with EPICS Integration controls, EPICS, monitoring, 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]  
 
WEOBN5 Concept and Architecture of the RHIC LLRF Upgrade Platform controls, collider, booster, target 1410
 
  • K.S. Smith, T. Hayes, F. Severino
    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 goal of the RHIC LLRF upgrade has been the development of a stand alone, generic, high performance, modular LLRF control platform, which can be configured to replace existing systems and to serve as a common platform for all new RF systems. The platform is also designed to integrate seamlessly into a distributed network based controls infrastructure, be easy to deploy, and to be useful in a variety of digital signal processing and data acquisition roles. Reuse of hardware, software and firmware has been emphasized to minimize development effort and maximize commonality of system components. System interconnection, synchronization and scaling is facilitated by a deterministic, high speed serial timing and data link, while standard intra and inter chassis communications utilize high speed, non-deterministic protocol based serial links. System hardware configuration is modular and flexible, based on a combination of a main carrier board which can host up to six custom or commercial daughter modules as required to implement desired functionality. This paper will provide an overview of the platform concept, architecture, features and benefits.
 
slides icon Slides WEOBN5 [31.462 MB]  
 
THOCS5 Resonance Control in SRF Cavities at FNAL cavity, controls, SRF, resonance 2130
 
  • Y.M. Pischalnikov, W. Schappert
    Fermilab, Batavia, USA
  • M. Scorrano
    INFN-Pisa, Pisa, Italy
 
  Funding: Work is supported by the U.S. Department of Energy
An adaptive Least Squares algorithm to control Lorentz force detuning in SRF cavities has been developed and tested in the HTS at FNAL. During open-loop tests in the FNAL HTS, the algorithm was able to reduce LFD in a 9-cell 1.3 GHz elliptical cavity operating at 35 MV/m from 600 Hz to less than 10 Hz during both the fill and the flattop. The algorithm was also able to adapt to changes in the gradient of the cavity and to changes in the pulse length.
 
slides icon Slides THOCS5 [3.572 MB]  
 
THP211 Design Features and Construction Progress of 500-Mhz Rf Systems for the Taiwan Photon Source SRF, cryogenics, storage-ring, booster 2513
 
  • Ch. Wang, L.-H. Chang, M.H. Chang, C.-T. Chen, L.J. Chen, F.-T. Chung, F. Z. Hsiao, M.-C. Lin, Y.-H. Lin, C.H. Lo, G.-H. Luo, M.H. Tsai, T.-T. Yang, M.-S. Yeh, T.-C. Yu
    NSRRC, Hsinchu, Taiwan
  • M.C. Lee
    SSRF, Shanghai, People's Republic of China
 
  The accelerator complex of the Taiwan Photon Source (TPS) consists of two 500-MHz RF systems: one RF system with KEKB-type single-cell SRF modules is used for the 3-GeV storage ring of circumference 518 m, and the other with five-cell Petra cavities at room temperature is for the concentric full-energy booster synchrotron. This overview of the construction of the 500-MHz RF systems for the TPS is presented with emphasis on our strategy to approach the expectation of highly reliable SRF operation of the TPS. How to complete the construction project on time, on budget and on performance is our unique concern.