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Seventh CW and High Average Power RF Workshop

7–11 May 2012
Danfords Hotel & Marina
EST timezone

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Contribution List

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  1. 44. Greetings
    08/05/2012, 08:30
  2. 45. Agenda and overview
    08/05/2012, 09:00
  3. 6. NSLS-II RF Systems: Status and Upgrade Plans
    Mr James Rose (Brookhaven)
    08/05/2012, 09:30
    Oral
    Session 1
    The NSLS-II is a third generation 3 GeV light source designed for 500mA of circulating current and up to 1.2 MW of installed RF power. The RF systems consist of a 200 MeV S-band pulsed LINAC, 90 kW IOT based transmitter powering a 7 cell cavity for the booster and up to four 500 MHz SRF systems and two 1500MHz SRF passive cavities in the storage ring distributed equally in two RF straight...
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  4. 12. NSLS I : Challenges and upgrades on a 30 year old high power RF systems
    Aditya Goel (B)
    08/05/2012, 10:00
    Oral
    Session 1
    The National Synchrotron Light Source consists of an x-ray ring operating with 300mA stored beam at 2.8 GeV and a UV ring with 1 ampere of stored beam at 800 MeV and a shared injector linac and booster. It has been in operation since 1979. The RF systems at this facility cover a wide variety of RF technologies from high power tetrode tube based systems to moderate power solid state devices....
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  5. 15. RF POWER UPGRADE AT JEFFERSON LAB
    Richard Nelson (Jefferson Lab)
    08/05/2012, 11:00
    Oral
    Session 1
    Eighty RF positions are being added to the existing 340 as part of an energy doubling upgrade at Jefferson Lab. Built around a newly designed and higher efficiency 13 kW klystron developed for JLab by L-3 Communications, each new RF chain is completely revamped because of increased power capabilities, yet needed to fit into an existing footprint. This paper will discuss the main components of...
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  6. 32. Elettra 500 MHz RF Power Plants
    Cristina Pasotti (Sincrotrone Triest S.C.p.A.)
    08/05/2012, 11:30
    Oral
    Session 1
    A review of the ELETTRA Storage Ring and Full Energy Injector 500 MHz RF power plants ( klystron and IOT sources) is described as well as their performances and maintenance procedure. An introduction on RF power projects and future installations is given
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  7. 29. Upgrades, operational experience and EM simulations of the Diamond SR High Power Amplifiers
    Morten Jensen (D)
    08/05/2012, 12:00
    Oral
    Session 1
    We present here a selection of results and some of the major upgrades specific to the high power amplifiers.
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  8. 2. The IPHI 352 MHz RF source at CEA/Saclay
    Mr Abdallah Hamdi (CEA/Saclay)
    08/05/2012, 13:30
    Oral
    Session 2
    The IPHI (High Intensity Proton Injector) is a facility developed at CEA/Saclay in collaboration with CERN and IN2P3. The final step of this Low Energy accelerator prototype designed to accelerate beams up to 100 mA with energy up to 3 MeV is in progress. An overview of the main components is given, the RF source is described and last RF measurements are shown.
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  9. 30. The SNS MEBT RF Power Amplifier Solid State Upgrade
    Mark E. Middendorf (Argonne National Laboratory)
    08/05/2012, 14:00
    Oral
    Session 2
    The original vacuum-tube-based rf power amplifiers (four online, two spare) that drove the four rebunching cavities on the Spallation Neutron Source (SNS) Medium Energy Beam Transport (MEBT) structure have been replaced with commercially available 25-kW solid state amplifiers (4 online, one spare). A 4+1 switch matrix permits remote switching of the spare amplifier into any one of the four...
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  10. 20. RF power source and distribution at 352 MHz for spoke cavities for ESS and at FREIA
    Dr Rutambhara Yogi (Uppsala University, Sweden)
    08/05/2012, 14:30
    European Spallation Source (ESS) is one of the world’s most powerful neutron sources. The ESS linac will accelerate 50mA of protons to 2.5GeV in 2.86ms long pulses at a repetition rate of 14 Hz. It produces beam with 5MW average power and 125MW peak power. There are 36 superconducting spoke resonators, which provide a power of 0.5MW to the beam. FREIA (Facility for Research...
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  11. 8. The Advanced Photon Source 352-MHz RF Systems -- A Case for Solid State?
    Mr Douglas Horan (Argonne National Laboratory)
    08/05/2012, 15:00
    Oral
    Session 2
    The Advanced Photon Source (APS) booster and storage ring rf systems utilize 352-MHz, 1.2 MW klystrons as final rf amplifier devices. After seventeen years of APS operation, optimized system designs and detailed preventative maintenance activities have resulted in rf system reliability statistics that have exceeded the wildest expectations hoped for at the start of APS operations. How we...
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  12. 21. The European Spallation Source RF System Design
    David McGinnis (European Spallation Source)
    08/05/2012, 16:00
    Oral
    Session 2
    The European Spallation Source Linac reaches an energy of 2.5GeV within 350 meters. The linac delivers an average power of 5 MW with a 4% duty factor (2.9 mSec pulse at a rate of 14Hz). The peak power of the linac is over 123 MW. This averages to a peak power density that must be supplied to the beam of over 350kW/meter. Because of the large power density, 98% of the linac consists of...
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  13. 11. Operation status and commissioning of four 150 kW SSA on the ESRF booster
    Jean-Maurice Mercier (ESRF)
    08/05/2012, 16:30
    Oral
    Session 2
    The operation performance of the ESRF RF system will be presented, followed by a detailed report on the procurement, installation, test and commissioning of four 150 kW solid state amplifiers on the booster.
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  14. 39. CW RF Systems at the CLS
    Jonathan Stampe (C)
    08/05/2012, 17:00
    Oral
    Session 2
    The Canadian Light Source is a third generation 2.9 GeV synchrotron light source which has been operational since 2003. This talk will discuss the booster ring and storage ring RF system architecture, performance, reliability and improvements made since commissioning.
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  15. 38. Current activities on the rf-system for the proton accelerator facility at PSI
    Markus Schneider (Paul Scherrer Institut)
    08/05/2012, 17:30
    Oral
    Session 2
    At PSI, protons are accelerated up to an energy of 590 MeV by two separated sector cyclotrons, the Injector 2 and the Ring. Since 2008 the Ring cyclotron is running with 4 copper cavities. By increasing the cavity voltage to 850 kVp the number of turns was reduced and the beam current is increased up to 2.4 mA, which results in a beam power of 1.4 MW. In 2010 the regular operation suffered...
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  16. 16. Evolution of High Power LDMOS Transistors at NXP
    Scott Blum (N)
    09/05/2012, 08:00
    This presentation will discuss the evolution of high power transistors at NXP Semiconductors. It will focus on the technology specific to the frequency bands most utilized by the accelerator community. It will show the improvements in performance, and what those improvements can bring to the design community. Finally, future roadmaps will be shown. This will be a platform to start...
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  17. 26. High power RF amplifiers using LDMOS technology
    Mr Yicih (Dave) Zhang (Freescale Semiconductors)
    09/05/2012, 08:45
    This presentation will cover Freescale high power RF amplifiers using LDMOS technology, and some its advantage it brings over traditional technologies. It will also cover topics regarding design support, thermal characterization and ruggedness/reliability. Presentation will conclude with an outlook on future trends of LDMOS RF amplifiers.
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  18. 42. reserve for discussion
    09/05/2012, 09:30
  19. 17. 150kW SSA for ESRF Booster Upgrade
    Jean-Paul ABADIE (ELTA-AREVA)
    09/05/2012, 10:00
    In the frame of ESRF Booster Upgrade, ELTA-AREVA has designed and provided four 150kW Amplifier at 352 MHz, based on Solid State Amplifier technology. The presentation describes main features and performances of the 150 kW SSA that have been qualified on fictive terminations and have been recently connected to Booster cavities. The SSA is based on 650W LDMOS Power Amplifier Modules,...
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  20. 4. First Experience at ELBE with the new 1.3 GHz CW RF-System based on 10kW Solid State Amplifiers
    Dr Hartmut Büttig (Helmholtz Zentrum Dresden-Rossendorf)
    09/05/2012, 11:00
    With the expansion of the radiation source ELBE, a centre for high power radiation sources is being built between 2009 and 2014 at the Helmholtz Zentrum Dresden Rossendorf. One part of this program is to increase the beam current of the ELBE LINAC. In January 2012 each of the 10kW CW klystrons used to operate the superconducting cavities of ELBE since 2001 had been replaced by a pair of 10kW...
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  21. 10. Development at the ESRF of advanced solid state amplifiers for accelerators
    Dr Jorn Jacob (ESRF)
    09/05/2012, 11:30
    The ESRF has ordered seven 150 kW solid state amplifiers (SSA) from ELTA. In parallel, the ESRF has started an R&D program for mroe compact and less costly SSA using planar balun circuits and cavity combiners. The status of the project will be reported. * This work receives supported from the EU in the framework of the FP7/ESFRI/CRISP program.
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  22. 37. Developments of high CW RF power solid state amplifiers at SOLEIL
    Ti Ruan (Synchrotron SOLEIL)
    09/05/2012, 12:00
    At SOLEIL, 5 Solid State Amplifiers (SSA) are providing the required 352 MHz CW power : 1 x 35 kW in the Booster (BO) cavity and 4 x 180 kW on the 4 superconducting cavities of the Storage Ring (SR). Based on a design fully developed in house, they consist in a combination of a large number of 320 W elementary modules (1 x 147 in the BO and 4 x 724 in the SR) with MOSFET transistors,...
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  23. 31. Inductive Output Tube (IOT) Development at CPI
    Edward L. Eisen (CPI, Palo Alto)
    10/05/2012, 08:00
    The Inductive Output Tube (IOT) has played a major role in in the broadcast television industry for many years, due to the IOTs improved efficiency, linearity and reduced footprint compared to the klystron. In the past decade this electron device has found expanded use in both RF accelerator systems and military defense applications. The IOT can provide continuous wave power up to hundreds of...
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  24. 23. 90 kW CW IOT Development at L-3 Communications Electron Devices
    Michael Boyle (L-3 Communications Electron Devices)
    10/05/2012, 08:45
    L-3 Communications Electron Devices has developed a 90 kW CW 500 MHz IOT for the BNL NSLS-II Booster RF Transmitter System. L-3 has been manufacturing IOTs for use in UHF terrestrial broadcast applications since 1998. Details regarding design modifications to our standard broadcast IOT along with performance data will be presented.
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  25. 43. reserve for discussion
    10/05/2012, 09:30
  26. 28. The Diamond Storage Ring IOT Based High Power Amplifier
    Morten Jensen (D)
    10/05/2012, 10:00
    Diamond currently operates its storage ring with two high power IOT based amplifiers. Each amplifier combines the output of up to four 80 kW IOTs. We present here the outline design of the amplifier and operational parameters.
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  27. 25. Testing & Commissioning a New Klystron at the ALS - Lessons Learned
    Kenneth Baptiste (Lawrence Berkeley National Laboratory)
    10/05/2012, 11:00
    Oral
    Session 6
    I will present the the issues that we encountered and ultimately overcame while testing and commissioning our new 300kW class klystron. Issues such as unexpected mod-anode PS ripple frequencies, HV electro-static shielding, correct biasing of the mod-anode electrode during a fast HV fault, HV turn-on transients, filament resistance changes, etc.
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  28. 33. 10 years of klystron operation and improvement in Swiss Light Source
    Mr Wolfgang Tron (Paul Scherrer Institut)
    10/05/2012, 11:30
    Oral
    Session 6
    Last year we celebrated the 10th anniversary of commissioning the Swiss Light Source. The heaters of all klystrons collected about 255’000 hours during this time and the overall operation was extremely successful. Nevertheless several issues, like reinforcing the HV cabinet, coincident arc detection and cooling air interlock had to be improved. These klystrons are not any longer produced by...
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  29. 36. LHC RF power system. Status, experience with nominal beam, upgrades during the long technical stop.
    Dr Erk Jensen (CERN)
    10/05/2012, 12:00
    Oral
    Session 6
    placeholder for the CERN colleagues
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  30. 27. Short Circuit Energy
    Andre Spichiger (T)
    10/05/2012, 13:30
    Oral
    Session 7
    Short circuit energy considerations using the example of a pulse step modulator based HVPS.
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  31. 5. Performance and Upgrades of the Advanced Photon Source (APS) 352MHz / 1-MW Klystron Power Systems*
    Gian Trento (A)
    10/05/2012, 14:00
    Oral
    Session 7
    Essential for operation of the APS booster and storage ring are the high power radio frequency (rf) systems. The high-power rf system consists of five individual 100-kV, 20-A DC power systems each feeding its respective 1-MW continuous wave klystron. Each power system contains a medium voltage electrical substation, a 1400-V SCR gated voltage regulator, a 100-kV rectifier, an ignitron crowbar...
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  32. 24. High Voltage Power Supply for the ALS Storage Ring RF system-Disconnect Switch status.
    Mr Slawomir Kwiatkowski (LBNL)
    10/05/2012, 14:30
    Oral
    Session 7
    The new ALS Main Ring 500MHz RF system will require significant modification of the existing HV power supply in which classical ignitron based crow-bar system will be replaced with house made solid state disconnect switch which is undergoing final high power test. The principle of the operation and the status of the testing will be presented.
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  33. 9. New HOM damped cavities at the ESRF
    Dr Jorn Jacob (ESRF)
    10/05/2012, 15:00
    Oral
    Session 7
    New HOM damped cavities have been developed at the ESRF on the basis of the BESSY/ALBA cavity. Three prototypes have been built by three companies RI, SDMS and CINEL following different manufacturing procedures. The first one is under test on the storage ring, the second one is ready for tests to be started next summer and the last one is to be delivered in the coming weeks. Design features,...
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  34. 19. RF fundamental power coupler news
    Eric Montesinos (CERN)
    10/05/2012, 16:00
    Oral
    Session 7
    Recent fundamental power coupler designs and tests for various projects such as SPL, Linac4, ESRF, SOLEIL, APS, HIE-Isolde.
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  35. 13. Design, simulations and conditioning of 500kW CW FPCs for the ERL SRF gun at BNL
    Dr Wencan Xu (Brookhaven National Lab)
    10/05/2012, 16:30
    Oral
    Session 7
    BNL 704MHz SRF gun for ERL uses two high power fundamental power couplers (FPCs) to deliever 1MW CW RF power to gun cavity. Prior to install the FPCs to the cavity, we used the 1MW klystron to condition the two couplers. This paper will address design of the high power couplers, conditioning test of the FPCs. Multipacting simulation using Track3P and comparison with conditioning will be...
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  36. 7. Status of the Advanced Photon Source (APS) 352-MHz Radio Frequency Test Stand (RFTS)*
    Gian Trento (Argonne National Laboratory)
    10/05/2012, 17:00
    Oral
    Session 7
    The APS 352MHz radio frequency test stand (RFTS) was constructed in 2002 primarily to test and condition storage ring and booster rf cavity components. Since the rf test stand’s inception, modifications have been made to increase the RFTS’s testing capabilities. These modifications include: the installation of a solid state switch / mod-anode regulator, a high-voltage switch tank, access to...
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  37. 22. The cavity for RF input coupler conditioning at SPring-8
    Dr Shigeki Sasaki (SPring-8/JASRI)
    10/05/2012, 17:30
    Oral
    Session 7
    We have developed a cavity specifically used for the coupler conditioning. For the booster synchrotron, 5-cell cavities are used and maximum 300-kW RF power must be fed through the couplers, whereas for the storage ring single cell cavities are used and the power fed through the coupler is 150 kW at maximum. Each coupler should be conditioned before the installation to the actual machine. We...
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  38. 40. High Power RF Distribution with Vector Control for Multicavity Cryomodule Test
    Dr Yoon Kang (Oak Ridge National Laboratory)
    11/05/2012, 08:00
    Oral
    Session 8
    A four-way waveguide RF power distribution system for testing the SNS multi-cavity cryomodule to investigate the collective behavior has been developed. A single klystron operating at 805MHz in 60Hz 8% duty cycle powers the 4-way waveguide splitter to deliver up to 600 kW to Individual cavities. Each cavity is fed through a waveguide vector modulator at each splitter output with magnitude and...
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  39. 35. Standing Wave Issue in Waveguide Directional Coupler Calibration Process
    Dr Nikolai Schwerg (CERN)
    11/05/2012, 08:30
    Oral
    Session 8
    The low-level RF system for LHC and Linac4 relies on the accurate readings of waveguide directional couplers as well as the cavity antenna measurements. A good calibration of both is crucial for an effective regulation. We briefly revise the working principle of waveguide directional couplers and illustrate the coupler calibration process. Inevitable standing waves in the calibration setup...
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  40. 18. A new generation of arc detectors for the LHC and Linac4 high power RF system
    Dr Daniel Valuch (CERN)
    11/05/2012, 09:00
    Oral
    Session 8
    During operation, the LHC high power RF equipment has to be protected from damage caused by electromagnetic discharges (arcs). The LHC waveguide arc detector system is based on the optical detection of the discharge through small apertures in the waveguide walls, optical fibres and very sensitive photo detectors. Experience shows that some of the currently used optical fibres suffer from...
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  41. 14. Status of the the S-band RF Power System for the FERMI@Elettra Linac
    Dr Alessandro Fabris (Sincrotrone Trieste)
    11/05/2012, 09:30
    Oral
    Session 8
    FERMI@Elettra is a single-pass linac-based FEL user-facility covering the wavelength range from 100 nm (12 eV) to 4 nm (310 eV) and is located next to the third generation synchrotron radiation facility Elettra in Trieste, Italy. The machine is presently under commissioning and the first FEL line (FEL-1) will be opened to the users by the end of 2012. The 1.5 GeV linac is based on S-band...
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  42. 34. SRF Cryomodule Construction and Photocathode Prototyping at AES
    David Meidlinger (A)
    11/05/2012, 10:00
    Oral
    Session 8
    Current activities by AES in the construction of single-cell 500 MHz SRF cryomodules for NSLS-II will be discussed as well as aspects of the protyping of a BNL/AES SRF electron gun designed for 500 mA average beam current.
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