Dr Alessandro Fabris (Sincrotrone Trieste)
Workshop opening, practical information.
Welcome address by Prof. Giovanni Comelli, vice-president Elettra-Sincrotrone Trieste S.C.p.A.
Robert Lopes (Soleil)
Dr Alessandro Fabris (Sincrotrone Trieste)
Elettra Sincrotrone Trieste is a multidisciplinary international laboratory of excellence, specialized in generating high quality synchrotron and free-electron laser light and applying it in materials science. The main assets of the research center are two advanced light sources, the electron storage ring Elettra and the free-electron laser (FEL) FERMI. This presentation provides an overview...
Mark Wissmann (J)
CEBAF (Continuous Electron Beam Accelerator Facility) at Jefferson Lab was initially designed to deliver up to a 4 GeV electron beam simultaneously to three experimental halls. The maximum deliverable energy was raised to 6 GeV and CEBAF ran there until May of 2012 after which CEBAF entered an extensive, upgrade shutdown. After the upgrade, scientists plan to use CEBAF to deliver 11 GeV beam...
Hartmut Büttig (Helmholtz Zentrum Dresden-Rossendorf)
H. Büttig, A. Arnold, A. Büchner, M. Justus, M. Kuntzsch, U. Lehnert, P. Michel, R.Schurig, G. Staats, J.Teichert. Radiation Source ELBE, Helmholtz Zentrum Dresden- Rossendorf, Germany Abstract: In January 2012 the 10 kW klystrons of the CW LINAC ELBE were replaced by pairs of 10kW solid state power amplifiers (SSPA). The talk gives an overview on the SSPA based ELBE RF system....
Mr James Rose (Brookhaven)
The NSLS-II has completed early commissioning with the booster synchrotron utilizing a 80 kW IOT transmitter powering a 7-cell “PETRA” like cavity and the storage ring a 300 kW klystron transmitter powering an identical cavity. The 7-cell cavity in the storage ring will be replaced with a “CESR-B” like superconducting cavity during the May 2014 shutdown. Both the klystron and IOT transmitters...
Myunghwan CHUN (PAL(Pohang Accelerator Laboratory)/POSTECH)
The RF system of the Pohang Light Source-II (PLS-II) storage ring is operating at the 3.0 GeV/300 mA with three superconducting RF (SRF) cavities. PLS-II RF system was upgraded to 3.0 GeV/400 mA(max.) beam storage from 2.5 GeV/ 200mA of PLS. Each high power RF (HPRF) station is composed of a 300 kW klystron with power supply unit, transmission components including a 350 kW circulator and load,...
Mr Kerry Cozad (Continental Electronics Corporation) , Michael Troje (Continentaql Electronics Corp)
Tubes remain the most effective solution for 200 MHz Final Power Amplifier (FPA) design. An overview of design and manufacturing considerations of a 201.25 MHz FPA, built to Los Alamos Neutron Science Center (LANCE) specifications, will be presented. Precision manufacturing and assembly of amplifier components is critical for optimizing performance of advanced tube design, such as the Thales...
Craig Burkhart (S)
RF accelerator electrical energy consumption at the U.S. DOE laboratories was 1 TW-hr in FY2012, and is projected to rise to 1.5 TW-hr by 2018. A major fraction of this energy is used to produce RF power (e.g. this fraction is >50% at SLAC, which is ~40% of the total site energy usage). Although it has long been recognized that improving the efficiency of RF sources would improve...
Chris Adolphsen (SLAC)
At SLAC, a 4 GeV, 1.3 GHz, CW, SCRF linac will be constructed for the LCLS-II project. About 7 kW of rf power will be required per cavity, which will allow operation at 16 MV/m with up to 300 uA beam currents. In the rf system design presented in the project CDR, each cavity in the upstream portion of the machine is powered by a solid state amplifier, while the bulk of the cavities are powered...
Dr Jorn Jacob (ESRF)
In the frame of the ongoing ESRF upgrade phase 1, a new RF section has been recently commissioned with three strongly HOM damped cavities powered by three 150 kW Solid State Amplifiers (SSAs). On the booster, four 150 kW SSAs are replacing the former klystron transmitter since April 2012. Twelve additional HOM damped cavities have been ordered at the end of 2013 for the projected low emittance...
Mr Alun Watkins (Diamond Light Source) , Chris Christou (D) , Dr Pengda Gu (Diamond Light Source)
Diamond Light Source is a synchrotron light source facility that has been providing beam for users since January 2007. Diamond consists of a 3 GeV storage ring powered by two 300 kW amplifiers each containing four IOTs, a full energy booster also driven by an IOT-based amplifier and a 100 MeV linac using pulsed klystrons. RF performance and reliability are reviewed for all three accelerators...
Dr Yoon Kang (Oak Ridge National Laboratory)
SNS has been operating successfully and ramping beam power steadily to 1.4 MW the design power at 1.0 GeV beam energy. Availability of RF systems has been improved to ~ 95% over the years since commissioning of SNS. Improvements have been made in operation of accelerating structures, RF windows and couplers, and high voltage converter modulators (HVCM) for klystrons for powering nearly 100...
Tao Tang (S)
Gallium nitride (GaN) RF transistors have higher power handling capacity, higher efficiency and higher operation frequency compared with silicon RF transistors, which makes GaN device a better choice for continuous wave (CW) RF applications. Due to low yield in device fabrication, GaN transistors used to have a much higher price than silicon ones. As a result, high power RF source using GaN...
Mr Douglas Horan (Argonne National Laboratory)
Technical performance of the Advanced Photon Source rf systems from May 2012 to May 2014 is discussed. Significant hardware problems and failures affecting rf system reliability, and approaches taken to resolve them, are described in detail. System upgrades to enhance performance and reliability are described. The design and construction details of a 5kW S-band cw amplifier developed for...
Eric Montesinos (CERN)
Description of high average Fundamental Power Coupler designed at CERN over the last 20 years. Main difficulties and power limitations. Some tips to propose better designs.
5. A Significant Increase of the Efficiency at the Operating Point of Very High Power Solid State RF Amplifiers (50 MHz to 1.3 GHz) by Remote P1 Control
Dr Nico Pupeter (Cryoelectra GmbH)
A new technique was developed to increase the efficiency of very high power RF amplifiers (50 MHz to 1.3 GHz) at a freely chosen operating point. This improvement can be achieved for a large range of output power by a remote P1-point control. The choice of the P1-point of an RF amplifier is a compromise between increased efficiency vs. increased harmonics and decreased linearity. Typically,...
Mr Jonathan Stampe (Canadian Light Source)
The Canadian Light Source synchrotron has been using the CESR-B type 500 MHz superconducting cavity for over 10 years. This presentation will discuss operating experience with these cavities to date.
Patrick Marchand (Synchrotron SOLEIL)
In the SOLEIL storage ring, two cryomodules provide to the electron beam an accelerating voltage of 3-4 MV and a power of 575 kW at 352 MHz. Each cryomodule contains a pair of superconducting cavities, cooled with liquid Helium at 4.5 K, which is supplied by a single 350 W cryogenic plant. The RF power is provided by four solid state amplifiers (SSA), each delivering up to 180 kW. The...
Mr Michel Langlois (ESRF)
A 12 kW amplifier operating at 352 MHz has been designed, developed and built at ESRF. It uses a resonant cavity to combine the power of 18 home made RF modules. This is a prototype for a bigger amplifier which is currently under construction. The main features of this smaller version will be described, together with hopefully interesting considerations on manufacturing. The performances...
Mr Jesús Ramón Ocampo Pérez (CELLS-ALBA)
**Status and Operation of the ALBA RF System** *J.Ocampo, B.Bravo, A.Salom, F.Perez* **Abstract** ALBA is a 3 GeV, 400 mA, 3rd generation Synchrotron Light Source in operation for users since May 2012, in Barcelona, Spain. The RF System has to provide 3.6 MV of accelerating voltage and restore up to 540 kW of power to the electron beam. For that six RF plants, working at 500 MHz, are...
Eric Montesinos (CERN)
A brief description of the two tetrode power plants of the CERN-SPS. Some statistics accumulated with more than 100 tetrodes over almost 40 years of operation. Some horrors that occured over the period...
Dr Daniel Valuch (CERN)
Important HV electrical parameters of the LHC klystron amplifier are monitored by the control system. The currents are measured by external DCCTs on HV cables at ground potential, voltage dividers are isolated by V to f converters. The system performes well, but many components are at the end of their lives and measurement accuracy and access to the data for trouble shooting could be...
Richard Nelson (Jefferson Lab)
Designed as a 4 GeV electron machine, CEBAF was run at 6 GeV. Major upgrades implemented over the past several years increased capabilities to12 GeV. 80 CW RF channels of a new design were added to the existing 340 channels to achieve this energy. As previously reported, a new, higher power klystron design, new HV power supplies, plus new controls and interlocks were required. Deliveries of...
Stefan Choroba (DESY)
The European XFEL requires twenty-seven high power RF stations at 1.3GHz capable of a peak RF power of 10MW at 1.37ms pulse duration and 10Hz repetition rate. Twenty-five RF stations supply RF power to one-hundred cryogenic modules each with eight nine-cell superconducting cavities. Two RF stations are reserved for the RF gun and one cryogenic module in the injector of the European XFEL. Each...
13. Improvements to the APS LINAC & SR / Booster klystron high-voltage power supplies and accomplishments of the 352MHz RFTS
Mr Gianfranco Trento (Argonne National Laboratory)
Two of the Fiscal Year 2014 Radio Frequency (RF) Group machine operation goals are to maintain mean time between faults at 100 hours or better and maintain injector, storage ring (SR), and x-ray production availability at 97% or better. To continue to meet these goals, an aggressive approach was instigated to combat parts obsolescence and aging of the accelerator systems. The latest...
In order to increase beam transmission efficiency and intensity of ion beams, a major upgrade project has been conducted at Argonne Tandem Linac Accelerator System (ATLAS). A 4-meter long 60.625 MHz CW radio-frequency quadrupole (RFQ) has been developed, built and commissioned with beam in 2012. The RFQ has been used in the regular operation since January, 2013 and is capable of providing 295...
Heejin Do (I)
TEM-like superconducting quarter wave resonator (QWR) is adopted for the lowest optimum beta (0.047) section of the RAON. For the proper acceleration of heavy ions in QWR, 3 kW, 81.25 MHz RF power is supplied through coaxial couplers. For acceleration of heavy ion beam in the superconducting linear accelerator, the Low-Level RF (LLRF) should have feedback control of accelerating field and...
Mrs Khorshid Sarhadi (Iranian Light Source Facility (ILSF), Institute for Research in Fundamental Sciences (IPM), Tehran, Iran, P.O. Box 19395-5746)
The Iranian Light Source Facility (ILSF) RF system was conceptually designed in accordance with the requirements for ILSF 3GeV storage ring with 400 mA beam current at 500 MHz RF frequency. The development of the solid state amplifiers initiated with the design and fabrication of two amplifier modules based on BLF578 and MRFE6VP1K25HR6 transistors and 670W and 540W stable RF power were...
Mr Rodolphe Marchesin (THALES Electron Devices) , Mr Stephane Bethuys (THALES Electron Devices)
Thales ED has an experience of more than fifty years in high power RF tubes design and manufacturing, from klystrons and grid tubes amplifiers to gyrotrons oscillators. This talk presents recent high power / high efficiency solutions (experimental results and designs) which are suited for the next generation of particles accelerators. Namely, one of the future large scale linacs main...
Dr Cristina de la Morena (Ciemat)
The IFMIF/EVEDA Accelerator Prototype (LIPAc) is currently under construction in Rokkasho (Japan). LIPAc will generate a 9 MeV deuteron beam at 125 mA current with a 100% of duty cycle, and it will serve to validate the final IFMIF accelerator concept. The radiofrequency (RF) Power System, which is being integrated by CIEMAT (Spain) and its partner companies and institutes, consists of 18...
Ms Woo-Kyung Han (Institute for Basic Science)
RAON, heavy ion accelerator for rare isotope science, is under development for the Rare Isotope Science Project (RISP) at Institute for Basic Science in South Korea. Radio-Frequency Quadrupole (RFQ), a component of RAON, accelerates heavy ion beams from 10 keV/u up to 500 keV/u at the current of 12 pμA and the frequency of 81.25 MHz. For RISP RFQ prototype, a 15kW CW RF power coupler has been...
Dr Hoechun Jung (Institute for Basic science)
Four kinds of superconducting resonators (Quarter wave resonator, half wave resonator, and Single spoke resonator type 1, type 2) are designed and developed for the heavy ion accelerator the RAON. Resonators which have extreme high Q-factor 10E9 ~ 10E10, are filled up through coaxial RF power couplers of over coupling at 81.25MHz (QWR), 162.5MHz (HWR), 325MHz (SSR) respectively. Cavities are...
45. Very High Power Solid State Amplifiers in the Range of 50MHz to 1.3GHz of Industrial Design with Very High Efficiency
Dr Nico Pupeter (Cryoelectra GmbH, Germany)
A new series of solid-state RF amplifiers will be presented, which cover the frequency range from 50MHz to 750MHz with an output power of more than 100kW. The amplifiers are of industrial design regarding their space and maintenance requirements. They have been designed for the operation of Cyclotrons, Synchrotrons, Storage Rings and Linear Accelerators. The specific design of the...
Eric Montesinos (CERN)
Summary of the recent purchasing of the new Solid State driver Amplifiers for the LHC Injectors Upgrade programme. Technical Specifications description and offers from suppliers analysis.
Jae Eun Han (I)
the RAON accelerator complex is planned in Korea for nuclear science research, and solid state power amplifiers will be used to provide superconducting cavities with rf power. The RAON main accelerator is composed of a normal conducting injector and a superconducting linac. The SC linac uses 3 types of SC cavities which are QWR, HWR and SSR. The SSR is divided into two families of low and high...
Dr Daniel Valuch (CERN)
A new generation of Arc Detectors was developed at CERN for the Linac4. For reliability reasons the detectors do not use optical fibres. Each sensor head is equipped by four independent photo detectors with optional two "blind" sensors for environments with high radiation background. Since the first introduction in 2012 the detector design has been finalised, the housing ruggedised and made...
Markus Schneider (Paul Scherrer Institut)
This year PSI celebrated the 40 years anniversary of the Ring cyclotron. This is the main accelerator of the high intensity proton accelerator facility, where protons are accelerated up to 590 MeV. In several upgrade programs the beam current was increased from the initial design value of 100 µA up to 2.4 mA. The rf-system of this separated sector cyclotron consists of 4 copper cavities...
Mr Bodo Fritsche (Ampegon AG, Turgi)
High Power Solid State RF Amplifiers are being pushed in the market. With the latest generation of LDMOS transistors a high RF power per unit can be generated. Many of these RF modules combined in a single system is a serious competitor to the long established tube technology. Several solid state RF systems have already been realized and used very successfully for RF generation at particle...
Dr Shigeki Sasaki (SPring-8/JASRI)
Over 15 years of operation of the SPring-8 storage ring, we encountered several troubles in the RF system. Some of them will be picked up for the report. As an example, we experienced the water leakage from the photon absorbers for the synchrotron radiation to protect RF cavities. The cause was found to be the pinholes created by corrosion of the absorber water channel wall by the...
Salvatore Polizzo (Brookhaven National Lab)
A new 9MHz RF system operating at 180KV per ring is required to increase the luminosity of low energy gold ion collisions at the Relativistic Heavy Ion Collider. In order to accommodate all planned collision energies each cavity will be required to operate between 8.7MHz and 9.4MHz while continuously providing 60KV of gap voltage. The proposed design includes a new capacitively loaded gap...
Mr NASHAT SAWAI (RF group SESAME)
The SESAME ( Synchtrone Light Source For Experimental Since And Applications in The Middle- East) Accelerator consists of a 22 MeV Microtron , and 800Mev Booster and 2.5 GeV storage Ring . Each accelerator has its own RF system. The Microtron RF frequency is 3 GHz generated by 2 MW pulsed Magnetron, including 41KV modulator works as power supply for magnetron , while the Booster and...
Morten Jensen (European Spallation Source)
The European Spallation Source, a 5 MW average power, pulsed proton linac, will accelerate 62.5 mA of protons to an energy of 2 GeV. Each pulse is 2.86 ms and repeats at 14 Hz, resulting in a power-to-beam requirement per pulse of 125 MW of RF power. The split installation schedule means that existing, more mature technology is considered for the first part of the programme but for the later...
Dr Daniel Valuch (CERN)
The counter-rotating proton beams in the Large Hadron Collider (LHC) are captured and accelerated to their final energies by two identical 400 MHz Radio Frequency (RF) systems. The RF power source required for each beam comprises eight 300 kW klystrons. Each unit of four klystrons is powered by a 100kV/40A AC/DC power converter. A fast protection system (crowbar) protects the four klystrons in...