Keyword: klystron
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MOYBA02 New Design Approaches for High Intensity Superconducting Linacs – The New ESS Linac Design cryomodule, linac, cavity, emittance 23
 
  • D.P. McGinnis
    ESS, Lund, Sweden
 
  The cost of the next generation of high intensity accelerators has become so large that no single institution can solely afford to fund the construction of the project. To fund these large projects, institutions have embarked on forming ambitious collaboration structures with other laboratories. To induce other laboratories to join the collaboration, compromises must be made in the accelerator technical design to offer interesting and challenging projects to partner institutions. The cost of high intensity hadron accelerators is largely driven by RF system. A new design philosophy different from the traditional approach is emerging for the high intensity frontier machines. Emittance preservation is often less of an issue as long as beam losses are kept low. At ESS modifications were introduced to the linac design. One of the major changes is the reduction of final energy and an increase of gradient and beam current. As a result the design now meets the cost objective but for the price of a higher risk. The accelerator system designer must then try to balance the cost and technical risks while also satisfying the interests and external goals of the partner laboratories.  
slides icon Slides MOYBA02 [2.277 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOYBA02  
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MOOCA01 High Power Test Results of the SPARC C-Band Accelerating Structures controls, accelerating-gradient, vacuum, operation 39
 
  • D. Alesini, M. Bellaveglia, M.E. Biagini, R. Boni, P. Chimenti, R. Clementi, G. Di Pirro, R. D. Di Raddo, M. Ferrario, A. Gallo, V.L. Lollo
    INFN/LNF, Frascati (Roma), Italy
  • M. Brönnimann, R. Kalt, T. Schilcher
    PSI, Villigen PSI, Switzerland
  • L. Ficcadenti
    INFN-Roma, Roma, Italy
  • L. Palumbo
    URLS, Rome, Italy
 
  The energy upgrade of the SPARC photo-injector at LNF-INFN (Italy) from 150 to more than 240 MeV will be done by replacing a low gradient S-Band accelerating structure with two C-band structures. The structures are Traveling Wave (TW) and Constant Impedance (CI), have symmetric axial input couplers and have been optimized to work with a SLED RF input pulse. In the paper we present the results of the low and high power RF tests on the two final fabricated structures that shown the feasibility of the operation at accelerating gradients larger than 35 MV/m.  
slides icon Slides MOOCA01 [6.242 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOOCA01  
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MOPRO003 Towards Stable Acceleration in Linacs acceleration, bunching, electron, linac 65
 
  • A. Dubrovskiy
    Private Address, Geneve, Switzerland
 
  Ultra-stable and -reproducible high-energy particle beams with short bunches are needed in novel linear accelerators and, in particular, in the Compact Linear Collider CLIC. A passive beam phase stabilization system based on a bunch compression with a negative transfer matrix element R56 and acceleration at a positive off-crest phase is proposed. The motivation and expected advantages of the proposed scheme are outlined.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO003  
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TUPRI077 Stabilization of Mid-infrared FEL by Feedback Controls FEL, feedback, electron, gun 1745
 
  • H. Zen, M. Inukai, T. Kii, K. Masuda, M. Mishima, H. Negm, H. Ohgaki, K. Okumura, K. Takami, K. Torgasin, Y. Tsugamura, K. Yoshida
    Kyoto University, Kyoto, Japan
 
  A Mid-Infrared Free Electron Laser facility, KU-FEL* has been developed for energy related sciences. A beam position monitor and feedback system was introduced to stabilize the FEL output power and wavelength. The long term stability of FEL power and wavelength has been drastically improved by the feedback control. The developed feedback system and its performance will be reported in the conference.
*H. Zen, et al., Infrared Physics & Technology, vol.51, 382-385.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI077  
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WEPRO113 Status of the Radiation Source ELBE Upgrade laser, electron, operation, radiation 2233
 
  • P. Michel, T.E. Cowan, U. Lehnert, U. Schramm
    HZDR, Dresden, Germany
 
  ELBE is based on a 40 MeV superconducting Electron Linac able to operate in CW mode and provides manifold secondary user beams. The suite of secondary beams include: two free electron lasers operating in the IR/THz regime; a fast neutron beam; a Bremsstrahlung gamma-ray beam; a low-energy positron beam; and patented single-electron test beams. The primary electron beam is also used for radiobiology research, or in interaction with ultra-intense PW-class lasers. Through 2014 ELBE will be upgraded to a Centre for High Power Radiation Sources. The ELBE beam current was increased to 1.6 mA by using novel solid state RF amplifiers. The concept also contains additional broad and narrow band coherent THz sources and the development of a 500 TW TiSa Laser and even a 1.5 PW diode pumped laser system. Laser plasma electron acceleration and proton acceleration experiments for medical applications are planned. Additionally, coupled electron laser beam experiments like Thomson scattering or injection of ELBE electron into the laser plasma will be done.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO113  
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WEPME003 Two Years Experience with the Upgraded ELBE RF System Driven by 20kW Solid State Amplifier Blocks (SSPA) operation, linac, cavity, SRF 2257
 
  • H. Büttig, A. Arnold, A. Büchner, M. Justus, M. Kuntzsch, U. Lehnert, P. Michel, R. Schurig, G.S. Staats, J. Teichert
    HZDR, Dresden, Germany
 
  Since January 2012 the Superconducting CW Linac ELBE is equipped and in permanent operation with four 20 kW Solid State Amplifier Blocks. The poster gives an overview on the design of the new RF system and the experience gained within the first two years of operation.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME003  
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WEPME009 Principles for Design of High Power Pulsed Microwave Devices and Devices with Low Operating Voltage for Accelerators gun, electron, controls, solenoid 2273
 
  • K.G. Simonov, A.A. Borisov, I.I. Golenitskiy, A.V. Mamontov, A.N. Yunakov
    ISTOK, Moscow Region, Russia
  • O.A. Morozov
    Research and Production Co. "MAGRATEP", Fryazino, Russia
 
  The principle of obtaining the extra-high pulsed power at significantly lower operating voltages by creating klystrons with magnetron gun; location of several such klystrons in a single solenoid with a homogeneous magnetic field and summing their output capacities is proposed. The principle of designing of high-power klystron with multi-beam magnetron gun with anode modulation and several energy outputs is proposed. The principle of designing of high-power klystron magnetron gun with multi-beam magnetron gun with control electrode modulation and several energy outputs is proposed. Are given the results of theoretical studies demonstrating the feasibility of such devices and high-power microwave systems based on them. During development of principles of obtaining an extra-high power were used the design of single-beam klystron with magnetron gun with control electrode modulation created at RPC "Istok".  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME009  
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WEPME010 Implementation of Single Klystron Working Mode at the ALBA Linac linac, booster, operation, synchrotron 2276
 
  • R. Muñoz Horta, J.M. Gómez Cordero, F. Pérez
    CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
 
  ALBA is a third generation synchrotron light source whose injector consists of a 100 MeV Linac and a Booster that accelerates the beam up to the full energy, 3 GeV. Two pulsed klystrons are used to feed the Linac cavities. Klystron 1 feeds the bunching section and also the first accelerating structure. Klystron 2 feeds exclusively the second accelerating structure. Recently, a S-band switching system installed in the waveguide system allows us to use also Klystron 2 to power the low-energy section and operate the Linac at lower energy, around 65 MeV. So that injection into the Booster is still possible while, in the meantime, Klystron 1 can be connected to a dummy load for reparation. Therefore, the time response after a klystron failure is improved. Details of the waveguide upgrade and the results of the ALBA Linac operated with only one klystron are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME010  
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WEPME016 Experience Operating an X-band High-Power Test Stand at CERN network, controls, vacuum, LLRF 2288
 
  • W. Wuensch, N. Catalán Lasheras, A. Degiovanni, S. Döbert, W. Farabolini, J.W. Kovermann, G. McMonagle, S.F. Rey, I. Syratchev, L. Timeo
    CERN, Geneva, Switzerland
  • J. Tagg
    National Instruments Switzerland, Ennetbaden, Switzerland
  • B.J. Woolley
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
 
  CERN has constructed and is operating a klystron-based X-band test stand, called Xbox-1, dedicated to the high-gradient testing of prototype accelerating structures for CLIC and other applications such as FELs. The test stand has now been in operation for a year and significant progress has been made in understanding the system, improving its reliability, upgrading hardware and implementing automatic algorithms for conditioning the accelerating structures. This experience is reviewed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME016  
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WEPME021 Solid-state Pulsed Klystron Transmitters high-voltage, operation, power-supply, flattop 2300
 
  • K. Schrock, C. Chipman, M.P.J. Gaudreau, B.E. Simpson
    Diversified Technologies, Inc., Bedford, Massachusetts, USA
 
  Funding: Lawrence Berkeley National Laboratory Daresbury Laboratory
Diversified Technologies, Inc. (DTI) is currently building and will deliver in early 2014 two solid-state pulsed klystron transmitters. Though not identical, the units are similar in design, and will be delivered to Lawrence Berkeley National Laboratory (LBNL) and Daresbury Laboratory in England. DTI’s goal across these two projects is to develop a complete package which can subsequently be marketed in the high peak power laboratory transmitter market. The modulator is a pulse transformer-coupled hybrid system, including ancillary klystron components (i.e., focus coil, socket) but not the actual klystron tube. Both systems employ a relatively simple modulator, consisting of an energy storage capacitor, a high voltage series switch, a step-up pulse transformer, and a passive pulse-flattening circuit. This arrangement gives an extremely flat pulse and allows the use of a moderate value of storage capacitor. The DTI switch can open or close as commanded, so the pulse width is adjusted by the gate pulse to the system.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME021  
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WEPME065 European XFEL RF Gun Commissioning and LLRF Linac Installation LLRF, gun, linac, cryomodule 2427
 
  • J. Branlard, G. Ayvazyan, V. Ayvazyan, L. Butkowski, M.K. Grecki, M. Hoffmann, F. Ludwig, U. Mavrič, S. Pfeiffer, H. Schlarb, Ch. Schmidt, H.C. Weddig, B.Y. Yang
    DESY, Hamburg, Germany
  • S. Bou Habib, K. Czuba, M. Grzegrzółka, E. Janas, J. Piekarski, I. Rutkowski, R. Rybaniec, D. Sikora, L.Z. Zembala, M. Żukociński
    Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
  • W. Cichalewski, D.R. Makowski, A. Mielczarek, P. Perek, A. Piotrowski, T. Pożniak
    TUL-DMCS, Łódź, Poland
  • S. Korolczuk, I.M. Kudla, J. Szewiński
    NCBJ, Świerk/Otwock, Poland
  • K. Oliwa, W. Wierba
    IFJ-PAN, Kraków, Poland
 
  The European x-ray free electron laser (XFEL) is based on a 17.5 GeV super conducting pulsed linac and is scheduled to deliver its first beam in 2016. The first component of its accelerator chain, the RF gun, was installed in fall of 2013 and its commissioning is underway. This contribution gives an update on the low level radio frequency (LLRF) system development and installation for the XFEL. In particular, the installation, performance and conditioning results of the RF gun are presented. The subsequent steps toward LLRF components mass-production, testing and installation for the XFEL linac are also explained.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME065  
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WEPME066 High Speed Digitial LLRF Feedbacks for Normal Conducting Cavity Operation LLRF, gun, cavity, operation 2430
 
  • M. Hoffmann, L. Butkowski, H. Schlarb, Ch. Schmidt
    DESY, Hamburg, Germany
  • W. Köhler
    DESY Zeuthen, Zeuthen, Germany
  • A. Piotrowski
    TUL-DMCS, Łódź, Poland
  • I. Rutkowski, R. Rybaniec
    Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
 
  In the first half of the year 2014, the MTCA.4 based LLRF control system will be installed at several facilities (FLASH RF Gun, REGAE, PITZ, FLUTE/KIT). First tests during the last year show promising results in optimizing the system for high speed digital llrf feedbacks (reducing system latency, increase internal controller processing speed). In this contribution we will present further improvements in latency and performance optimization of the system, results and gained experience from the commisioning of the system at the metioned facilities.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME066  
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WEPME070 Plans for the Implementation of an Intra-pulse Feedback on the Fermi Linac LLRF System feedback, LLRF, linac, controls 2441
 
  • M. Milloch, A. Fabris, F. Gelmetti, M. Predonzani
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
 
  FERMI 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 1.5 GeV S-band linac is composed of fifteen 3 GHz 45 MW peak RF power plants powering the gun, sixteen accelerating sections and the RF deflectors. The requirements on beam quality impose tight specifications on the stability of the electromagnetic fields that can be achieved only installing high reliable and high performance state of the art LLRF systems. While these requirements are presently met by the system installed, the on-going upgrade of the processing board with the final one will allow to add new functionalities of the system. One of the possible developments is the implementation of an intra-pulse feedback that will allow to apply the corrections inside the RF pulse. This paper provides an overview of the additional benefits that could be achieved and discusses the requirements and the constraints for the implementation in the machine.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME070  
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WEPME071 Development and Construction Status of New LLRF Control System for SuperKEKB controls, cavity, LLRF, FPGA 2444
 
  • T. Kobayashi, K. Akai, K. Ebihara, A. Kabe, K. Nakanishi, M. Nishiwaki, J.-I. Odagiri
    KEK, Ibaraki, Japan
  • H. Deguchi, K. Hayashi, T. Iwaki, M. Ryoshi
    Mitsubishi Electric TOKKI Systems, Amagasaki, Hyogo, Japan
 
  Beam commissioning of the SuperKEKB will be started in 2015. A new LLRF control system, which is an FPGA-based digital RF feedback control system on the MicroTCA platform, has been developed to satisfy the requirement for high current beam operation of the SuperKEKB. Then final refinements were applied, and now the quantity production is in progress. As a new function, klystron phase lock loop was additionally implemented within the cavity feedback control loop in the FPGA, and it was successfully worked in the low-level operation test. For the SuperKEKB, damping ring (DR) is required for the positron injection. Therefore another new LLRF control system is under development for the DR-RF system. It is operated at the same RF-frequency as the main ring, and vector sum control of three cavities is needed in the DR-LLRF control. In this report, the development status and progress from the previous report will be presented including the RF reference distribution system.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME071  
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WEPME078 Experimental Test of the Prototype LLRF Systems for PAL-XFEL LLRF, target, feedback, impedance 2462
 
  • J. Hu, H. Heo, J.H. Hong, W.H. Hwang, H.-S. Kang, H.-S. Lee, C.-K. Min
    PAL, Pohang, Kyungbuk, Republic of Korea
 
  Two prototype LLRF systems were developed in collaboration with Pohang Accelerator Laboratory(PAL) and domestic companies. They are focused on the control of single klystron system to obtain mainly analogue performance. The low power test of the developed LLRF showed good performance previously. We experimentally tested LLRF in the klystron systems to see performance in the high power situation. They showed performance around the prototype specification for short time and relatively long time. During test some bugs are discovered and fixed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME078  
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WEPRI072 High Power Co-axial Couplers for SRF Cavities Windows, SRF, simulation, network 2657
 
  • J. Guo, J. Henry, R.A. Rimmer, H. Wang, R.S. Williams
    JLab, Newport News, Virginia, USA
  • A. Dudas, M.L. Neubauer
    Muons, Inc, Illinois, USA
 
  Funding: Work supported by Dept. of Energy grant no. DE-SC0002769
High Power RF couplers are required in a wide range of accelerator projects using superconducting RF cavities. We have proposed a novel robust coax SRF coupler design using two pre-stressed disc windows without the need of additional matching elements. The matching frequency and the power handling capacity can be easily scaled by changing the diameter and the spacing of the windows. In this paper, we will present our latest progress in the fabrication and the testing of the windows.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI072  
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THPPA02 Gersch Budker Prize Presentation collider, linear-collider, electron, FEL 2846
 
  • T. Shintake
    OIST, Onna-son, Okinawa, Japan
 
  SACLA: SPring-8 Angstrom Compact free-electron Laser, previously called XFEL/SPring-8, which is based on electron accelerator technology developed at SCSS project, in which C-band high gradient linear accelerator provides stable driving beams. Looking back upon 20 years R&D on C-band accelerator, I would like to give some advises to young scientists on doing research. The developed C-band accelerator is now providing 8 GeV electron beams at SACLA X-ray FEL in daily operation with the world best energy stability among these large scale machines.  
slides icon Slides THPPA02 [17.649 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPPA02  
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THPRO019 Current Status of PAL-XFEL Project undulator, linac, quadrupole, cavity 2897
 
  • H.-S. Kang, K.W. Kim, I.S. Ko
    PAL, Pohang, Kyungbuk, Republic of Korea
 
  The PAL-XFEL, a 0.1-nm hard X-ray FEL facility consisting of a 10-GeV S-band linac, is being constructed in Pohang, South Korea. The installation of linac, undulator, and beam line will be completed by 2015. Its building construction is at its peak moment to be completed by December 2014. The major procurement contract was made in 2013 for the critical components of S-band linac modules and hard X-ray undulators. The commissioning will start in January 2016. We hope the first lasing will be achieved in early 2016.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO019  
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THPRO021 Results Produced after Measuring PAL-ITF Beam Diagnostic Instruments pick-up, diagnostics, controls, laser 2903
 
  • H. J. Choi, M.S. Chae, J.H. Hong, H.-S. Kang, S.J. Park
    PAL, Pohang, Kyungbuk, Republic of Korea
 
  Pohang Accelerator Laboratory (PAL) built a PAL-ITF at the end of 2012 to successfully complete PAL-XFEL in 2015. The PAL-ITF is equipped with various kinds of diagnostic equipment to produce high-quality electron bunches. An ICT and a Turbo-ICT were installed in the PAL-ITF. A Faraday Cup is installed at the end of the linear accelerator. These days, the quantity of electric charge occasionally is measured using a BPM Sum value. This paper focuses on the processes and results of electric charge quantity measurements using ICT, Turbo-ICT, FC and BPM. The PAL-ITF is equipped with Stripline-BPM. It is important to find a way to minimize measurement errors that can appear in the process of installing or measuring the BPM. For this, PAL-ITF separately measured the BPM electrode sensitivity and minimized BPM measurement errors through generally calibrating BPM devices by applying Lambertson's Method. A plan was made to minimize BPM measurement errors through applying the BPM electrical calibration method for BPM devices to be used by the PAL-XFEL. This paper examines the processes for checking the performance of the S-BPM installed in the PAL-ITF and the results of its measurements.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO021  
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THPRO025 Conceptual Design of a X-FEL Facility using CLIC X-band Accelerating Structure linac, FEL, simulation, gun 2914
 
  • A.A. Aksoy, O. Yavaş
    Ankara University, Accelerator Technologies Institute, Golbasi / Ankara, Turkey
  • D. Angal-Kalinin, J.A. Clarke
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • M.J. Boland
    SLSA, Clayton, Australia
  • G. D'Auria, S. Di Mitri, C. Serpico
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • M. Doğan
    Dogus University, Istanbul, Turkey
  • T.J.C. Ekelöf, R.J.M.Y. Ruber, V.G. Ziemann
    Uppsala University, Uppsala, Sweden
  • W. Fang, Q. Gu
    SINAP, Shanghai, People's Republic of China
  • A. Latina, D. Schulte, S. Stapnes, I. Syratchev, W. Wuensch
    CERN, Geneva, Switzerland
  • Z. Nergiz
    Nigde University, Nigde University Science & Art Faculty, Nigde, Turkey
 
  Within last decade a linear accelerating structure with an average loaded gradient of 100 MV/m at 12 GHz has been demonstrated in the CLIC study. Recently, it has been proposed to use the CLIC structure to drive an FEL linac. In contrast to CLIC the linac would be powered by klystrons not by a drive beam. The main advantage of this proposal is achieving the required energies in a very short distance, thus the facility would be rather compact. In this study, we present the conceptual design parameters of a facility which could generate laser photon pulses covering the range of 1-75 Angstrom. Shorter wavelengths could also be reached with slightly increasing the energy.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO025  
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THPME171 General-purpose Spectrometer for Vacuum Breakdown Diagnostics for the 12 GHz Test Stand at CERN electron, vacuum, simulation, diagnostics 3668
 
  • M. Jacewicz, Ch. Borgmann, J. Ögren, R.J.M.Y. Ruber, V.G. Ziemann
    Uppsala University, Uppsala, Sweden
 
  Funding: This work is supported by the grants from the the Swedish Research Council DNR-2011-6305 and DNR-2009-6234.
We discuss a spectrometer to analyze the electrons and ions ejected from a high-gradient CLIC accelerating structure that is installed in the klystron-driven 12 GHz test-stand at CERN. The charged particles escaping the structure provide useful information about the physics of the vacuum breakdown within a single RF pulse. The spectrometer consists of a dipole magnet, a pepper-pot collimator, a fluorescent screen and a fast camera. This enables us to detect both transverse parameters such as the emittance and longitudinal parameters such as the energy distribution of the ejected beams. We can correlate these measurements with e.g. the location of the breakdown inside the structure, by using information from the measured RF powers, giving in that way a complete picture of the vacuum breakdown phenomenon. The spectrometer was installed during Spring 2014 and will be commissioned during Summer 2014.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME171  
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THPRI031 Design and Commissioning of S-Band RF Station for AREAL Test Facility gun, electron, LLRF, operation 3834
 
  • A. Vardanyan, H. Avdishyan, H. Davtyan, B. Grigoryan, L.H. Hakobyan, H. Poladyan
    CANDLE SRI, Yerevan, Armenia
 
  The RF station has been designed and constructed for AREAL Linac. The constructional features and commissioning results of RF system are presented. The whole RF system is designed to work at 3GHz frequency. The linac includes an electron gun for 0.5-8 ps electron bunch production with 1-10 Hz repetition rate. For linac RF control system a Libera LLRF stabilization system is used. An important feature of the presented system is a high level synchronization of amplitude-phase characteristics which provide the required accuracy for particle acceleration and bunch formation.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI031  
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THPRI041 Twenty Years of Operation of the Elettra RF System operation, cavity, storage-ring, booster 3853
 
  • C. P. Pasotti, M. Bocciai, P. Pittana, M. Rinaldi
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
 
  Six thousand hours per year is the typical running scheduled time of the user-dedicated Elettra facility and twenty years is a significant amount of operating hours for the RF system. Failure and weak points of the installed equipment is discussed as well as the up-time statistic. The effectiveness of the predictive versus the extraordinary maintenance is presented. The gained operational experience has allowed the planning of the priorities to refit the installed components within a reasonable budget, in compliance with the user-operation time schedule and following the technical need of upgrading to improve the RF system performance.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI041  
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THPRI044 Vacuum Waveguide System for SPring-8 Linac Injector Section vacuum, linac, electron, operation 3863
 
  • T. Taniuchi, H. Dewa, H. Hanaki, T. Kobayashi, T. Magome, A. Mizuno, S. Suzuki, K. Yanagida
    JASRI/SPring-8, Hyogo-ken, Japan
 
  An SF6 waveguide system for the injector section of SPring-8 linac has been replaced in a vacuum waveguide system including a newly developed vacuum circulator and an isolator. This paper describes developed RF components, a waveguide configuration and an RF conditioning of the system.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI044  
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THPRI058 RF Delivery System for FETS rfq, rf-amplifier, quadrupole, simulation 3902
 
  • S.M.H. Alsari, M. Aslaninejad, J.K. Pozimski, P. Savage
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • M. Dudman, A.P. Letchford
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
 
  The Front End Test Stand (FETS) is an experiment based at the Rutherford Appleton Laboratory (RAL) in the UK. In this experiment, the first stages necessary to produce a very high quality, chopped H ion beam as required for the next generation of high power proton accelerators (HPPAs) are designed, built and tested. HPPAs with beam powers in the megawatt range have many possible applications including drivers for spallation neutron sources, neutrino factories, accelerator driven sub-critical systems, waste transmuters and tritium production facilities. An RF system outline, circulator high power tests, RF amplifiers tests, waveguide run with shielding and couplers design are presented and discussed in this paper. Experimental measurements of the system’s circulator and RF Amplifiers high power test will be presented as part of the system testing results.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI058  
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THPRI078 Experimental Study of Surface RF Magnetic Field Enhancement Caused by Closely Spaced Protrusions cavity, vacuum, superconductivity, experiment 3949
 
  • F.Y. Wang, C. Adolphsen, J.P. Eichner, C.D. Nantista, L. Xiao
    SLAC, Menlo Park, California, USA
 
  The RF magnetic field enhancement between two closely spaced protrusions on a metallic surface has been studied theoretically. It is found that a large enhancement occurs when the field is perpendicular to the gap between the protrusions. This mechanism could help explain the melting that has been observed on cavity surfaces subjected to pulsed heating that would nominally be well below the melting temperature of the surface material. To test this possibility, an experiment was carried out in which a pair of copper “pins” was attached to the base plate of an X-band cavity normally used to study pulsed heating. Melting was observed between the pins when the predicted peak temperature was near or exceeded the copper melting temperature.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI078  
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THPRI079 RF BREAKDOWN IN A GAS-FILLED TE01 CAVITY cavity, plasma, electron, simulation 3952
 
  • F.Y. Wang, C. Adolphsen, C.D. Nantista
    SLAC, Menlo Park, California, USA
 
  An L-band (1.3 GHz) TE01 mode pillbox cavity has been designed to study rf breakdown in gas. Since there are no surface electric fields, effects from the electron interaction with the surface should not be present as in the DC breakdown case. A CCD camera was used to measure the integrated light pattern through holes in the cavity, and an ultrafast diode was used to observed the evolution of the plasma during breakdown. Some preliminary results of the tests are presented in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI079  
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THPRI100 Distributed Cooling System for the AREAL Test Facility gun, electron, operation, controls 4010
 
  • V. V. Vardanyan, G.A. Amatuni, V.S. Avagyan, A.A. Gevorgyan, B. Grigoryan, T.H. Mkrtchyan, V. Sahakyan, A.S. Simonyan, A.V. Tsakanian, A. Vardanyan
    CANDLE SRI, Yerevan, Armenia
 
  Following the design specifications of the Advanced Research Electron Accelerator Laboratory (AREAL), a reliable distributed cooling system for the AREAL linear accelerator has been developed. The cooling system provides a high accuracy temperature control for the electron gun, klystron and the magnets. The main requirements and technical solutions for various accelerator components cooling units are presented, including the local and remote control.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI100  
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FRXAB01 Trends in RF Technology for Applications to Light Sources with Great Average Power operation, rf-amplifier, high-voltage, power-supply 4065
 
  • Ch. Wang
    NSRRC, Hsinchu, Taiwan
 
  RF systems are a major part of both the capital and operating costs of contemporary light sources and directly impact their capability, reliability and availability. The RF community has been discussing for many years the best choice of CW RF power source for light sources. In the domain of great average power, the choice is among a klystron, inductive-output tube, and solid-state RF amplifier. Here we review their current development and challenges and offer a perspective from a point of view of operating a light source with high reliability and availability.  
slides icon Slides FRXAB01 [4.033 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-FRXAB01  
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