Keyword: linac
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MOCOXBS02 ERL Operation of S-DALINAC* operation, cavity, beam-loading, MMI 1
 
  • M. Arnold, T. Bahlo, M. Dutine, R. Grewe, J.H. Hanten, L.E. Jürgensen, J. Pforr, N. Pietralla, F. Schließmann, M. Steinhorst, S. Weih
    TU Darmstadt, Darmstadt, Germany
 
  Funding: *Work supported by DFG through GRK 2128
The S-DALINAC is a superconducting electron accelerator operated at TU Darmstadt. It is running in recirculating operation since 1991. An upgrade done in the years 2015/2016 enables to use the S-DALINAC as an energy-recovery linac (ERL) [1]. The lattice is capable of a once- (up to 34 MeV) or twice-recirculating ERL operation (up to 68 MeV). For both modes dedicated beam dynamics simulations have been conducted. An important aspect is the effect of phase slippage and its influence on the quality of the decelerated beam. Furthermore, investigations regarding specialized diagnostic systems are currently ongoing. This is of great importance especially for the twice-recirculating ERL, where two beams of the same energy are transported through the same beam line. The commissioning of the different ERL modes started in 2017 and will be continued during upcoming beam times. This contribution will give an overview on the ERL modes at S-DALINAC. The beam dynamics simulations as well as diagnostics used will be discussed. Results and operational findings of the different ERL runs will be presented.
[1] N. Pietralla, Nuclear Physics News, Vol. 28, No. 2, (2018) 4.
 
slides icon Slides MOCOXBS02 [3.807 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-MOCOXBS02  
About • paper received ※ 15 September 2019       paper accepted ※ 31 October 2019       issue date ※ 24 June 2020  
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MOCOXBS04 The Berlin Energy Recovery Linac Project BERLinPro - Status, Plans and Future Opportunities cavity, gun, operation, cathode 8
 
  • M. Abo-Bakr, N. Al-Saokal, W. Anders, Y. Bergmann, K. Bürkmann-Gehrlein, A. Bundels, A.B. Büchel, P. Echevarria, A. Frahm, H.-W. Glock, F. Glöckner, F. Göbel, S. Heling, J.G. Hwang, A. Jankowiak, C. Kalus, T. Kamps, G. Klemz, J. Knobloch, J. Kolbe, J. Kühn, B.C. Kuske, J. Kuszynski, A.N. Matveenko, M. McAteer, A. Meseck, S. Mistry, R. Müller, A. Neumann, N. Ohm, K. Ott, F. Pflocksch, L. Pichl, J. Rahn, O. Schüler, M. Schuster, Y. Tamashevich, J. Ullrich, A. Ushakov, J. Völker
    HZB, Berlin, Germany
  • H. Huck
    DESY Zeuthen, Zeuthen, Germany
 
  Funding: Work supported by the German Bundesministerium für Bildung und Forschung, Land Berlin and grants of Helmholtz Association
The Helmholtz-Zentrum Berlin is constructing the Energy Recovery Linac Prototype BERLinPro, a SRF based demonstration facility for the science and technology of ERLs for future high power, high brilliance electron beam applications. BERLinPro was designed to accelerate a high current (100 mA, 50 MeV), high brilliance (norm. emittance below 1 mm mrad) cw electron beam. Given the recent prioritization of the BESSY II upgrade to the BESSY VSR variable pulse length storage ring, HZB is forced to reduce the project goals of BERLinPro. As a result, the project had to be rescoped with the goal to maximize its scientific impact within the present boundary conditions. We report on the last year’s progress of the building, the warm and cold infrastructure and on the time line, goals nd opportunities for the remaining project run time.
 
slides icon Slides MOCOXBS04 [13.980 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-MOCOXBS04  
About • paper received ※ 16 September 2019       paper accepted ※ 06 November 2019       issue date ※ 24 June 2020  
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MOCOXBS05 Status of the MESA ERL Project experiment, electron, cavity, MMI 14
 
  • F. Hug, K. Aulenbacher, R.G. Heine, D. Simon
    KPH, Mainz, Germany
  • K. Aulenbacher
    GSI, Darmstadt, Germany
  • K. Aulenbacher, S. Friederich
    HIM, Mainz, Germany
  • S. Friederich, P. Heil, R.F.K. Kempf, C. Matejcek
    IKP, Mainz, Germany
 
  Funding: This work has been supported by DFG through the PRISMA+ cluster of excellence EXC 2118/2019 and by the European Union’s Horizon 2020 Research and Innovation programme under Grant Agreement No 730871.
MESA is a recirculating superconducting accelerator under construction at Johannes Gutenberg-Universität Mainz. It can be operated in either external beam or ERL mode and will be used for high precision particle physics experiments. The operating beam current and energy in EB mode is 0.15 mA with polarized electrons at 155 MeV. In ERL mode a polarized beam of 1 mA at 105 MeV will be available. In a later construction stage of MESA the beam current in ERL-mode shall be upgraded to 10 mA (unpolarized). Civil construction and commissioning of components like electron gun, LEBT and SRF modules have been started already. We will give a project overview including the accelerator layout, the current status and an outlook to the next construction and commissioning steps.
 
slides icon Slides MOCOXBS05 [14.029 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-MOCOXBS05  
About • paper received ※ 14 September 2019       paper accepted ※ 06 November 2019       issue date ※ 24 June 2020  
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TUCOXBS01 Beam Halo in Energy Recovery Linacs operation, emittance, collimation, electron 23
 
  • O.A. Tanaka
    KEK, Ibaraki, Japan
 
  The beam halo mitigation is a very important challenge for reliable and safe operation of a high energy machine. Since Energy Recovery Linacs (ERLs) are known to produce high energy electron beams of high virtual power and high density, the beam halo and related beam losses should be properly mitigated to avoid a direct damage of the equipment, an unacceptable increase in the vacuum pressure, a radiation activation of the accelerator components etc. To keep the operation stable, one needs to address all possible beam halo formation mechanisms, including those unique to each machine that can generate beam halo. Present report is dedicated to the beam halo related activities at the Compact ERL at KEK, and our operational experience with respect to the beam halo.  
slides icon Slides TUCOXBS01 [4.480 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-TUCOXBS01  
About • paper received ※ 16 September 2019       paper accepted ※ 01 November 2019       issue date ※ 24 June 2020  
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TUCOXBS03 Beam Dynamics Layout of the MESA ERL experiment, operation, acceleration, electron 28
 
  • F. Hug, K. Aulenbacher, D. Simon, C.P. Stoll, S.D.W. Thomas
    KPH, Mainz, Germany
  • K. Aulenbacher
    GSI, Darmstadt, Germany
  • K. Aulenbacher
    HIM, Mainz, Germany
 
  Funding: This work has been supported by DFG through the PRISMA+ cluster of excellence EXC 2118/2019 and by the European Union’s Horizon 2020 Research and Innovation programme under Grant Agreement No 730871.
The MESA project is currently under construction at Johannes Gutenberg-Universität Mainz. It will be used for high precision particle physics experiments in two different operation modes: external beam (EB) mode (0.15 mA; 155 MeV) and energy recovery (ERL) mode (1 mA; 105 MeV). The recirculating main linac follows the concept of a double sided accelerator design with vertical stacking of return arcs. Up to three recirculations are possible. Acceleration is done by four TESLA/XFEL 9-cell SRF cavities located in two modified ELBE cryomodules. Within this contribution the recirculation optics for MESA will be presented. Main goals are achieving best energy spread at the experimental setups in recirculating ERL and non-ERL operation and providing small beta-functions within the cryomodules for minimizing HOM excitation at high beam currents.
 
slides icon Slides TUCOXBS03 [5.077 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-TUCOXBS03  
About • paper received ※ 16 September 2019       paper accepted ※ 06 November 2019       issue date ※ 24 June 2020  
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TUCOXBS04 The LHeC ERL - Optics and Performance Optimizations optics, cavity, emittance, lattice 34
 
  • S.A. Bogacz
    JLab, Newport News, Virginia, USA
 
  Funding: Work has been authored by Jefferson Science Associates, LLC under Contract No. DE-AC05-06OR23177 with the U.S. Department of Energy.
The LHeC 60 GeV ERL baseline design features a racetrack composed of two linacs, completed with 6 return arcs, including vertical spreaders and recombines at the arcs ends. Here, we consider a design strategy aiming at ’downsizing’ the ERL e.g. to 50 GeV, while preserving its performance in terms of synchrotron radiation effects. This results in a significant reduction of accelerator components. The optimization explores tuning of each arc, which takes into account the impact of synchrotron radiation at different energies. At the highest energy, it is crucial to minimize the emittance dilution; therefore, the cells are tuned to minimize the dispersion in the bending sections, as in a theoretical minimum emittance lattice. At the lowest energy, one compensates for the bunch elongation with a negative momentum compaction setup which, additionally, contains the beam size. The intermediate energy arcs are tuned to a double bend achromat lattice, offering a compromise between isochronicity and emittance dilution. Finally, a feasibility of a ’dogbone’ ERL is discussed.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-TUCOXBS04  
About • paper received ※ 16 September 2019       paper accepted ※ 07 November 2019       issue date ※ 24 June 2020  
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TUCOXBS05 Beam Timing and Cavity Phasing cavity, acceleration, target, injection 39
 
  • R.M. Koscica, N. Banerjee, G.H. Hoffstaetter, W. Lou, G.T. Premawardhana
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
 
  In a multi-pass Energy Recovery Linac (ERL), each cavity must regain all energy expended from beam acceleration during beam deceleration. The beam should also achieve specific energy targets during each loop that returns it to the linac. To satisfy the energy recovery and loop requirements, one must specify the phase and voltage of cavity fields, and one must control the beam flight times through the return loops. Adequate values for these parameters can be found by using a full scale numerical optimization program. If symmetry is imposed in beam time and energy during acceleration and deceleration, the number of parameters needed decreases, simplifying the optimization. As an example, symmetric models of the Cornell BNL ERL Test Accelerator (CBETA) are considered. Energy recovery results from recent CBETA single-turn tests are presented, as well as multi-turn solutions that satisfy CBETA optimization targets of loop energy and zero cavity loading.  
slides icon Slides TUCOXBS05 [5.186 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-TUCOXBS05  
About • paper received ※ 13 September 2019       paper accepted ※ 01 November 2019       issue date ※ 24 June 2020  
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TUCOZBS02 A Ferroelectric Fast Reactive Tuner (FE-FRT) to Combat Microphonics cavity, SRF, operation, impedance 42
 
  • N.C. Shipman, J. Bastard, M.R. Coly, F. Gerigk, A. Macpherson, N. Stapley
    CERN, Geneva, Switzerland
  • I. Ben-Zvi
    BNL, Upton, New York, USA
  • G. Burt, A. Castilla
    Lancaster University, Lancaster, United Kingdom
  • C.-J. Jing, A. Kanareykin
    Euclid TechLabs, LLC, Solon, Ohio, USA
  • E. Nenasheva
    Ceramics Ltd., St. Petersburg, Russia
 
  A prototype Fast Reactive Tuner (FRT) for superconducting cavities has been developed, which allows the frequency to be controlled by application of a potential difference across a newly developed ultra-low loss ferro-electric material residing within the tuner. The tuner operates at room temperature, outside of the cryostat and coupled to the cavity via an antenna and co-axial cable. This technique allows for active compensation of microphonics, eliminating the need to design over-coupled fundamental power couplers and thus significantly reducing RF power particularly for low beam current applications. Modelling; simulation; and stability analysis, of the tuner; cavity; measurement system; and feedback loop, have been performed in the frequency and time domain, and are compared to the latest experimental results. The potential benefits of applying this techniques to ERLs, which are seen as one of the major use cases, are detailed both in general and with regards to specific projects. Ideas and designs for an improved next generation FRT are also discussed.  
slides icon Slides TUCOZBS02 [5.607 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-TUCOZBS02  
About • paper received ※ 17 September 2019       paper accepted ※ 06 November 2019       issue date ※ 24 June 2020  
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TUCOZBS04 Characterization of Microphonics in the cERL Main Linac Superconducting Cavities cavity, controls, LLRF, operation 48
 
  • F. Qiu, D.A. Arakawa, M. Egi, E. Kako, H. Katagiri, T. Konomi, T. Matsumoto, S. Michizono, T. Miura, H. Sakai, K. Umemori
    KEK, Ibaraki, Japan
  • M. Egi, S. Michizono
    Sokendai - Hayama, Hayama, Japan
  • E. Kako, T. Konomi, T. Matsumoto, T. Miura, F. Qiu, H. Sakai, K. Umemori
    Sokendai, Ibaraki, Japan
 
  In the main linac (ML) of the KEK-cERL, two superconducting cavities with high loaded Q (QL ¿ 1×107) are operated in continuous wave (CW) mode. It is important to control and suppress the microphonics detuning owing to the low bandwidth of the cavities. We evaluated the background microphonics detuning by the low level radio frequency system during the beam operation. Interestingly, a ¿field level dependence microphonics¿ phenomenon was observed on one of the cavities in the ML. Several frequency components were suddenly excited if the cavity field is above a threshold field (~3 MV/m). We found that this threshold field is probably related with the cavity quench limits despite the unclear inherent physical mechanism. Furthermore, in order to optimize the cavity resonance control system for better microphonics rejection, we have measured the mechanical transfer function between the fast piezo tuner and cavity detuning. Finally, we validated this model by comparing the model response with actual system response.  
slides icon Slides TUCOZBS04 [7.564 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-TUCOZBS04  
About • paper received ※ 13 September 2019       paper accepted ※ 01 November 2019       issue date ※ 24 June 2020  
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TUCOZBS05 Low Level RF ERL Experience at the S-DALINAC* cavity, operation, controls, beam-loading 52
 
  • M. Steinhorst, M. Arnold, T. Bahlo, R. Grewe, L.E. Jürgensen, J. Pforr, N. Pietralla, F. Schließmann, S. Weih
    TU Darmstadt, Darmstadt, Germany
 
  Funding: *Supported by the DFG through GRK 2128.
The recirculating superconducting Darmstadt linear accelerator S-DALINAC [1] is one of the main research instruments at the institute for nuclear physics at the TU Darmstadt. It is operating in cw mode at beam currents of up to 20 uA with energies of up to 130 MeV using a thrice recirculating scheme. In 2010 the present digital low-level rf (LLRF) control system was set into operation. Since 2017 the S-DALINAC can be used as an energy recovery linac (ERL). The ERL mode is adjusted by shifting the phase of the beam by 180° in the second recirculation. The current setup of the LLRF control system is not optimized for the usage in an ERL operation. Therefore investigations in regard of the rf control performance have to be done. The first successful one turn ERL operation was set up in August 2017 where the rf control performance was investigated the first time in this new mode. In this talk the LLRF control system of the S-DALINAC is presented and its perfomance during an ERL operation is discussed.
*[1] N. Pietralla, Nucl. Phys. News 28 No. 2, 4 (2018).
 
slides icon Slides TUCOZBS05 [26.760 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-TUCOZBS05  
About • paper received ※ 13 September 2019       paper accepted ※ 01 November 2019       issue date ※ 24 June 2020  
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WEPNEC01 Status and Future Perspective of the TRIUMF E-Linac electron, radiation, MMI, gun 70
 
  • S.D. Rädel, M. Alcorta, F. Ames, E. Chapman, K. Fong, B. Humphries, O.K. Kester, D. Kishi, S.R. Koscielniak, R.E. Laxdal, Y. Ma, T. Planche, M. Rowe, V.A. Verzilov
    TRIUMF, Vancouver, Canada
 
  The currently installed configuration of TRIUMF’s superconducting electron linac (e-linac) can produce an electron beam up to 30MeV and 10mA. Low beam power commissioning of the segment spanning the electron gun to high energy dump took place in summer 2018 with an attained beam energy of 25MeV. As the driver of the ARIEL project, the e-linac will deliver electrons to a photo-converter target station for the production of neutron-rich rare isotope beams (RIB) via photo fission. The e-linac will have sufficient beam power to support the demands of other user community rare isotope beams. This driver accelerator could server as a production machine for high field THz radiation and as irradiation center. A recirculation of the beam would be beneficial for RIB production at higher beam energy and would allow for high bunch compression to generate THz radiation. Such a system would also allow for the investigation of a high beam intensity energy recovery linac. To this end, TRIUMF is investigating the design of such a recirculation and the beam dynamics as a first step.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-WEPNEC01  
About • paper received ※ 01 October 2019       paper accepted ※ 01 November 2019       issue date ※ 24 June 2020  
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WEPNEC10 Investigation on the Ion Clearing of Multi-Purpose Electrodes of BERLinPro simulation, electron, brightness, emittance 80
 
  • G. Pöplau
    COMPAEC e.G., Rostock, Germany
  • A. Meseck
    KPH, Mainz, Germany
  • A. Meseck
    HZB, Berlin, Germany
 
  High-brightness electron beams provided by modern accelerators require several measures to preserve their high quality and to avoid instabilities. The mitigation of the impact of residual ions is one of these measures. It is particularly important if high bunch charges in combination with high repetition rates are aimed for. This is because ions can be trapped in the strong negative electrical potential of the electron beam causing emittance blow-up, increased beam halo and longitudinal and transverse instabilities. One ion-clearing strategy is the installation of clearing electrodes. Of particular interest in this context is the performance of multi-purpose electrodes, which are designed such that they allow for a simultaneous ion-clearing and beam-position monitoring. Such electrodes will be installed in the BERLinPro facility. In this contribution, we present numerical studies of the performance of multi-purpose clearing-electrodes planned for BERLinPro, i.e. we investigate the behavior of ions generated by electron bunches while passing through the field of the electrodes. Hereby, several ion species and configurations of electrodes are considered.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-WEPNEC10  
About • paper received ※ 11 October 2019       paper accepted ※ 06 November 2019       issue date ※ 24 June 2020  
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WEPNEC11 X-Ray ICS Source Based on Modified Push-Pull ERLs cavity, electron, photon, radiation 84
 
  • I. Drebot, A. Bacci, S. Cialdi, L. Faillace, D. Giannotti, M. Rossetti Conti, A.R. Rossi, L. Serafini, M. Statera, V. Torri
    INFN-Milano, Milano, Italy
  • A. Bosotti, F. Broggi, D. Giove, P. Michelato, L. Monaco, R. Paparella, D. Sertore
    INFN/LASA, Segrate (MI), Italy
  • P. Cardarelli, M. Gambaccini, G. Paternò, A. Taibi
    INFN-Ferrara, Ferrara, Italy
  • A. Esposito, A. Gallo, C. Vaccarezza
    INFN/LNF, Frascati, Italy
  • G. Galzerano
    POLIMI, Milano, Italy
  • M. Gambaccini
    UNIFE, Ferrara, Italy
  • G. Mettivier, P. Russo
    UniNa, Napoli, Italy
  • V. Petrillo, F. Prelz
    Universita’ degli Studi di Milano & INFN, Milano, Italy
  • E. Puppin
    Politecnico/Milano, Milano, Italy
  • A. Sarno
    INFN-Napoli, Napoli, Italy
 
  We present the conceptual designs of BriXS and BriXSino (a minimal test-bench demonstrator of proof of principle) for a compact X-ray Source based on innovative push-pull ERLs. BriXS, the first stage of the Marix project, is a Compton X-ray source based on superconducting cavity technology with energy recirculation and on a laser system in Fabry-Pérot cavity at a repetition rate of 100 MHz, producing 20-180 keV radiation for medical applications. The energy recovery scheme based on a modified folded push-pull CW-SC twin Linac ensemble allows to sustain MW-class beam power with almost just one hundred kW active power dissipation/consumption.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-WEPNEC11  
About • paper received ※ 20 September 2019       paper accepted ※ 06 November 2019       issue date ※ 24 June 2020  
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WEPNEC14 Electromagnetic Design of a Superconducting dual axis Spoke Cavity* cavity, SRF, radiation, acceleration 94
 
  • Ya.V. Shashkov, N.Yu. Samarokov
    MEPhI, Moscow, Russia
  • I.V. Konoplev
    JAI, Oxford, United Kingdom
 
  Funding: The reported study was funded by RFBR according to the research project 18-302-00990
Dual axis superconducting spoke cavity for Energy Recovery Linac application is proposed. Conceptual design of the cavity is shown and preliminary optimiza-tions of the proposed structure have been carried out to minimize the ratio of the peak magnetic and electric fields to the accelerating voltage. The new design and future work are discussed
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-WEPNEC14  
About • paper received ※ 01 October 2019       paper accepted ※ 06 November 2019       issue date ※ 24 June 2020  
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THCOWBS03 System Identification Procedures for Resonance Frequency Control of SC Cavities controls, operation, simulation, cryomodule 129
 
  • S. Orth, H. Klingbeil
    TEMF, TU Darmstadt, Darmstadt, Germany
 
  Funding: Work supported by Deutsche Forschungsgemeinschaft (DFG): GRK 2128 ’AccelencE’
Energy Recovery Linacs promise superior beam quality: sharper and more intense. To reach these goals, resonance frequency control of the superconducting RF cavities is an important part. In this work, system identification procedures conducted at components of the S-DALINAC (Institute for Nuclear Physics, TU Darmstadt, Germany) are shown. This includes investigations of the piezo tuner’s effect on, e.g., the phase of the accelerating field when a periodic disturbance is applied. The results are compared to simulations of the modelled system and the impact of the applied controller is discussed.
 
slides icon Slides THCOWBS03 [0.593 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-THCOWBS03  
About • paper received ※ 17 September 2019       paper accepted ※ 01 November 2019       issue date ※ 24 June 2020  
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FRCOWBS04 Essential Instrumentation for the Characterization of ERL Beams diagnostics, cavity, radiation, operation 150
 
  • N. Banerjee, A.C. Bartnik, K.E. Deitrick, J. Dobbins, C.M. Gulliford, G.H. Hoffstaetter
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • J.S. Berg, S.J. Brooks, R.J. Michnoff
    BNL, Upton, New York, USA
 
  Funding: This work was performed through the support of New York State Energy Research and Development Agency (NYSERDA).
The typical requirement of Energy Recovery Linacs to produce beams with high repetition rate and high bunch charge presents unique demands on beam diagnostics. ERLs being quite sensitive to time of flight effects necessitate the use of beam arrival time monitors along with typical position detection. Being subjected to a plethora of dynamic effects, both longitudinal and transverse phase space monitoring of the beam becomes quite important. Additionally, beam halo plays an important role determining the overall transmission. Consequently, we also need to characterize halo both directly using sophisticated beam viewers and indirectly using radiation monitors. In this talk, I will describe the instrumentation essential to ERL operation using the Cornell-BNL ERL Test Accelerator (CBETA) as a pertinent example.
 
slides icon Slides FRCOWBS04 [7.129 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-FRCOWBS04  
About • paper received ※ 19 September 2019       paper accepted ※ 01 November 2019       issue date ※ 24 June 2020  
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FRCOXBS03 Beam Dynamics Simulations for the Twofold ERL Mode at the S-DALINAC* electron, acceleration, GUI, cavity 155
 
  • F. Schließmann, M. Arnold, M. Dutine, J. Pforr, N. Pietralla, M. Steinhorst
    TU Darmstadt, Darmstadt, Germany
 
  Funding: *Work supported by DFG through GRK 2128 and BMBF through grant No. 05H18RDRB2
The recirculating superconducting electron accelerator S-DALINAC [1] at TU Darmstadt is capable to run as a onefold or twofold Energy Recovery Linac (ERL) with a maximum energy of approximately 34 or 68 MeV in ERL mode, respectively. Since the maximum kinetic energy for the twofold ERL mode at injection is less than 8 MeV (v/c<0.9982) and since several multi-cell cavities designed for v/c=1 are used in the main accelerator, the electrons suffer from the effect of phase slippage. Therefore, beam dynamics simulations for the 6D phase space were performed in order to provide a sufficient beam guiding.
[1] N. Pietralla, Nuclear Physics News, Vol. 28, No. 2, 4 (2018).
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-FRCOXBS03  
About • paper received ※ 17 October 2019       paper accepted ※ 01 November 2019       issue date ※ 24 June 2020  
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FRCOXBS04 Status of the Control System for the Energy Recovery Linac BERLinPro at HZB controls, EPICS, laser, operation 159
 
  • T. Birke, P. Echevarria, D. Eichel, R. Fleischhauer, J.G. Hwang, G. Klemz, R. Müller, C. Schröder, E. Suljoti, A. Ushakov
    HZB, Berlin, Germany
 
  BERLinPro is an energy recovery linac (ERL) demonstrator project built at HZB. It features CW SRF technology for the low emittance, high brightness gun, the booster module and the recovery linac. Construction and civil engineering are mostly completed. Synchronized with the device integration the EPICS based control system is being set-up for testing, commissioning and finally operation. In the warm part of the accelerator technology is used that is already operational at BESSY and MLS (e.g. CAN-bus and PLC/OPCUA). New implementations like the machine protection system and novel major subsystems (e.g. LLRF, Cryo-Controls, photo cathode laser) need to be integrated. The first RF transmitters have been tested and commissioned. Around the time of this workshop the first segment of the accelerator is scheduled to become online. For commissioning and operation of the facility the standard set of EPICS tools form the back-bone. A set of generic python applications already developed at BESSY/MLS will be adapted to the specifics of BERLinPro. Scope and current project status are described in this paper.  
slides icon Slides FRCOXBS04 [11.021 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-FRCOXBS04  
About • paper received ※ 05 September 2019       paper accepted ※ 11 November 2019       issue date ※ 24 June 2020  
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FRCOXBS05 Adjusting BERLinPro Optics to Commissioning Needs optics, cathode, bunching, gun 165
 
  • B.C. Kuske, M. McAteer
    HZB, Berlin, Germany
 
  Funding: Work supported by German Bundesministerium für Bildung und Forschung, Land Berlin and grants of Helmholtz Association
BERLinPro is an Energy Recovery Linac (ERL) project currently being set up at HZB, Berlin. During the turn of the project, many adaptations of the optics to changing hardware realities were necessary. To name only one, commissioning of the recirculator will now be realized with the superconducting linac module fabricated for the Mainz ERL project MESA, as the BERLinPro linac is delayed. The Mainz linac will supply roughly 60% of the energy planned for the BERLinPro linac module and will be limited by higher order modes in the cavities to few mA of current. While the adapted optics shows similar parameters as the original 50MeV optics, studies of longitudinal space charge and coherent synchrotron radiation show that the energy leads to large emittance blow up due toμbunching. Furthermore, preparations for commissioning with gun fields much lower than the original 30MV/m in the 1.4 cell SRF gun are introduced and according optics are presented.
 
slides icon Slides FRCOXBS05 [9.766 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-FRCOXBS05  
About • paper received ※ 19 September 2019       paper accepted ※ 04 November 2019       issue date ※ 24 June 2020  
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FRCOYBS01 Working Group Summary: ERL Facilities operation, FEL, electron, gun 171
 
  • M. Abo-Bakr
    HZB, Berlin, Germany
  • M. Arnold
    TU Darmstadt, Darmstadt, Germany
 
  To be added.  
slides icon Slides FRCOYBS01 [4.193 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-FRCOYBS01  
About • paper received ※ 20 September 2019       paper accepted ※ 06 November 2019       issue date ※ 24 June 2020  
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