Keyword: solenoid
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MOPMR001 Micro-mover Development and Test in the PAL-XFEL electron, gun, cavity, controls 229
 
  • B.G. Oh, J.H. Han, H. Heo, J.H. Hong, H.-S. Kang, C. Kim, D.E. Kim, K.-H. Park, Y.J. Suh
    PAL, Pohang, Kyungbuk, Republic of Korea
  
  Two micro-movers, which are able to control the horizontal, vertical and longitudinal positions as well as the yaw and pitch angles remotely, were developed and installed in the PAL-XFEL linac. The solenoid micro-mover in the gun section allows beam-based alignment of an electron beam to the solenoid field and the gun RF field. The X-band cavity micro-mover minimizes the transverse wake field effect caused by transverse misalignment between the beam and X-band cavity. Two micro-movers has similar specifications and the same mechanism, but the sizes are different from each other. In this paper, we present the design, manufacture and test results of the micro-movers.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMR001  
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MOPOY022 Further Upgrade Measures at New GSI cw-Linac Demonstrator Setup cavity, linac, ion, heavy-ion 892
 
  • M. Heilmann, W.A. Barth, S. Mickat, S. Yaramyshev
    GSI, Darmstadt, Germany
  • M. Amberg, M. Basten, F.D. Dziuba, H. Podlech, U. Ratzinger, M. Schwarz
    IAP, Frankfurt am Main, Germany
  • K. Aulenbacher
    IKP, Mainz, Germany
  • K. Aulenbacher, W.A. Barth, V. Gettmann, S. Mickat, M. Miski-Oglu
    HIM, Mainz, Germany
  
  A new continuous wave (cw) linac is required to deliver high intensity heavy ion beams for Super Heavy Element (SHE) future experiments at GSI Darmstadt, Germany. The presented upgrade measures are dedicated to improve the performance of the cw demonstrator setup. The key component is a cryomodule comprising a superconducting (sc) 217 MHz Crossbar-H-mode (CH) cavity surrounded by two sc 9.3T solenoids with compensation coils. The solenoid coil is made of a Nb3Sn wire; and the compensation coils at both ends of the solenoid comprises NbTi wires. The distance between solenoid lense and CH cavity has to be optimized for ideal beam matching as well as for a minimum rest field inside the cavity below the critical magnetic field. The GSI High Charge State (HLI) injector has to deliver a heavy ion beam with an energy of 1.4 MeV/u. Longitudinal matching to the demonstrator is provided by two 108.4 MHz cw room temperature λ/4 re-buncher cavity installed behind the HLI. In this paper electromagnetic simulations of the field optimization for the solenoids and the re-buncher cavities will be presented as well as first beam experiments at the beam transport line to the demonstrator cavity.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY022  
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MOPOY031 Emittance Measurement with Double-Slit Method in CADS Injector-I emittance, rfq, linac, simulation 922
 
  • C. Meng, H. Geng, Z. Xue, F. Yan, L. Yu, Y.L. Zhao
    IHEP, Beijing, People's Republic of China
  
  The C-ADS accelerator is a CW (Continuous-Wave) proton linac with 1.5 GeV in beam energy, 10 mA in beam current, and 15 MW in beam power. CADS Injector-I accelerator is a 10-mA 10-MeV CW proton linac, which uses a 3.2-MeV normal conducting 4-Vane RFQ and superconducting single-spoke cavities for accelerating. The 5MeV test stand of CADS accelerator Injector I is composed of an ion source, a LEBT, a 325MHz RFQ, a MEBT, a cryogenic module (CM1) of seven SC spoke cavities (β=0.12) , seven SC solenoids, seven cold BPMs and a beam dump. Emittance measurement is very important for the understanding of beam behavior and matching to the next accelerating section. Detailed emittance measurement with double-slit method after CM1 are presented in this paper.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY031  
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MOPOY049 The PXIE LEBT Design Choices ion, rfq, ion-source, vacuum 958
 
  • L.R. Prost, A.V. Shemyakin
    Fermilab, Batavia, Illinois, USA
  
  Funding: Operated by Fermi Research Alliance, LLC, under Contract DE-AC02-07CH11359 with the United States Department of Energy
Typical front-ends of modern light-ion high-intensity accelerators typically consist of an ion source, a Low Energy Beam Transport (LEBT), a Radiofrequency Quadrupole and a Medium Energy Beam Transport (MEBT), which is followed by the main linac accelerating structures. Over the years, many LEBTs have been designed, constructed and operated very successfully. In this paper, we present the guiding principles and compromises that lead to the design choices of the PXIE LEBT, including the rationale for a beam line that allows un-neutralized transport over a significant portion of the LEBT whether the beam is pulsed or DC. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY049  
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TUPMB033 Design and Construction of the QC2 Superconducting Magnets in the SuperKEKB IR quadrupole, superconducting-magnet, operation, focusing 1174
 
  • N. Ohuchi, Y. Arimoto, N. Higashi, M. Iwasaki, M.K. Kawai, Y. Kondo, K. Tsuchiya, X. Wang, H. Yamaoka, Z.G. Zong
    KEK, Ibaraki, Japan
  • H.K. Kono, T. Murai, S. Takagi
    Mitsubishi Electric Corp., Energy Systems Centre, Kobe, Japan
  
  SuperKEKB is now being constructed with a target luminosity of 8×1035 which is 40 times higher than the KEKB luminosity. The luminosity can be achieved by the "Nano-Beam" accelerator scheme, in which both beams should be squeezed to about 50 nm at the beam interaction point, IP. The beam final focusing system consists of 8 superconducting quadrupole magnets, 4 superconducting solenoids and 43 superconducting corrector coils. The QC2 magnets are designed to be located in the second closest position from IP as the final beam focusing system of SuperKEKB. The two types of quadrupole magnets have been designed for the electron and positron beam lines. The QC2P for the positron beam is designed to generate the field gradient, G, of 28.1 T/m and the effective magnetic length, L, of 0.4099 m at the current, I, of 877.4 A. The QC2E for the electron beam line is designed to generate G=28.44 T/m and L=0.537 mm, 0.419 mm (for QC2LE, QC2RE) at I=977 A. In the paper, we will present the designs and the constructions of the two types of the quadrupole magnets.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB033  
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TUPMB034 Design and Manufacture of a Superconducting Solenoid for D-Line of J-PARC Muon Facility operation, vacuum, interface, radiation 1177
 
  • T. Semba, Y. Hagiwara, S. Kido, S. Nakajima, Y. Tanaka
    Hitachi Ltd., Ibaraki-ken, Japan
  • N. Kawamura, Y. Makida, Y. Miyake, H. Ohhata, K. Sasaki, K. Shimomura
    KEK, Ibaraki, Japan
  • N. Kurosawa
    KEK, Tokai Branch, Tokai, Naka, Ibaraki, Japan
  • Y. Murata
    Hitachi, Ltd., Energy and Environmental System Laboratory, Hitachi-shi, Japan
  • P. Strasser
    High Energy Accelerator Research Organization (KEK), Institute of Materials Structure Science (IMSS), Ibaraki, Japan
  
  A superconducting solenoid for J-PARC muon facility was newly designed and manufactured. High Energy Accelerator Research Organization (KEK) has been operating the J-PARC Muon Science Establishment (MUSE) since 2008. Among its four muon beam lines, the decay muon line (D-Line) has been extracting and providing surface muons and positive decay muons up to a momentum of 50 MeV/c for various users, utilizing a superconducting solenoid. The D-Line as well as the other J-PARC facility suffered severe damages from the earthquake on March 11, 2011. It necessitated rebuilding of the damaged superconducting solenoid. New design parameter of the solenoid is as follows: length of solenoid: 6 m, diameter of warm bore: 0.2 m, magnetic field of bore center: 3.5 T, rated current: 415 A, superconducting wire: NbTi/Cu, quench protection: quench back heaters. The six-meter-long solenoid consists of twelve pieces of 0.5-meter-long superconducting coils. The entire solenoid is forced-indirectly cooled by supercritical helium flow. This report describes the design and manufacturing process of the newly built superconducting solenoid for D-Line of J-PARC muon facility.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB034  
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TUPMR005 First Results of a Turbo Generator Test for Powering the HV-Solenoids at a Relativistic Electron Cooler electron, high-voltage, experiment, power-supply 1233
 
  • A. Hofmann, K. Aulenbacher, M.W. Bruker, J. Dietrich, T. Weilbach
    HIM, Mainz, Germany
  • W. Klag
    IKP, Mainz, Germany
  • V.V. Parkhomchuk, V.B. Reva
    BINP SB RAS, Novosibirsk, Russia
  
  One of the challenges in a relativistic electron cooler is the generation of high voltage exceeding 2 MV and the powering of HV-solenoids, which need a floating power supply. As replacement of the well established, but limited, methods we propose streaming gas for the power transfer. The conversion of the energy by a turbo generator enables using scalable power supply / HV-generator combinations. BINP SB RAS has proposed two possibilities to build the power supply in a modular way. In the first proposal, two cascade transformers per module should be used; the first one powers 22 small HV-solenoids, the second one generates the voltage. In order to reach the final voltage, the modules are cascaded. The cascade transformers are fed by a turbo generator, which is driven by pressurised gas. The second possibility is to use two big HV-solenoids, which are powered directly by a turbo generator. The voltage could be generated for example with a Cockcroft Walton generator. A potential candidate is the Green Energy Turbine (GET) from the company DEPRAG, Germany. At the Helmholtz-Institut Mainz, two GET were tested. In this report, we present our experience and show first results.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR005  
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TUPMR006 The ELENA Electron Cooler electron, gun, vacuum, antiproton 1236
 
  • G. Tranquille, J. Cenede, A. Frassier, L.V. Jørgensen, A.J. Kolehmainen, B. Moles, M.A. Timmins
    CERN, Geneva, Switzerland
  
  The ELENA (Extra Low ENergy Antiproton) ring will deliver antiprotons at an energy of just 100 keV to experiments aiming to precisely measure the properties of anti-hydrogen atoms. A crucial component of this decelerator ring is the electron cooler which will be used to counter the beam blow-up as the antiproton energy is reduced from 5.3 MeV to 100 keV. The electron cooler will operate at energies below 350 eV in a longitudinal guiding field of 100 G such that the perturbations to the ring can be easily corrected. We will present the design considerations as well as the production status of the cooler.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR006  
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TUPMR020 In-depth Analysis and Optimization of the European Spallation Source Front End Lattice rfq, space-charge, simulation, emittance 1274
 
  • Y.I. Levinsen, M. Eshraqi
    ESS, Lund, Sweden
  • L. Celona, L. Neri
    INFN/LNS, Catania, Italy
  
  The European Spallation Source front end will deliver a 62.5 mA beam current of 2.8 ms duration at 352 MHz to the downstream linac, which in turn will produce a 5 MW proton beam onto the target. Such unprecedented beam power requires a high quality beam with accurate and stable beam parameters in order to assure low beam losses and safe transport through the linac. In this paper we present advanced tuning methods for the low energy beam transport and the radio frequency quadrupole.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR020  
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TUPMR029 Advanced EBIS Charge Breeder for Rare Isotope Science Project electron, ion, gun, vacuum 1304
 
  • S.A. Kondrashev, J.-W. Kim, Y.H. Park
    IBS, Daejeon, Republic of Korea
  • H.J. Son
    Handong Global University, Pohang, Republic of Korea
  
  Rare Isotope Science Project (RISP) is under development in Korea to provide wide variety of intense rare isotope beams for nuclear physics experiments and applied science using both Isotope Separation On-Line (ISOL) and In-Flight Fragmentation (IF) techniques. Electron Beam Ion Source (EBIS) charge breeder is a key element to efficiently accelerate rare isotope ion beams produced by ISOL method. These beams will be charge-bred by an EBIS charge breeder to a charge-to-mass ratio (q/A) ≥ - and accelerated by linac post-accelerator to energies of 18.5 MeV/u. Utilization of 3 A electron beam and 6 T superconducting solenoid with wide (8) warm bore diameter will allow high efficient and fast charge breeding of rare isotope beams with exceptional degree of purity. The main features of RISP EBIS charge breeder design and current status of the project will be presented and discussed.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR029  
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TUPMR033 Low Emittance Growth in a LEBT with Un-neutralized Section ion, ion-source, emittance, vacuum 1317
 
  • L.R. Prost, J.-P. Carneiro, A.V. Shemyakin
    Fermilab, Batavia, Illinois, USA
  
  Funding: Operated by Fermi Research Alliance, LLC, under Contract DE-AC02-07CH11359 with the United States Department of Energy
In a Low Energy Beam Transport line (LEBT), the emittance growth due to the beam's own space charge is typically suppressed by way of neutralization from either electrons or ions, which originate from ionization of the background gas. In cases where the beam is chopped, the neutralization pattern changes throughout the beginning of the pulse, causing the Twiss parameters to differ significantly from their steady state values, which, in turn, may result in beam losses downstream. For a modest beam perveance, there is an alternative solution, in which the beam is kept un-neutralized in the portion of the LEBT that contains the chopper. The emittance can be nearly preserved if the transition to the un-neutralized section occurs where the beam exhibits low transverse tails. This report discusses the experimental realization of such a scheme at Fermilab's PXIE, where low beam emittance dilution was demonstrated 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR033  
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TUPMR041 Design of the Low Energy Beam Transport Line for Xi‘an Proton Application Facility rfq, ion, ion-source, simulation 1343
 
  • R. Ruo, L. Du, T. Du, X. Guan, C.-X. Tang, R. Tang, X.W. Wang, Q.Z. Xing, H.Y. Zhang, Q.Z. Zhang
    TUB, Beijing, People's Republic of China
  • W.Q. Guan, Y. He, J. Li
    NUCTECH, Beijing, People's Republic of China
  
  Xi‘an Proton Application Facility (XiPAF) is a new proton project which is being constructed for single-event-effect experiments. It can provide proton beam with the maximum energy of 200 MeV. The accelerator facility of XiPAF mainly contains a 7 MeV H− linac injector and a proton synchrotron accelerator. The 7 MeV H− linac injector is composed of an ECR ion source, a Low Energy Beam Transport line (LEBT), a Radio Frequency Quadrupole accelerator (RFQ) and a Drift Tube Linac (DTL). The 50 keV 10 mA H− beam (pulse width 1ms) extracted from the ion source is expected to be symmetric with the Twiss parameters alpha=0 and β=0.065 mm/mrad. The RMS normalized emittance is required to be less than 0.2 π mm·mrad. With an adjustable collimator and an electric chopper in the 1.7 m-long LEBT, the beam pulse width of 10~40μs and peak current of 6 mA can be obtained. The H− beam is matched into the downstream RFQ accelerator with alpha=1.051 and β=0.0494 mm/mrad. This paper shows the detailed design process of the LEBT and simulation result with the TRACEWIN code.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR041  
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TUPMY006 MICE Step IV Optics without the M1 Coil in SSD emittance, lattice, simulation, scattering 1553
 
  • A. Liu
    Fermilab, Batavia, Illinois, USA
  
  Funding: Fermi National Accelerator Laboratory
The international Muon Ionization Cooling Experiment (MICE) will demonstrate ionization cooling, the only technique that, given the short muon lifetime, can reduce the phase-space volume occupied by a muon beam quickly enough. MICE will demonstrate cooling in two steps. In the first one, Step IV, MICE will study the multiple Coulomb scattering in liquid hydrogen (LH2) and lithium hydride (LiH). A focus coil module will provide focussing on the absorber. The transverse emittance will be measured upstream and downstream of the absorber in two spectrometer solenoids (SS). Magnetic fields generated by two match coils in the SSs allow the beam to be matched into a flat-field regions in which the tracking detectors are installed. An incident in September 2015 rendered matching coil \#1 (M1D) of the downstream spectrometer inoperable. A new Step IV lattice without M1D and its optimization via a Genetic Algorithm (GA) will be described in this paper. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY006  
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TUPMY008 Phase Rotation of Muon Beams for Producing Intense Low-energy Muon Beams experiment, proton, simulation, target 1556
 
  • Y. Bao, Y. Bao, G. Hansen
    UCR, Riverside, California, USA
  • D.V. Neuffer
    Fermilab, Batavia, Illinois, USA
  
  Low-energy muon beams are useful for rare decay researches, providing access to new physics that cannot be addressed at high-energy colliders. However, the large initial energy spread of the muon beam greatly limits the efficiency of muon applications. In this paper we outline a phase rotation method to significantly increase the intensity of low-energy muons. The muons are first produced by a short pulsed proton driver, and after a drift channel they form a time-momentum correlation. A series of rf cavities is used to bunch the muons and then phase rotate the bunches so that all the bunches reaches a momentum around 100 MeV/c. Then another group of rf cavities is used to decelerate the muon bunches to low-energy. Such a method produces low-energy muons with an efficiency of 0.1 muon per 8 GeV proton, which is significantly higher than the current Mu2e experiment at Fermilab, and it provides the possibility for the next generation rare decay researches.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY008  
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TUPMY011 Simulated Measurements of Cooling in Muon Ionization Cooling Experiment lattice, emittance, detector, electron 1565
 
  • T.A. Mohayai
    IIT, Chicago, Illinois, USA
  • C.T. Rogers
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
  • P. Snopok
    Fermilab, Batavia, Illinois, USA
  • P. Snopok
    Illinois Institute of Technology, Chicago, Illlinois, USA
  
  Cooled muon beams set the basis for the exploration of physics of flavour at a Neutrino Factory and for multi-TeV collisions at a Muon Collider. The international Muon Ionization Cooling Experiment (MICE) measures beam emittance before and after an ionization cooling cell and aims to demonstrate emittance reduction in muon beams. In the current MICE Step IV configuration, the MICE muon beam passes through low-Z absorber material for reducing its transverse emittance through ionization energy loss. Two scintillating fiber tracking detectors, housed in spectrometer solenoid modules upstream and downstream of the absorber are used for reconstructing position and momentum of individual muons for calculating transverse emittance reduction. However, due to existence of non-linear effects in beam optics, transverse emittance growth can be observed. Therefore, it is crucial to develop algorithms that are insensitive to this apparent emittance growth. We describe a different figure of merit for measuring muon cooling which is the direct measurement of the phase space density.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY011  
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TUPMY041 Delivery Status of the ELI-NP Gamma Beam System gun, laser, linac, vacuum 1635
 
  • S. Tomassini, D. Alesini, A. Battisti, R. Boni, F. Cioeta, A. Delle Piane, E. Di Pasquale, G. Di Pirro, A. Falone, A. Gallo, S.I. Incremona, V.L. Lollo, A. Mostacci, S. Pioli, R. Ricci, U. Rotundo, A. Stella, C. Vaccarezza, A. Vannozzi, A. Variola
    INFN/LNF, Frascati (Roma), Italy
  • A. Bacci, D.T. Palmer, L. Serafini
    Istituto Nazionale di Fisica Nucleare, Milano, Italy
  • N. Bliss
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  • F. Cardelli
    INFN-Roma1, Rome, Italy
  • K. Cassou, Z.F. Zomer
    LAL, Orsay, France
  • G. D'Auria
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • A. Giribono, V. Pettinacci
    INFN-Roma, Roma, Italy
  • C. Hill
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • L. Palumbo
    Rome University La Sapienza, Roma, Italy
  • L. Piersanti
    University of Rome La Sapienza, Rome, Italy
  
  The ELI-NP GBS is a high intensity and monochromatic gamma source under construction in Magurele (Romania). The design and construction of the Gamma Beam System complex as well as the integration of the technical plants and the commissioning of the overall facility, was awarded to the Eurogammas Consortium in March 2014. The delivery of the facility has been planned in for 4 stages and the first one was fulfilled in October 31st 2015. The engineering aspects related to the delivery stage 1 are presented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY041  
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TUPOW014 Simulation of High Resolution Field Emission Imaging in an rf Photocathode Gun electron, cathode, gun, simulation 1769
 
  • J.H. Shao, H.B. Chen, J. Shi, X.W. Wu
    TUB, Beijing, People's Republic of China
  • S.P. Antipov, C.-J. Jing
    Euclid TechLabs, LLC, Solon, Ohio, USA
  • W. Gai
    ANL, Argonne, Illinois, USA
  • F.Y. Wang
    SLAC, Menlo Park, California, USA
  
  Precisely locating field emission (FE) emitters on a realistic surface in rf structures is technically chal-lenging in general due to the wide emitting phase and the broad energy spread. A method to achieve in situ high resolution FE imaging has been proposed by using solenoids and a collimator to select electrons emitted at certain phases. The phase selection criterion and imaging properties have been studied by the beam dynamics code ASTRA. Detailed results are presented in this paper.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOW014  
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TUPOW028 Comparison of Model vs. Reality for VELA gun, cathode, simulation, laser 1810
 
  • M.S. Toplis, J.W. McKenzie, B.D. Muratori, D.J. Scott, P.H. Williams
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  
  The Versatile Electron Linear Accelerator (VELA) is a facility designed to provide a high quality electron beam for accelerator systems development, as well as industrial and scientific applications. Currently, the RF gun can deliver short bunches, of the order of 100 fs to a few ps, with a charge of up to 250 pC, at the longer bunch lengths, and up to 4.5 MeV/c beam momentum. A model for the injector has been developed in ASTRA, together with a suite of scripts to create scans of the available parameters around an empirically found arbitrarily optimal working point. The space of parameters consists of everything that can be changed in the control room, and ranges from bunch charge to laser spot size on the cathode, together with all magnet settings where and if necessary. The various scans facilitate the task of identifying where exactly the accelerator is in terms of parameters and trends. Initial comparisons of screen images are made between the model and reality. Ultimately, the goal of the model is to robustly and repeatably establish a desired operating setup on a daily basis from an unknown switch on condition.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOW028  
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WEYA01 Beam Physics and Technical Challenges of the FRIB Driver Linac linac, ion, focusing, cavity 2039
 
  • Y. Yamazaki, H. Ao, N.K. Bultman, F. Casagrande, C. Compton, K.D. Davidson, A. Facco, F. Feyzi, P.E. Gibson, T. Glasmacher, Z.Q. He, L.T. Hoff, K. Holland, M. Ikegami, S.M. Lidia, Z. Liu, G. Machicoane, F. Marti, S.J. Miller, D. Morris, J. Popielarski, L. Popielarski, G. Pozdeyev, T. Russo, K. Saito, S. Shanab, G. Shen, S. Stark, H. Tatsumoto, R.C. Webber, J. Wei, T. Xu, Y. Zhang, Q. Zhao, Z. Zheng
    FRIB, East Lansing, Michigan, USA
  • K. Dixon, V. Ganni
    JLab, Newport News, Virginia, USA
  • A. Facco
    INFN/LNL, Legnaro (PD), Italy
  • K. Hosoyama, M. Masuzawa, K. Tsuchiya
    KEK, Ibaraki, Japan
  • M.P. Kelly, P.N. Ostroumov
    ANL, Argonne, Illinois, USA
  • R.E. Laxdal
    TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
  
  Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661.
The FRIB driver linac accelerates all the stable ion beams including uranium over 200 MeV/u with a CW beam power of 400 kW in order to produce isotopes as rare as possible. Except for 0.5 MeV/u RFQ, the linac is making use of superconducting (SC) RF technology. The beam power, which is an order of 2.5 as high as those of existing SC heavy ion linac, gives rise to many technical challenges as well as beam physics related ones. In particular, the uranium beam loss power density is approximately 30 times as high as the proton one with the same beam energy per nucleon and the same beam power. For this reason, the machine protection system needs a special care. Another example of the technical challenges is to install beam focusing solenoid as close as possible to SC cavities in order to ensure the frequent beam focusing both longitudinally and transversely. The talk reviews all these challenges with development results of their mitigation as well as construction status. 		 
slides icon Slides WEYA01 [16.820 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEYA01  
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WEIB06 Industry Role for Advanced Accelerator R&D emittance, cavity, plasma, linac 2114
 
  • R.P. Johnson
    Muons, Inc, Illinois, USA
  
  Besides large research institutes which typically focus on fundamental research, industrial companies can also contribute to the development of advanced applications of accelerators as well as to fundamental accelerator technology. The funding of advanced or fundamental R&D, which is usually high-risk but potentially high-reward, is difficult to obtain for any organization, especially smaller industrial companies. As an example of one funding approach, I discuss the role of industrial companies in the field of accelerators and present several examples from my own experience of advanced R&D performed by industry under the United States Department of Energy Small Business Innovation and Small Business Technology Transfer Research (SBIR-STTR) Grant programs.  
slides icon Slides WEIB06 [6.226 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEIB06  
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WEPMB021 Construction of Measurement System for Superconducting Characteristics on Thin-film Samples at KEK cavity, operation, experiment, SRF 2167
 
  • T. Saeki, H. Hayano, T. Kubo
    KEK, Ibaraki, Japan
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto, Japan
  • H. Oikawa
    Utsunomiya University, Utsunomiya, Japan
  
  We set up a measurement system for superconducting characteristics on thin-film samples at KEK. The system includes small-sized and middle-sized cryostats, where critical temperature, critical magnetic field, Residual Resistiviy Ratio (RRR), Superconducting RF (SRF) resistivity can be measured on thin-film samples. A small-sized cryostat has a compact refrigerator to cool down samples for the measurements of critical temperature and RRR. On the other had, we can cool down various setups with a middle-sized cryostat by using liquid helium. A thin-film sample is set into a mushroom cavity and the SRF characteristics of the thin-film sample can be measured. In another setup, a sample is set with a small coil and the third harmonic measurement is done on the sample around the critical temperature. Finally, a thin-film sample is set into the bore-center of superconducting magnet and the magnetization of sample is measured with external magnetic field around the critical temperature. This article presents the details of the system and some measurements of samples by the system.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB021  
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WEPMB051 HIE-ISOLDE: First Commissioning Experience cryomodule, operation, controls, cavity 2230
 
  • W. Venturini Delsolaro, E. Bravin, N. Delruelle, M. Elias, J.A. Ferreira Somoza, M.A. Fraser, J. Gayde, Y. Kadi, G. Kautzmann, F. Klumb, Y. Leclercq, M. Martino, V. Parma, J.A. Rodriguez, S. Sadovich, E. Siesling, D. Smekens, L. Valdarno, D. Valuch, P. Zhang
    CERN, Geneva, Switzerland
  
  The HIE ISOLDE project [1] reached a major milestone in October 2015, with the start of the first physics run with radioactive ion beams. This achievement was the culminating point of intense months during which the first cryomodule of the HIE ISOLDE superconducting Linac and its high-energy beam transfer lines were first installed and subsequently brought into operation. Hardware commissioning campaigns were conducted in order to define the envelope of parameters within which the machine could be operated, to test and validate software and controls, and to investigate the limitations preventing the systems to reach their design performance. Methods and main results of the first commissioning of HIE ISOLDE post accelerator, including the performance of the superconducting cavities with beam, will be reviewed in this contribution.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB051  
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WEPMR007 Electron Lens Construction for the Integrable Optics Test Accelerator at Fermilab electron, gun, optics, focusing 2271
 
  • M.W. McGee, K. Carlson, L.E. Nobrega, G. Stancari, A. Valishev
    Fermilab, Batavia, Illinois, USA
  
  Funding: Operated by Fermi Research Alliance, LLC, under Contract No. DE-AC02- 07CH11359 with the U.S. Department of Energy.
The Integrable Optics Test Accelerator (IOTA) is proposed for operation at Fermilab. The goal of IOTA is to create practical nonlinear accelerator focusing systems with a large frequency spread and stable particle motion. The IOTA is a 40 m circumference, 150 MeV (e-), 2.5 MeV (p+) diagnostic test ring. Construction of an electron lens for IOTA is necessary for both electron and proton operation. Components required for the Electron Lens design include; a 0.8 T conventional water-cooled main solenoid, and magnetic bending and focusing elements. The foundation of the design relies on repurposing the Fermilab Tevatron Electron Lens II (TELII) gun and collector under ultra-high vacuum (UHV) conditions. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR007  
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WEPMR045 Engineering Issues of the Medium Energy Beam Transport Line and SRF Linac for the LIPAc linac, SRF, alignment, vacuum 2377
 
  • D. Gex, H. Dzitko, A. Lo Bue, G. Phillips, L. Semeraro, J.M. Zarzalejos
    F4E, Germany
  • N. Bazin, G. Devanz, P. Hardy
    CEA/IRFU, Gif-sur-Yvette, France
  • J. Castellanos, J.M. García, D. Jiménez-Rey, D. López, L.M. Martínez, I. Podadera
    CIEMAT, Madrid, Spain
  • O. Nomen
    IREC, Sant Adria del Besos, Spain
  • F. Scantamburlo
    IFMIF/EVEDA, Rokkasho, Japan
  
  The International Fusion Materials Irradiation Facility (IFMIF) aims to provide an accelerator-based, D-Li neutron source to produce high energy neutrons at sufficient intensity and irradiation volume for DEMO materials qualification. Part of the Broader Approach (BA) agreement between Japan and EURATOM, the goal of the IFMIF/EVEDA project is to work on the engineering design of IFMIF and to validate the main technological challenges which, among a wide diversity of hardware includes the LIPAC (Linear IFMIF Prototype Accelerator), a 125 mA CW deuteron accelerator up to 9 MeV mainly designed and manufactured in Europe. The aim of this paper is to address the engineering issues of the MEBT and SRF linac related to assembly and Integration at LIPAc facility, focusing in the seismic analysis of the beamlines to ensure the robustness of the equipment and the alignment activities with the cutting edge technology performed in Europe before sending the components to Rokkasho. These activities are essential before starting the installation process of the MEBT in the first half of 2016, and to initiate the assembly and integration of the SRF Linac cryomodule in the next phase.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR045  
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WEPMW015 Evaluation and Compensation of Detector Solenoid Effects in the JLEIC detector, ion, coupling, quadrupole 2454
 
  • G.H. Wei, F. Lin, V.S. Morozov, F.C. Pilat, Y. Zhang
    JLab, Newport News, Virginia, USA
  
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contracts No. DE-AC05-06OR23177 and DE-AC02-06CH11357. Work supported also by the U.S. DOE Contract DE-AC02-76SF00515.
The JLEIC detector solenoid has a strong 3 T field in the IR area, and its tails extend over a range of several meters. One of the main effects of the solenoid field is coupling of the horizontal and vertical betatron motions which must be corrected in order to preserve the dynamical stability and beam spot size match at the IP. Additional effects include influence on the orbit and dispersion caused by the angle between the solenoid axis and the beam orbit. Meanwhile it affects ion polarization breaking the figure-8 spin symmetry. Crab dynamics further complicates the picture. All of these effects have to be compensated or accounted for. The proposed correction system is equivalent to the Rotating Frame Method. However, it does not involve physical rotation of elements. It provides local compensation of the solenoid effects independently for each side of the IR. It includes skew quadrupoles, dipole correctors and anti-solenoids to cancel perturbations to the orbit and linear optics. The skew quadrupoles and FFQ together generate an effect equivalent to adjustable rotation angle to do the decoupling task. Details of all of the correction systems are presented. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMW015  
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WEPMY033 Intermediate Commissioning Results of the 70 mA/50 keV H+ and 140 mA/100 keV D+ ECR Injector of IFMIF/LIPAC emittance, rfq, operation, focusing 2625
 
  • B. Bolzon, N. Chauvin, S. Chel, R. Gobin, F. Harrault, F. Senée, M. Valette
    CEA/DSM/IRFU, France
  • J.M. Ayala, J. Knaster, A. Marqueta, K. Nishiyama, Y. Okumura, M. Perez, G. Pruneri, F. Scantamburlo
    IFMIF/EVEDA, Rokkasho, Japan
  • P.-Y. Beauvais, H. Dzitko, D. Gex, G. Phillips
    F4E, Germany
  • L. Bellan
    Univ. degli Studi di Padova, Padova, Italy
  • L. Bellan, M. Comunian, E. Fagotti, F. Grespan, A. Pisent
    INFN/LNL, Legnaro (PD), Italy
  • P. Cara, R. Heidinger
    Fusion for Energy, Garching, Germany
  • R. Ichimiya, A. Ihara, Y. Ikeda, A. Kasugai, T. Kikuchi, T. Kitano, M. Komata, K. Kondo, S. Maebara, S. O'hira, M. Sugimoto, H. Takahashi, H. Usami
    JAEA, Aomori, Japan
  • K. Sakamoto
    QST, Aomori, Japan
  • K. Shinto
    Japan Atomic Energy Agency (JAEA), International Fusion Energy Research Center (IFERC), Rokkasho, Kamikita, Aomori, Japan
  
  The LIPAc accelerator aims to operate 125 mA/CW deuteron beam at 9 MeV to validate IFMIF's accelerators that will operate in CW 125 mA at 40 MeV. The different subsystems of LIPAc have been designed and constructed mainly by European labs and are being installed and commissioned in Rokkasho Fusion Center. The 2.45 GHz ECR injector developed by CEA-Saclay is designed to deliver 140 mA/100 keV CW D+ beam with 99% gas fraction ratio. Its LEBT presents a dual solenoid focusing system to transport and match the beam into the RFQ. Its commissioning continues in 2016 in parallel with the RFQ installation. The normalized RMS emittance at the RFQ injection cone is to be within 0.25π mm·mrad to allow 96% transmission through the 9.81 m long RFQ. In order to avoid activation during commissioning, an equal perveance H+ beam of half current and half energy as nominal with deuterons is used. In this article, the commissioning results with 110 mA/100 keV D+ beam and 55 mA/50 keV H+ beam are first reported.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY033  
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WEPOY024 Beam Dynamics Simulations of the Thomx Linac emittance, gun, laser, electron 3036
 
  • L. Garolfi, C. Bruni, M. El Khaldi, P. Lepercq, C. Vallerand
    LAL, Orsay, France
  • N. Faure
    PMB-ALCEN, PEYNIER, France
  
  ThomX Compton light source is designed to maximise the average X-ray flux providing a compact and tunable machine which can operate in hospitals or in museums. These constraints impose the choice of a high collision rate which is based on S-band Linac whose energy is 50-70 MeV combined to an electron storage ring. As most of the performances of the electron beam at the interaction point depend on the beam quality at the ring entrance, the linear accelerator must be carefully designed and especially the photo-injector. Simulations have been carried out in order to optimise the emittance for the ring entrance. Indeed, for a bunch charge of 1 nC, space charge effects usually dominate the total beam emittance. The latter can be minimized at the end of the Linac by means of emittance compensation. The best configuration across all the parameters will be presented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY024  
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WEPOY033 Space Charge Compensation in Low Energy Beam Lines space-charge, simulation, proton, electron 3055
 
  • F. Gérardin, N. Chauvin, D. Uriot
    CEA/IRFU, Gif-sur-Yvette, France
  • M.A. Baylac, D. Bondoux, F. Bouly
    LPSC, Grenoble Cedex, France
  • A. Chancé, O. Napoly, N. Pichoff
    CEA/DSM/IRFU, France
  
  The dynamics of a high intensity beam with low energy is governed by its space-charge forces which may be responsible of emittance growth and halo formation due to their non-linearity. In a low energy beam transport (LEBT) line of a linear accelerator, the propagation of a charged beam with low energy causes the production of secondary particles created by the interaction between the beam and the background gas present in the accelerator tube. This phenomenon called space-charge compensation is difficult to characterize analitically. In order to obtain some quantitative to characterize the space-charge compensation (or neutralization), numerical simulations using a 3D PIC code have been implemented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY033  
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WEPOY040 Lattice Translation Between Accelerator Simulation Codes for Superkekb lattice, quadrupole, closed-orbit, optics 3077
 
  • D. Zhou, H. Koiso, A. Morita, Y. Ohnishi, K. Oide, H. Sugimoto
    KEK, Ibaraki, Japan
  • M.E. Biagini
    INFN/LNF, Frascati (Roma), Italy
  • N. Carmignani, S.M. Liuzzo
    ESRF, Grenoble, France
  • D. Sagan
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  
  To improve collaborative studies on beam dynamics for SuperKEKB between several labs, efforts have been made to translate the SAD lattices of SuperKEKB rings to the versions for other codes: AT, Bmad, MAD-X, and PTC. It turns out that lattice translations between these codes are not straightforward because of the complexity of the SuperKEKB lattices. In this paper, we describe our experiences of lattice translations, and present some results of benchmarks for the case of SuperKEKB.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY040  
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THPMB011 Beam Based Alignment Methods for Cavities and Solenoids in Photo-Injectors cavity, target, linac, experiment 3247
 
  • M. Rossetti Conti
    Universita' degli Studi di Milano & INFN, Milano, Italy
  • A. Bacci
    Istituto Nazionale di Fisica Nucleare, Milano, Italy
  
  Solenoids are often used as lens-like beam focusing elements in electron linacs, especially in the low energy beam lines aside the Gun solenoid for emittance compensation, a common element of high brightness photo-injectors. There are also many electron linacs worldwide which use the Velocity Bunching beam compression technique, which needs solenoids wrapping the first acceleration cavity. A misalignment between the beam trajectory and the magnetic center of the solenoids produces a decrease in the beam quality and makes it necessary to find a complex steering setting to force the beam on a good orbit. In this proceeding we present a study of two beam based alignment techniques, which are correlated: the first shows a method to find the correct electromagnetic axis of an acceleration cavity, the second shows how to align the solenoids (wrapping the cavity) on this axis. Therefore the study permits to find the best steering setting and the solenoids positions corrections which have to be done. The work is based on real data acquired on the SPARC linac and on a virtual experiment.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB011  
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THPMB015 Muon Charge Separation by Mixed Structure of Dipoles and Solenoids emittance, dipole, target, beam-transport 3257
 
  • Y.P. Song, H.T. Jing, J.Y. Tang
    IHEP, Beijing, People's Republic of China
  
  A charge separation system comprised by dipoles and solenoids is described which aims to separate positive particles and negative particles apart in secondary beam with a large emittance and huge momentum spread, particularly for mixed-charge muon beams. Nonlinear effect and fringe field effect due to large aperture and large moment range are crucial under this circumstance, which make the charge separation extremely complicated. The design schemes by dipoles and bent solenoids and also simulation results are showed in the paper.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB015  
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THPMB047 Beam Dynamics Studies of the ELENA Electrostatic Transfer Lines in the Presence of Magnetic Stray Fields experiment, antiproton, simulation, quadrupole 3351
 
  • J. Jentzsch, W. Bartmann, M.A. Fraser, R. Ostojić, G. Tranquille
    CERN, Geneva, Switzerland
  • D. Barna
    University of Tokyo, Tokyo, Japan
  
  The ELENA (Extra Low ENergy Antiproton) ring at CERN will further decelerate antiprotons produced at the AD (Antiproton Decelerator) facility from a kinetic energy of 5.3 MeV to 100 keV. The antiprotons will be distributed through a network of electrostatic transfer lines to several experiments, which will replace the existing magnetic transfer lines. The existing experiments and limited space in the AD hall forces the new transfer lines into close proximity to the high-field solenoids used by some experiments to trap the antiprotons. The stray fields from the experimental magnets are known to perturb beam delivery and are a concern for operation at the decreased beam rigidity provided by ELENA. A study was carried out to investigate the influence of stray magnetic fields on the beam, including different ramping periods and operational scenarios. The analytical model of the fields used for simulation will be discussed. Furthermore, trajectory correction algorithms using MADX optic model of the lines have been investigated. The results of these studies as well as specifications of acceptable stray field limits and field attenuation requirements will be presented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB047  
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THPMB048 Design and Optimisation of the ELENA Electron Cooler Gun and Collector electron, gun, simulation, cathode 3354
 
  • G. Tranquille, J. Cenede
    CERN, Geneva, Switzerland
  
  Phase space compression of the antiproton beam in ELENA will be performed by a new electron cooler. The performance of the cooler is greatly influenced by the properties of the electron beam. Careful design of the electron gun electrodes, the quality of the guiding magnetic field and the efficient recuperation of the electrons in the collector ensure that the cooler performance is optimal. We have used COMSOL Multiphysics to design and optimise the complete electron cooler with particular attention to the gun and collector. This software suite uses physics interfaces for modelling common applications and then allows the user to combine the different interfaces in one multi-physics simulation.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB048  
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THPMR010 Electron Polarization in the eRHIC Ring-Ring Design electron, polarization, storage-ring, synchrotron 3403
 
  • V. Ptitsyn, C. Montag, S. Tepikian
    BNL, Upton, Long Island, New York, USA
  
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
High electron beam polarization (70-80%) is required in the future electron-ion collider eRHIC over the whole electron beam energy range from 5 GeV to 20 GeV. This paper analyzes important aspects for achieving a high electron polarization level in the ring-ring design option of eRHIC and presents the design of spin rotators required to generate the longitudinal polarization orientation at the interaction point. Experiment considerations require bunch spin patterns with both spins up and down. A highly polarized beam will be produced by a photo-injector, accelerated to full collision energy by an injector accelerator and injected into the storage ring. Beam depolarization time in the storage ring has to be minimized in the presence of spin rotators, detector solenoid and damping wiggler, which establishes specific requirements for the ring lattice. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR010  
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THPMY010 LHC Beam Vacuum Evolution During 2015 Machine Operation electron, operation, proton, luminosity 3673
 
  • C. Yin Vallgren, G. Bregliozzi, P. Chiggiato
    CERN, Geneva, Switzerland
  
  The LHC successfully returned to operation in April, 2015 after almost 2 years of Long Shutdown 1 (LS1) for various upgrade and consolidation programs. During 2015 operation, the LHC operated for more than 1000 fills. The 2015 LHC proton physics ended with 2244 bunches per beam circulating with 25 ns bunch spacing at top energy of 6.5 TeV. This paper summarizes the dynamic vacuum observations in different locations along the LHC during dedicated fills as well as during physics runs with both 50 ns and 25 ns bunch spacing. The causes for the dynamic pressure rises are investigated and are presented. A clear beam conditioning effect is observed, as well as a so-called de-conditioning effect. Furthermore, for the experimental areas, the dynamic pressure evolution is also presented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMY010  
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THPOR014 MDI Design in CEPC Partial Double Ring detector, scattering, radiation, synchrotron 3802
 
  • S. Bai, J. Gao, Y. Wang, Q.L. Xiu, W.C. Yao, Y. Yue
    IHEP, Beijing, People's Republic of China
  
  With the discovery of the higgs boson at around 125GeV, a circular higgs factory design with high luminosity (L ~ 1034 cm-2 s-1) is becoming more popular in the accelerator world. The CEPC project in China is one of them. Machine Detector Interface (MDI) is the key research area in electron-positron colliders, especially in CEPC, it is one of the criteria to measure the accelerator and detector design performance. Detector background, collimator and solenoid compensation are the most critical physics problem. Beamstrahlung is the problem which is never gotten into before in the existed electron positron collider of world history. Every kinds of background are bad for detector, and solenoid can make damage to accelerator beam. We will use a Monte Carlo simulation method to calculate and analysis the CEPC detector background and the harm it makes to detector. Anti-solenoid are designed to compensate the strong detector solenoid field of several tesla.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR014  
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THPOR023 The FCC-ee Interaction Region Magnet Design quadrupole, detector, emittance, interaction-region 3824
 
  • M. Koratzinos, A.P. Blondel
    DPNC, Genève, Switzerland
  • M. Benedikt, B.J. Holzer, F. Zimmermann, J. van Nugteren
    CERN, Geneva, Switzerland
  • A.V. Bogomyagkov, S.V. Sinyatkin
    BINP SB RAS, Novosibirsk, Russia
  • K. Oide
    KEK, Ibaraki, Japan
  
  The design of the region close to the interaction point of the FCC-ee experiments is especially challenging. The beams collide at an angle (±15 mrad) in the high-field region of the detector solenoid. Moreover, the very low vertical β* of the machine necessitates that the final focusing quadrupoles have a distance from the IP (L*) of around 2 m and therefore are inside the main detector solenoid. The beams should be screened from the effect of the detector magnetic field, and the emittance blow-up due to vertical dispersion in the interaction region should be minimized, while leaving enough space for detector components. Crosstalk between the two final focus quadrupoles, only about 6 cm apart at the tip, should also be minimized.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR023  
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THPOW013 ARM-Based Controller of Power Supply for Focus Solenoid of Klystron power-supply, klystron, controls, linac 3957
 
  • Z.R. Zhou, F.L. Shang, L. Shang
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  Funding: Supported by the National Science Foundation of China 11175181 By the Fundamental Research Funds for the Central Universities WK2310000056
Klystrons are widely used in accelerators to provide powerful microwave power to the accelerating structure of linac to accelerate particles. The stability of a klystron is affected by the beam quality of high voltage gun of the klystron. The focus solenoid is needed to provide focus magnetic field around the klystron. ARM-based high performance of current stability power supply is designed to improve the quality of focus magnetic field of klystron, with a two-loop-hybrid design, which could achieve fast dynamic response and high static stability performance, instead of analogue power supply design. The bench test of the ARM-based controlled is done and the commissioning of the controller needs be done in future study. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW013  
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THPOW021 Generation of Homogeneous and Patterned Electron Beams using a Microlens Array Laser-Shaping Technique laser, electron, emittance, experiment 3983
 
  • A. Halavanau, P. Piot
    Northern Illinois University, DeKalb, Illinois, USA
  • D.R. Edstrom, P. Piot, J. Ruan, J.K. Santucci
    Fermilab, Batavia, Illinois, USA
  • W. Gai, G. Ha, J.G. Power, E.E. Wisniewski
    ANL, Argonne, Illinois, USA
  • G. Ha
    POSTECH, Pohang, Kyungbuk, Republic of Korea
  • G. Qiang
    TUB, Beijing, People's Republic of China
  
  Funding: Northern Illinois University - US DOE contract No. DE-SC0011831. Fermilab - US DOE contract No. DE-AC02-07CH11359. The Argonne wakefield facility - US DOE contract No. DE-AC02-06CH11357.
In photocathodes the achievable electron-beam parameters are controlled by the laser used to trigger the photoemission process. Non-ideal laser distribution hampers the final beam quality. Laser inhomogeneities, for instance, can be "amplified" by space-charge force and result in fragmented electron beams. To overcome this limitation laser shaping methods are routinely employed. In the present paper we demonstrate the use of simple microlens arrays to dramatically improve the transverse uniformity. We also show that this arrangement can be used to produce transversely-patterned electron beams. Our experiments are carried out at the Argonne Wakefield Accelerator facility. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW021  
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THPOW057 Direct High Power Laser Diagnostic Technique on Focused Electron Bunch laser, electron, scattering, experiment 4073
 
  • D. Igarashi, A. Endo, K. Sakaue, T. Takahashi, M. Washio
    RISE, Tokyo, Japan
  
  In laser produced plasma EUV source, high intensity pulse CO2 laser is essential for plasma generation. To achieve high conversion efficiency and stable EUV power, we would like to measure a laser profile in the interaction point. However, there is no way to measure directly the laser profile of such a high intensity laser at the focus point. Therefore, we have been developing laser profiler based on laser Compton scattering(LCS). LCS signal by using focused electron beam shows 1D laser profile. 2D laser profile can be reconstructed by one-dimensional laser profiles from various angles using computer tomography. This method is suitable for high intensity laser, but very small spot size of electron beam is required. To obtain small spot size, we used S-band Cs-Te photocathode RF-Gun and specially designed solenoid lens at Waseda university. We already succeeded in observing minimum beam size of about 20 μm rms and this is adequate to scan the CO2 laser. In this conference, we will report the result of the laser Compton scattering with pulse CO2 laser, the preparatory experiment in measuring a metal wire cross section and the present progresses.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW057  
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