WE1AA —  Plenary Session 7   (31-Aug-22   08:30—10:30)
Chair: L. Groening, GSI, Darmstadt, Germany
Paper Title Page
WE1AA01
 ECR Ion Sources for High-Intensity Heavy Ion Beams  
 
  • H.W. Zhao
    IMP/CAS, Lanzhou, People’s Republic of China
  • D. Leitner
    LBNL, Berkeley, California, USA
  • T. Nakagawa
    RIKEN Nishina Center, Wako, Japan
  
  Heavy ion linac requires ion source to deliver high-intensity and highly-charged heavy ion beams in order to achieve higher beam intensity and better cost-effective performance. The 3rd generation highly-charged ECR ion sources with microwave frequency 24-28 GHz and NbTi superconducting magnet have been operating in a few laboratories worldwide, which are able to provide heavy ion beams such as 129Xe30+ of 300 euA, 238U33+ of 400 euA. To further improve beam intensity for higher charge state heavy ion beams, a 4th generation ECR ion source named as FECR (the First fourth generation ECR ion source) with frequency 45 GHz and Nb3Sn superconducting magnet is being developed at IMP. The FECR Nb3Sn magnet is being assembled and it is expected the first beam commissioning results could be presented. Recent research and development on the 3rd and 4th generation ECR ion sources for heavy ions will be reviewed, and future directions will be discussed in this talk.  
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slides icon Slides WE1AA01 [5.587 MB]  
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WE1AA02 Run 2 of the Advanced Plasma Wakefield Experiment (AWAKE) at CERN 625
 
  • G. Zevi Della Porta
    CERN, Meyrin, Switzerland
  
  After successful completion of Run 1 of the Advanced Plasma Wakefield Experiment (AWAKE) at CERN, the experiment started Run 2 in 2021. The goals of AWAKE Run 2 are to accelerate electrons in proton-beam-driven plasma wakefields to high energies with gradients of up to 1 GV/m while preserving the electron beam normalized emittance at the 10 um level, and to demonstrate the acceleration of electrons in scalable plasma sources to 50-100 GeV. The first milestone towards these final goals is to demonstrate electron seeding of the self-modulation of the entire proton bunch. This was achieved in the 2021 run and some highlight results are shown. In the next phases of AWAKE Run 2, a new X-band electron source will provide a 150 MeV, 200 fs, 100 pC electron beam, to be accelerated in the plasma wakefields.  
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slides icon Slides WE1AA02 [23.386 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-WE1AA02  
About • Received ※ 22 August 2022 — Revised ※ 30 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 16 September 2022
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WE1AA03 FACET-II 631
 
  • C.I. Clarke, J.M. Allen, L.E. Alsberg, A.L. Edelen, H.E. Ekerfelt, C. Emma, E. Gerstmayr, S.J. Gessner, C. Hast, M.J. Hogan, M.D. Litos, R. Loney, S. Meuren, S.A. Miskovich, B.D. O’Shea, M. Parker, D.A. Reis, D.W. Storey, R. Watt, G. Yocky
    SLAC, Menlo Park, California, USA
  • R. Ariniello, C.E. Doss, V. Lee
    CIPS, Boulder, Colorado, USA
  • G.J. Cao
    University of Oslo, Oslo, Norway
  • S. Corde, A. Knetsch, P. San Miguel Claveria
    LOA, Palaiseau, France
  • C.E. Hansel
    Colorado University at Boulder, Boulder, Colorado, USA
  • C. Joshi, K.A. Marsh, Z. Nie, C. Zhang
    UCLA, Los Angeles, California, USA
  • J. Wang
    UNL, Lincoln, Nebraska, USA
  
  Funding: This work performed under DOE Contract DE-AC02-76SF00515 and also supported under FES Award DE-SC0020076.
FACET-II is a National User Facility at SLAC National Accelerator Laboratory providing 10 GeV electron beams with um-rad normalised emittance and peak currents exceeding 100 kA . FACET-II operates as a National User Facility while engaging a broad User community to develop and execute experimental proposals that advance the development of plasma wakefield accelerators. FACET-II is currently commissioned and has started with first experiments. The special features of FACET-II will be shown and first results from the experiments. 		 
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slides icon Slides WE1AA03 [6.471 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-WE1AA03  
About • Received ※ 20 August 2022 — Revised ※ 23 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 04 September 2022
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WE1AA04
 Nanoparticle Assisted Laser-Wakefield Acceleration of Electron Beams to 10 Gev at the Texas Petawatt Laser  
 
  • B.M. Hegelich
    The University of Texas at Austin, Austin, Texas, USA
  
  We report peak electron energies beyond 10 GeV from a proof-of-principle experiment of laser wakefield electron acceleration with a Petawatt-class laser in a 10 cm long gas cell filled with helium mixed with aluminum nanoparticles. Compared with other wakefield acceleration schemes, our scheme is straightforward since it requires only a gas cell and a source of nanoparticles for electron injection. No external guiding or heating mechanisms are employed. The nanoparticle-assisted laser wakefield acceleration can control all the electron beam parameters: charge, energy spread, energy, emittance, and the number of bunches in the beam. Bunch charges are on the order of a few nanocoulomb for the whole beam and in the 100pC range in the high energy part, an order of magnitude increase over previous results at >5 GeV. We demonstrate shots with percent-level narrow energy spread at multi-GeV energies as well as varying numbers of electron bunches. This new method therefore shows great potential to support the further development of laser-plasma-based electron acceleration.  
slides icon Slides WE1AA04 [8.972 MB]  
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WE1AA05 The Muon Linac Project at J-PARC 636
 
  • Y. Kondo, Y. Fuwa, R. Kitamura, K. Moriya, T. Takayanagi
    JAEA/J-PARC, Tokai-mura, Japan
  • S. Bae, H. Choi, S. Choi, B. Kim, H.S. Ko
    SNU, Seoul, Republic of Korea
  • E. Cicek, H. Ego, Y. Fukao, K. Futatsukawa, N. Kawamura, T. Mibe, Y. Miyake, S. Mizobata, M. Otani, N. Saito, K. Shimomura, T. Yamazaki, M. Yoshida
    KEK, Ibaraki, Japan
  • K. Hasegawa
    QST Rokkasho, Aomori, Japan
  • N. Hayashizaki
    Research Laboratory for Nuclear Research, Tokyo Institute of Technology, Tokyo, Japan
  • T. Iijima, Y. Sue, K. Sumi
    Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan
  • H. Iinuma, Y. Nakazawa
    Ibaraki University, Ibaraki, Japan
  • K. Inami, K. Suzuki, M. Yotsuzuka
    Nagoya University, Nagoya, Japan
  • K. Ishida
    RIKEN Nishina Center, Wako, Japan
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto, Japan
  • T. Morishita
    JAEA/LINAC, Ibaraki-ken, Japan
  • G.P. Razuvaev
    Budker INP & NSU, Novosibirsk, Russia
  • Y. Takeuchi, J. Tojo
    Kyushu University, Fukuoka, Japan
  • E. Won
    Korea University, Seoul, Republic of Korea
  • H.Y. Yasuda
    University of Tokyo, Tokyo, Japan
  
  The muon linac project for the precise measurement of the muon anomalous magnetic and electric dipole moments, which is currently one of the hottest issues of the elementary particle physics, is in progress at J-PARC. The muons from the J-PARC muon facility are once cooled to room temperature, then accelerated up to 212 MeV with a normalized emittance of 1.5 pi mm mrad and a momentum spread of 0.1%. Four types of accelerating structures are adopted to obtain the efficient acceleration with a wide beta range from 0.01 to 0.94. The project is moving into the construction phase. They already demonstrated the re-acceleration scheme of the decelerated muons using a 324-MHz RFQ in 2017. The high-power test of the 324-MHz Interdigital H-mode (IH) DTL using a prototype cavity will be performed in 2021. The fabrication of the first module of 14 modules of the 1296-MHz Disk and Washer (DAW) CCL will be done to confirm the production process. Moreover, the final design of the travelling wave accelerating structure for the high beta region is also proceeding. In this presentation, the recent progress toward the realization of the world first muon linac will be presented.  
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slides icon Slides WE1AA05 [3.764 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-WE1AA05  
About • Received ※ 14 August 2022 — Revised ※ 21 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 16 September 2022
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WE1AA06
 A New Paradigm for Ultra-Low Emittance Muon Beam Generation Based on E.R.L.  
 
  • C. Curatolo, L. Serafini
    INFN-Milano, Milano, Italy
  
  One of the challenges of future muon colliders is the production of muon beams carrying high phase-space densities. In particular, the muon beam normalized transverse emittance is a relevant figure of merit to meet luminosity requests. A typical issue impacting the achieved transverse emittance in muon collider schemes so far considered is the phase space dilution caused by Coulomb interaction of primary particles propagating into the target where muons are generated. In this study we present a new scheme for muon beam generation occurring in vacuum by interactions of electron and photon beams.  
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slides icon Slides WE1AA06 [3.975 MB]  
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