Author: Luo, T.H.
Paper Title Page
THPPC036 The Alpha Ferrite-loaded Coaxial Resonator Cavity 3365
 
  • A.N. Pham, S.-Y. Lee, T.H. Luo
    IUCEEM, Bloomington, Indiana, USA
 
  Funding: Grant N00164-08-GM03 P00004 from the NSWC Crane Division, DOE Grant DE-FG02-92ER40747, and NSF Grant PHY-0852368 (IU: 48-432-31).
The Advanced Electron Photon Facility (ALPHA)*,** is a joint collaboration between the Indiana University Center for Exploration of Energy and Matter and the Crane Naval Surface Warfare Center. The ALPHA storage ring will serve as a debuncher in single pass mode of operation. With a set of two gradient damping wigglers, the storage ring can also accumulate to achieve high charge density beams. In this report, we present the design, fabrication, and testing of the 15 MHz ferrite-loaded quarter-wave rf coaxial resonator cavity that will be utilized in the ALPHA storage ring. Topics pertaining to beam lifetime, radiation damping, ferrite-loaded transmission lines, and key cavity parameters will be discussed.
* S.Y. Lee, P.E. Sokol, et al, "The ALPHA Project at IU CEEM," Proceedings of the IPAC2010.
** S.Y. Lee, et al, "A low energy electron storage ring with tunable compaction factor," RSI 78, 2007.
 
 
MOPPC046 End-to-End G4Beamline Simulation of an Inverse Cyclotron for Muon Cooling 238
 
  • T.L. Hart, T.H. Luo, D.J. Summers
    UMiss, University, Mississippi, USA
  • K. Paul
    Tech-X, Boulder, Colorado, USA
 
  An inverse cyclotron is a novel, intriguing idea for muon cooling necessary for proposed neutrino factories and muon colliders. We present the latest results of an end-to-end inverse cyclotron simulation that cools muons in the following sequence: single turn injection and initial cooling of 100 MeV kinetic energies to about 5 MeV with lithium hydrogen wedges; further substantial cooling to keV range kinetic energies and trapping with carbon foils and a rising electric field; and re-acceleration of the cooled, trapped muons back to 100 MeV. For neutrino factory and muon collider applications, the time of the entire cooling/trapping/re-acceleration process needs to be comparable to the muon lifetime so that decay losses are tolerable and the acceptance of the inverse cyclotron needs to be sufficiently large (on order 10 mm-rad normalized emittance). The latest progress toward these ends is presented.  
 
TUPPR008 One 233 km Tunnel for Three Rings: e+e-, p-pbar, and μ+ 1828
 
  • G.T. Lyons, L.M. Cremaldi, A. Datta, M. Duraisamy, T.H. Luo, D.J. Summers
    UMiss, University, Mississippi, USA
 
  Funding: Supported by DE-FG05-91ER40622
In 2001, a cost analysis was conducted to build a 233 km circumference tunnel in northern Illinois for a Very Large Hadron Collider (VLHC). Here we outline the implementations of e+e, proton anti-proton, and μ++ μ collider rings in such a tunnel using recent technological innovations. The 500 GeV e+e collider employs a Crab Waist Crossing, ultra low emittance damped bunches, a vertical IP focal length of 0.06 cm, 12 GV of superconducting RF, and 0.026 Tesla low coercivity, grain oriented silicon steel/concrete dipoles. The 40 TeV proton anti-proton collider uses the high intensity Fermilab anti-proton source, exploits high cross sections for proton anti-proton production of high mass states, and uses 2 Tesla 0.005% ultra low carbon steel/YBCO superconductor magnets run with liquid neon. The 40 TeV muon ring ramps the 2 Tesla superconducting magnets at 8 Hz every 0.4 seconds, uses 250 GV of superconducting RF to accelerate muons from 2 to 20 TeV in 72 orbits with 72% survival, and mitigates neutrino radiation with a phase shifting, roller coaster FODO lattice.*
* G. T. Lyons, http://arxiv.org/pdf/1112.1105
 
 
THPPC049 Progress on the MICE 201 MHz RF Cavity at LBNL 3398
 
  • T.H. Luo, D.J. Summers
    UMiss, University, Mississippi, USA
  • A.J. DeMello, D. Li, S.P. Virostek, M.S. Zisman
    LBNL, Berkeley, California, USA
 
  The international Muon Ionization Cooling Experiment (MICE) aims at demonstrating transverse cooling of muon beams by ionization. The ionization cooling channel of MICE requires eight 201-MHz normal conducting RF cavities to compensate for the longitudinal beam energy loss in the cooling channel. In this paper, we present recent progresses on MICE RF cavity at LBNL, which includes electro-polishing, intended to improve the cavity performance in the presence of strong external magnetic field; low power RF measurements on resonant frequency and Q value of each cavity with a pair of curved- beryllium windows to terminate the cavity irises. Multipacting simulations are conducted using SLAC’s ACE-3P code to study the effects in the cavity and coupler regions with the influence by external magnetic field.  
 
THPPP093 Progress on MICE RFCC Module 3954
 
  • D. Li, D.L. Bowring, A.J. DeMello, S.A. Gourlay, M.A. Green, N. Li, T.O. Niinikoski, H. Pan, S. Prestemon, S.P. Virostek, M.S. Zisman
    LBNL, Berkeley, California, USA
  • A.D. Bross, R.H. Carcagno, V. Kashikhin, C. Sylvester
    Fermilab, Batavia, USA
  • Y. Cao, S. Sun, L. Wang, L. Yin
    SINAP, Shanghai, People's Republic of China
  • A.B. Chen, B. Guo, L. Li, F.Y. Xu
    ICST, Harbin, People's Republic of China
  • D.M. Kaplan
    Illinois Institute of Technology, Chicago, Illinois, USA
  • T.H. Luo, D.J. Summers
    UMiss, University, Mississippi, USA
 
  Funding: This work was supported by the Office of Science, U.S. Department of Energy under DOE contract number DE-AC02-05CH11231, US Muon Accelerator Program and NSF MRI award: 0959000.
Recent progress on the design and fabrication of the RFCC (RF and Coupling Coil) module for the international MICE (Muon Ionization Cooling Experiment) will be reported. The MICE ionization cooling channel has two RFCC modules; each having four 201-MHz normal conducting RF cavities surrounded by one superconducting coupling coil (solenoid) magnet. The magnet is designed to be cooled by 3 cryocoolers. Fabrication of the RF cavities is complete; preparation for the cavity electro-polishing, low power RF measurements and tuning are in progress at LBNL. Fabrication of the cold mass of the first coupling coil magnet has been completed in China and the cold mass arrived at LBNL in late 2011. Preparations for testing the cold mass are currently under way at Fermilab. Plans for the RFCC module assembly and integration are being developed and will be described.