Author: Luo, T.H.
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MOPMW028 Progress on the MICE RF Module at LBNL 454
  • T.H. Luo, A.J. DeMello, A.R. Lambert, D. Li, T.J. Loew, S. Prestemon, S.P. Virostek, J.G. Wallig
    LBNL, Berkeley, California, USA
  • T.G. Anderson, A.D. Bross, M.A. Palmer
    Fermilab, Batavia, Illinois, USA
  • Y. Torun
    IIT, Chicago, Illinois, USA
  The international Muon Ionization Cooling Experiment aims to demonstrate the transverse cooling of a muon beam by ionization in energy absorbers. The final MICE cooling channel configuration has two RF modules, each housing a 201 MHz RF cavity used to compensate the longitudinal energy loss in the absorbers. The assembly of MICE RF Module is being carried out at LBL. In this paper we will report the recent progress on the assembly work.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMW028  
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MOPMW029 Analysis of Transverse Field Induced by Curved Beryllium Window in Muon Ionization Cooling Cavity 457
  • T.H. Luo, D. Li
    LBNL, Berkeley, California, USA
  The beryllium windows are used in muon ionization cooling cavity to increase the cavity shunt impedance. The windows are curved for predictable thermal deformation. This curvature also introduces transverse field, which will affect the transverse beam emittance. In this paper, we will analyze this transverse field and evaluate its effect on the emittance cooling.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMW029  
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MOPMW034 Final Commissioning of the MICE RF Module Prototype with Production Couplers 474
  • Y. Torun, P.G. Lane
    Illinois Institute of Technology, Chicago, Illinois, USA
  • T.G. Anderson, M. Backfish, D.L. Bowring, A. Moretti, D.V. Neuffer, D.W. Peterson, M. Popovic, K. Yonehara
    Fermilab, Batavia, Illinois, USA
  • B.T. Freemire
    IIT, Chicago, Illinois, USA
  • T.L. Hart
    UMiss, University, Mississippi, USA
  • A.V. Kochemirovskiy
    University of Chicago, Chicago, Illinois, USA
  • T.H. Luo
    LBNL, Berkeley, California, USA
  Funding: Supported by the US Department of Energy Office of Science through the Muon Accelerator Program.
We report operational experience from the prototype RF module for the Muon Ionization Cooling Experiment (MICE) with final production couplers at Fermilab's MuCool Test Area. This is the last step in fully qualifying the RF modules for operation in the experiment at RAL.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMW034  
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WEPOW051 R+D Progress Towards a Diffraction Limited Upgrade of the ALS 2962
  • C. Steier, A. Anders, J.M. Byrd, K. Chow, S. De Santis, R.M. Duarte, J.-Y. Jung, T.H. Luo, H. Nishimura, T. Oliver, J.R. Osborn, H.A. Padmore, G.C. Pappas, D. Robin, F. Sannibale, D. Schlueter, C. Sun, C.A. Swenson, M. Venturini, W.L. Waldron, E.J. Wallén, W. Wan, Y. Yang
    LBNL, Berkeley, California, USA
  Funding: This work was supported by the Laboratory Directed Research and Development Program of Lawrence Berkeley National Laboratory under U.S. Department of Energy Contract No. DE-AC02-05CH11231.
Improvements in brightness and coherent flux of about two orders of magnitude over operational storage ring based light sources are possible using multi bend achromat lattice designs. These improvements can be implemented as upgrades of existing facilities, like the proposed upgrade of the Advanced Light Source, making use of the existing infrastructure, thereby reducing cost and time needed to reach full scientific productivity on a large number of beamlines. An R&D program was started at LBNL to further develop the technologies necessary for diffraction-limited storage rings. It involves many areas, and focuses on the specific needs of soft x-ray facilities: NEG coating of small chambers, swap-out injection, bunch lengthening, magnets/radiation production, x-ray optics, and beam physics design optimization. Hardware prototypes have been built and concepts and equipment was tested in beam tests on the existing ALS.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW051  
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WEPOW052 Multimodal Interaction in the ALS Longitudinal Feedback Kicker RF Cavity 2965
  • S. De Santis, K.M. Baptiste, J.M. Byrd, S. Kwiatkowski, T.H. Luo, E.R. Sanmateo, C. Steier, C.A. Swenson
    LBNL, Berkeley, California, USA
  • F. Marcellini
    PSI, Villigen PSI, Switzerland
  Funding: The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
RF cavities are essential components in particle accelerators not only for beam acceleration, but also for control purposes (bunch lengthening/shortening, deflecting and crabbing, transverse and longitudinal kickers) and for beam diagnostics (BPM). Normally, only a single resonating mode is actively used, although other modes can be excited by the circulating beam. Cavities used as feedback longitudinal kickers are designed with an axial mode which, appropriately excited, provides a kick to the circulating bunches for maintaining beam stability. To provide the necessary bandwidth this mode has to be strongly damped resulting in quality factors of just a few units. In the longitudinal feedback kicker cavity just installed on the ALS we have detected a second axial mode which, although a few hundreds of MHz below the 1.4 GHz design mode, is also strongly damped and has a shunt impedance high enough to be appreciably excited by the feedback amplifier coupling to the first mode. In this paper we show bench measurements on the cavity and with beam during its commissioning and discuss the interaction of the two modes resulting in a modulation of shunt impedance and phase response.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW052  
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THPMW038 Prototyping of the ALS-U Fast Kickers 3637
  • G.C. Pappas, S. De Santis, J.-Y. Jung, T.H. Luo, C. Steier, C.A. Swenson, W.L. Waldron
    LBNL, Berkeley, California, USA
  Prototyping of major components for the ALS-U kickers is in progress. A tapered stripline kicker has been built for installation and testing in the ALS, and multiple modulator options to meet the fast rise time required for swap out injection have been considered. High voltage feedthroughs that are matched into the multi GHz range are also being studied.
* Pappas et al., "Fast Kicker Systems for ALS-U", Proc. of IPAC'14, Dresden, Germany, MOPME083.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW038  
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