Keyword: beam-losses
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MOP2WB03 Emittance Growth and Beam Losses in LANSCE Linear Accelerator emittance, proton, DTL, linac 70
 
  • Y.K. Batygin, R.W. Garnett, L. Rybarcyk
    LANL, Los Alamos, New Mexico, USA
 
  Funding: Work supported by the United States Department of Energy, National Nuclear Security Agency, under contract DE-AC52-06NA25396.
The LANSCE Accelerator facility currently utilizes four 800 MeV H beams and one 100 MeV proton beam. Multi-beam operation requires careful control of accelerator tune to minimize beam losses. The most powerful 80 kW H beam is accumulated in the Proton Storage Ring and is extracted to the Lujan Neutron Scattering Center facility for production of moderated neutrons with meV-keV energy. Another H beam is delivered to the Weapon Neutron Research facility to create un-moderated neutrons in the keV - MeV energy range. The third H beam is shared between the Proton Radiography Facility and the Ultra-Cold Neutron facility. The 23 kW proton beam is used for isotope production in the fields of medicine, nuclear physics, national security, environmental science and industry. Minimization of beam losses in the linac is achieved due to careful tuning of the beam in each section of the accelerator facility, imposing restrictions on amplitudes and phases of RF sections, control of H beam stripping, and optimization of ion sources operation. This paper summarizes experimental results in accelerator operations and categorizes various sources of emittance growth and beam losses.
 
slides icon Slides MOP2WB03 [4.570 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-MOP2WB03  
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WEP2PO033 A Test of Stripper Foil Lifetime in PSI's 72 MeV Proton Beam radiation, detector, cyclotron, TRIUMF 338
 
  • R. Dölling, R. Dressler
    PSI, Villigen PSI, Switzerland
  • L. Calabretta
    INFN/LNS, Catania, Italy
 
  A test of the lifetime of an amorphous carbon foil of ~79 ug/cm2 was performed at PSI in the transfer line between Injector 2 and Ring cyclotron during the regularly beam production. The 72 MeV ~1.7 mA proton beam had a central current density of ~2.8 mA/cm2. Two spots on the foil were irradiated alternatively with in total three fractions of 17, 52 and 119 mAh. Foil thickness was measured before and after irradiation at several positions via the energy loss of alpha-particles from a 241Am source in the foil. We discuss the observed foil damage as well as the experimental setup, the estimation of the beam parameters and practical boundary conditions.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEP2PO033  
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