Experimental study of proton beam halo in mismatched beams

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We report measurements of transverse beam-halo formation in mismatched proton beams in a 52-quadrupole FODO-transport channel following the 6.7 MeV RFQ at the Low-Energy Demonstration Accelerator (LEDA) at Los Alamos. Beam profiles in both transverse planes were measured using a new diagnostic device that consists of a movable carbon filament for measurement of the beam core, and scraper plates for measurement of the outer part of the distributions. The initial results indicate a surprisingly strong growth rate of the rms emittance even for the modest space-charge tune depressions of the experiment. Our results are consistent with the complete transfer of ... continued below

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3 p.

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Allen, C. K. (Christopher K.); Chan, K. D. (Kwok-Chi D.); Colestock, P. L. (Patrick L.),; Garnett, R. W. (Robert W.); Gilpatrick, J. D. (John Douglas); Qiang, J. (Ji) et al. January 1, 2002.

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We report measurements of transverse beam-halo formation in mismatched proton beams in a 52-quadrupole FODO-transport channel following the 6.7 MeV RFQ at the Low-Energy Demonstration Accelerator (LEDA) at Los Alamos. Beam profiles in both transverse planes were measured using a new diagnostic device that consists of a movable carbon filament for measurement of the beam core, and scraper plates for measurement of the outer part of the distributions. The initial results indicate a surprisingly strong growth rate of the rms emittance even for the modest space-charge tune depressions of the experiment. Our results are consistent with the complete transfer of free energy of the mismatched beams into emittance growth within 10 envelope oscillations for both the breathing and the quadrupole modes.

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3 p.

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  • Submitted to: LINAC 2002 Conference, Korea, August 19-23, 2002

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  • Report No.: LA-UR-02-4780
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 976238
  • Archival Resource Key: ark:/67531/metadc929216

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  • January 1, 2002

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 9, 2016, 11:30 p.m.

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Allen, C. K. (Christopher K.); Chan, K. D. (Kwok-Chi D.); Colestock, P. L. (Patrick L.),; Garnett, R. W. (Robert W.); Gilpatrick, J. D. (John Douglas); Qiang, J. (Ji) et al. Experimental study of proton beam halo in mismatched beams, article, January 1, 2002; United States. (digital.library.unt.edu/ark:/67531/metadc929216/: accessed June 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.