Errors in radio-frequency quadrupole structures

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Performance degradation caused by certain radio-frequency quadrupole (RFQ) machine errors was studied using an efficient 3-D particle-tracing simulation code for a high-brightness example. Matched beams, for which no emittance growth occurs, exist for periodic structures and were used as input beams for particle tracing in the presence of errors. We considered both slowly varying and fast (random) errors that destroy periodicity. Random dipole errors cause emittance growth because of the mismatches they introduce and also result in a motion of the beam centroid that causes a reduction in acceptance. Because of the way RFQs are manufactured, the random error amplitudes ... continued below

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Pages: 4

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Lysenko, W.P. January 1, 1983.

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Performance degradation caused by certain radio-frequency quadrupole (RFQ) machine errors was studied using an efficient 3-D particle-tracing simulation code for a high-brightness example. Matched beams, for which no emittance growth occurs, exist for periodic structures and were used as input beams for particle tracing in the presence of errors. We considered both slowly varying and fast (random) errors that destroy periodicity. Random dipole errors cause emittance growth because of the mismatches they introduce and also result in a motion of the beam centroid that causes a reduction in acceptance. Because of the way RFQs are manufactured, the random error amplitudes can be kept below harmful levels. More important are the slow errors, which are harmful because they reduce acceptance even though they maintain a match (up to the point of particle loss). Slow dipole errors steer the beam toward the wall, and voltage deficiencies cause instabilities in the longitudinal direction resulting in particles not being accelerated to full energy.

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Pages: 4

Notes

NTIS, PC A02/MF A01.

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  • Particle accelerator conference, Santa Fe, NM, USA, 21 Mar 1983

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  • Other: DE83009951
  • Report No.: LA-UR-83-704
  • Report No.: CONF-830311-72
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 6443129
  • Archival Resource Key: ark:/67531/metadc1208627

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1983

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  • July 5, 2018, 11:11 p.m.

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  • Oct. 18, 2018, 5:13 p.m.

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Lysenko, W.P. Errors in radio-frequency quadrupole structures, article, January 1, 1983; United States. (digital.library.unt.edu/ark:/67531/metadc1208627/: accessed November 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.