Thermal design of drift tubes for high-gradient linacs

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We designed high-intensity drift tube linacs at Los Alamos using copper drift tubes capable of very high duty-factor operation, limited only by beam-loss heating in the bore. The drift-tube bodies are cooled by a peripheral, full-length cooling jacket that effectively clamps the drift tube at the average coolant temperature and shields the samarium-cobalt quadrupole from excessive heating caused by rf dissipation. The bore tube is thick-walled copper that is split to provide a gap for thermal-expansion, beam-diagnostic instrumentation, and vacuum relief of the drift-tube body. The magnet pole pieces are isolated from the bore tube by a 0.2-mm thermal gap ... continued below

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Pages: 3

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Liska, D.J.; Bultman, N. & Carlisle, L.O. January 1, 1986.

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Description

We designed high-intensity drift tube linacs at Los Alamos using copper drift tubes capable of very high duty-factor operation, limited only by beam-loss heating in the bore. The drift-tube bodies are cooled by a peripheral, full-length cooling jacket that effectively clamps the drift tube at the average coolant temperature and shields the samarium-cobalt quadrupole from excessive heating caused by rf dissipation. The bore tube is thick-walled copper that is split to provide a gap for thermal-expansion, beam-diagnostic instrumentation, and vacuum relief of the drift-tube body. The magnet pole pieces are isolated from the bore tube by a 0.2-mm thermal gap that is very effective in preventing beam-loss heating from degrading the magnet properties of the quadrupoles. We discuss thermal studies that explore the capabilities of this design concept. The design features of the quadrupoles include a technique for precision shimming using captive screws and guide slots. We also present results of tests on prototype quadrupole assemblies.

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Pages: 3

Notes

NTIS, PC A02/MF A01; 1.

Source

  • Linear accelerator conference, Stanford, CA, USA, 2 Jun 1986

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  • Other: DE86011246
  • Report No.: LA-UR-86-1684
  • Report No.: CONF-860629-9
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5596317
  • Archival Resource Key: ark:/67531/metadc1092850

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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, 1986

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  • Feb. 10, 2018, 10:06 p.m.

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  • May 31, 2018, 1:06 p.m.

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Liska, D.J.; Bultman, N. & Carlisle, L.O. Thermal design of drift tubes for high-gradient linacs, article, January 1, 1986; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1092850/: accessed July 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.