Electron storage ring beam lifetime dependence on pressure and pumping speed

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The beam loss in electron storage rings depends to a large extent on the interaction of the beam with heavier residual gas molecules such as CO, CO/sub 2/ and A due to Bremsstrahlung and Coulomb scattering. The gas density inside the vacuum chamber is determined by the surface condition of the vacuum chamber which is bombarded by photons (synchrotron radiation) generated by circulating electron beams and by the installed pumping. During the spring shutdown the x-ray ring vacuum system was updated and baked out. Residual gas spectra obtained were typical of a well baked out system, i.e., hydrogen constituted approx. ... continued below

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Pages: 19

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Halama, H.J. January 1, 1984.

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Description

The beam loss in electron storage rings depends to a large extent on the interaction of the beam with heavier residual gas molecules such as CO, CO/sub 2/ and A due to Bremsstrahlung and Coulomb scattering. The gas density inside the vacuum chamber is determined by the surface condition of the vacuum chamber which is bombarded by photons (synchrotron radiation) generated by circulating electron beams and by the installed pumping. During the spring shutdown the x-ray ring vacuum system was updated and baked out. Residual gas spectra obtained were typical of a well baked out system, i.e., hydrogen constituted approx. 95% of the gas and the average pressure was in the 10/sup -10/ Torr range. During initial operation the composition of desorbed gases was 43% H/sub 2/, 25% CO and 16% CO/sub 2/ and CH/sub 4/. After 3 months of beam conditioning desorption dropped by a factor of 5 and the CO, CO/sub 2/ and CH/sub 4/ peaks represented smaller percentage of total desorbed gas. Beam lifetime did not, however, show a corresponding increase. The pumping speed of distributed pumps dropped to zero at 1 x 10/sup -9/ Torr pressure but increased rapidly from approx. 20l/s in low 10/sup -9/ as the pressure increased.

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Pages: 19

Notes

NTIS, PC A 02/MF A01.

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  • 31. national vacuum symposium, Reno, NV, USA, 3 Dec 1984

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  • Other: DE85003208
  • Report No.: BNL-35401
  • Report No.: CONF-841218-6
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 6136060
  • Archival Resource Key: ark:/67531/metadc1104887

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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, 1984

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  • Feb. 22, 2018, 7:45 p.m.

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  • April 24, 2018, 1:22 p.m.

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Halama, H.J. Electron storage ring beam lifetime dependence on pressure and pumping speed, article, January 1, 1984; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc1104887/: accessed May 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.