Actions for Outgassing rate of the copper-plated beam tube for ISABELLE [electronic resource].

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Outgassing rate of the copper-plated beam tube for ISABELLE [electronic resource].

Published
Upton, N.Y. : Brookhaven National Laboratory, 1981.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: 3 : digital, PDF file
Additional Creators
Brookhaven National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The ultrahigh vacuum system of the intersecting storage accelerator, ISABELLE, will consist of two interlaced rings of stainless steel beam tubes with a circumference 2-1/2 miles each. To obtain a good heat conduction during bakeout and to reduce the resistive wall instability during beam operation, a lmm thick copper coating will be electroplated to the outer surface of this 1.5 mm thick beam tube. To minimize the beam loss due to beam-gas collision, the pressure inside the beam tube is required to be 1 x 10/sup -11/ Torr (N/sub 2/ equivalent) or less. To achieve this ultrahigh vacuum, the outgassing rate of the 304 LN stainless steel tubes has been reduced to approx. 1 x 10/sup -13/ Torr. l/cm/sup 2/. sec by vacuum firing at 950/sup 0/C for one hour. However, during acid-bath electroplating of copper, significant amount of hydrogen will be reintroduced and trapped in stainless steel which will substantially increase the outgassing rate (to approx. 2 x 10/sup -12/ Torr . l/cm/sup 2/ sec). The outgassing characteristics of these copper-plated beam tubes are studied and discussed within the scope of diffusion and energy of activation. Methods to reduce the outgassing rate to an acceptable level (approx. 1 x 10/sup -13/ Torr . l/cm/sup 2/ . sec) are also given.
Report Numbers
E 1.99:bnl-29217
E 1.99: conf-810314-96
conf-810314-96
bnl-29217
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
01/01/1981.
"bnl-29217"
" conf-810314-96"
Particle accelerator conference, Washington, DC, USA, 11 Mar 1981.
Hseuh, H.C.; Gaudet, E.F.
Funding Information
AC02-76CH00016
View MARC record | catkey: 14700064