Outgassing rate of the copper-plated beam tube for ISABELLE
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.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6466524
- Report Number(s):
- BNL-29217; CONF-810314-96; TRN: 81-007523
- Resource Relation:
- Conference: Particle accelerator conference, Washington, DC, USA, 11 Mar 1981
- Country of Publication:
- United States
- Language:
- English
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Outgassing and desorption of the stainless-steel beam tubes after different degassing treatments
Outgassing and desorption of the stainless steel beam tubes after different degassing treatments
Related Subjects
ISABELLE STORAGE RINGS
VACUUM SYSTEMS
BAKING
COPPER
DEGASSING
STAINLESS STEEL-304
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
ELEMENTS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HEATING
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
METALS
NICKEL ALLOYS
STAINLESS STEELS
STEELS
STORAGE RINGS
TRANSITION ELEMENTS
430400* - Particle Accelerators- Storage Rings