Beam tube vacuum in future superconducting proton colliders
- Superconducting Super Collider Laboratory, Dallas, Texas 75237 (United States)
The beam tube vacuum requirements in future superconducting proton colliders that have been proposed or discussed in the literature---SSC, LHC, and ELN---are reviewed. The main beam tube vacuum problem encountered in these machines is how to deal with the magnitude of gas desorption and power deposition by synchrotron radiation while satisfying resistivity, impedance, and space constraints in the cryogenic environment of superconducting magnets. A beam tube vacuum model is developed that treats photodesorption of tightly bound H, C, and O, photodesorption of physisorbed molecules, and the isotherm vapor pressure of H[sub 2]. Experimental data on cold tube photodesorption experiments are reviewed and applied to model calculations of beam tube vacuum performance for simple cold beam tube and liner configurations. Particular emphasis is placed on the modeling and interpretation of beam tube photodesorption experiments at electron synchrotron light sources. The paper also includes discussion of the constraints imposed by beam image current heating, the growth rate of the resistive wall instability, and single-bunch instability impedance limits. [copyright] 1995 [ital American] [ital Institute] [ital of] [ital Physics]
- DOE Contract Number:
- AC35-89ER40486
- OSTI ID:
- 6559645
- Journal Information:
- AIP Conference Proceedings (American Institute of Physics); (United States), Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Vol. 326:1; ISSN 0094-243X; ISSN APCPCS
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
430400* -- Particle Accelerators-- Storage Rings
BEAM TRANSPORT
BEAMS
BREMSSTRAHLUNG
CARBON
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
DESORPTION
ELECTROMAGNETIC RADIATION
ELEMENTS
HYDROGEN
IMPEDANCE
INSTABILITY GROWTH RATES
LINERS
NONMETALS
NUCLEON BEAMS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PARTICLE BEAMS
PROTON BEAMS
RADIATIONS
SORPTION
STORAGE RINGS
SUPERCONDUCTING SUPER COLLIDER
SYNCHROTRON RADIATION
VACUUM SYSTEMS