Evaluation of the colliding beam accelerator first string full cell vacuum system

Journal Article · Sun Apr 01 04:00:00 EST 1984 · J. Vac. Sci. Technol., A; (United States)

DOI:https://doi.org/10.1116/1.572702· OSTI ID:6735044

Foerster, C L; Briggs, J; Christianson, C; Stattel, P

The CBA (colliding beam accelerator, formerly know as ISABELLE) full cell magnet system consisting of six superconducting dipole magnets and two superconducting quadrupole magnets requires two separate vacuum systems. One, known as beam vacuum, operates below 3 x 10/sup -11/ Torr and the other, known as insulating vacuum, operates at less than 10/sup -7/ Torr to isolate cryocircuits from atmosphere and from the UHV beam tubes. The UHV bore tube is isolated from the 4.0 K magnet by 36 layers of superinsulation and insulating vacuum. Heat load measurements on the bore tube have been completed and found to agree with data obtained in smaller controlled experiments. Measurements of helium, accumulated on cryogenic pumped charcoal panels over many weeks, have verified sensitive helium mass spectrometer leak detection methods for vacuum integrity, proving sound design of the welded complex. The full cell was assembled and operated under conditions that would exist in the completed machine. Pressures below 2 x 10/sup -11/ Torr beam vacuum requirement and below 1 x 10/sup -7/ Torr insulating vacuum, were routinely achieved during all phases of the full cell operation and support systems testing.

• Research Organization: Brookhaven National Laboratory, Upton, New York, 11973
• OSTI ID: 6735044
• Journal Information: J. Vac. Sci. Technol., A; (United States), Journal Name: J. Vac. Sci. Technol., A; (United States) Vol. 2:2; ISSN JVTAD
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430400* -- Particle Accelerators-- Storage Rings
BEAMS
COLLIDING BEAMS
DESIGN
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
ELEMENTS
EQUIPMENT
FLUIDS
GASES
HELIUM
ISABELLE STORAGE RINGS
LEAKS
MAGNETS
NONMETALS
OPERATION
PERFORMANCE
PERFORMANCE TESTING
RARE GASES
STORAGE RINGS
SUPERCONDUCTING DEVICES
SUPERCONDUCTING MAGNETS
TESTING
ULTRAHIGH VACUUM
VACUUM SYSTEMS