NSLS Vacuum Experience Eugene J. Hu National Synchrotron Light Source Brookhaven National Laboratory Upton, NY 11973-5000 USA September 12-13, 2005 (prepared for presentation in the Workshop of Vacuum Systems for Future Light Source, Barcelona, Spain)
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NSLS Vacuum Experience Eugene J. Hu National Synchrotron Light Source Brookhaven National Laboratory Upton, NY 11973-5000 USA September 12-13, 2005 (prepared.
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NSLS Vacuum Experience
Eugene J. Hu
National Synchrotron Light SourceBrookhaven National Laboratory
Upton, NY 11973-5000 USA
September 12-13, 2005
(prepared for presentation in the Workshop of Vacuum Systems for Future Light Source,
Barcelona, Spain)
Proposed NSLS-II Vacuum Chamber at Ring Magnets with Gradient
NSLS-I Aluminum Vacuum Chamber
(aluminum-6061 vacuum chamber extrusion with standard cell-type distributed ion pump)
NSLS-I Water–cooled Ceramic Kicker Assembly
NSLS-I Pumping Record serves as Database for the NSLS-II UHV Optimization
NEG module/strip/coating (>200 l/s) to be considered for use at Linac (SS), certain IDs (AL), and most dipole (AL) chambers
TSP (400 l/s) along with Differential Sputter Ion Diode (>250 l/s) to be considered for use at and between the bending dipole locations
Plate-type Distributed IP (300 l/s) with Ti-cathode to be considered for use in the vacuum chamber slot at bending dipole magnet (vs. NEG on $)
Star Cell TM (100 l/s) to be considered for use at Linac, RF wave guides, certain IDs, and bent sections at ring (along with NEG)
(Assume vacuum pressure in dipole chamber during ring operation is ~10-9 torr after 100 Amp-hour of beam conditioning)
NSLS - II Vacuum Gauges
Partial Pressure Monitoring using RGA at location of
Ring’s Dipole (one) and its down-beam Cu-absorbers at crotch (one each)Linac (several along the 100-meter straight)Injection System (minimally one) RF Cavities (one each)Insertion Devices (one each)Optical-Diagnostic Sections (minimally one each)Beamline Front End (one, located between the Fast Valve and Safety Shutter)
Total Pressure Monitoring using Ion Gauge of
ConvectronTM – at Turbo Stations (key spot for rough-to-high vacuum sensing)Hot Filaments Nude or glass-shielded IG – along the ring (except ID position)Inverted Magnetron Cold Cathode – ID, mini-gap apparatus, along the ring (vs. NIG)