NSLS Vacuum Experience Eugene J. Hu National Synchrotron Light Source Brookhaven National Laboratory...
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Transcript of NSLS Vacuum Experience Eugene J. Hu National Synchrotron Light Source Brookhaven National Laboratory...
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
Pump Type Speed UV/IR X-ray[N2 l/s] ea ea
DIP (Std U/X) 220/390 4 12DIP (Plate U/X) 280/496 4 4TSP 350 21 48SIP (DI) 440 0 3SIP (DI) 220 15 50SIP (DI) 120 1 2NEG (Module) 300 0 4NEG (Module) 150 2 1NEG (Strip) 200 2 2STAR Cell 45 0 2
UV/IR X-rayDistributed Ion Pumps 2000 6664Sputter Ion Pumps 3420 12650NEG Pumps 700 1750TSP 7350 16800
Speed [l/s] 13470 37864
Circumference [m] 51 170Speed/m [l/(sm)] 264 223
Pump Type
X-RAY
UV/IR33%
5%
18%5%
25%15%
44%
55%
Pump Type Speed UV/IR X-ray[N2 l/s] ea ea
DIP (Std U/X) 220/390 4 12DIP (Plate U/X) 280/496 4 4TSP 350 21 48SIP (DI) 440 0 3SIP (DI) 220 15 50SIP (DI) 120 1 2NEG (Module) 300 0 4NEG (Module) 150 2 1NEG (Strip) 200 2 2STAR Cell 45 0 2
NSLS-I X-Ring VUV-Ring and Booster-Ring
NSLS-I X-Ring Vacuum Gauges and Pumps in Magnet Lattices
NSLS-I X-Ring Superperiod 1
NSLS-I VUV-Ring Vacuum Gauges and Pumps in Magnet Lattices
NSLS-I X-Ring Sublimators (1994-2004)
Filament Status Fil CountLive No.Unknown 11 16%
1 3 4% 32 9 13% 183 31 44% 934 16 23% 64
70 178 Known Available280 Potential
64% Capacity Available
By superperiod, Number of TSPSP No Known Fil
1 11 16% 26 15%2 8 11% 21 12%3 7 10% 16 9%4 9 13% 23 13%5 10 14% 29 16%6 10 14% 25 14%7 7 10% 22 12%8 8 11% 16 9%
70 178
NSLS – II UHV Vacuum Pumps
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)