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)