PUMPING IFE CHAMBERS * (5m R case) 1 C. A. Gentile, 1 C. Priniski, 2 J. Sethian, 1 W. Blanchard, 1 L. Ciebiera, 1 F. Dahlgren, 1 G. Gettelfinger, 1 C. Jun, 1 S. Langish 1 Princeton Plasma Physics Laboratory 2 Naval Research Laboratory HAPL University of Rochester/LLE November 8 - 9, 2005 * Please see poster: C. Priniski, et al. on VPS

1.29*10 6 liters 6.5m Toroidal Duct 5.72*10 6 liters 11m Laser Ports 1.58*10 6 liters 7m Laser Ports 6.11*10 5 liters 5m Plenum Ducts Chambers Evaluated for VPS

Requirements:

Design Parameters: –Employ commercial off-the-shelf (COTS) components to minimize costs. –Employ high efficiency turbo molecular pumps backed by roughing pumps. –Employ components which have good operational history in similar environments. –Develop an accurate cost estimate from vendors; detailed quotes. –Design system to transition to D-T operations with minimal modifications. –Design system to meet base pressure and operation pressure in accordance with 5 Hz and higher (10 Hz) repetition rate (burst) operation. –Employ components which have minimal maintenance requirements.

System Specifications: –5m R Target Chamber Dimensions Inner radius = 5 m Target chamber volume  523,600 liters Total laser duct volume  87,560 liters Total volume (with 40 beam ports)  611,160 liters –Target Chamber Pressures Operational base pressure = 0.5 mtorr Gas load  60 torr-liters/sec (10 Hz burst mode) Total system in-leakage < 1x10 -5 torr- liters/sec

Pumping Candidates TypeVapor Diffusion Pump Turbomolecular Pump (TMP) Cryogenic Capital CostLowModerateHigh Pumping Effectiveness Excellent MaintenanceHighLowHigh ReliabilityExcellent OperationSimple/ModerateSimpleModerate IssuesPossible backstreaming of oil onto optics and oil into foreline NoneGas loading on panels, pump time vs. regen time Other Concerns Large amount of high temperature oil at risk NoneLabor intensive operation Cost of OperationLow/Medium (oil at ~ $500/gallon) and cryogenic fluids LowHigh (energy/labor costs due to helium refrigeration and operations) Impact on operationOil on opticsNoneRegeneration time

Vacuum Pumping System: 5m R Target Chamber Pumping TMP pumping through plenum ducts TMP’s (Varian-V 6000) = 30 TMP’s /duct TMPS’s total =60 TMP backing pumps (mechanical & roots blowers) = 1/6 TMP’s Backing pumps total = 10 Outboard Beam Duct Pumping TMP’s (Varian-V 2000 HT) = 1/beam port TMPS’s total =40 System Pumpdown From 760 torr to 0.5 mtorr (initial conditions) < 1 day

Gas Holding Tank Gas Holding Tank Gas Holding Tank Gas Holding Tank Mechanical Booster Vacuum Pumping System Exhaust Stack Inventory Monitor/RGA Cryogenic Isotope Separation 2 Stage Metal Bellows Pump Waste or Recycled Waste Type B (>1080 Ci) Type A (<1080 Ci) Molecular Sieve Bed Containers Tritium Gas Process System (Catalytic Conversion to Oxide) Inventory Monitor Leak Mitigation Cleanup System Blowers Pumping System and Interface CHAMBER

VPS Two pump duct configuration Pump duct (nominal) 2m D, 10m L Two VPS Pods 30 TMP’s/pod TMP’s backed by backing pumps/blower

Laser Plenum Pumping Turbo-V 2000 HT 10” VAT Valve

Operational Pressure(s) Two pod (30 TMP’s/pod) configuration VPS (eff.)pumping speed ~ 182,000 l/sec Design Basis Pressure = 0.5 mtorr 5 Hz operation/gas 30 torr-l/sec, operational pressure = 0.16 mtorr 10 Hz operation/gas 60 torr-l/sec, operational pressure = 0.33 mtorr

Commercial Off-The-Shelf Dome (prefab) Candidate

Vacuum Pumping Pod (TMP) Configuration

Pod (Bottom) Flat Plate

Pod (Clam Shell) Configuration

Vacuum System Component Cost Estimate