IFE TARGET CHAMBER VACUUM PUMPING SYSTEM 11m Radius Case

1. IFE TARGET CHAMBER VACUUM PUMPING SYSTEM11m Radius Case 1C. Gentile, 1C. Priniski, 2J. Sethian, 1R. Parsells, 1S. Langish, 1L. Ciebiera, 1W. Blanchard, 1R. Yager, 1C. Jun 1 Princeton Plasma Physics Laboratory 2 Naval Research Laboratory 12th HAPL Meeting, Lawrence Livermore National Laboratory June 20-21, 2005

2. Requirements: Email correspondence .: J. Sethian “11 meter radius IFE Target Chamber”, May 12th, 2005.

3. 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 operation.

4. System Specifications: • Target Chamber Size • Inner radius = 11 m • Target chamber volume  5,575,279 liters • Total laser duct volume  150,796 liters • Total volume (with 60 beam ports)  5,726,085 liters • Target Chamber Pressures • Operational base pressure = 0.5 mtorr • Gas load = 141 torr-liters/sec • Total system in-leakage = 1x10-5 torr-liters/sec

5. Target Chamber

6. Vacuum Pumping System: • Target Chamber Pumping • TMP pumping through (laser port) beam ducts = 60 • TMP’s (Varian-V 6000) = 2 TMP’s /duct • TMPS’s total =120 • TMP backing pumps (Kinney KMBD-2000) = 1/6 TMP’s • Backing pumps total = 20 • Outboard Beam Duct Pumping • TMP’s (Varian-V 2000 HT) = 1/beam port • TMPS’s total =60 • TMP Heat Loading • Gas Load T=1000K–4000K, no operational effect • System Pumpdown • From 760 torr to 0.5 mtorr (initial conditions)  18 hrs

10. Laser Duct Pumping Continued GIMM Beam Tube "Vacuum" Window HeliflexGaskets K B 10” VAT Valve Turbo-V 2000 HT E

21. Vacuum System Costs