TPC-Meeting : Københaven 2.9.02

1. TPC-Meeting : Københaven 2.9.02 • Ne-CO2 Gas System : Status • CO2 - Gas System : Insulating Gap • Resistor Rod : • Contacts • Cooling --> Liquid • Cooling --> Gas

2. Ne-CO2 - Gas System : • Mixing Unit ok • Compressor Rack ok • Cleaning Cartridges ok • Pressure Tank ok • CO2 - Remover prep • Hardware ready --> Jan 2003 • Slow control --> mid 2003

4. Ne-CO2 - Gas Quality Controls • CO2 - Monitor (0.1%) --> permanent • 2(O2 & H2O) -Monitor’s --> permanent • 2 Goofie - Drift-Monitors --> permanent • Drift vel : < 1 %o • Gas (in & out; mounting: near TPC-vessel) • Gas Chromatograph --> if needed • N2; impurities(CHn; SF6 ; ect.);

5. CO2 - Insulation Gap Gas System • CO2 - Recovery : • Closed System • Design Meeting --> Alice week: sept.02

6. TPC_Resistor Rod • Promised : • Weight Watching & Contacts : • *1/4 & 100 cm Model • Cooling Tests : • 100 cm Model • HV & Security Tests : • 200 cm Model

7. Contacts

8. Water flow

9. Cooling Efficiency :--> T.M --> BTC !

10. Rod - Cooling Systems • Leakless Water Cooling • Control System : like FEC’s • 10 mm Pipes • Cost : 25 kSFR • CO2 - Gas Cooling • 60 mm Pipes & 50 m • Leaks into Ne_CO2 Volume ??? • Cost : (30 components + 30 labor (?) + • 20 heat exchanger ) --> 80 kSFR (?)

13. Rod-HV- Tests • 300 kV HI-Injector @ GSI • 30 Years of HV-Operation • With : • Distilled Water-Resistor Chain

18. 300 kV GSI Ion Source : • Uses since 30 years : • Destilled Water Channel as 300kV Divider • Interlock : Water Quality • < 2 µ Siemens / cm Resistor Rod HV test : • Rod-Cooling Water Channel --> • Connected to HV with Copper-Return Bridge • Additonal parallel resistor : --> f(water quality) Are’s test setup:

27. HV-Test @ GSI HI - source • Rod in Nitrogen Atmosphere • Rod filled with : • Nitrogen • Distilled Water ( < 0.1 & <1 µ Siemens) • Circulation Pump OFF • Tap - Water • ∂V_last Resistor • & Total Rod Current

33. Conclusions : I • Removable Resistor Rod : • Possible --> go_to --> 250 cm • AGC --> • very efficient -> results soon • Price & Space • Liquid Cooled Rod : internally save : • HV & Leak • Ceramic Bridge --> Security Factor: * 1015 • Rod Resistivity = f (water quality) --> adjust !

34. Conclusions : II • Remaining Heat Sources in TPC • G_Ohm Resistor Chain -> up to 4 Watt Let’s Cool them !!!

35. 4W - Distilled Water Resistor Chain • Adjust Water Quality : • --> (0.05 and 2) µ_Siemens • ( 18 --> 0.5 ) M_Ohm / cm • TPC Gas Heat Problem gone !