Slide 1

Michael Hoch / EP-AIT1 TPC Resistor Rod Slide 2 Michael Hoch / EP-AIT2 Resistor Chain: Design Constrains current per resistor chain: 241 A = 25W (total = 100W) Temperature stability of 0.1degree So cooling is required ! Slide 3 Michael Hoch / EP-AIT3 Liquid Cooling Tested liquids: Water, Silicon Oil, C 6 F 14, Result: No thermal problem, but high risk of gas contamination Slide 4 Michael Hoch / EP-AIT4 Gas Cooling Cooling capability of gases ~1000 times less efficient than liquids H 2 O: = 998 [kg/m 3 ], cp= 4190 [J/kgC] Air: =1.18 [kg/m 3 ], cp= 1007 [J/kgC] CO2: =1.81 [kg/m 3 ], cp= 844 [J/kgC] Different approach necessary Return cooling path Insulation around the rod Slide 5 Michael Hoch / EP-AIT5 Test Setup Thermal Box Return Rod: Cooling Gas: Air Slide 6 Michael Hoch / EP-AIT6 Setup Boundary Conditions Same dimensions like inner cooling rod Gas flow: 10m3/h Box temp: 20degree Coolant : air Slide 7 Michael Hoch / EP-AIT7 Rod Temperature Sensors inside rod coolant path: 1-6 Outside surface : 7-11 Slide 8 Michael Hoch / EP-AIT8 Gas temp. along the coolant path Slide 9 Michael Hoch / EP-AIT9 Outer Tube Surface Temperatures Slide 10 Michael Hoch / EP-AIT10 Temperatures around the Rod Slide 11 Michael Hoch / EP-AIT11 Rod with Double Wall Insulation Slide 12 Michael Hoch / EP-AIT12 Resistor Rod Validation Thermal & vibration test with small double wall proto type January 2002 HV & System tests with real size resistor rod Start: March 2002 Slide 13 Michael Hoch / EP-AIT13 Conclusion Thermal results of return rod design are promising Small prototyping helped to optimize the assembly Resistor Rods will be ready in time