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Limits of the current VTCS

Limits of the current VTCS. Ann Van Lysebetten Bart Verlaat Martin van Beuzekom. pix module construction kick-off 09/11/2009.

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Limits of the current VTCS

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  1. Limits of the current VTCS Ann Van Lysebetten Bart Verlaat Martin van Beuzekom pix module construction kick-off 09/11/2009 VELO upgrade meeting 14/11/2008

  2. Limits & “bottlenecks” prim. System H2O 20C prim. System air Sec. System (freon) Tert. System (CO2) Tert. System (CO2) 20 stations * 10 Velopix -> 4 Watts/velopix = ~ 2W/cm2 • Limited by current compressor, freon injection, heat exchanger to CO2 • heat exchanger to freon? Detector waste heat (max 800W) Detector waste heat (max 800W) • Max massflow of pumps 18g/s • Min CO2 temp -30 C Heat Transfer to the module! DT > 15 ‘C 2

  3. Minimal upgrade allows ~ 6W/cm2 prim. System H2O 20C prim. System air Sec. System (freon) Tert. System (CO2) Tert. System (CO2) • new compressor, • new freon injection, • new heat exchanger to CO2 • If necessary new heat exchanger to freon Detector waste heat (max 2.5kW) Detector waste heat (max 2.5kW) • with CO2 massflow of 18g/s • min at -35 C • But! • to keep silicon at < -5 C lower temp needed if interface not changed! 3

  4. Cooling interface • Current cooling interface (cookie) is one of limiting factors • Try to integrate cooling pipe into module • But, no high pressure connectors in vacuum -> Orbital welding of module to cooling pipe Cut here

  5. Summary • Current system can cool up to 800W • With some modifications it can reach 2.5 kW • -> CO2 cooling plant can do the job! • Large DT due to large thermal resistance and long path • this means either lower CO2 temp needed • OUTSIDE range of current system • new freon/CO2 chiller, this has limits! • module on/off temp difference large • Integrate cooling pipe into module/station • shorter path, smaller DT over module • small temp differences on/off • connect modules to cooling system via orbital welding 5

  6. The VTCS cooling principle prim. System H2O 20C prim. System air Sec. System (freon) Tert. System (CO2) Tert. System (CO2) Detector waste heat (max 800W) Detector waste heat (max 800W) SP -25C Tertiary System: two phase accumulator controlled system Freon system 13 10 Flooded evaporator Heat out Condenser Heat out 2-Phase Accumulator Heat in 9 Heat in 2 5 Heat exchanger 1 Restriction Pump 7

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