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Generic Cold box for ATLAS Upgrade Tracker Sensors

Generic Cold box for ATLAS Upgrade Tracker Sensors. ? My brain dump of stuff!. Richard French 17/04/08 11:00ish. H(mm)-W(mm)-L(mm) = 220-120-250. 60 mm. Source. 20 mm. 25 mm. 100 mm. 100 mm. Electronics/repeater board. Detector. PM. 22 mm. Scintillator.

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Generic Cold box for ATLAS Upgrade Tracker Sensors

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  1. Generic Cold box for ATLAS Upgrade Tracker Sensors ?My brain dump of stuff! Richard French 17/04/08 11:00ish

  2. H(mm)-W(mm)-L(mm) = 220-120-250 60 mm Source 20 mm 25 mm 100 mm 100 mm Electronics/repeater board Detector PM 22 mm Scintillator Sketch of possible dimensions of inside of cool-box, to accommodate 3 layer of detectors with 1 cm separation between them and equipped with source/trigger system (HPK PM series H6780). Latyeral dimensions about 12 cm. Gianluigi’s previous (3x layer) box internal dimensions sketch

  3. Cold box specifications • Based inside a standard -22°C commercial/domestic mini or full chest freezer. • Size depends on likelihood of using box for a full stave later on? • If the refrigerator compressor is permanently driven, we can use a 3200 or 3300 CAL controller with a solid state relay operating a electronic heater (pulsing from SSR) to keep the temperature control within +/- 0.5°C. Have made this work very well in past so not new stuff. • Changing from a standard R1248 non-hydrocarbon refrigerant gas to a hydrocarbon gas means an operating temperature of -34°C if required with the same accuracy. • Use of N² purge to drive dew point even lower if required. Current -30°C cold box used on ATLAS SCT

  4. Questions/ideas etc Assuming that a generic box will be favoured also the most difficult to achieve. • Cooling temperature, Is zero °C surface temperature cold enough or should we allow for lower running to match with future thermal environment aspirations? • Shielding, has a source been finalised as this could be built as part of a faraday cage. • Pumping system, is one required or a feed-through added to box for facility? • Use N²purge to drive dew point down if required. • Laser excitation abandoned for the moment as windows etc costly, stick with basic PM tube and radioactive source. • PMT tubes for excitation, what type and should 1 or 2 be used. Advantages disadvantages? • The CERN TC group (Michelle Batisin) are pushing for generic boxes for all CERN work. • Daughter board dimensions: Are they now fixed at 84x72mm (ALIBAVA) • To accommodate maximum size of 100x100mm + FEE hybrid / module, do we have a minimum? • Is the digital SCT128A dead and buried? • Si sensor sizes, how many are there out there? • Can a base mount be made for all sensors to be fitted to? It makes the generic idea more attractive then. • Can I use a finger to connect a Peltier device (fine control) to the sensor in these configurations, what physical contact is there to the sensor? • Is Valencia going to come up with the goods – DAQ R/O etc? • I want to leave as many options open (Laser, mulitwith the design to accommodate as many extras as and when people require them. In 2008/9 it may be the last year of good funding so is best to get a design that works and will be around for a few years.

  5. Generic solutionAssuming use of ALIBAVA daughter board? • Box internal sketch to be added. • New -34°C freezer (grey or white) plus CAL/SSR with electronic heater mods can be made for under £450! No food or fish dinners from Spain included!

  6. Specific Solution • Sketch to be added • New New -34°C large freezer plus CAL/SSR and electronic heater can be made for under £600

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