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: 00 ish

Gianluigi’s previous (3 x layer) box internal dimensions sketch 60 mm H(mm)-W(mm)-L(mm) = 220 -120 -250 100 mm 25 mm 20 mm Source Detector PM 22 mm Electronics/repeater board 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 H 6780). Latyeral dimensions about 12 cm.

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 R 1248 nonhydrocarbon 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

Questions/ideas etc Assuming that a generic box will be favoured also the most difficult to achieve. • Daughter board dimensions: Are they now fixed at 84 x 72 mm (ALIBAVA) • To accommodate maximum size of 100 x 100 mm + FEE hybrid / module, do we have a minimum? • 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. • Is the digital SCT 128 A dead and buried? • Si sensor sizes, how many are there out there? • Pumping system, is one required or a feedthrough added to box for facility? • Can a base mount be made for all sensors to be fitted to? It makes the generic idea more attractive then. • Use N²purge to drive dew point down if required. • • 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? • 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. • 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.

Generic solution Assuming 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!

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