Upgrade sensor meeting Coolbox for testing detectors/modules/staves Liverpool University 18th April 2007 Richard French Richard French

Coolbox concept: proposal parameters Stave or Module or both? Capability to reach SLHC operating temperature -25/30 oC). Given starting point using a module box (hybrid dimensions are about 9cm2). Dimensions and power issues are critical, If the design is for a stave, the cooling problem changes significantly. 13/01/2019 © The University of Sheffield / Department of Marketing and Communications

Idealistic concept: Bespoke portable cold chamber Box like structure from Aluminium clad thermally isolating foam – good for low noise and gnd. Unit would house all readout devices or simple USB hub to link to control PC Standard refrigerant gas system Dry gas feed to internal manifold through pressure reg to alter DP Peltier device to fine tune device temperature control either pc readout or built in, need to explore costing further with both options. USB device price unknown – awaiting info from supplier. Kinematically mounted XY (Z?) translation stage for module (motorised-PC control?) Anti-vibration mounts to isolate compressor or site compressor away from cold chamber under bench etc USB-PC control for readout or built in control system but either possible (cost?) No windows to the outside for Laser. Save condensation problems for window - Instead would prefer to use a 960nm (is spec correct?) Fibre coupled laser system, or customised with Pigtailed Laser Diode Module -1metre of single mode fibre - Diode driver –Board –P.S -Thermal kit all standard equipment for build such as this widely available from most optics manufacturers <£3k+vat - £400 to £2800 depending on supplier Would mount the lens on a Z translation stage if required to adjust focal length/spot diameter etc Can have USB readout/control for Laser input power – possibly link to PC control or build in to box All PC control options use existing proven USB devices. Cost coming down and may be a significantly cheaper option as opposed to a built in device in terms of labour. Interlock on access door for laser 13/01/2019 © The University of Sheffield / Department of Marketing and Communications

Idealistic concept: Bespoke portable cold chamber. Advantages: Dimensions and operating temperature are not such a big factor Refrigerant system is inexpensive and reliable Subsequent repair or modifications can be done anywhere Have been produced regularly at Sheffield -expertise is not an issue Opportunity to make a working model or prototype and modify for final design should specifications change mid way (as usual). To produce multiple boxes becomes significantly easier Disadvantages ~Cost <£10k Time taken to make prototype then final production box 13/01/2019 © The University of Sheffield / Department of Marketing and Communications

Basic concept: Modified cold chamber using domestic freezer unit Structure made from existing domestic freezer. Modified compressor/condenser and refrigerant gas to meet our specification Dry gas feed and pressure reg Peltier device to fine tune device temperature control Kinematically mounted XY translation stage for module USB-PC control No windows to the outside for Laser as before (this really is the way to go as you don’t need windows to lase through and has very good thermal shock properties). ?nm Pigtailed Laser Diode Module utilising 1metre of single mode fibre, Diode driver, board, power supply and Thermal kit – standard equipment from most optics manufacturers ~£400+vat Would mount the lens on a Z translation stage if required to adjust focal length/spot diameter etc Utilise existing laser driver for power readout All PC control options use existing proven USB devices. Cost coming down and may be a significantly cheaper option as opposed to a built in device in terms of labour. Interlock on access door for laser to existing laser driver 13/01/2019 © The University of Sheffield / Department of Marketing and Communications

Basic concept: Modified cold chamber using domestic freezer unit Advantages Most of the hard work is done saving huge amounts of time. Have made plenty of these Low cost in development terms – maybe a suitable test bed for a full custom unit. Reliability (to an extent depending on modifications) Disadvantages Dimensions will not meet specification Not exactly pushing the boundaries of technology or getting even close Long cooling/warming periods Bulky and unattractive Attaching readout devices becomes messy – need a feed-through and then all individual readouts linked separately. 13/01/2019 © The University of Sheffield / Department of Marketing and Communications

Things to stick with to save BIG trouble Using a patch cord based laser and ditching windows to lase through – safer too! Full PC control or separate readout units not a combination of both Peltier device is proven for these applications and ultra reliable Use a standard configuration for refrigerant system, we do not need exotics for this purpose. 13/01/2019 © The University of Sheffield / Department of Marketing and Communications

Unknown information needed to start a comprehensive design Laser specification, I have 960nm from somewhere but this is very close to IR, if we need to increase power then the whole system needs to be ditched. Typical sensor operations are in the 1540nm region. Laser spot size crucial to mounting positions as determined by focal length > determines laser type as power need to increase x distance. Dimensions of module or stave etc Is the given temp range ok or do we want to go colder/warmer? Humidity control? What DP is required? Vibration spec Noise from components – compressor etc Size of readout equipment/connections to the detector all alters the height and positions of components and the overall size? 13/01/2019 © The University of Sheffield / Department of Marketing and Communications