Assembly and testing facility.

1. Assembly and testing facility. Sequence of operations Glove Box Evaporator Other needs Testing Sasha Milov March 9, 2005 Sasha Milov EC/DC meeting March 9, 2005

2. Sequence of operations: • @WIS: • Mechanical construction of the HBD volume • Gas leak tests • Framing GEMs • Testing GEMs • @SUNYSB: • Preparation of the of the CsI photocathodes • CsI quantum efficiency tests • Triple GEM amplification tests • Detector assembly • Electronics assembly • Gas leak tests • @BNL: • Integration into PHENIX • Commissioning • Operation Sasha Milov EC/DC meeting March 9, 2005

3. Assembly site. • DC assembly site: • Spacious • Not very clean, but can be done “reasonably” clean. • “Reasonably” is still not good enough for CsI • Need a Glove Box Sasha Milov EC/DC meeting March 9, 2005

4. What do we want form a Glove Box. • Glove box parameters considered: • approximately 2.5m long 1.3m wide, 1.5m tall • Three areas inside for Assembly, Storage and Preparation. • Humidity control system inside the box • ~250 l/h flushing gas system • Full size door on one side • Antechamber on the other side, preferably sustaining vacuum • Electrical and gas communications in/out • Detector positioning system inside the box • Shelves, boxes etc • Quotes: • There are preliminary quotes form several companies (Mbraun, Innovative Technology, CoyLab etc…) ranging about $40k before negotiations. • A “do-it-yourself” quote is probably slightly cheaper that that Sasha Milov EC/DC meeting March 9, 2005

5. Glove Box. Glove Box used at WIS (CoyLab)   “mbroun” Company, (and several others) Sasha Milov EC/DC meeting March 9, 2005

6. Evaporator (SUNYSB). • PRO: • Available, Close to assembly site. • Working, and was capable of producing several small photocathodes. • Can produce full size HBD photocathode (one per cycle) • CONS: • Originally a “target” evaporator not “optical”, therefore is not really clean. • Major problem is unreliability and diffusion pump which may send oil back into the vessel. • Expected to be significantly upgraded for HBD project. Sasha Milov EC/DC meeting March 9, 2005

7. Evaporator (JLab option). • PRO: • Rolls-Royce class evaporator. • Capable of producing several HBD photocathodes in one go. • No exposure to the air. • CsI QE control “in situ” • Cooperative crew. • CONS: • Not a domestic one. • Can be used but not on a regular basis Sasha Milov EC/DC meeting March 9, 2005

8. Other needs. • Gas system: • Needs quite simple gas system (cylinderreducerexhaust) for N2/Ar and CF4. Something we can put together in the tent at SUNYSB. • Other: • Tools, soldering station, consumables etc. • Electronics test bench • Vessel for triple GEM module testing. Sasha Milov EC/DC meeting March 9, 2005

9. Testing I. • Stainless steel prototype (WIS prototype): • Arrived to the US. • Requires CsI photocathode to be put on and assembly. • Will be ready for LEGs test scheduled at the end of March. • Major purpose to measure N0 (Nphotoelectrons). • FR4 prototype (BNL prototype): • Under gas flow right now, H2O and O2 readings in the morning: 19ppm and 12ppm after 5 days of N2 flushing. • Can be ready for LEGs test as well. • Major purpose is to study detector with realistic materials and electronics. Sasha Milov EC/DC meeting March 9, 2005

10. Testing II. • Full scale prototype (WIS): • Mechanically almost complete • To be shipped here after gas test and HV tests • Final assembly exercise • Gas testing • Gain aging tests • CsI QE degradation tests • Electronics testing • Major purpose: study detector in final configuration. Sasha Milov EC/DC meeting March 9, 2005