1. 1 HBD: Update and Schedule Itzhak Tserruya DC Meeting, BNL, April 13, 2005 Outline:  Full scale prototype status  Light source test  Construction Schedule

2. 2 Full-scale prototype Construction completed: no major problem with construction procedure or with jigs ready to go for final design Presently studying gas purity and window configuration. Only inner window glued. Outer window attached with masking tape.

3. 3 Full-scale prototype 200 l/h N 2 flushing Single window 50 micron thick is not enough Can reach less than 10 ppm water within couple of weeks. need a few weeks to complete the window studies and decide on configuration: - single window of ~100  thickness - 2x50  window without N 2 flushing - 2x50  window with N 2 flushing

4. 4 Acceptance |  | ≤ 0.45  = 135 o |  | ≤ 0.36  = 104 o

5. 5 Light source test GOAL: direct measurement of N 0.  Trigger counters installed and aligned.  DAQ OK  Detector vessel, radiator and detector module with CsI photocatode sent from WI to BNL.  CsI measured at BNL and found consistent with measurement at WI  Gas system and transmission through radiator  Urgently need of glove box for detector assembly

6. 6 Schedule: 1. Detector construction  Goal: Detector ready for Run-6.  Working hypothesis: Run-6 is delayed, starts Jan 2006.  HBD construction: A. WI: - Detector and jigs design: 2m start May 1 st  end June - Vessel construction: 3m start June 1 st  end August. - Framing and pretest of GEM foils: schedule dictated by foil delivery from CERN scheduled to start May 1 st @ 30 foils/month  assume total delivery time of 4m. Work start June 1 st  end September. Shipping to SBU start July 1 st  end October. B. SBU: - Set-up of assembly and test facility should be completed by July 1 st. - CsI evaporation and module test proceed in parallel in assembly line fashion. Work start July 15  15 November. - Final detector assembly and test November – December. - Full detector ready for installation Jan. 2006. Critical items: - freeze acceptance and GEM size - freeze design and produce motherboards

7. 7 Schedule: 2. Electronics Pre-amplifier production: - First batch of 200 pre-amps already produced - Production start July, complete in 1-2 months FEM production: - FEM prototype ready end of May 3m test  end August - FEM production: begin September 2005  February 2006 - FEM test and installation Gas system: - Construction start after Run-5, complete in 2 months Monitoring systems: - 4m delivery time, ready in September Infrastructure (gas pipe, HV, LV): - start after Run-5 Schedule: 3. Gas, monitor, infrastructure