1. Itzhak Tserruya, BNL, Aug. 11, 20041 Itzhak Tserruya Weizmann Institute, Israel BNL, Upgrades Meeting, Aug. 11, 2004 HBD: Infrastructure and Integration

2. Itzhak Tserruya, BNL, Aug. 11, 20042 Detector location and size Location: around the beam pipe, occupy space from r=5 cm to r=61 cm. Acceptance (active area larger than central arm acceptance): - in z direction |η| ≤ 0.4 : z = 45cm - in φ direction Δφ = 100 o at r = 55 cm: s = 96 cm Segmentation: - along the beam axis: 2 pieces - along the azimuthal axis: 4 pieces Total: 16 detector elements 23 x 26 cm 2 each

3. Itzhak Tserruya, BNL, Aug. 11, 20043 3d view 1195.8 937.9 629.1

4. Itzhak Tserruya, BNL, Aug. 11, 20044 Half a Detector Z: 629.1 mm X: 937.9 mm Y: 1195.8 mm

5. Itzhak Tserruya, BNL, Aug. 11, 20045 Gas, HV and LV Stainless steel pipes for CF 4 : gas in 1/2”, gas out 1”. + N 2 line. The HBD has a total of 112 SHV HV connectors:  Each ½ detector has 56 SHV HV connectors (28 on the bottom and 28 on the top).  i.e. 7HV per sector. These are supplied by two power supplies through resistive chain.  total of 32 HV cables from the HV rack to the detector. LV (not yet specified)

6. 6 Readout Board + Preamps Hybrid Preamps with line drivers ~ ¾” honeycomb Read pads ~ 3x3 cm 2 Preamp signals to shaper + ADC wires GEMs Being developed by BNL Instrumentation Based on IO-535 ± input signal ± 2.5 V output From C. Woody DC meeting 4.14.04 Need almost one full rack for the readout electronics

7. Itzhak Tserruya, BNL, Aug. 11, 20047 Material, weight radiation length The detector box is made of 3/4” thick honeycomb structures sandwiched between two G10 sheets ¼ mm thick. Entrance window: double mylar window 50 μ thick with inter volume flushed with N 2. Total radiation budget of detector box and electronics of about 1.5%. Total weight of app. 5kg per half detector.

8. Itzhak Tserruya, BNL, Aug. 11, 20048 Exploded view (old drawing)

9. Itzhak Tserruya, BNL, Aug. 11, 20049 3d view: detector closed (old drawing)

10. Itzhak Tserruya, BNL, Aug. 11, 200410 3d view: detector opened (old drawing)

11. Itzhak Tserruya, BNL, Aug. 11, 200411 Half a detector (old drawing)