HBD Plans for run-6 Itzhak Tserruya DC meeting

HBD Plans for run-6 Itzhak Tserruya DC meeting, BNL, October 12, 2005 • HBD status • Plans for run 6 ( Back-up: details presented in Upgrades meeting yesterday) 1

HBD global schedule 2

HBD plans for Run 6 • We plan to test the HBD in run-6. • The best would be to test it first with p+p collisions and then with Au+Au. But if run-6 starts with Au beams then we will reverse the order. In that case the plan is to install the HBD toward the end of the Au+Au period, in April 2006. • From our present assessment, we should have ** at least ** one of the two HBD boxes partially instrumented. The precise configuration will depend on the availability of readout electronics: - minimum configuration: one box with one detector module - maximum configuration: one box fully instrumented 3

Back-up (As presented at the Upgrades meeting yesterday) • • Full-scale Prototype status Safety Review Detector box construction GEM production Stony Brook test and assembly facility Gas system Analog electronics Digital electronics 4

Full scale prototype status • Gas tightness test at WI: leak rate 2. 3 cc/min ~4 ppm of water (2 ppm from gas pipes) • Triple GEM detector installed and tested inside the prototype in CF 4 with Fe 55 source. • Shipped to BNL: leak during transport? leak rate now ~20 cc/min Plans: • Install readout board on back of prototype • Install preamps (old design) and do electrical tests to study signals with • test pulse, noise, etc. • Prepare and install a Cs. I photocathode into the detector 5 • Test GEMs with Fe-55 and UV-lamp

HBD Safety Review • Took place on September 15 • No major issues. • Additional documentation requested for: - HV PS - signal cables (appropriate flame and cable tray ratings) - aramid honeycomb is the same as nomex - SHV connectors • Provide plan to limit the HV PS to 5 KV 6

HBD construction status • All raw materials (FR 4 sheets, honeycomb, HV resistors, HV connectors) ordered and most of them in house • Detector box design fully completed • Jig design underway • Small parts (insert, pins, screws, HV holders. . ) in the shops • Detector construction to start Nov. 1 st • PCB design almost complete • Detailed construction schedule foresees shipment of boxes to SUNY in January 2006. 7

PCB design • Constraint on maximum number of pads: 1152 pads per arm or 192 pads per panel • Would be much easier to have a round number like 1200 pads per arm or 200 pads per panel not possible • We found a solution in which each panel has 192 pads and yet all six panels are identical. 8

GEM production • GEM final order placed: - no changes wrt to pilot production - 65 standard GEMs - 35 Au plated GEMs - 100 frames • First batch (app. 1/3 of the total) - 20 standard + 10 Au plated + 30 frames completed at CERN and shipped to WI. • Gluing to frame, mounting HV resistors, and test of triple GEM modules with Fe-55 ready to start at WI • First shipment of tested triple GEM modules to SUNY in 2 nd half of November. Last shipment in mid-February 2006 9

SB assembly and test facility status • Clean tent ready • new filters/light in • services (3 -phase power, water, valve pressure) ready • Glove box specifications defined • bid process started a few weeks ago • Glove box and evaporator from Jeff Lab are being moved to SB. 10

GLOVE BOX Specifications § Type: Dry Nitrogen Glove Box – v v v v § Size (Interior): length 3 m min. , width 1. 2 m max. , height 1. 3 m min. v § § § 3 working sections Storage [Middle] Gem Working area [Next to airlock] HBD Assembly [Hatch] Air lock [or Transfer Chamber] v v v § H 2 O <10 pmm, Particle Level <100/m 3 , Dehumidification Column with HEPA filtration, Monitoring Instruments H 2 O, O 2, Pressure Range +- 10 milbar, N 2, leakage 0. 05%vol/h, N 2 Flow +250 l/Hr N 2 From Boil off From Liquid N 2, with Backup Cylinders Automatically engaged Overpressure Vent, 4 Swagelock Fittings on each end to control gas Flow According to work. 46 cm to 60 cm Dia. , GEM Shipping Box, and Cs. I Deposition Transfer Case can Pass Thru. Maybe Pumpable, if not then a Pump Through System maybe used] Fitted with N 2 Feed, Exhaust, KF-40 mm Vacuum, and H 2 O Measurement Feedthroughs Panels: Located at Box ends and at center position v 120 VAC- 2 quad outlet Boxes with Power Strips, v Signal & HV, Gases on replaceable Panels v Gases on replaceable Panels Lighting: Exterior and Interior Spot lighting Glove Ports – Sealable, v 8 Pairs of Glove ports, 6 pairs set evenly along the length of the Box, the 7 th and 8 th set above the 2 pairs next to the hatch, which is were we will assemble the HBD 11

TH @ Jefferson Lab 12

HBD Gas System Simplified Single pass system for Run 6 Total detector volume: ~ 626 l (313 l each side) Flow rate: ~ 60 l/hr ( ~ 150 l/hr purge) Extensive gas monitoring to maintain O 2 and H 2 O levels to a few ppm • Gas pipes installed • Most components ordered or in house Pure CF 4 R. Pisani 13

Gas Monitoring Gas monitoring near detector (under stairs by labyrinth) • H 20 • O 2 • VUV transmission D. Lynch Mc. Pherson 234/302 VUV spectrometer - uses pure argon as reference gas (no vacuum) - completely enclosed 30 W D 2 lamp 14

New Preamp Design • ~ ½ the area of the previous version of the preamp (0. 76” x 0. 57 “) • Uses small Samtec connector • Uses new op amp with lower bandwidth which is less prone to oscillatio Considerable reduction in radiation length from 1. 6% to 0. 6% 15

Schedule for New Preamps • Basic design done by Joe Harder (while home recuperating from surgery !) • Small prototype order (~ 200 pieces) placed (should take ~ 3 weeks) • Test prototypes for oscillation, noise, etc (~ 1 week) • Final design could be sent out within 1 month • New readout board design in parallel small changes to accommodate the new connectors should be ready in 3 -4 weeks from now 16

Updated HBD FEM Diagram v. For Clockmaster, clock fanout, ADC and backplane, we either have (or will have in 1 -2 days) the blank boards. These boards will be assembled soon. v. Optical out – Design is done (not submitted) v. New DCM daughter card design is underway. Crate Backplane (7 blank boards, 4 crates+ 1 spare+ 2 test stands) Clock fanout ADC Optical out Test pulse (25 blank boards. We have major of the parts for 5 boards) (4 blank boards, 1 needed + 1 spare+ 2 test stands) Clock Master New Daughter card + DCM GTM/Ethernet C. Y. Chi 17