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HBD Update of activities at WI

HBD Update of activities at WI. Itzhak Tserruya HBD meeting, BNL, August 31, 2005. GEM production HBD box design PCB design. 12 GEMs (9 standard + 3 Au plated) and 15 frames. GEM pilot production (I). Tooling for GEM stretching: same as for full scale prototype.

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HBD Update of activities at WI

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  1. HBD Update of activities at WI Itzhak Tserruya HBD meeting, BNL, August 31, 2005 • GEM production • HBD box design • PCB design

  2. 12 GEMs(9 standard + 3 Au plated) and 15 frames GEM pilot production (I) • Tooling for GEM stretching: same as for full scale prototype. • Tooling for gluing GEM on frame designed, constructed and successfully used. GEM Stretching device Frame

  3. GEM pilot production (II) • 3-GEM stack assembled: • - 2 standard GEMs  OK • - 1st Au plated failed, 2nd Au plated OK • - successfully tested with 55Fe • All other 8 GEMs are framed, equipped with • surface mount resistors and ready to be tested. No single discharge occurred

  4. GEM production • GEM final order placed: • - no changes wrt to pilot production • - 65 standard GEMs • - 35 Au plated GEMs • - 100 frames • Expected delivery rate: • - 20 standard + 10 Au plated + 30 frames per month. • - negotiating shipment every 2 or 3 weeks. • QA: CERN will continue pre-testing of GEMs prior of shipment. • But will replace any GEM found defective in the tests at WI.

  5. HBD final design: changes wrt prototype From July’s presentation All have been made • Several changes are being made in the design of the final HBD wrt the prototype. The changes are made: • to reduce the z envelop of the detector • in response of lessons learned from the prototype • The main changes are: • a single 100 micron window instead of a 2x50 micron window • thinner covers, ½” honeycomb instead of ¾” in the prototype  gain 2 x 6 mm in the z envelop • a thin FR4 frame all around the covers  prevents deformation of the covers at the places of the screws. • head of the screws immersed inside the frame  gain 2 x 4 mm in the z envelop • the z envelop is now 656.4 mm (down by 23.6 mm from the original value of 680 mm) • more symmetrical shape, closer to two half cylinders • 6 mm clearance between the two halves of the detector

  6. Clearance +/- 3 mm Z= 656.4 mm HBD final design 2x21 HV connectors serving 2x3 detector modules Gas out Removable window FR4 frame all around the cover

  7. HBD exploded view

  8. HBD final design • We have reconsidered again the nominal vs the retracted position. Nominal position Retracted position • Propose to keep the design optimized for the nominal position.

  9. 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. • If this is not possible: • a) we will have to reduce the number of pads • or • b) we will not instrument all of them.

  10. Another attempt to measure N0 ? • We are exploring the possibility to measure N0 at PSI. • There could be a 3 week time slot at the end of October beginning of November in the PiE1 beam line. • Currently investigating the logistics.

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