Don Lynch 9/15/05 HBD Safety Review 1

Mechanical

Design And Installation

Hadron Blind Detector (HBD)

Don Lynch

Don Lynch 9/15/05 HBD Safety Review 2

HBD General Features– Detector surrounds beampipe in Central Region

– Gas tight enclosure using CF4.

– SS gas piping for high gas purity routes through sill.

– Transparency monitor in cabinet under South stairs.

• Continuous gas monitoring

– Alignment

– Precision: X, Y, Z : +/- 1.0 mm pitch, roll, yaw : +/- 1.0 mrad

– Repeatability: X, Y, Z : +/- 1.0 mm pitch, roll, yaw : +/- 1.0 mrad

– Stability: X, Y, Z : +/- .05 mm pitch, roll, yaw : +/- .05 mrad

– Install in Tight Position…move to retracted position when VTX is installed

– 12 detector modules per arm

– 48 HV cables from rack on Bridge to distribution boxes 168 shorter cables from dist box to detectors (21 each for north/south, up/down, east west)

– 24 LV & 2304 coax pair signal cables to old MVD rack distributed along the north and south arcs for the east and west arms to the 24 panels

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Materials of ConstructionPer Detector Enclosure:

Mylar coated with Al ("Sheldahl") 0.02 kgStainless Steel Mesh 0.19 kgGEM detectors ("CERN“, Cu coated Kapton) 0.50 kgPCB ("CERN“, Cu coated Kapton) 0.23 kgFR4 (Gem frames, inserts, enclosure frames) 8.20 kgAramid Fiber Honeycomb (“Plascore”) 1.27 kgPlastic screws 0.14 kg Delryn Screws 0.05 kg“Swagelok” Stainless gas connectors 0.32 kgSHV connectors (“Huber-Suhner”) 1.76 kgInternal HV wire (“Huber-Suhner”) 0.42 kgInternal signal wire (“Huber-Suhner”) 0.12 kgBanana connectors Total per detector enclosure 0.08 kgSMD HV resistors (“Welwyn Components”) 0.20 kgVoltage Divider resistors and Connectors 0.20 kg

Total per enclosure 13.70 kg

Additional assembly wt 10.00 kg

Total for entire detector assembly 37.40 kg (82.3 lb)

Don Lynch 9/15/05 HBD Safety Review 4

HBD final design

Z= 656.4 mm

Clearance +/- 3 mm

Gas out

2x21 HV connectors serving 2x3 detector modules

Removable window

FR4 frame all around the cover

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HBD exploded view

Window & Frame

Detector Modules

HV Connectors

Framing

Honeycomb

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Panel construction

• The detector vessel has a polygonal shape formed by panels glued together

• The panels behind the HBD active area consist of a 0.25 mm thick FR4 sheet and a 0.5 mm multilayer motherboard glued under vacuum to a ¾” thick honeycomb core

• The other panels, outside the active area, are made of honeycomb sandwiched between two 0.25 mm thick FR4 facesheets

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InstallationHV Rack on Bridge

12 inch cable tray below bridge divided for HV and signal

LV and signal cables to Lower Rack in former MVD rack location

I beams to support HBD and later VTX. Also support plastic/aluminum cable trays to detectors

(Gas supply lines <not shown> run up south pole face to I-beams then to horizontally to detector connections)

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• Four (4) 3 inch Aluminum I-beams, 2 below and 2 above for mounting & structural support for utilities.

• 3 brackets from each detector hemisphere, 2 each to upper beam and 1 to lower beam with 3 point adjustment for alignment. Set y, z, roll pitch and yaw with hemisphere away from beampipe, then adjust x position radially inward.

• Connect gas supply and return lines • Attach arched cable management to beams and pole

face and back to existing MVD cable tray or up to Bridge cable tray.

• Attach LV, HV and signal cables

Installation

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Stainless Steel pipe routed to and from mixing house into AH to gas monitoring (cabinet under stairs), over labyrinth, down below tracks through sill to CM region and up CM south pole face to i-beams

Gas Pipe Routing