Belle-II iTOP HVB Status SLIDE FOR INCLUSION IN GARY’S PRESENTATION Belle II General Meeting Gerard Visser Indiana University CEEM 11/13/2012.

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Belle-II iTOP HVB Status SLIDE FOR INCLUSION IN GARY’S PRESENTATION Belle II General Meeting Gerard Visser Indiana University CEEM 11/13/2012

Gary, also: “HV cable assy/test Run at -8000V without cleaning, Corona doping/coating” (I did apply some corona dope to other metal on the board to get this, but the cable connection was UNCLEANED and NO POTTING OR CORONA DOPE.) “Populate next 39x channels from tomorrow”  “Populating 47 more channels is in progress” (or something like that...) FYI current status: 1 board complete (see my slide), 5 more in assembly (I bet 1 more is done now, but I haven’t talked to the tech today); machine shop is working on the covers, ETA not completely defined but I expect friday or monday.

Completed HV board (shown without ground covers) spring pin ground contacts (2 each top & bottom) Belden # (RG-316 type) teflon insulation, FEP jacket I 2 C temperature sensor (future use) cable lays in slot in edge of PCB, braid soldered to slot (copper tape was needed here, next revision of board will have plated slot) surge-rated 220 Ω resistor in series with each cable ground (reconcile safety with EMI considerations) 5 screws (4 stainless steel, 1 Ultem 2300) clamp PCB between Gap-Pad sheets and aluminum ground cover plates Cable input through resistors provides protection and noise filtering Series resistor (1 MΩ) provides protection to photocathode PCB dimension 104 mm × 95.6 mm Next version can be slightly shorter (98 mm?) Total power 3.4 W 900V / MCP) Four channels on each side 4 layer PCB using blind vias, routing outputs to connectors using inner layers only TESTED −8 kV HIPOT OK Front board connectors same as before (2 mm pin header / socket style)