Vacuum Vessel and HV Supply Purchases Update
Update on the status of purchasing vacuum vessel and HV supply equipment, with open questions to address before placing orders. Finalizing resistor values, feedthrough options, and CAD checks are among the next steps.
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Presentation Transcript
Vacuum vessel and HV supply purchases: Status Have quotes in hand for both (attached pdfs) Both under budgeted amount (budgeted versus quoted for all parts will go into Wiki) Would like to order ASAP There are, however, a few open questions to be addressed before placing orders
Open questions: HV supply Note: We have decided on 10 cm field cage approved by PNNL / DOE The supply will be 8kV Need updated resistor network diagram to check compatibility of our intended use case with vendor Need to finalize resistors values LBNL Hawaii R1 to R5 values can be multiply by 5, above 5 the resistors will be too big to fit on a small bread board, note the 300MOhm resistors should also be multiplied by 5 I = 102.564 (51.282) nA for HV in = 4 (2) kV, with resistor values x 5, I = 20.5128 (10.2564) nA for HV in = 4 (2) kV
Open questions: Vacuum vessel Need to decide how to structure order (build 2 vessels first, the six more after we inspect the first 2)? Need to finalize SHV feedthrough for field cage Will sit on side of vessel Point at He-3 tubes in Belle II dock space CAD study shows it fits Need select feedthrough mounting type + connector type KF-16 versus base plate Mini-HV (90 degree) versus SHV (does 90 degree exist?) Need to ensure explicit Belle II approval for using this space I m assuming vessel design will not be affected by grounding scheme and feedthrough plate design choices, which are not 100% finalized
Next steps Finalize resitors estimate, send resistive network to vendor (CAEN) tomorrow Look for final UHV feedthrouh, connector, and request Belle II approval (to who?) + final CAD checks (by Alex) tomorrow Order vessels / HV supply and as soon as we hear back from Belle 2 / CAEN Upon order, we get detailed vessel cad for review Once we OK CAD, construction begins
Also urgent / closely related Finalize feedthrough plate on front of TPC vessel Finalize grounding scheme
