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High-Voltage Supply Requirements Review

High-Voltage Supply Requirements Review. September 16, 2003 Nobuyoshi Kitamura University of Wisconsin-Madison / SSEC. Requirements Update. Changes / clarification as a result of recent engineering work Remove “split ground” requirement Changes in response to the PDR (5/20/2003)

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High-Voltage Supply Requirements Review

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  1. High-Voltage Supply Requirements Review September 16, 2003 Nobuyoshi Kitamura University of Wisconsin-Madison / SSEC N. Kitamura

  2. Requirements Update • Changes / clarification as a result of recent engineering work Remove “split ground” requirement • Changes in response to the PDR (5/20/2003) PMT pulse-coupling transformer specifications change (Proposed) Require conformal coating on PMT Base Board (Proposed) • Changes as a result of baseline change (IsegEMCO) Single-board to two-board Fixed to scaled 1st dynode voltage Design / Specification Review • PMT HV Base Board (“passive base”) • HV Control Board • HV Generator N. Kitamura

  3. Requirements Update N. Kitamura

  4. PMT Modular High Voltage Power Supply Requirements Document (9000-0039-02*) PMT High Voltage Board Requirements Document (9000-0039*) PMT High Voltage Power Supply Requirements Document (9000-0039-01*) Documentation “Passive Base” *George Anderson has been maintaining these documents. N. Kitamura

  5. Change due to Engineering Evaluation Delete: 3.2.2.5.3 Split Power/Digital and Analog Grounds • Iseg has been unable to implement this requirement (The trial version has major functional problems) • Noise levels are acceptable w/o this requirement • The split-ground requirement does not apply to the “EMCO” approach N. Kitamura

  6. Change in response to PDR (5/20/03)—No.1 Action Item # PDR-4: Coax negative margin The RG178 coaxial cable used for the PMT signal output transformer operates beyond the manufacturers voltage rating. It is possible to construct a transformer using a bifilar winding using silicone-insulated wire. See a PowerPoint presentation: toroid_alternative_design2.pdf N. Kitamura

  7. Change in response to PDR (5/20/03)—No.2 Action Item # PDR-17: Conformal coating • One of the open items needed to be closed for procurement • Requirement was “hacked away” at Zeuthen meeting earlier this year • Efficient way to avoid trouble from dust, finger prints, etc. • May be compatible with board wash • Recommend keeping this requirement N. Kitamura

  8. Changes as a result of (IsegEMCO) Terminology change and document re-organization PMT Modular HV Power Supply (9000-9939-02) HV Control Board Digital Interface HV Generator PMT HV Base Board The Modular HV Power Supply consists of two boards (three possible component sources) 1st Dynode voltage scales with Cathode-Anode voltage (~40%) N. Kitamura

  9. Specifications Review N. Kitamura

  10. PMT HV Base Board • 150MOhm total resistance • Capacitor between each dynode interval • Toroidal transformer for output • EMCO 9731 has been evaluated with favorable results • Needs a minor correction • Needs layout improvement • Needs some circuit improvement BLEEDER1x.pdf N. Kitamura

  11. HV Control Board Digital Interface Analog Interface HV Generator DOM Main Board PMT HV Base Board GND HV Control Board • Implements the same interface as the Iseg board • Same ADC, DAC as the Iseg board • Carries the HV generator • No HV traces on control board N. Kitamura

  12. +5V HV Generator -5V PWR +5V ON/OFF MOSI DAC PROG CS0 0..4.095V ID MISO HV x 2 0..2050V CS1 MON ADC 0..4.095V GND 4.096V GND REF HV Control Board Schematic: HV_MODULE_B_sch.pdf EMCO 9730 LTC1257 DS2401 LTC1286 LT1461 N. Kitamura

  13. HV Generator Proposed spec changes: Change PROG range from 0..4095V to 0..2047V  Eliminates x 2 OP-AMP Change MON range from 0..4095V to 0..2047V  Eliminate 0..4096V REF Change output cable from RG178/U to something else  Meet cable voltage rating Eliminate “GAIN ADJUST” trim pot  No need for true 12-bit accuracy  Overall simplicity and increased reliability N. Kitamura

  14. Conclusion • PMT HV Base Board • Needs a few technical decisions to move on: • Toroidal transformer specification • Conformal coating • Needs to choose a supplier • HV Control Board • Satisfactory prototype design • To be supplied by UW-Madison • HV Generator • Minor specification changes to be made • In contact with one vendor N. Kitamura

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