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PMT HV Base Board Functional Overview (1/2)

PMT HV Base Board. Digital Interface. Analog Interface. PMT Anode signal. High voltage. Digital control. Power. PMT. Digital Optical Module Main Board (DOMMB). PMT HV Base Board Functional Overview (1/2). PMT HV Base Board Functional Overview (2/2). Analog functions

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PMT HV Base Board Functional Overview (1/2)

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  1. PMT HV Base Board Digital Interface Analog Interface PMT Anode signal High voltage Digital control Power PMT Digital Optical Module Main Board (DOMMB) PMT HV Base BoardFunctional Overview (1/2) N. Kitamura SSEC / UW-Madison March 30 - April 1, 2003, Laguna Beach, CA

  2. PMT HV Base BoardFunctional Overview (2/2) • Analog functions • +/-5V input, 1000-2000V output • Transformer coupling for PMT pulses • Digital functions • Adjustment and monitor of the HV output in 12-bit (0.5V) resolution • Digital readout of unique board serial number N. Kitamura SSEC / UW-Madison March 30 - April 1, 2003, Laguna Beach, CA

  3. PMT HV Base BoardDual-Track Strategy • Two configurations with identical signal interface as seen by the DOM Main Board • “Single-board” configuration • All functionality on one-board, mounted on PMT • “Passive base” configuration • Resistive bleeder chain & analog interface on PMT • Separate daughter board, carrying the HV generator & digital interface N. Kitamura SSEC / UW-Madison March 30 - April 1, 2003, Laguna Beach, CA

  4. PMT HV Base BoardDual-Track Comparison • Single Board • Compact integration • The 1st dynode voltage is fixed, independent of gain adjustment • HV generator close proximity to PMT • Passive Base • Classical approach • All dynode voltages scale with total A-K voltage • Potential noise source is away from PMT pins N. Kitamura SSEC / UW-Madison March 30 - April 1, 2003, Laguna Beach, CA

  5. PMT HV Base BoardMechanical HV Generator Board for “passive base” configuration PMT HV Base Board LED Modules Flasher Board DOM Main Board Delay Board 3D CAD by Glen Gregerson, PSL N. Kitamura SSEC / UW-Madison March 30 - April 1, 2003, Laguna Beach, CA

  6. PMT HV Base BoardVendors, Players & Schedule • Vendor A (Germany) to deliver the PMT base in single board configuration On time • Vendor B (US) to deliver the HV generator for the passive base configuration April 28 • Vendor B to deliver the passive base April 28 • UW-Madison to develop the daughter board for the passive base configuration Completed • UW-Madison to assemble the daughter board All components received N. Kitamura SSEC / UW-Madison March 30 - April 1, 2003, Laguna Beach, CA

  7. PMT HV Base BoardSingle Board Configuration • All-In-One design • Digital interface • HV generator • Voltage divider • Toroidal transformer • PMT pulse cable & connector • Fixed first-dynode voltage (700V). The prototypes in April ’03 will have a potentiometer adjustment • Isolation amplifier for split ground (more later) N. Kitamura SSEC / UW-Madison March 30 - April 1, 2003, Laguna Beach, CA

  8. Ribbon connector (2mm-pitch) HV cable out (RG178/U) HV Generator (bottom side) ADC (12-bit) DAC (12-bit) Digital board ID PMT HV Base BoardHV Generator Board N. Kitamura SSEC / UW-Madison March 30 - April 1, 2003, Laguna Beach, CA

  9. PMT HV Base BoardPassive Base • Total R = 150MW • Hamamatsu “Special” Divider Ratio • Plenty of C N. Kitamura SSEC / UW-Madison March 30 - April 1, 2003, Laguna Beach, CA

  10. PMT HV Base BoardResolved issues • Updates since August 2002 In-Ice Devices Meeting at UW-Madison • First-dynode voltage adjustability • Fixed for “single board” configuration • Scale with total A-K voltage • Temperature • Operation: –40 ºC to +27 ºC • Storage: –55 ºC to +45 ºC • Vendor must report components meeting –40 ºC but not –55 ºC. N. Kitamura SSEC / UW-Madison March 30 - April 1, 2003, Laguna Beach, CA

  11. PMT HV Base BoardIssues • Split-ground requirement • Isolation AMP costs power and $ • Reduced regulator feedback gain • Toroidal transformer cable selection • RG178/U does not meet voltage requirement • Bulkier transformer expected after revision • “Quality Plan” • Must be defined and executed N. Kitamura SSEC / UW-Madison March 30 - April 1, 2003, Laguna Beach, CA

  12. PMT HV Base BoardDocumentation • PMT HV Base Board Engineering Requirements Document (ERD) • PMT HV Base Board ERD Supplement • PMT HV Base Board—DOM Main Board Interface Document These documents contain: • Engineering requirements • Preferred embodiments (specifications) • Justification based on science requirements N. Kitamura SSEC / UW-Madison March 30 - April 1, 2003, Laguna Beach, CA

  13. PMT HV Base BoardConclusion • The single board approach is on schedule. • The passive base approach is behind schedule. Vendor C is being pursued. • Quality Plan is a must. Human Peace Sign from McMurdo Station. Jan. 19, 2003. http://www.commondreams.org/headlines03/0119-02.htm N. Kitamura SSEC / UW-Madison March 30 - April 1, 2003, Laguna Beach, CA

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