Bootstrap for the Flat-Panel PMT R&D Project Flat-Panel meeting, 24.02.2009 Stephan Eisenhardt University of Edinburgh o Attempt to compile & order questions.

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Presentation transcript:

Bootstrap for the Flat-Panel PMT R&D Project Flat-Panel meeting, Stephan Eisenhardt University of Edinburgh o Attempt to compile & order questions & tasks for FP-PMT R&D project – test programme – tool set – key questions – towards a system integration o Edi test setup for Flat-Panel PMT o Edi test setup for QE measurements Note: this is a working document, unfinished and evolving with time… … comments from the meeting were included

2 DUT – Device Under Test Flat-Panel meeting, Stephan Eisenhardt o Flatpanel PMT: R8400 (package H9500) –256 optical/electrical channels –52.0x52.0mm, square package –49.0x49.0mm active area, 0.2mm gaps –pixel size: 3.04x3.04mm (edge: 3.04x3.22mm, corner: 3.22x3.22mm) –active area fraction: 89% (78.3%) o includes: –HV connection (cable or pin) –HV distribution (bleeder chain) –256 ch. interface: 4x Samtec QTE F-D-A connector 4x Samtec STE shielded 50  signal cable i.e. direct plug-in to PCB or via cable o needs: –charge integrating read-out –single HV supply HV: pin or cable contacts

3 Flat-Panel meeting, FP-PMT Test Programme I Stephan Eisenhardt o core programme: èconclude from as many as possible FP-PMT devices, test at several sites –single photoelectron spectrum, separation from pedestal –S/N vs. gain(HV) ( ), i.e. posterior gain equalisation possible? –single photoelectron loss below threshold vs. gain(HV) –channel-to-channel gain variation in single FP-PMT –global gain variation between FP-PMTs –system common mode o needs: –common definition of gain, S/N, signal loss below threshold, … ècommon fit function to signal spectrum, to talk the same language… èproposal: use algorithm developed for MaPMT: LHCb –(inter-)calibration of used readouts: gain/charge, (electronic) system noise

4 FP-PMT Test Programme II Flat-Panel meeting, Stephan Eisenhardt o specialised measurements / tasks: –crosstalk to neighbouring pixels –disentangle crosstalk in FP-PMT, Samtec cable, adapter/FE electronics –behaviour on B-field (signal loss, gain loss, crosstalk) –signal gain margin for ageing and B-field loss (need for gain matching of tubes?) –signal (gain?) loss at edges and corners of FP-PMT –profile across pixel (inefficiency at centre?, shape of edge & corner?) –active area fraction (actual sensitive area, gaps between pixels) –QE, signal gain & signal efficiency for bialkali, SBA & UBA photocathode –QE variations across window surface –(QE for borosilicate & UV-glass window) –time profile of signals (any spill-over in subsequent electronics?) –stand-alone MC study of signal efficiency with increased pixel size wrt. HPD

5 Flat-Panel meeting, FP-PMT Test Tools Stephan Eisenhardt o for core programme: –common language: algorithm to describe signal shape/gain/loss  existing algorithm: used for MaPMT (current implementation in Fortran, port to C++ needed?) –controlled (pulsed), single photon light source (per pixel, per event)  existing scheme: low cost pulsed LED system used at PDTF (470nm, 10-15ns FWHM, no afterpulses) –charge injection for charge/gain calibration & cross-talk of readout/cables –automated(?) HV control o for special measurements: –focused light source & xy-stage –magnetic field –calibrated QE measurement –readout with channel-individual gain adaptation: (e.g. MAROC chip, or discrete)

6 Key Questions Flat-Panel meeting, Stephan Eisenhardt o Key questions to answer for FE electronics (all inter-linked): –dynamic range of signals put into FE chip (any clipping of large input signals?) –signal shaping in preamp: rise time, recovery time, any spill-over to next cycle (e.g. for large signals, depending on characteristics of FE-chip…) –resolution (bits) of channel-by-channel pre-amp gain adjustment (configurable) –digital vs. binary output signal? (analogue signal transmission is out, isn’t it?) if digital: number of ADC bits? consequences for links/bandwidth –need/desire online common mode correction? if online CM-correction where - in FPGA on FE board or at L1? which resolution needed? –zero suppression before transfer to L1? pro: saving in bandwidth contra: need to understand signal very well, otherwise source of bias (countermeasures?) –needed bandwidth and number of GBT links to L1? (any need to discuss anything other than optical, i.e. copper? e.g. due to cost?)

7 System Integration Flat-Panel meeting, Stephan Eisenhardt o System integration: –module size: e.g. 2x2 FP-PMT = 1024 channels, like for MaPMT, similar to HPD any reason for other grouping? –arrangement of modules to a plane to cover the current detector plane any changes needed/desired? –needed supplies and support: understand changes to HPD system evaluate mag. shielding needs and consequences on layout –evaluate possible re-usage of current infrastructure: e.g. magnetic shielding, photon funnel, quartz windows, MDMS system … –total power consumption and cooling needs –compile/build solution for physical layout of components o need to start thinking now… the 2015 time scale might change a lot…

8 Case for On-board FPGA Flat-Panel meeting, Stephan Eisenhardt o Zero Suppression (now back on the table…) –application after discrimination –… but on-board before transmission to L1 to save bandwidth –caveat: need to understand signals very well to not introduce bias o Cross-talk correction –needs access to all channels of a FP-PMT (i.e. across several FE-chips) –correction needs to be done before discrimination o Common Mode correction –same requirements as cross-talk correction –needed unless: final system is guaranteed to not have common mode FE-chips have common mode correction built in (not whole FP-PMT: would that be sufficient?)

9 Edi Flat-Panel Setup (default) Flat-Panel meeting, Stephan Eisenhardt o planned default Edi setup for Flat-Panel PMT tests: using commercial QDC – : fully automated, low crosstalk –  : 64 channels as a time, needs linear amplification, kHz o ordered: –FP-PMT –VME: CAEN V972 32xQDC (x2) –VME: CAEN V1495 IO –VME: CAEN V288 CAENET o to build: –64x video amp PCB (x2 + adapter for crossing) –(LED trigger box) –DAQ programme: adapt for new HW & tests FP-PMTVideo amp PCB x1 (x4) Samtec x4 SxC 50  coax (optional) 64x Q single ended Q single ended Qx100 GRIN lens x y focused pulsed (CW) light source defocused pulsed (CW) light source VME NI 8012 controller CEAN V972 32xQDC CAEN V288 CAENET CAEN V1495 IO CES RCB 8047 CORBO PC Labview RS232 or USB PCI NI 8012 dark box, DUT, amp PCB, GRIN on xy-stage power switch stepper driver x y CAEN N470 HV interlock enable trigger LED 470nm LED trigger box 4x 16ch

10 Edi Flat-Panel Setup (option) Flat-Panel meeting, Stephan Eisenhardt o optional Edi setup for Flat-Panel PMT tests: using 4x BoardBeetle1.2MA0 – : fully automated, 256 channels as a time, 40MHz –  : crosstalk and dynamic range issue, extra C o ordered: –FP-PMT o to build: –4x adapter Samtec-PGA (PCB?) –(LED trigger box) –DAQ programme: adapt for tests FP-PMTBoardBeetle 1.2MA0 x4 Samtec x4 SxC 50  coax (optional) 4x 64ch (of 128 ch) GRIN lens x y focused pulsed (CW) light source defocused pulsed (CW) light source Q single ended V 128x LVDS multiplex VME NI 8012 controller CAEN V288 CAENET CAEN V1495 IO CES RCB 8047 CORBO PC Labview RS232 or USB PCI NI 8012 dark box, DUT, amp PCB, GRIN on xy-stage power switch stepper driver x y CAEN N470 HV interlock enable trigger LED 470nm LED trigger box SEQSI MIDAS20 + FLIC 4x 64ch of (4x 128ch) adapter Samtec- PGA (extra C!)

11 Edi Flat-Panel Setup (w. B-field) Flat-Panel meeting, Stephan Eisenhardt o optional Edi setup for Flat-Panel PMT tests: using 4x BoardBeetle1.2MA0 (or QDCs) – : fully automated –  : 256 (64) channels as a time, crosstalk and dynamic range issue o units still to organise/borrow/buy: –new current source (may have access to borrowed source) o to build: –special dark box –current source interface FP-PMTBoardBeetle 1.2MA0 x4 Samtec x4 SxC 50  coax 4x 64ch (of 128 ch) defocused pulsed (CW) light source Q single ended V 128x LVDS multiplex VME NI 8012 controller CAEN V288 CAENET CAEN V1495 IO CES RCB 8047 CORBO PC Labview RS232 or USB PCI NI 8012 dark box, DUT, amp PCB, GRIN on xy-stage stepper driver CAEN N470 HV interlock enable trigger LED 470nm LED trigger box SEQSI MIDAS20 + FLIC 4x 64ch of (4x 128ch) adapter Samtec- PGA (extra C!) magnet 0-35mT (0-350Gauss) 12cm opening 30A source 0-10V or USB

12 new Edi QE setup Flat-Panel meeting, Stephan Eisenhardt o Edi setup for QE measurement: –fully automated –established measurement procedure o units still to order: –ND filter set –quartz lens –xy-stages & stepper driver –(NI 6036E to SC2042 interface) –(solenoid for PD) o to build: –(dark box) –new distr. box –mounts for xy-stage PD –new power switch –Labview program Xe lamp & ND filters monochromator, switch (& chopper) dark box, calib. Si-PD on  -arm, DUT on xy-stage DUT x y PD  distr. & switch box pA meter 6487 I in V out interlock GPIB quartz lens (optional) PCI GPIB PCI NI 6036E NI SC2042 PC Labview power switch RS232 or USB USB stepper driver x y

13 Conclusions? Flat-Panel meeting, Stephan Eisenhardt o … not really o we have a mountain of work before us o … and little time

14 Spare Slides Flat-Panel meeting, Stephan Eisenhardt