Status of the Muon Veto DAQ Florian Ritter Eberhard Karls - - PowerPoint PPT Presentation

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Status of the Muon Veto DAQ Florian Ritter Eberhard Karls - - PowerPoint PPT Presentation

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Status of the Muon Veto DAQ Florian Ritter Eberhard Karls Universitt Tbingen PMT Water-Cherenkov HV - Supply Slow control Splitter Stretcher Germanium Muon Veto DAQ DAQ Storage GERDA Meeting, LNGS, November, 5 th -7 th 2007 -

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SLIDE 1

Status of the Muon Veto DAQ

Florian Ritter – Eberhard Karls Universität Tübingen

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SLIDE 2

PMT Water-Cherenkov

HV - Supply Splitter Stretcher Slow control Storage

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen

Muon Veto DAQ Germanium DAQ

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SLIDE 3 HV - Supply Splitter Stretcher Slow control Storage Muon Veto DAQ Germanium DAQ

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen

Space for additional Cards

CAEN SY 1527LC with 6 CAEN A1733P (12 ch. each up to 3kV, 3mA

  • resp. 4kV, 2mA)

High Voltage

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SLIDE 4 HV - Supply Splitter Stretcher Slow control Storage Muon Veto DAQ Germanium DAQ

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen

Splitter

PMT HV DAQ

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SLIDE 5 HV - Supply Splitter Stretcher Slow control Storage Muon Veto DAQ Germanium DAQ

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen

Splitter with passive stretcher

PMT HV DAQ

additional: RC filter

  • -> stretch signal

(here: τ = R*C ≈ 30ns)

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SLIDE 6 HV - Supply Splitter Stretcher Slow control Storage Muon Veto DAQ Germanium DAQ

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen

Stretcher - why?

Idea: Use mainly same electronics as for Ge-DAQ (Phase II) Problem: Width of typical single photon signals: ~ 20ns

  • -> 100MHz sampling rate of FADCs too slow for

sampling of PMT signals

  • -> stretch the signals (to ~ 100ns width)

for better signal processing

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SLIDE 7 HV - Supply Splitter Stretcher Slow control Storage Muon Veto DAQ Germanium DAQ

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen

  • ptical fibre

PMT signal + HV cable Stretcher Splitter PMT LED no / passive / active

Stretcher – Test setup

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SLIDE 8 HV - Supply Splitter Stretcher Slow control Storage Muon Veto DAQ Germanium DAQ

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen

active stretcher

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SLIDE 9 HV - Supply Splitter Stretcher Slow control Storage Muon Veto DAQ Germanium DAQ

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen

without stretcher

average pulses (Sum over 1000 pulses)

  • direct signal:

rise time: ~ 10ns (due to sampling)

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SLIDE 10 HV - Supply Splitter Stretcher Slow control Storage Muon Veto DAQ Germanium DAQ

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen

with passive stretcher

average pulses (Sum over 1000 pulses)

  • direct signal:

rise time: ~ 10ns (due to sampling)

  • passive signal:

rise time: ~ 30ns but: less ampl.

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SLIDE 11 HV - Supply Splitter Stretcher Slow control Storage Muon Veto DAQ Germanium DAQ

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen

with active stretcher

average pulses (Sum over 1000 pulses)

  • direct signal:

rise time: ~ 10ns (due to sampling)

  • passive signal:

rise time: ~ 30ns but: less ampl.

  • active signal:

rise time: ~ 40ns

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SLIDE 12 HV - Supply Splitter Stretcher Slow control Storage Muon Veto DAQ Germanium DAQ

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen

passive stretched signal loses amplitude

→ amplify signal afterwards / adjust FADCs

active stretcher exists already

→ use splitter plus active stretcher

Stretcher

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SLIDE 13 HV - Supply Splitter Stretcher Slow control Storage Muon Veto DAQ Germanium DAQ

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen

DAQ Setup 1

up to 7 Discriminators (Leading Edge Disc.) plus one (or more) trigger generator (tbd)

  • -> cost intensive,

triggering on PMTs

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SLIDE 14 HV - Supply Splitter Stretcher Slow control Storage Muon Veto DAQ Germanium DAQ

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen

DAQ Setup 2

  • nly one trigger

generator (XILINX), triggering on „Trigger

  • ut“ of the FADCs
  • -> low cost,

triggering on FADC

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SLIDE 15 HV - Supply Splitter Stretcher Slow control Storage Muon Veto DAQ Germanium DAQ

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen

DAQ Setup 3

several (conventional) trigger generators, triggering on „Trigger

  • ut“ of the FADCs
  • -> intermediate cost,

triggering on FADCs

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SLIDE 16 HV - Supply Splitter Stretcher Slow control Storage Muon Veto DAQ Germanium DAQ

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen

DAQ

Estimation of random rates (Setup 3)

  • Assumed dark count rate for a PMT:

rPM = 5kHz

  • FADC has triggered, when at least one

channel exceeds the threshold

  • Dark count rate for one FADC with 8 PMTs:

rFADC = 8*5kHz = 40kHz

  • Time window τ = 10 ... 50ns
  • random coincidence rate (2FADCs) rrand,2 = rFADC * rFADC * τ
  • 3FADCs: rrand,3 = rrand,2 * rFADC * τ = (rFADC * rFADC * τ) * rFADC * τ
  • More FADCs: ...
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SLIDE 17 HV - Supply Splitter Stretcher Slow control Storage Muon Veto DAQ Germanium DAQ

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen

DAQ

Time Window coincidence random rate (Hz) 10 ns 3 FADC 1,408 30 ns 4 FADC 0,034 30 ns 3 FADC 12,670 50 ns 4 FADC 0,158 50 ns 3 FADC 35,200

  • Monte Carlos:

efficiency > 98 % possible (-> Talk by M. Knapp)

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SLIDE 18 HV - Supply Splitter Stretcher Slow control Storage Muon Veto DAQ Germanium DAQ

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen

DAQ

Software:

  • FADC readout: done

(ca. 10 readout cycles (20MB) per second possible)

  • Leading Edge Disc. handling: done

(Test at a small setup with two PMTs: sucessful)

  • combination of both and GUI: not yet completed
  • Control of Flasher (LED + optical fibre) for stability tests: tbd
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SLIDE 19
  • Electronics: delivered (as far as decided)

FADCs have to be ordered

  • Software: single parts existing

Mainframe in progress

  • Test of plastic panels in Heidelberg with DAQ
  • Connection to Ge-DAQ: to be done

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen

Status Muon Veto DAQ

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SLIDE 20

Thank you!

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen

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SLIDE 21

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen

DAQ

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SLIDE 22

Base

GERDA Meeting, LNGS, November, 5th-7th 2007 - Florian Ritter, University of Tübingen