The Muon Veto DAQ The Muon Veto DAQ Florian Ritter Kepler Center - - PowerPoint PPT Presentation

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The Muon Veto DAQ The Muon Veto DAQ Florian Ritter Kepler Center - - PowerPoint PPT Presentation

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The Muon Veto DAQ The Muon Veto DAQ Florian Ritter Kepler Center for Astro and Particle Physics Eberhard Karls Universitt Tbingen Outline Outline Muon Veto Facts Muon Veto in Phase I Muon Veto in Phase II Summary and

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The Muon Veto DAQ The Muon Veto DAQ

Florian Ritter Kepler Center for Astro and Particle Physics Eberhard Karls Universität Tübingen

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GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

Outline Outline

  • Muon Veto Facts
  • Muon Veto in Phase I
  • Muon Veto in Phase II
  • Summary and Outlook
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plastic scintillator Cherenkov-Veto photomultiplier „Pillbox“ VM 2000

GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

Muon Veto Facts Muon Veto Facts

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GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

Muon Veto Facts Muon Veto Facts

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Phase I will be used to improve μ trigger, figure

  • ut a hit pattern for muon classification ...

Simulations:

  • Muon background (no Veto): 1.02*10-3 counts/(keV kg y)
  • Trigger threshold on 1 p.e. for each PMT
  • Channels of one FADC are “OR”ed
  • 4 FADCs trigger within 30ns

Efficiency: 99.56 ± 0.42 %

accidental coincidences: ~ 60 μHz

GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

Muon Veto in Phase I Muon Veto in Phase I

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single Muon hitting only Water Tank, without Pillbox, 1 dot = 1 p.e.

TOP BOTTOM

Muon Veto in Phase I Muon Veto in Phase I

GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

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Muon Veto in Phase I Muon Veto in Phase I

GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

μ

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TOP BOTTOM

GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

Muon Veto in Phase I Muon Veto in Phase I

single Muon hitting only Water Tank, without Pillbox, 1 dot = 1 p.e.

example: upper ring inside water tank

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GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

single Muon hitting only Water Tank, without Pillbox, 1 dot = 1 p.e.

TOP BOTTOM

Muon Veto in Phase I Muon Veto in Phase I

Δt = 30ns

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GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

single Muon hitting only Water Tank, without Pillbox, 1 dot = 1 p.e.

TOP BOTTOM

Muon Veto in Phase I Muon Veto in Phase I

Δt = 30ns

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GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

single Muon hitting only Water Tank, without Pillbox, 1 dot = 1 p.e.

TOP BOTTOM regions with several p.e. within short time

Muon Veto in Phase I Muon Veto in Phase I

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Muon Veto in Phase I Muon Veto in Phase I

GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

Δt = 30ns

single Muon hitting Pillbox, 45 p.e., 1 dot = 1 p.e.

Only Pillbox!

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different pattern for different class of muons? Parameter space:

  • trigger value (2 p.e.

1 p.e.)

  • coincidence time window (30ns

40ns)

  • coincidence FADCs (3 FADCs 4 FADCs)

problems / improvements:

  • accidental coincidence may decrease drastically

(acc. coincidence mainly due to dark rate [i.e. 1p.e.] of PMTs)

  • Veto efficiency may decrease

but simulations show an efficiency > 98 %

Muon Veto in Phase I Muon Veto in Phase I

Tests needed!!

GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

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Muon Veto in Phase I Muon Veto in Phase I

GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

Germanium Na-22 “Dodi” - dodecahedron, 11 GERDA-PMTs, VM2000, liq. Scint. (DoubleChooz)

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Muon Veto in Phase I Muon Veto in Phase I

GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

Clock tics FADC channel Germanium PMT

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Muon Veto in Phase I Muon Veto in Phase I

GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

Clock tics FADC channel

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Muon Veto in Phase I Muon Veto in Phase I

GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

Clock tics FADC channel

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Muon Veto in Phase I Muon Veto in Phase I

GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

Clock tics FADC channel

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Muon Veto in Phase I Muon Veto in Phase I

suggested interface with Ge DAQ

Muon DAQ Ge DAQ μ trigger μ Data storage μ Analysis Ge Data storage Ge Data Analysis

GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

F l a s h e r monitoring PMT signals

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Muon Veto in Phase II Muon Veto in Phase II

To reach Phase II sensitivity, a good Muon rejection is necessary!

With techniques learned in Phase I possible μ background: 1*10-5 counts/(keV kg y)

  • r even better!

reminder: μ's: 1.02*10-3 counts/(keV kg y)

GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

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Summary / Outlook Summary / Outlook

  • good Muon rejection is needed.
  • during Ge DAQ calibration time, μ DAQ is experimenting

with data for learning.

  • with experience in Phase I, a good muon rejection is

possible in Phase II.

  • Phase II: combined DAQ for both Ge and muons.

GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

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Thank you for your attention Thank you for your attention

GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

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Muon Veto in Phase I Muon Veto in Phase I

suggested interface with Ge DAQ: a) Muon Veto sends trigger signal to Ge DAQ, so every muon will be recorded by Ge DAQ as “trigger from outside”, with timestamp within Ge DAQ. Offline analysis of Muon Veto data reveal

GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

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Muon Veto in Phase I Muon Veto in Phase I

suggested interface with Ge DAQ version A

Muon DAQ Ge DAQ μ trigger μ Data storage μ Analysis Muon Ge Data storage “Ge timestamp” accidental coincidence

 

Ge Data Analysis ?

GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

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Muon Veto in Phase I Muon Veto in Phase I

suggested interface with Ge DAQ version B

Muon DAQ Ge DAQ Ge trigger μ Data storage (“0 Event”) μ Analysis Muon in time window Ge Data storage “μ timestamp” accidental coincidence / other Muons

 

Ge Data Analysis

GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

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Muon Veto in Phase I Muon Veto in Phase I

Q: Do we need a Muon Veto?

aimed background: 1*10-2 counts/(keV kg year) Muons (no Veto): 1.02*10-3 counts/(keV kg year)

(Simulations by Markus Knapp)

A: Yes, but even without Veto, the aimed background should be reachable.

GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen

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GERDA Meeting, LNGS, March 1st-3rd 2010 - Florian Ritter, Universität Tübingen