Timing correction for Germanium Detectors via Signal Rise-time - - PowerPoint PPT Presentation

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Timing correction for Germanium Detectors via Signal Rise-time - - PowerPoint PPT Presentation

Jun 03, 2023 38 likes •184 views

GSI Helmholtzzentrum fr Schwerionenforschung, Comenius University, Bratislava Timing correction for Germanium Detectors via Signal Rise-time Analysis Fakulta Dr. Tobias Habermann, Mat Balogh Dr. Jrgen Gerl Timing correction for

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SLIDE 1

Fakulta

GSI Helmholtzzentrum für Schwerionenforschung, Comenius University, Bratislava

Timing correction for Germanium Detectors via Signal Rise-time Analysis

  • Dr. Tobias Habermann,

Matúš Balogh

  • Dr. Jürgen Gerl
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SLIDE 2

Timing correction for Germanium Detectors via Signal Rise-time Analysis

Motivation

2

  • Technique to improve time resolution by using pulse rise time
  • Precise timing information can be used to suppress background radiation

104Sn experiment

courtesy of Giulia Guastalla g.guastalla@gsi.de

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SLIDE 3

Timing correction for Germanium Detectors via Signal Rise-time Analysis

3

Experimental setup

Coincidence measurement using

  • Ortec GEM 28185-P HPGe
  • LaBr fast scintillator

Radioactive sources

  • 60Co
  • 22Na

FADC with 10 ns sampling resolution TDC with 90 ps resolution

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SLIDE 4

Timing correction for Germanium Detectors via Signal Rise-time Analysis

4

Data acquisition

MBS Go4

Unpacker

Go4

Sorting

ROOT

file

ROOT

new file

Preprocessing by TTree::MakeClass

Analysis

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SLIDE 5

Timing correction for Germanium Detectors via Signal Rise-time Analysis

5

Preprocessing

  • Pulses only from photopeak events
  • Subtracting baseline, normalizing and aligning pulses
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SLIDE 6

Timing correction for Germanium Detectors via Signal Rise-time Analysis

6

Preprocessing

Rise time analysis – need to get rise times

  • not possible to obtain full rise time -> using partial rise times (Tx) instead

𝑈90

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SLIDE 7

Timing correction for Germanium Detectors via Signal Rise-time Analysis

Preprocessing

Calculating time walk – difference between timing signal from LaBr and HPGe 𝐺𝑋𝐼𝑁 = 13,8 𝑜𝑡 𝐺𝑣𝑚𝑚 𝑥𝑗𝑒𝑢ℎ 𝑝𝑔 167 𝑜𝑡

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SLIDE 8

Timing correction for Germanium Detectors via Signal Rise-time Analysis

Analysis

Confirmation of linear dependence between Twalk and the rise times 𝑈30 𝑤𝑡 𝑈𝑥𝑏𝑚𝑙 𝑈50 𝑤𝑡 𝑈𝑥𝑏𝑚𝑙

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SLIDE 9

Timing correction for Germanium Detectors via Signal Rise-time Analysis

Analysis

Dependence between 𝑈𝑥𝑏𝑚𝑙 and rise time (𝑈

𝑦) was fitted by ROOT::TLinearFitter

  • In case of fitting 𝑈𝑥𝑏𝑚𝑙 with single rise time:

𝑈𝑥𝑏𝑚𝑙 = 𝛽𝑈

𝑦 + 𝛾

  • In case of fitting 𝑈𝑥𝑏𝑚𝑙 with all rise times:

𝑈𝑥𝑏𝑚𝑙 = 𝛾 + 𝛽𝑗𝑈𝑗

𝑗=20,30,…90

Subsequentaly data set was shifted according to the one of the equation

  • In case of single rise time fit:

𝑈𝑥𝑏𝑚𝑙

′

= 𝑈𝑥𝑏𝑚𝑙 − 𝛽𝑈

𝑦 + 𝛾

  • In case of all rise time fit:

𝑈𝑥𝑏𝑚𝑙

′

= 𝑈𝑥𝑏𝑚𝑙 − 𝛾 + 𝛽𝑗𝑈𝑗

𝑗=20,30,…90

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SLIDE 10

Timing correction for Germanium Detectors via Signal Rise-time Analysis

Analysis

Gated 𝑈𝑥𝑏𝑚𝑙 𝑤𝑡 𝑈50 dependence fitted using at least 70% of remaining data:

  • 𝐺𝑋𝐼𝑁 = 12,6𝑜𝑡

(13,8𝑜𝑡)

  • 𝐺𝑣𝑚𝑚 𝑥𝑗𝑒𝑢ℎ 𝑝𝑔 138 𝑜𝑡

(167𝑜𝑡)

Single dependence

Original spectrum New spectrum

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SLIDE 11

Timing correction for Germanium Detectors via Signal Rise-time Analysis

Analysis

Multi dependence

Gated 𝑈𝑥𝑏𝑚𝑙 𝑤𝑡 𝑏𝑚𝑚 𝑈

𝑦 fitted using at least 70% of remaining data:

  • 𝐺𝑋𝐼𝑁 = 14,2𝑜𝑡

(13,8𝑜𝑡)

  • 𝐺𝑣𝑚𝑚 𝑥𝑗𝑒𝑢ℎ 𝑝𝑔 158 𝑜𝑡

(167𝑜𝑡) Original spectrum New spectrum

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SLIDE 12

Timing correction for Germanium Detectors via Signal Rise-time Analysis

Outline

  • Continue to explore possibilities of the Signal Rise time Analysis
  • Application of Pulse Shape Analysis for further improvements in time resolution
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SLIDE 13

Thank you for attention

GSI Helmholtzzentrum für Schwerionenforschung Comenius University, Bratislava Matúš Balogh

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SLIDE 14

Questions?