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AGATA Triple Cluster Detectors: Test Results and Status Update

This publication provides an overview of the AGATA triple cluster detectors, including acceptance test results, crosstalk analysis, and status updates. The text language is English.

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AGATA Triple Cluster Detectors: Test Results and Status Update

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  1. AGATA Week July 2008 CAT of AGATA detectors & The AGATA triple cluster detector University of Cologne Andreas Wiens B. Birkenbach, B. Bruyneel, J. Eberth, H. Hess, D. Lersch, G. Pascovici, P. Reiter - IKP Cologne H.-G. Thomas - CTT

  2. Overview • Acceptance test results • Status of the triple cluster detectors • Crosstalk in triple cluster detector • Summary

  3. Experimental setup & specifications Core at 1.3MeV: ≤ 2.35keV at 122keV: ≤ 1.35keV Segments at 1.3MeV: ≤ 2.30keV, mean ≤ 2.10keV at 60keV: ≤ 1.30keV, mean ≤ 1.20keV Crosstalk ≤1‰

  4. Test results A002 & A003 after gluing core contact A002 detector accepted A003 detector accepted

  5. Test results C004 detector accepted

  6. Test results A004 back seg. F5 FWHM: 2.66 keV front seg. A1 Very good performance at low energies low impurity concentration: crystal properties? trapping? detector rejected FWHM: 2.83 keV

  7. Test results B001 C3 leakage current damage at the contact or the implantation layer of A3 and C3 ? detector rejected 2.06 keV @ 59.5 keV

  8. Test results B004 First delivery: Dec 08 B004 – missing segment F6 after first delivery Second delivery: Jun 08 Core @ 59.5/122 keV FWHM: 1.5/1.6 keV @ 1.3 MeV FWHM: 2.7 keV High noise level at segment F4 (100 mV after Amp, without HV) Segments of sector F grounded: Core @ 1.3 MeV FWHM: 2.72 keV FWHM: 1.74 keV @ 122 keV Core 5000 V

  9. C001 in new TU Munich cryostat delivered to Liverpool for scanning Mean FWHM @ 60 keV: May 06: 1147 +/- 63 eV Jan 08: 1083 +/- 61 eV Mean FWHM @ 1.3 MeV: May 06: 2.13 +/- 0.1 keV Jan 08: 2.1 +/- 0.1 keV

  10. Summary acceptance tests

  11. Asymmetric AGATA Triple Cryostat Mechanical precision of the end caps bending under vacuum within tolerances • Exact positioning of the detectors inside the triple endcap Spacing 0.5 mm LN2 consumption Thermal properties HV box fits

  12. A001 – FWHM [keV] B002 – FWHM [keV] C002 – FWHM [keV] Tripel Cluster 1 Energies: Single vs Triple cryostat Resolution 60keV line Resolution 1.33MeV line Excellent energy resolution in new triple cluster Mean values segments @ 60 keV : A001 : 1011 +/- 53 eV B002 : 1039 +/- 70 eV C002 : 965 +/- 63 eV especially at low energies (electronic noise): - glued detector  less microphonics - HEKO  AGATA preamp - electronic assembly (grounding, cabling)

  13. Cross talk : intro Segment labeling: Sectors: A...F Rings: 1...6 Core to seg Xtalk = understood! A2..A6 B1 F1 X

  14. Smallest capacities in ring 2 D2 C2 F2 A2 E2 B2

  15. Smallest capacities in ring 2 B2 C2 F2 E2 D2 A2

  16. No cross talk between detectors in Triple Cryostat A001 C002 B002 A001 Sector A Sector F Sector A Sector F Core B Core C Sector A Sector F B002 Core A Core C C002 Core A Core B

  17. preliminary Tripel Cluster 2 Energies: Single vs Triple cryostat Resolution 60keV line Mean values segmens @ 60 keV : A001 : 1053 +/- 65 eV B002 : 995 +/- 73 eV C002 : 1149 +/- 105 eV

  18. AGATA Triple Clusters: Summary and outlook AGATA Triple Cluster Detectors operational: • first triple: • cryostat, mechanics, vacuum o.k. • seg-preamps, core preamp & pulser o.k. • energy resolution o.k. • no cross talk between detectors • second triple: commissioning phase - Outlook: Demonstrator at Legnaro: • - transport to Legnaro of ATC1 • in July 2008 • - assembly of third triple • constrained by available detectors ATC1 ATC2 ATC3

  19. Core pulser result: measurement of segment capacities in 1. triple

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