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Progress of TG-1 activities (refurbishment of Phase-I detectors)

Progress of TG-1 activities (refurbishment of Phase-I detectors). Stefan Sch ö nert on behalf of TG 1 GERDA general meeting Tuebingen, Nov. 9-11, 2005. Outline. Detector laboratory at LNGS (LArGe) Transportation of IGEX detectors to GS Refurbishment detector support and contacts

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Progress of TG-1 activities (refurbishment of Phase-I detectors)

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  1. Progress of TG-1 activities(refurbishment of Phase-I detectors) Stefan Schönert on behalf of TG 1 GERDA general meeting Tuebingen, Nov. 9-11, 2005

  2. Outline • Detector laboratory at LNGS (LArGe) • Transportation of IGEX detectors to GS • Refurbishment • detector support and contacts • mechanical/thermal prototype • non-enriched prototype diode • recovery strategy • overall refurbishment and testing strategy • Summary / outlook

  3. Underground detector lab (LArGe) ‘Rn-free’ clean bench (detector mounting) ‘Rn-free’ detector test stand: electro-polished dewar & HP-LN refill system (not shown)

  4. Ongoing work to get underground detector lab operational • Installation of ‘Rn-free’ clean bench and detector test stand • Start-up of chemistry equipment (DI-water, acids, alcohol): purification of Cu & PTFE, methanol wash of Ge-diode • transformation into clean room • Completion: early December

  5. Transportation of IGEX detectors IGEX super-boxes (3x) • Transport box sent by Frank Avignone to Canfranc • Nov. 13: Igor, Andrey & Peter  Canfranc • Nov. 15/16: preparation and packing of detectors with help of Zaragoza group • Nov. 17: sprinter (accompanied by Andrey) Canfranc  GS; above ground < 24h • Testing of detectors at GS by Andrey & Igor and Oleg Thanks to Julio Morales and Frank Avignone for support!

  6. Detector refurbishment:support, contacts & array geometry • Design review of contacts • and support with Canberra, Olen • Prototypes • Cooperation during refurbishment (if needed) worked out • All materials procured • PTFE and Cu screened Single detector Phase-I detector array

  7. Detector refurbishment:mechanical and thermal prototype Silicon spring for inner contact Signal feed through Result of LN cooling test: replacement of one PTFE part by Si

  8. Detector refurbishment:destruction test: verification of safety factor Finite element calc. Destructive test • Deformation as expected • Safety factor 3 experimentally confirmed • Material strength increases at LN temperature

  9. Cleaning of copper parts • Electro polished (same procedure as GeMPI detector parts) • Chemically etched 1% H2SO4 + 3% H2O2 5 min 1% citric acid 5 min Possible sequence (to be finalized): 1) electro-polishing 2) chemical etching (underground) Surface of copper after machining (electro-erosion) 100 m

  10. non-enriched prototype diode • Goal: test contacts & support of system • Prototype for enriched detector if refurbished at Canberra (Chinese hat) • 2 kg diodeready for mounting and testing at Olen • Detector support and contacts in workshop • Mounting and testing in November/December

  11. Transport and storage container • Clean storage of diodes after dismounting and after testing • Electro-polished stainless steal container • Selected Butyl O-rings (low Rn emanation)

  12. Recovery strategy Possible failure modes and strategies for recovery worked out with Canberra, Olen In synthesis: • Dismounting and re-contacting underground at GS w/o modification of diode • In case of failure (e.g. damage of Ge-oxide passivation layer, boron implantation) refurbishment at Canberra (Olen) with underground storage in Hades. • Maximize probability to get working diode • Minimize exposure time (~ 1 week) at the prize of moderate material loss (~ 100 g) Change of Ortec type contacts to Canberra type with groove Canberra type of passivation

  13. Underground refurbishment Underground refurbishment Underground refurbishment Test in LN stand no Test in LN stand no Test in LN stand no Refurbish. at Olen Refurbish. at Olen Refurbish. at Olen yes yes yes Underground storage Underground storage Underground storage Bgd. testing In LArGe Bgd. testing In LArGe physics? no yes Operation Big tank (physics run) Operation Big tank (physics run) Operation Big tank (physics run) GERDA: on time fast delayed Refurbishment and testing strategy

  14. Summary / Outlook • Nov: transportation of IGEX detectors to GS • Nov: startup of underground detector laboratory (LArGe barrack) • Nov: test non-enriched prototype in LN at Canberra Olen • Dec: dismount 1st enriched diode (verify dimensions) – to be confirmed with Russian partners • Production of low-background support • Jan: start-up of LN setup at LNGS and operation of prototype • Subsequent: test of enriched diode in LN at GS

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