Majorana collaboration meeting, Seattle, Aug.7 - Aug. 9 Béla MajorovitsGERDA detector mounting 1 GERDA Detector Mounting The Detector Holders Detector.

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Presentation transcript:

Majorana collaboration meeting, Seattle, Aug.7 - Aug. 9 Béla MajorovitsGERDA detector mounting 1 GERDA Detector Mounting The Detector Holders Detector Handling and Transport Infrastructure Clean Room Lock System Functionality Pogo Pin Contacts OUTLINE: Béla Majorovits Max Planck Institut für Physik, München, Germany

Majorana collaboration meeting, Seattle, Aug.7 - Aug. 9 Béla MajorovitsGERDA detector mounting 2 GERDA Mission Statement Popularity of the name GERDA in norway Taken from

Majorana collaboration meeting, Seattle, Aug.7 - Aug. 9 Béla MajorovitsGERDA detector mounting 3 GERDA detector holder: phase I

Majorana collaboration meeting, Seattle, Aug.7 - Aug. 9 Béla MajorovitsGERDA detector mounting 4 GERDA detector holder: phase II Material balance: 31g Cu, 7g Teflon, 2.5 g Kapton cable Novel low mass contacting scheme with Cu on Kapton. Low mass holder is suitable for 20 kg load at LN temperature I. Abt. et al, NIM A 577(2007)574, nucl- ex/ Immersing of string into lN without substantial movement within reasonable time

Majorana collaboration meeting, Seattle, Aug.7 - Aug. 9 Béla MajorovitsGERDA detector mounting 5 GERDA detector handling Minimize risk of damage by touching: Design allows for touch free transport, mounting and dimounting into test stands and into experiment Easy to move: just like drinking coffee Easy to store: just like cooking your goulash

Majorana collaboration meeting, Seattle, Aug.7 - Aug. 9 Béla MajorovitsGERDA detector mounting 6 GERDA Detector Transport Maximum safety for necessary journeys envisioned  Use same system as for most precious thing transported in cars: System successfully tested: prototype-detector safely transported from Mainz to Munich

Majorana collaboration meeting, Seattle, Aug.7 - Aug. 9 Béla MajorovitsGERDA detector mounting 7 Detector array Liquid argon Cryostat (steel + Cu) Water tank (steel) Muon veto (Č) GERDA Lock systemClean-room  Load detectors from top of the tank through clean room area

Majorana collaboration meeting, Seattle, Aug.7 - Aug. 9 Béla MajorovitsGERDA detector mounting 8 GERDA: the clean room Class clean room Underneath flow boxes class 100 Detector storage Test stand Air shower Material lock Mounting station

Majorana collaboration meeting, Seattle, Aug.7 - Aug. 9 Béla MajorovitsGERDA detector mounting 9 Cable Arms Service Flanges Space for pumping stations Circular shutter body Magnetic transfer arms The Clean Room and the Lock Inner lock

Majorana collaboration meeting, Seattle, Aug.7 - Aug. 9 Béla MajorovitsGERDA detector mounting 10 The Lock Rectangular shutters Signal Feedthroughs as close to the cable arms as possible. Outer lock Magnetic transfer arms

Majorana collaboration meeting, Seattle, Aug.7 - Aug. 9 Béla MajorovitsGERDA detector mounting 11 Detector Integration: Rail system Magnetic transfer arm Wheel gear Cable car Rail toward outer lock

Majorana collaboration meeting, Seattle, Aug.7 - Aug. 9 Béla MajorovitsGERDA detector mounting 12 Loose pulley sliding on a guiding rail Cable winch Overhead pulley Strain relief HV and signal cables, Steel cables holding the detectors Ge-crystals Side view Total length between overhead pulley and final crystal position: ~7m Two steel cables to have a fixed angle position of crystal relative to vertical axis 33mm Detector Integration: Rail system

Majorana collaboration meeting, Seattle, Aug.7 - Aug. 9 Béla MajorovitsGERDA detector mounting 13 Detector Integration: String Pulley It is tricky to bring down strings without any torsion --> use torsion resistent guide chain (Kabelschlepp) made of stainless steel Electrical motor drives the winch

Majorana collaboration meeting, Seattle, Aug.7 - Aug. 9 Béla MajorovitsGERDA detector mounting 14 Towards overhead pulley Towards crystal Contacting Within the Lock Pogo pin contacts NiAu plated copper pad surface Laser welded connection to cables to outside world Kapton cable towards front end electronics

Majorana collaboration meeting, Seattle, Aug.7 - Aug. 9 Béla MajorovitsGERDA detector mounting 15 Conclusion Due to external requirements: very tricky mechanisms Technical solutions for all processes exist Technical realization well under way Only little and only screened materials used (stainless steel and Teflon) There will come a time when we can relax and the name GERDA will be popular again

Majorana collaboration meeting, Seattle, Aug.7 - Aug. 9 Béla MajorovitsGERDA detector mounting 16 Phase II storage infrastructure Pressure gauge Safety valve Flow controller to exhaust line Exhaust line Flushing line Towards Pumping line Detector storage system built at MPI Munich for our prototype detectors.