Produzione dei Primi Photo Detector Module di Darkside a Pisa

Produzione dei Primi Photo Detector Module di Darkside a Pisa

Produzione dei Primi Photo Detector Module di Darkside a Pisa

Produzione dei Primi Photo Detector Module di Darkside a Pisa Eugenio Paoloni per il gruppo Darkside Pisa

Produzione dei Primi Photo Detector Module di Darkside a Pisa

E. Paoloni, INF N & Università di Pisa Ottobre 2017, Pisa Talk Outline 2 Darkside 20K . What we have to assemble. What we have to test. How much space we do need and when.

E. Paoloni, INF N & Università di Pisa Ottobre 2017, Pisa Darkside 20K (K Stands For Metric Ton) 3 19 Feb 2016 DS-20k (C. J. New U.S. and international collaborators so

E. Paoloni, INF N & Università di Pisa Pisa, July 2017 Darkside 20 Ton Approved by the CSN2 and endorsed with 5 M€ 940k€ assigned in 2018.

Requires complete financial coverage (NSF, etc.) In review by the CTS. New collaboration agreement signed on June 15, 2017, with Canada Institutions to provide additional financial support: Canadian groups (Carleton, TRIUMF, Laurentian, Alberta, Queen’s and SNOLAB) [...]with the intention of submitting a capital funding request on the order of at least 15-20M$ CAD in support of DarkSide-20k and the global argon program resulting from this collaboration. We are moving towards a global argon dark matter collaboration (September 8, 2017) 4

E. Paoloni, INF N & Università di Pisa Pisa, July 2017 Darkside 20 Ton Approved by the CSN2 and endorsed with 5 M€ 940k€ assigned in 2018. Requires complete financial coverage (NSF, etc.) In review by the CTS. New collaboration agreement signed on June 15, 2017, with Canada Institutions to provide additional financial support: Canadian groups (Carleton, TRIUMF, Laurentian, Alberta, Queen’s and SNOLAB) [...]with the intention of submitting a capital funding request on the order of at least 15-20M$ CAD in support of DarkSide-20k and the global argon program resulting from this collaboration.

We are moving towards a global argon dark matter collaboration (September 8, 2017) 5 NSF GRANT PHY-1622415 APPROVED

E. Paoloni, INF N & Università di Pisa Ottobre 2017, Pisa The Detector Module The Detector Module will be conceptually equivalent to the Photo Multiplier A device able to detect and count photons with: higher efficiency: better filling factor with respect to PM lower backgrounds: higher radio-purity with respect to PM Not available on the market: we have to design and built it It will be the key ingredient of the future multi ton noble gas detectors for Dark Matter and neutrinos. 6

E. Paoloni, INF N & Università di Pisa Ottobre 2017, Pisa Detector Module Components Tile 49.5 x 49.5 mm2 : 24 SiPMs on sapphire substrate Front-end Electronics: 4 Transimpedance Amplifiers, sum and analogical differential output driver Plastic cage to hold the Detector Modules components in place 7

E. Paoloni, INF N & Università di Pisa Ottobre 2017, Pisa Why In The Clean Room? We have to maintain the contamination from radioactive materials at a minimum (dust, finger prints, etc.) The SiPMs on the tile will have the whole surface and the wire bonds exposed: the clean room is the natural place for the assembly of the PDM. 8

E. Paoloni, INF N & Università di Pisa L ’Aquila, GSSI Feb 2017 Production Work-Flow Quality Control is the main assurance against Murphy’s Law Quality Control ( QC ) after any major/dangerous procedure.

10 SiPM Tile Front End QC QC DM QC Produced by SomeoneElse Shipment Reception Construction Delivery

E. Paoloni, INF N & Università di Pisa L ’Aquila, GSSI Feb 2017 Pre Production Work Flow Quality Control is the main assurance against Murphy’s Law Quality Control ( QC ) after any major/dangerous procedure. 11 SiPM Tile Front End QC QC DM QC Princeton GranSassoLab. Shipment ReceptionPisa ConstructionPisa Delivery

E. Paoloni, INF N & Università di Pisa Ottobre 2017, Pisa Current Status SiPM from FBK: production started in August Tile substrate layout: almost ready (Bologna) Front End Board circuit topology, substrate layout: almost ready (LNGS) Plastic cage design, assembly tools and procedures: almost ready (Pisa) Test stand at room temperature (Pisa) almost ready 12

E. Paoloni, INF N & Università di Pisa Ottobre 2017, Pisa The Big Picture By the end of 2017: production of the first PDM prototype with the almost final dimensions, SiPMs and materials. By the end of 2018: production and qualification at room temperature of 300 PDM for the Darkside 1ton prototype. Technology transfer to Nuova Officina Assergi of the know how needed to produce and test the whole batch of PDM for Darkside 20K (order of 8000). 2018 - 2020: setup a test stand at cryogenic temperature for the next generation of PDMs.

E. Paoloni, INF N & Università di Pisa Ottobre 2017, Pisa Required Space In 2018 Electric Test Stand: 1 Rack: foot print 1m2, power plug O (1 kW) low voltage power supply, high voltage SMU, switching matrix, signal generator Workbench: foot print 3m x 1m, power plug O( 1kW) Laser stimulus, oscilloscope, PC Assembly space Black box: foot print 1m x 1m 5 Closets to store the tools, the incoming parts and the complete parts 14

E. Paoloni, INF N & Università di Pisa Ottobre 2017, Pisa Required Services In 2018 Micro bonding: rework of bad/broken wire bonds among the SiPM and the Tile. Mechanical characterization of the incoming components, of the assembly tools and of the final product. 15

E. Paoloni, INF N & Università di Pisa Ottobre 2017, Pisa Required Space In 2019-2020 We would like to extend the test stand capabilities to test the PDM at cryogenic temperature in vacuum, test the PDM immersed in purified liquid Argon/Xenon. This off course will require to bring up a critical mass on a Cryogenic facility in the clean room or in the near by.

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