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PD CONSORTIUM LIGHT CONCENTRATOR LAR PD-ACTIVE VETO Disclaimer: - PowerPoint PPT Presentation

Sep 07, 2023 •344 likes •423 views

PD CONSORTIUM LIGHT CONCENTRATOR LAR PD-ACTIVE VETO Disclaimer: all reported here is based on preliminary personal considerations, or informal discussions among some of us - photo-Collectors at FNAL - no in-depth thinking have ever been

  1. PD CONSORTIUM LIGHT CONCENTRATOR LAR PD-ACTIVE VETO Disclaimer: all reported here is based on preliminary personal considerations, or informal discussions among some of us - “photo-Collectors” at FNAL - no in-depth thinking have ever been put on these so far, no mechanical 3D modeling calculations, no MC simulations yet… by Indro C. < > FLAVIO CAVANNA - NOV. 27, 2017 1

  2. Winston cones are reflective surfaces used to concentrate light from a large area onto a smaller photo-sensitive area. A Light Concentrator Concept can be explored for implementation in APA-PD System ( concept from discussions w/ A. Para - Aug.’17) Front Back < > 2 FLAVIO CAVANNA - NOV. 27, 2017

  3. “Venetian Blinds” APA Frame A TWO-sided PD System Light Collector Bar r o t (Sensitive Front Side) a r with t n e c ) n e o c C a f r t h u g S i e L v i t c e fl e R ( Light Concentrator (tentative-conceptual design) Light Collector Bar (Blind Back Side) Light Concentrator (Reflective Surface) based on the assumption that APA frame can be modified, allowing for: • An increased (x 2) n. of slots for photo-collector bars • The installation of Vis-light-reflective surfaces inside the APA frame - before wire winding ✴ (we assume the Cathode surface covered with wls- coated Reflector foils - Light Enhancement/Booster System) < > 3 FLAVIO CAVANNA - NOV. 27, 2017

  4. Light Concentrator (Reflective Surface) Light Collector Bar (Sensitive Front Side) “Venetian Blinds” A TWO-sided PD System with Light Concentrator Light Collector Bar Light Concentrator (Blind Back Side) (Reflective Surface) • The Venetian Blinds - Light Concentrator System optically separate the LAr Volume facing the APA at the opposite sides (diaphragm) • Light Collector Bars are 1-side sensitive, with half of the bars looking at one LAr Volume and the other half to the opposite Volume < > 4 FLAVIO CAVANNA - NOV. 27, 2017

  5. The “Venetian Blinds” PD-system for the DUNE External APAs External APAs face the Cathode at one side, and the Cryostat’s long wall at the opposite side < > 5 FLAVIO CAVANNA - NOV. 27, 2017

  6. A large LAr Volume surrounds the LArTPC active volume < > 6 FLAVIO CAVANNA - NOV. 27, 2017

  7. The “Venetian Blinds” TWO-sided PD System promote the large outer LArTPC Active Volume dead -LAr Volume LAr PD-Active Veto Volume into a PD-Active LAr Volume, acting as VETO (background rejection) for rare underground signal searches [e.g. p-decay] < > 7 FLAVIO CAVANNA - NOV. 27, 2017

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