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    • 2:30 PM 2:50 PM
      Discussion 20m
      Speakers: Anastasiya Magazinik (Tampere University of Technology (FI)), Connor Miraval, Filippo Resnati (CERN), Jamie Boyd (CERN), Jean-Pierre Corso (CERN), Johan Bremer (CERN), Larry Bartoszek (University of Colorado Boulder (US)), Milind Vaman Diwan (Brookhaven National Laboratory (US)), Steve Trabocchi (Brookhaven National Laboratory), Steven Linden, Yichen Li

      Some discussion and homework 


      Connor will make sure all drawings from Larry and Steven Trabocchi have been converyed to Anastasiya  


      0)   Get information from Jetseals - Larry 

      Connor will contact Larry and Jetseals to understand what is needed to make further progress. 

      "I believe we can make a seal to fit a cavity close to what is drawn up. I do have a concern with the leak rate.  Everything leaks, the challenge is getting it small enough that it is manageable.  There is a lot of seal line for a small flaw to create a leak just large enough to create an issue.  We will have to check for to see if we can find a tin plating tank large enough. "

      Steve Hudlet, PE,  Engineering,  JETSEAL, Inc.


      1)   Conceptual design and options for electronics -- Steven is arraning a meeting with Sergio, Aleksey and others. 

      Prafull Purohit is spending some time understanding QPIX design. The power cost of QPIX is very low ~ few microwatts.  

      A document has been written to summarize where we are.  

      A design for the anode is needed with some tentative calculations of the heat load and performance.  


      2) Cabling options to get cables across to the feedthroughs.   --  Everyone ?

      The one unique aspect to FLARE TPC design is that the cables have to cross over TPC modules.  This means the grounding planes have to be considered 

      to make sure there is no field in the place where cables must go. 

      We could consider all optical readout, but we must then also consider optical power.    Power and readout must be done over fiber.  

      A new paper from DUNE is circulating about this development.  We should use it.  

      "Characterization and Novel Application of Power Over Fiber for Electronics in a Harsh Environment".
      The draft appears as DUNE-doc-30532 (link).


      3) Concepts for light readout.  --  Jianming ? Trigger ? Time tagging for LHC bunch. 

      New SIPMs are VUV sensitive down to 120 nm with 10% efficiency  

      BNL has ordered 18 units at $250 each.    We need to get these tested in Yichen's LAR chamber.  

      4) Electrical field calculations in the gap  -- Yichen using comsol. 

      Comsol -- can it use stp files ? This module apparently costs $8000 per year.  

      5) electrical field calculation in special positions near the cathode  -- Yichen using comsol

      Yichen will communicate with Jamie Boyd about using Comsol at CERN.  And what is needed in terms of getting access as well as putting in the 

      correct design data.  


      6) Some simulations studies to understand the fiducial losses due to gaps.  --  Matteo/ Wenjie 

      Pixel simulation  ? -- full simulation is not ready yet, but an effective simulation could be done with just different binning. 

      --- Put some deadlines and get the simulation note finished. 

      --- Get comments on simulation note by May 15. 

      We need to work on reading this simulation paper.  

      7)  Settle on a very small prototype /  using BNL 260 liter system  ?

      ---  Keep it < 10 cm drift.   16 channels of pixels,  and 8 channels of SiPMs. 

      ---  Readout out of the liquid. 

      ---  Aleksey ?

      Aleksey, Connor and Yichen will work together to make a drawing or idea for a small prototype 



      For the CERN FPF civil construction and ingtegration  document we can list the following people as technical contributors to the document from FLARE.  

      Steven Linden,  Connor Miraval,  Larry Bartoszek, Steve Trabocchi