DarkSide Calib

Europe/Paris
Description

https://vidyoportal.cern.ch/join/twIAjm3qhk

    • 18:00 18:20
      Document calibration 20m
      Orateurs: Fabrice Hubaut (CPPM), Isabelle Wingerter-Seez (LAPP), Pascal PRALAVORIO (CPPM), Dr Pierre Barrillon (Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France)

      Discussion about the Calibration system of DarkSide-20k TPC

      2020 July 2nd

      Present: P. Barrillon, P. Di Stephano, F. Hubaut, A. Mc Donald, P. Pralavorio, P. Skensved, I. Wingerter-Seez

       

      Minutes:

      • Pierre made a short introduction to the calibration system reminding the baseline: 2 U-pipes of 3 cm internal diameter and 1/1.5 mm thickness exiting in 4 locations of the main cryostat top cap. At the bottom, the curvature has a 40 cm radius. Two types of box are foreseen: the glovebox (1/pipe) used for the insertion and fixation of the sources and the motorbox (2/pipe) used for the motion of the rope and source.

       

      • The motorbox from SNO+ was also presented as well as the modification foreseen to match DarkSide-20k geometry.

       

      • Most of the discussion was spent on the last slide where were listed the different points to clarify, discuss or confirm:

       

      1. Q.U will take care of the fabrication (workshop) of the internal pieces of the motor boxes as well as ordering the elements that can be bought to companies (motors, loadcell). The quantities produced and ordered will correspond to the final system (4 motor boxes). Workshop time estimated by Peter is ~45 hours / box. Work could start during summer, as soon as the material has been ordered.
      2. CPPM group agreed to take care of the motor boxes material expenses while Q.U would take care of the worker hourly cost. Peter will come with a more detailed estimation of the total cost. Current estimation is ~1500 Canadian $ per box.
      3. It seems easier that Q.U group orders all the material and elements for the 4 boxes and makes them shipped to Canada. Then CPPM will refund Q.U.
      4. Peter will check if CAD modification of the motor box could be taken care by Q.U. It looks logic.
      5. CPPM will take care of the motor box enclosures (gas tight) fabrication
      6. CPPM will take care of the motor box assembly. Peter said that simple tests before shipment could be carried out at Q.U.
      7. CPPM (or IN2P3 other lab) group will take care of the glove box design and fabrication.
      8. Tubes will be ordered by CPPM: 6 m in 2020 for the mock-up and 40 m for the final system in 2021. For this second order, a screening will be needed to assess the material purity. Bending will be in charge of CPPM.
      9. Motors and loadcells should be the same as SNO+ to limit the impact on the CAD modification and because they were proven suitable. Peter will check the loadcell model based on the maximum weight.
      10. Control command system: a similar system to the one developed for SNO+ should be used. Peter will check with colleague at Q.U. He thinks that the system could easily evolve to something involving Arduino that Pierre starts to be familiar with.
      11. Peter already sent a sample of SNO+ rope long enough for the mockup. More rope will need to be ordered for the final system. Peter sent a link after the meeting.

       

      Summary of short-term actions:

      • Peter will refine the cost estimation
      • Peter will check the compatibility of SNO+ motor, loadcell and control-command with respect to DS-20k system
      • Peter will check the CAD modification needed for the motor box
      • CPPM will finalize the pipes order for the mock-up
      • CPPM will continue looking for a solution to take care locally (in France) of the glove box CAD + interfaces (with pipes and motor box)
      • CPPM will check the feasibility of local (@CPPM) enclosures fabrication