Heavy Gas Cherenkov

info

email list

HGC emaillist,"solid_hgc at jlab.org", registration and archive

Integration into SoLID

refer to SoLID_Engineering_Integration_and_CAD page Engineering Integration and CAD

prototyping and R&D

window and pressure vessel

• window materials
  • tedlar/mylar/tedlar from Madico
  • "We have used this type of material for spectrometer vacuum windows. It is made of high end sail cloth (actual sail material for boats). It is not the easiest material to work with but will most likely work for you. You may have to pretension the cloth depending on the manufacturer." from David Meekins of jlab target group, https://www.sailmakerssupply.com/product/racing-laminate-sailcloth-seconds/sailcloth, It's actually Kevlar/Mylar laminates
  • cheap kevlar, http://www.mcmaster.com/#kevlar/=14kwgqs , Its thickness 0.6mm is a bit bigger than 0.4mm used by BNL vacuum window, Not sure if it's because it's "cut resistant"
  • 2024 Al ~1mm thick

• Regina window tests
  • test 0: Test of 1.5mil Tedlar/3 mil PET/1.5 mil Tedlar material obtained from CLAS LTCC. with video showing slow motion of bursting and fast motion of the test
  • test 1: Full size test of 5 mil Mylar/12 mil Kevlar window material. Dec 5, 2016.
  • test 2: Full size test of 5 mil Mylar/12 mil Kevlar window with circumferential epoxy. Feb 16, 2017.
  • test 3: Small size test of double layer 5 mil Mylar/12 mil Kevlar window with epoxy coating. June 9, 2017.
  • test 4: Small size tests of five different configurations of 5 mil Mylar/12 mil Kevlar window with epoxy coating. Aug 16, 2017.
  • test 5: Tests of small Carbon windows in 2019.
  • test 6: Initial tests of full-size Carbon windows in 2019.
  • test 7: Final tests of Carbon and Aluminum windows in 2021.

• Regina prototype vessel leak tests
  • Sealing and leak tests of prototype vessel in 2021.

mirror

HGC mirror drawing and SBU half mirror Al support structure at p12 of https://solid.jlab.org/DocDB/0002/000254/003/solid_hgc_zwzhao_20200608.pdf

• test stand info
  • SHMS HGC mirror test stand info, ch5 of https://misportal.jlab.org/ul/publications/downloadFile.cfm?pub_id=12091
  • CLAS12 RICH mirror test stand info
    • https://clasweb.jlab.org/wiki/images/3/35/CMA_report.pdf, That refers to a mirror technology that was rejected (rohacell core, not stable enough) but explain part of the characterization we made.
    • additional information from the initial evaluation of the real mirrors: https://clasweb.jlab.org/wiki/images/4/4c/2016-05-20_SphericalMirrors.pdf, https://clasweb.jlab.org/wiki/images/2/2a/2016-07-01_SphericalMirrorsCMM.pdf, https://userweb.jlab.org/~tlemon/RICH/D0_Measurement_Results_2016-10-21.pdf
    • RICH mirror geometry was measured at jlab survey group, d0 and reflectivity at jlab detector support group. the new fiber optics reflectivity test-station: https://userweb.jlab.org/~tlemon/RICH/New%20Reflectivity%20Test%20Station%202022-04-22.pdf
      • old reflectivity test station is monochromator based and similar to the hallc setup, but his new fiber optics based setup is much more compact and easy to use.
      • new fiber optics reflectivity test station was optimized down to 350nm so far, but it can be upgraded to 200nm or even 180 nm with N2
      • more details at https://solid.jlab.org/files/cherenkov/RICH-mirror-tests-info/