Difference between revisions of "JEF meeting, December 13, 2017"

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(Minutes)
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Attendees:  J. Crafts, L. Gan, S. Glamazdin, Z. Papandreou, S. Somov, S. Taylor,  
 
Attendees:  J. Crafts, L. Gan, S. Glamazdin, Z. Papandreou, S. Somov, S. Taylor,  
 
* S. Glamazdin studied 2 designs for shielding the PMTs in the insert using TOSCA:
 
* S. Glamazdin studied 2 designs for shielding the PMTs in the insert using TOSCA:
** Design 1:  individual tubes of 1010 steel shielding+1 layer of mu-metal for each PMT
+
** A longitudinal field of 60 Oersted was assumed
*** Reduction down to ~0.5 Gauss with a rapid rise toward the face of the steel in z is possible
+
** Design 1:  individual pipes of 1010 steel + 1 layer of mu-metal (360 microns) for each PMT
 +
*** Reduction down to ~<0.5 Gauss is possible but with a rapid rise toward the face of the steel in z
 +
*** Studies suggest need for a ~3cm long light guide
 +
** Design 2:  steel box with 4 mm thick walls housing entire insert
 +
*** Shielding improved when an additional 1 cm thick plate was placed at the back of the insert
 +
*** Shielding also improved when the tube for the beam hole was included
 +
*** Looks possible to reduce field down to the level where mu-metal should be sufficient to further reduce the field down to where the PMTs will see low enough field.
 +
*** Sasha will study what happens if the wall thickness of the box is reduced and if the hole for the beam is reduced.
 +
*S. Somov reported that an assembly of iron tubes will be assembled and studied with field in Hall D.
 +
* Zisis reported on less expensive SiPM options from SensL

Revision as of 17:02, 13 December 2017

Meeting time and location= 10:00 am EST (JLab time) CC-B101

Connection instructions

We are using BlueJeans Video/Audio conferencing. Our meeting ID number is 370588741. Click "Expand" for more details.

  • Make sure you have created a BlueJeans account via your JLab CUE account using this link:
  • If connecting via Web Browser: click this link (no passcode is needed):
  • If connecting via Phone: Dial one of the following numbers and then enter the meeting ID above and hit "#" or "##"
  • If connecting via Polycom unit:
    • Dial 199.48.152.152 or bjn.vc
    • Enter meeting ID above

Agenda

  • FCAL II budget

[1]

  • Magnetic shielding options (S. Glamazdin)

File:FCal shield.pdf

Minutes

Attendees: J. Crafts, L. Gan, S. Glamazdin, Z. Papandreou, S. Somov, S. Taylor,

  • S. Glamazdin studied 2 designs for shielding the PMTs in the insert using TOSCA:
    • A longitudinal field of 60 Oersted was assumed
    • Design 1: individual pipes of 1010 steel + 1 layer of mu-metal (360 microns) for each PMT
      • Reduction down to ~<0.5 Gauss is possible but with a rapid rise toward the face of the steel in z
      • Studies suggest need for a ~3cm long light guide
    • Design 2: steel box with 4 mm thick walls housing entire insert
      • Shielding improved when an additional 1 cm thick plate was placed at the back of the insert
      • Shielding also improved when the tube for the beam hole was included
      • Looks possible to reduce field down to the level where mu-metal should be sufficient to further reduce the field down to where the PMTs will see low enough field.
      • Sasha will study what happens if the wall thickness of the box is reduced and if the hole for the beam is reduced.
  • S. Somov reported that an assembly of iron tubes will be assembled and studied with field in Hall D.
  • Zisis reported on less expensive SiPM options from SensL