Difference between revisions of "Pion Meeting January 29 2021 11AM ET"

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=Agenda=
 
=Agenda=
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# Lucite detector shielding from downstream and at inner radius (Elham)
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# Lucite detector shielding from downstream and at inner radius (Elham) [https://moller.jlab.org/cgi-bin/DocDB/private/ShowDocument?docid=687]
  
 
=Attendance=
 
=Attendance=
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Elham, Wouter, David, Jim
  
 
=Minutes=
 
=Minutes=
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* Lucite detector shielding from downstream and at inner radius
 +
** 3 geometries: "original" with lucite far downstream of Pb donut, "new" with thinner/shorter lucite just downstream of Pb donut, "shielded new" with additional shielding
 +
** "new" geometry avoids showermax secondaries into lucite in other sector
 +
** However, still only 10% of light is from Moller electron generator, while there are still 100 times more pions
 +
** Possible ideas are both low energy electrons and the optical geometry selecting for the backgrounds over forward going pions
 +
** "shielded new" removes low energy particles that are hitting the lucite when moving backwards
 +
** Q: What happens if we change the air to vacuum again? How much does scattering of air direct secondaries from the showermax back into the top of lucite detector?
 +
** Q: How many primary electrons still reach the lucite? Is there punchthrough?
 +
** Q: Can we replace the donut by a wall with a hole in simulation?
 +
** Q: Canonical thickness of downstream inner radial lead shielding would be 4". Can this be increased?
 +
** Q: Diffuse reflection on the lucite surfaces? Fermilab approach.

Latest revision as of 16:58, 29 January 2021

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Agenda

  1. Lucite detector shielding from downstream and at inner radius (Elham) [1]

Attendance

Elham, Wouter, David, Jim

Minutes

  • Lucite detector shielding from downstream and at inner radius
    • 3 geometries: "original" with lucite far downstream of Pb donut, "new" with thinner/shorter lucite just downstream of Pb donut, "shielded new" with additional shielding
    • "new" geometry avoids showermax secondaries into lucite in other sector
    • However, still only 10% of light is from Moller electron generator, while there are still 100 times more pions
    • Possible ideas are both low energy electrons and the optical geometry selecting for the backgrounds over forward going pions
    • "shielded new" removes low energy particles that are hitting the lucite when moving backwards
    • Q: What happens if we change the air to vacuum again? How much does scattering of air direct secondaries from the showermax back into the top of lucite detector?
    • Q: How many primary electrons still reach the lucite? Is there punchthrough?
    • Q: Can we replace the donut by a wall with a hole in simulation?
    • Q: Canonical thickness of downstream inner radial lead shielding would be 4". Can this be increased?
    • Q: Diffuse reflection on the lucite surfaces? Fermilab approach.
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