June 7, 2018

From Hall A Wiki
Jump to: navigation, search

Back to Main Page >> Moller Page >> Moller Weekly Meeting Index

previous meeting << >> following meeting

Moller DocDB Meeting

Original Moller Polarimeter Page

Moller ELog

Connection details:

Meeting URL https://bluejeans.com/149766532

Meeting ID 149 766 532

US toll free phone 1.888.240.2560

Dial in, type in the meeting ID and then press ##


  1. GEANT4 simulation update -Eric K [1]
  2. GEANT3 simulation update -Bill H [2]


1. Discussion of GEANT4

Checked x-y hit distributions at various location using virtual planes in the simulation. Tried to track back the origin of the blob structure shown on the detector plane. Something weird shown at the Dipole exit. Hit plots look rotated, but it's because of Solenoid field.

Asymmetric hit distributions on the left and right hodoscope planes when coincidence hits are required. May come from asymmetric phi range in the generator.

Quad magnets seem to be not set well. Many particles hitting 3rd/4th quad shown from both G3 and G4. Stick with the same setting with Bill until we have better ones.

Suggestions: try check plots with Solenoid OFF. Set generated phi range symmetric.

2. Discussion of GEANT3

Bill showed his quad scan results at 2.2 and 1.1 GeV. For 2.2 GeV, we may look at the setting that was used for the data taking and scan around there. Sanghwa will send Bill the values. Dave suggested to try a strong focusing at Q1, and relax a bit in Q2 and do weak focusing again at Q3. Questions raised on what's at the entrance of the dipole. Dave mentioned that the movable collimators are out according to Sasha before. Some detailed drawings on this area would be useful.

Attendees: Bill, Eric, Don, Dave, Rich, Simona, Cip, Kent, Sanghwa