[Moller_simulation] position of target in sims

Juliette Mammei crowder at jlab.org
Fri Nov 2 15:24:57 EDT 2018

Dear all,

I believe that the target position in the simulation is incorrect.  
According to Robin's drawings, it looks like the target is at least 5 m 
upstream of the pivot/hall center, not 4 m, as I believe is in the 
current simulation.    I just talked with Jay and he tells me that in 
his layout the target center is indeed 6 m upstream of the pivot.  So I 
believe this is the correct value.

For optics this is okay, because the spectrometers and detectors are 
placed relative to the target center.

But for shielding design this could be a problem, because it has to be 
designed around the pivot and spectrometers.  I believe Wouter has 
discovered the resulting lack of space between the wall and the detector 
region.  There should be 2 more meters there, assuming Jay is correct.

I have send an email to Robin to ask about the position in the CAD 
drawings that she has shown, and I am waiting for a response.



Dr. Juliette Mammei

Assistant Professor
Department of Physics and Astronomy
University of Manitoba
Winnipeg, Manitoba
R3T 2N2 Canada

Office: 1-204-474-6195

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