[Halld-tagger] TPOL beam spot

[dugger]

Hi,

Richard informed me that there was a question regarding the effect on 
the analyzing power of TPOL due to a larger beam spot we will have at 
lower photon energy, and that a detailed simulation might be required to 
answer the question.

I agree with Richard. Simulations need to be performed to see how the 
analyzing power changes for a larger beam spot.

I will do some archaeology to find the code I used for the previous 
beam-spot study and then move forward with a new study using a larger 
beam spot.

Take care,
Michael