PREX/CREX Thursday, February 20, 2014 10:00am EDT

The teleconference info is as follows:

       Phone #: 1-866-740-1260
       Code: 6931422

Agenda

Updates from Rakitha,

Plastic Shielding Design Update - 2 elog-2940
Full Simulation for Radiation in the Hall with Updated Plastic Shielding elog-2941

Present:
Rakitha, Dustin, Paul, Lorenzo, Nickie, Seamus, Guido and Kent

Discussed about the plastic shielding optimization, see below for some of the points discussed.
Simple estimate of the lifetime for Plastic shielding,
- Based on radiation limit on plastic of 5 x 10^8 rad and photon power deposited on plastic of 3 W at 100 uA (see elog-2940), the gamma tolerance is about 193 days per kg
The photon damage is prominant compared to the neutron damage simply by the scale factors in the flux and power.
With a absorber, there is about 2 W of power deposited in the plastic. This appear to be no melting issue but it would be nice to estimate thermal damage to the plastic shielding
- Most of the heat is deposited on the edges of the plastic shielding (see Figure 3 on elog-2940)
Tungsten as the absorber is not practical due to shape we need it and the cost.
- As the next step, Try copper where we could go as high as 5 mm in thickness as a practical matter.
Since we have basic idea about what we want to do for shielding we could also discuss this with engineering

Organizing a PREX Collaboration meeting (disussed in 02/6 and 02/13 of 2014 meetings)
Have a optic calibration run plan (disussed in 01/16/2014 meeting)
It would be nice to have real-time viewer for optics studies in commissioning (disussed in 01/16/2014 meeting)

TO DO Lists link: PREX, CREX