Things to worry about for the ERR

Bob Michaels, May 2017

In brackets [] is the bullet number from the 2016 Readiness Review Report.

In parenthesis () is my unofficial answer.


1. Completion and commissioning schedule.  Task list. [1]
  (Kent will present this.  We don't have a detailed commissiong schedule
   but it will be similar to what we did for the PREX-I run: 
   Global Run Plan (PREX-I) and Daily Run Plan (PREX-I)  )

2. Characterization and removal of oxide layer from Ca48. [2]
   (Seamus has this in his talk.)

3. Progress on target chamber. [2]
  (Design well underway, some pieces in fabrication, see Silviu's talk.)

4. Design of support and alignment structure for target. [1]
  (Discussed by Kent and Robin.)

5. "Keep outs" to reduce mechanical conflicts. [1]
  (Robin may address this, but it's basically automatic given
  the engineering modeling tools they use.)

6. Thermal analysis of time-dependent ramp from 4K (where diamond's
   conductivity is small) to equilibrium temperature. [3]
   (Silviu did this and will present it.  It looks good.)

7. Detailed LCW estimate to check if available pressure drops in
   Hall A produce the required flow rate for all magnets. [4]
   (Robin will present this.  It looks good.)

8. Shimming the septum gap : how much does this reduce vertical
  acceptance ? [4]
  (It does cut a few percent of our figure of merit, but this is taken into account.)

9. Check Q1 fringe fields on beam deflection, and check if magnified
   beam spot is safe for beam dump. [5]
   (We're working on getting an updated field map, then Yves Roblin
   will check the optics.)

10. Activation Calculations. [8]
  (To be presented by Kent.)

11. Sky-shine shielding. [8]
  (To be presented by Kent.)

12. Evaluate cooling of collimator. [8]
  (Water cooling takes away 2 kWatts.)

Additional Items

1. Machine protection from beam loss using ionization chambers. [2]
 (Yes, ionization chambers are foreseen.  They are standard.) 

2. Procedure to remove and store Ca48 target after experiment. [2] 
 (Seamus has this in his presentation. )

3. Procedure to teardown experiment which reduces radiation exposure.[8]
  (The collimator is retracted into a radiation jacket, etc.  OSPs being written, etc.)

4. Methods to improve thermal contact with lead or find better alternatives.[3]
  (To be discussed by Silviu and by Seamus.)

5. Is the gate valve downstream big enough ? [8]
  (Yes, it is.)

6. Do more work on the EHS&Q documentation, particularly for activation
  of target, impact on personnel during operation, changeover between
  PREX and CREX. [6, 11]
  (Better "templates" of the EHS&Q documents exist now, but they still 
   need work.  In particular, we need to upgrade to the correct format
   https://www.jlab.org/div_dept/physics_division/osp-guide.html )