PREX/CREX Oct 24, 2019 14:00

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Logistic information

 BlueJeans calling instructions:
 Toll-Free Number (U.S.&  Canada):  888-240-2560
 International toll number:         408-740-7256
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 Offline room:   CEBAF Center F224-225


  1. Ongoing CREX prep activities: all
    • CG: what is the startup schedule? KP: latest Gant chart from B-team shows that beam tests to the halls on Nov 13th.
    • KP: the compton laser has dropped in power quite a lot. work will be needed in early November.
    • KP: target cooldown has been moved to before thanksgiving.
    • DM: working on the wiki to update the instructions for CREX (while saving the PREX instructions). CC: basically duplicated the information by adding PREXII in the page name.
    • CC: took test runs with the cavities by injecting signal. will repeat for digitals. log entries created (1% non linearity for analogs)
    • CG: will send Jack an email about power supply for septum
  2. SAM cans: Ciprian
    • CG: details ironed out last Friday with Machine Shop at SBU. Manufacturing slated to start tomorrow or Monday.
    • CG: vacuum testing system waiting on a convertor flange. We will get it Oct 30th (just in time with the first cans)
  3. Injector laser work: Caryn
    • CP: defining the settings for all 4 lasers. we did the cathode rotation. on the 29th we may be able to do pos diff feedback. we will run at 120Hz.
  4. Detector linearity: Devi
    • DeA: mentioned before the degradation of the current during PREX. made measurements of the anode currents with the same setup as before the run. DM: there was a degradation in the dinode or base (the cathode seems to be fine). we tried to minimize the changes in the setup.
    • DeA: the non linearities are all small before and after. KP: very impressive.
  5. PREX targets: Silviu
    • SD: the one with the cracked graphite is #5 on the ladder (208Pb2), the one with the raster pattern is 208Pb3.
    • SD: we also seemed to be pretty well centered.
    • CP: a picture of the front and back would be useful.
    • SD: 208Pb8 is the one with a piece of diamond off
    • SD: 208Pb6 is the one that looks good in the last picture and we ran 85uA on it.
    • SD: Dave M said it was not badly damaged and he cleaned the surface with radCon help. He plans to install it back. DM: wonder if there is a raster pattern on it.
    • KP: will throw some updated pictures on the docDB
  6. Other


In F245

Ryan R, Devi A, Juan Carlos C, Ye T, Tao Y,


Sanghwa P, Ciprian G, Jinlong Z, Yufan C, Cameron C, Alexandre C, Caryn P, David A, Jim N, Mark D, Paul K, Siyu J, Dustin M, Devaki P, David A, Iris H, Silviu C, Kent P, Devi A, Guido U, Ezekiel W, Rakitha B,

Cannot make it