PREX/CREX Oct 24, 2019 14:00

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Logistic information

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Agenda

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