PREX/CREX May 11 2017 1:00pm EDT

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Logistic information

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 Room IRL:                            CEBAF F227


  1. Caryn: Q1 fringe calculation haplog 3408
    • look at the slides in att7
    • BM: where is the beam in the figures? KP: the center. on slide 2 the circles are the appertures for the Q1
    • CP: the gradiants are 20% smaller
    • SR: since everything is on the order of 10s of gaus/cm, so we should not worry about it. KP: this is a question because of the problems that APEX is having.
    • KP: the point is that this should be good enough for the ERR if we don't have a full result from Juliette
    • SR: we should calculate the field integral. KP: will do that.
  2. Juliette: Q1 fringe field in TOSCA haplog 3409
    • JM: found a configuration that works in TOSCA. Now have fields for both quads and can get a field in between for each. They will cancel. Plan is to merge the 2 quads and 1 septum into a single simulation and run over night.
    • JM: this is a simplified model. I would be confident to use this for optics. The stray field around the beamline is probably good enough.
    • KP: asked to evaluate fields but no-one expects that to be a significant problem. Secondly evaluate if the fringe from the septum will produce another field with the iron in the Q1.
  3. Kent (for Lorenzo): Activation plots haplog 3410
    • KP: he has some dose cycle (still need to get details). He shows in att3 after 1 month of cooldown. Red is 1000 rem/h/cm2.
    • KP: it's not clear what the radiation from the beampipe is.
    • SR: this is all on contact.
    • KP: att 1 is the spectrum of stuff coming off the collimator (photons and electrons). According to this plot, beta is smaller and softer (below 1MeV). The gammas are about 100 times more.
    • KP: Alan G has been working on how to remove this collimator. He has a nice way to do a flange that is similar to a clamp simplifying the de-installation process.


Tyler K, Tao Y, Juliette M, Kent P, Silviu C, Bob M, KK, Sanghwa P, Ciprian G, Caryn P, Dustin M,