Re: comments from the review

[Alexander Somov <somov@jlab.org>]

Hello all,

Yes, as far as I know Moeller scattering (are Bhabha) are included
into Geant3.21 (PHYS330, PHYS331 geant manual). I will double check...

Cheers,
       Alex


On Thu, 20 Nov 2008, Elke-Caroline Aschenauer wrote:

> On Thu, 20 Nov 2008, Jim Stewart wrote:
>
> Dear Jim,
>
> I have 2 more items on my list which are minor compared what you listed
> already.
>
> 1. the power cycling of the tagger magnet, is the current power supply
>  able to inverse the polarity or do we have to add something to do it.
>
> 2. a question for Alex, are moeller electrons really included in your
>  geant simulation.
>
>
> Cheers elke
>
>> Date: Thu, 20 Nov 2008 14:09:01 -0500
>> From: Jim Stewart <jstewart@jlab.org>
>> To: tagger list <halld-tagger@jlab.org>, James Lagner <jlagner@jlab.org>
>> Subject: comments from the review
>> 
>> Hello Everyone
>> 
>> There were several suggestions made during the review which I think we
>> should follow up on.
>> 
>> 1) One suggestion was to mount a wire in the goniometer so that we could
>> scan the profile of the
>> electron beam.
>> 
>> 2) It was suggested to use high tensile strength rods through the magnet
>> to hold it together instead of bolts.
>> The rods could be pre-stressed with an hydraulic  press and then the
>> bolts snugged. This is less machining
>> and easier than all the bolts. We still need to look into how much
>> stress is in the piece over the pole.
>> Here we will need the bolts but the force will be less.
>> 
>> 3) It was also suggested to use cylindrical pins to fix the alignment of
>> the plates to each other. This is illustrated in
>> the attached figure. Once the magnet is adjusted and bolted together
>> then the holes for the pins can be bored and
>> the pins inserted. Three pins are probably reasonable.
>> 
>> 4) It was suggested that it may be difficult to take the middle-top iron
>> off the middle-bottom without
>> damaging the vacuum vessel. It was suggested that we foresee  the
>> possibility to use 3 jacks to lift the
>> iron up the first 10 cm by hand before moving it with a crane.
>> 
>> 5) It was pointed out that the way the water circuits in the coils were
>> organized could effect the
>> heat exchange efficiency. We should get an example for how to organize
>> the cooling paths.
>> 
>> 6) It was suggested to look into incorporating the iron plates which
>> reduce the gap in the pair spectrometer
>> into the top and bottom walls of the vacuum chamber.
>> 
>> 
>> Did I miss anything?
>> 
>> Jim
>> 
>
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