Re: comments from the review

[Elke-Caroline Aschenauer <elke@jlab.org>]

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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