[Halld-tagger] Fwd: Hall D Ion Chambers (fwd)

[Dave Mack]

Sascha,

Depends on what they are used for.

If an ion chamber is used for beam tuning, get anything you think you 
might need to make your life easier during commissioning. And work with 
Spata to make sure that the gains on the ion chambers will be high 
enough to actually see a signal in Hall D that's above the leakage current.

If an ion chamber is used for so-called machine protection in the fast 
shutdown system (eg, a threshold set on the one near the tagger dump?), 
it may be useful to have a pair at that location. If one fails, it can 
be masked after a quick call to Arne and you'll be running again an hour 
later. Otherwise, you're down for a day until it gets fixed or swapped. 
The priority is low though, since 12 GeV project funds are tight and  
you can always add another ion chamber later out of Ops funds.

Dave

On 2/19/2013 3:11 PM, Alexander Somov wrote:
> Hi,
>
> It doesn't seem that we need other Ion Chamber monitors. Any ideas ?
>
> Thanks,
>         Alex
>
>
> ---------- Forwarded message ----------
> Date: Tue, 19 Feb 2013 13:03:57 -0500 (EST)
> From: Mike Spata <spata at jlab.org>
> To: Alexander Somov <somov at jlab.org>
> Cc: Todd Satogata <satogata at jlab.org>
> Subject: Fwd: Hall D Ion Chambers
>
> Hello Alex,
>
> Here is the baseline plan that I am paying for. Anything in addition would have to be accounted for through a change request either on 12CMPS or a Hall D account of your choosing. We cover all of the scope associated with these devices.
>
> 2 x IC at the flank of the goniometer
> 2 x IC at the shield wall
> 1 x IC at the dump
>
> Regards,
> Mike
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