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

[Alexander Somov]

Hi Dave,

Thanks for the feedback. I worry more about the fast shutdown
procedure. We've asked to add 2 ICs after the goniometer to be
able to shut the beam down if we start melting a wire from
the crystal  support frame or smth like this...

I am not sure that ICs will be used for the beam tuning, the
BPMs should probably be enough (maybe I'm mistaken)

Cheers,
        Sascha



On Tue, 19 Feb 2013, Dave Mack wrote:

> 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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>
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