[PEPPo] Weekly Meeting, Wednesday 11/9 @ 10:30EST

[Yujong Kim]

Dear all,

Fortunately, the beam size on the second target region is somewhat big due
to big dispersions (~ 1 m) after
the spectrometer.

Full width of electron beam is about 6 mm, and its rms beamsize is about 1
mm.

If we operate in the pulsed mode with a lower current (~ 10 nA), it will be
safe.
But we need its detailed review against any accident.

I attached the electron beam profile on the second target in this e-mail.

Sincerely yours,

Yujong Kim




On Tue, Nov 8, 2011 at 9:59 AM, Eric Voutier <voutier at lpsc.in2p3.fr> wrote:

>
>    Sounds more than reasonable!
>
>    I would also add to the previous comments that even in the CW runnning
> for polarimeter calibration,
>    beam currents will not exceed tens of nA, so no damage to the vaccum
> windows are expected.
>    Eric
>
>
> Le 08/11/2011 11:22, Matt Poelker a écrit :
>
>> On the subject of "check out with electron beam", I am going to require
>> you to write a test plan, and to have it reviewed by knowledgeable Ops
>> staff, like Mike Spata, Jay Benesch, Geoff Krafft and/or Mike
>> Tiefenback.  The obvious big concern here....how do you plan to avoid
>> burning a hole in the exit foil downstream of the spectrometer?  and if
>> you do burn a hole in the exit window, what are the expected consequences?
>> Matt
>>
>>
>> Joseph Grames wrote:
>>
>>> Dear PEPPo Collaborator,
>>>
>>> We will meet tomorrow Wednesday 11/9 at 10:30EST, locally in ARC428
>>> and by call-in is 757-269-6121.
>>>
>>> Eric&  I would like to discuss two topics:
>>>
>>>
>>> *System Readiness* - please post your punchlist of remaining tasks
>>> necessary to complete your system to the wiki, meaning all the steps
>>> you envision before we are in a position to use/test your system with
>>> beam.  This should include hardware, software, procedures,
>>> documentation, cables, labels, jobs in the service building, jobs in
>>> the tunnel.  Anything you can envision.
>>>
>>> == (WIKI) ==>  https://positron.jlab.org/**wiki/index.php/November_9%2C_
>>> **2011 <https://positron.jlab.org/wiki/index.php/November_9%2C_2011>
>>>
>>> *Check-out with electron beam* - please prepare a straw man for the
>>> first test you would like to perform with 6.3 MeV electron beam,
>>> meaning who will/can do the test, prerequisites, clock hours needed,
>>> possible accesses needed, range of beam current or polarization,
>>> hardware/software configurations.  Beam tests plans should be
>>> submitted using ATLIS (go to web site, login, choose create, pick a
>>> title beginning with "PEPPO:", fill in the blanks the best you can).
>>> If offsite then use proxy to access web site.
>>>
>>> == (ATLIS) ==>   http://opsweb.acc.jlab.org/**CSUEApps/atlis/atlis.php<http://opsweb.acc.jlab.org/CSUEApps/atlis/atlis.php>
>>>
>>>
>>>
>>> ------------------------------**------------------------------**
>>> ------------
>>>
>>> ______________________________**_________________
>>> PEPPo mailing list
>>> PEPPo at jlab.org
>>> https://mailman.jlab.org/**mailman/listinfo/peppo<https://mailman.jlab.org/mailman/listinfo/peppo>
>>>
>>>
>>
>
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