[Halld-tagger] beam line motors in Hall D

[Hovanes Egiyan]

Thanks Liping,

I will discuss this with people from Hall B, hopefully there is no issue 
with this.

Hovanes


On 04/14/2011 05:39 PM, Gan, Liping wrote:
> Hi, Hovanes,
>
> I agree with you that "gamma profiler" can be very useful to monitor the beam position and quality. We build the detector for PrimEx experiment with the help of Jlab detector group  some years ago. The electronics for the detector were partially from the university and partially from Hall B. I don't see any problems to use this detector in Hall D for particular experiments. On the other hand, I don't know the policy for the properties at Jlab.  If we want to use it as permanent Hall D  beam line device, we cannot make decision ourselves without talking to Volker first.
>
> Liping
>
> -----Original Message-----
> From: halld-tagger-bounces at jlab.org [mailto:halld-tagger-bounces at jlab.org] On Behalf Of Hovanes Egiyan
> Sent: Thursday, April 14, 2011 9:54 AM
> To: Franz Klein
> Cc: Hall D beam working group
> Subject: Re: [Halld-tagger] beamline motors in Hall D
>
> Hi Franz,
>
> I think it would be good to have a photon beam detector installed behind the GlueX detector similar to "gamma profiler" which Hall B uses for their photon runs, which is the one just in front of the total absorbtion counter in the alcove. For most of Hall B photon runs  it is the only device that continuously monitors photon beam shape and position after the collimator. By design characteristics our active collimator is better than  one in Hall B, but still it would be good to have such a device downstream of the target for continuous verification of proper beam transmission.
> Our collaborators from PRIMEX also have a similar "primex profiler", and if I remember correctly it was able to monitor the beam peak position with a sub-millimeter precision. It should be sensitive enough to show the shape of the beam in case the beam is off-center and is too asymmetric.
> Probably Ashot or Liping could tell us if we could use it  for these purposes in Hall D.
>
> According to the design, accelerator division will install a BPM and a viewer in the the electron beam dump labyrinth.
>
> Hovanes.
>
>
>
> On 04/13/2011 06:44 PM, Franz Klein wrote:
>> Looks right, Hovanes!
>> For the goniometer we have 3 rotational and 2 linear axes.
>> Does it make sense to have beam viewers in place (e.g. downstream of
>> Gluex detector and/or in the electron beam dump)?
>>
>> Greetings
>> Franz
>> On Wed, 13 Apr 2011, Hovanes Egiyan wrote:
>>
>>> Hi,
>>>
>>> I would like to compile a full list of remotely controllable motors
>>> which we will use  in Hall D so that we can to plan their controls. I
>>> came up with a preliminary list of the motors which is shown below.
>>> Please, let me know if there are other applications requiring remote
>>> motion control missing in this list,  or if some of these are not
>>> needed anymore or you think are redundant.
>>>
>>>
>>> o Goniometer  - 5 motors
>>>       3 motors for rotational motion?, 2 motors for linear motion
>>>
>>> o Microscope -  3 motors
>>>       3 positioning motors, linear motion for angular adjustment
>>>
>>> o Harps - 3 motors
>>>      1 tagger harp motor (accelerator control?), linear motion
>>>      1 tagger dump harp , linear motion
>>>      1 photon harp/PS converter, linear motion
>>>
>>> o Collimator 1 motor
>>>      1 motor for horizontal motion of the collimator, linear motion
>>>
>>> o TAC - 1 motor
>>>      1 motor to move Total Absorption Counter in and out of the
>>> beamline, not in the
>>>       baseline equipment , linear motion
>>>
>>>
>>> Thanks,
>>>         Hovanes.
>>>
>> ===============================================================
>>                    Franz J. Klein, Associate Professor
>>                    CUA, Department of Physics
>>                    Washington, DC 20064
>>    office: Hannan Hall 206          phone: 202-319-6190
>>    or: Jefferson Lab,CC F-243       phone: 757-269-6672
>> ---------------------------------------------------------------
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