[Halld-tagger] beamline motors in Hall D

[Hovanes Egiyan]

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
> ---------------------------------------------------------------