Re: r4599 - trunk/src/programs/Simulation/hdds

[Alexander Somov <somov@jlab.org>]

Hello Richard,

The idea was to leave more space at the exit of the collimator
cave. The space needed for maintenace of the primary collimator
(and the beam pipe) was discussed with Tim and Slava - it should
be sufficient.

I would appreciate is you check the geometry. I committed files
to the repository with different names in order not to mess up
with a working version. I will submit a ps geometry shortly
and will let you know when I am done.

Cheers,
        Alex





On Tue, 16 Dec 2008, Richard Jones wrote:

> Alex,
>
> I see that you have begun checking in the revised geometry of the collimator 
> cave and pair spectrometer.  Did the entrance plane of the primary collimator 
> shift because the experiment was shifted downstream 85 cm?  I seem to 
> remember someone saying that this was necessary to have enough space to 
> insert/remove the BCal, once the pair spectrometer and associated shielding 
> were added to the hall layout.
>
> Please let me know when your updates are in, so I can begin checking the 
> revised geometry.
>
> -Richard J.
>
> Hall-D.SVN.Repository@jlab.org wrote:
>> Author: somov
>> Date: 2008-12-16 15:13:01 -0500 (Tue, 16 Dec 2008)
>> New Revision: 4599
>> 
>> Added:
>>    trunk/src/programs/Simulation/hdds/BeamLine_HDDS.xml_review2008
>> Log:
>>        Made the following changes in the composition 'collimatorStack':
>>   	  1. Added the composition BeamPipe0 describing a vacuum beam pipe at 
>> the entrance              of the collimator cave:
>>               - the beam pipe radius is 12.4 cm
>>               - the exit window: 250 micron Kapton with the radius of 10.14 
>> cm.  	  2. Moved the active collimator, DET1, and other components 83.96 cm 
>> upstream the              beamline.
>>           3. Changed layout of the 1st passive collimator to a composite 
>> W/Pb:
>> 	      - the inner part is a W  box,  5.08 x  5.08 x 20.0 cm3
>>               - the outer part is a Pb box, 30.48 x 30.48 x 20.0 cm3 
>> 4. Added  the vacuum beam pipe (Flange1 compositon) in front of the 1st 
>> sweeping              magnet:
>>               - use 150 micron Kapton entrance window
>>               - vaccuum goes all the way downstream the beamline until the 
>> GlueX detector.
>>           5. Modified the layout of the 1st sweeping magnet:
>>               - the outer dimensions are 29.2 x 24.8 x 355.6 cm3
>>               - the gap size is 10.22 x 4.9 cm2               - the field 
>> inside the gap is 0.23 T (integrated field is 0.82 Tm)
>>               - the elliptical vacuum pipe goes through the magnet. The 
>> semi-axes of the pipe               are 4.95 cm and 2.29 cm. 
>> 6. Added the concrete blocks around the 1st sweeping magnet, composition 
>> ConcreteWall1.              The size of the wall is 101.6 x 147.32 x 121.92 
>> cm3.
>>           7. Added the composition Flange2 to connect the 1st sweeping 
>> magnet with a vacuum chamber.
>>           8. Added a vacuum chamber after the 1st sweeping magnet with the 
>> following dimensions:
>>               - 50.8 cm long tube with the inner and outer radii of Rin = 
>> 9.83 cm and Rout = 9.85.
>>           9. Added the small lead wall after the vacuum chamber, 
>> composition LeadBand1.
>>          10. Added the composition Flange3 to connect the vacuum pipe 
>> between the lead band and the
>>              2nd collimatoor.
>>          11. Changed material of the 2nd collimator from Nickel to Iron. 
>> The default pinhole              diameter was changed from 1 cm to 0.6 cm.
>>          12. Added the composition Flange4 to connect the vacuum pipe 
>> between the 2nd collimator and
>>              the 2nd sweeping magnet.
>>          13. Changed the layout of the second sweeping magnet:
>>               - outer dimensions are 42 x 20.8 cm2
>>               - the gap size is 20.3 x 5 cm2, the field in the gap is 0.23 
>> T
>>               - 1.75 cm radius vacuum beam pipe goes through the magnet. 
>> 14. Added the composition Flange5 to connect 2nd the sweeping magnet with 
>> the vacuum beam              pipe.                    15. Added a 1m long 
>> vacuum beam pipe. The inner and outer radii are 2.38 and 2.54 cm, 
>> respectively.
>>          16. Added the small lead wall (composition LeadBand2), 81.28 x 
>> 20.32 x 10.16 cm3.
>>          17. Placed the vertical plane DET2 after the lead wall. 
>> 18. Added the composition Flange6 to connect the vacuum pipe between the 
>> lead wall and              a pair spectrometer converter box. 
>> 19. Added the pair spectrometer converter. The converter thickness and 
>> material can be set
>>              in the box 'PTAR'   <box  name="PTAR" X_Y_Z="1.0  1.0  0.0445" 
>> material="Aluminum" />.
>>          20. Added the composition Flange7 to connect the vacuum pipe 
>> between the converter and              the concrete wall.
>>          21. Modified the size of the concrete shielding wall to 450.0 x 
>> 270.0 x 121.92 cm3.
>>              Added passage to the collimator cave.
>>          22. Decreased thickness of the lead wall to 5.08 cm (size of the 
>> lead brick).
>> 
>> 
>>
>> 
>
>