RE: Primex beam requirement

["Gan, Liping" <ganl@uncw.edu>]

Hi, Richard,

The plot I showed at the meeting is for collimator R=2 mm without taking the electron emittance 
into account.


Liping 


-----Original Message-----
From: owner-halld-tagger@jlab.org on behalf of Richard Jones
Sent: Sat 12/6/2008 6:00 PM
To: Gan, Liping
Cc: Hall D beam working group; Ashot Gasparian
Subject: Re: Primex beam requirement
 
Liping, ok provided that your collimator radius is the same as mine.  Did you use R=1.7mm like I did?

-rtj


Gan, Liping wrote: 

	Dear Richard, 

	I agree with you. I did not have electron beam emittance in my simulation. Since your results look similar to mine, it indicates the electron beam emittance under current beam line design has samll impact on the photon beam spot size on target.


	Liping 


	-----Original Message----- 
	From: owner-halld-tagger@jlab.org on behalf of Richard Jones 
	Sent: Sat 12/6/2008 11:26 AM 
	To: Gan, Liping 
	Cc: Hall D beam working group; Ashot Gasparian 
	Subject: Re: Primex beam requirement 
	  
	Ashot, Liping: 

	Those requirements are within the capabilities of the tagger and collimation system that we have in our current design for the Hall D photon beam.  I have carried out a more complete simulation of the photon beam spot at the position of the gluex target than what Liping did.  You can compare the two plots (x and y projections of the beam spot profile) below with Liping's profiles.  They look similar to me.

	http://zeus.phys.uconn.edu/halld/primex/beam-12-2008/xtarg_beam.gif 
	http://zeus.phys.uconn.edu/halld/primex/beam-12-2008/ytarg_beam.gif 

	-Richard J. 


	Gan, Liping wrote: 

	        Dear Richard, 
	         
	        According our discussion at the meeting, here is updated beam requirement for PrimEx experiment. 
	         
	        Best regards, 
	         
	        Liping 

	         

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