From:	KEKVAX::TERADA       11-MAY-1998 15:51:15.04
To:	YOSHIMUR
CC:	IMAZATO,MINORU,BANPAKU,YAMANOI,NUMAJIRI,KONDO,UNNO,KOHRIKI,TERADA
Subj:	beam request for p-irradiation (T363)

May 11th, 1998
S.Terada; KEK

Subj:	Request for a proton irradiation (T363) at EP1-A


Dear Yoshimura-san,

	We want to carry out a proton irradiation on silicon detectors 
developed for the ATLAS experiment (T363) at the beginning of the next 
beam cycle which will be starting on June 3rd, 1998.
Outline of our plan is as follows;

Purpose: To verify radiation hardness of the newly developed silicon strip 
         detectors for the ATLAS experiment.

Setup: The samples are placed in the coldbox equipped with Peltier 
	thermo-cooler units to be cooled down to -5 deg. C.
	To reduce materials intercepting beams the samples inside the 
	coldbox is arranged into two rows, upper and lower rows.
	The cold box is moved by using a remote controlled movable table 
	so as to irradiate the silicon detector as uniformly as possible. 
 
Target fluences:
	 3.0 x 1014 protons/cm2  uniformly over the area of 64 x 64 cm2 x 2rows 

Expected exposure time:
	24 hours in total

	    We assumed an extracted beam intensity as 2 x 1012 ppp in every
            3 seconds.

Materials and their thickness intercepting the beam at upstream of EP1-A: 
 1. Upper row;
    	 Silicon detector (64 x 64 x 0.3mm3) ---------- 8         0.026 X0
     	Al. foil (0.1mmt) + Mylar (0.1 mmt)   -------- 1         0.001 X0
        Cold box walls--------------------------------    	0.02   X0
   	        Total:  0.047 X0

 2. Lower row;
    	 Silicon detector (64 x 64 x 0.3mm3) ---------- 8         0.026 X0
     	Al. foil (0.1mmt) + Mylar (0.1 mmt)   -------- 1         0.001 X0
       Cold box walls-----------------------------------	0.02   X0
   	        Total:  0.047 X0

Schedule:

   June 1st (Mon.) 10:00 - 17:00; to tune up the movable stage 
   June 2nd (Tue.) 14:00 - 17:00; to set up the movable stage and the cold box 
                                  at EP1-A beam line   
   June 3rd (Wed.) 9:00 21:00; Beam exposure for the upper row
   June 4th (Thu.) 9:00 21:00; Beam exposure for the lower row 
	
   July 6 (Mon)  14:00 - 15:00; To take out the coldbox from EP1 area and
				bring them to the radiation safety building 
				for activity measurements.

	

Best regards,
Susumu Terada