Place: 3F Bldg 3, KEK
Time:  10:30, 97/06/06

[0] Agenda
   
   0.1) CAL R&D Status
   0.2) VTX R&D Status
   
		
[1] CAL R&C Status (Suzuki)

   	The beam run started on May 24 and finished on June 2.
	In this beam test, emphasis is put on the measurements
	of the calorimeter response in the scintillator-rich
	region. The measured points are as follows:

		Pb:Sci	=  6mm : 2mm
			= 10mm : 2mm
			=  8mm : 2mm
			=  4mm : 2mm	

		Pb:Sci  = 16mm : 6mm
			= 16mm : 4mm
			= 16mm : 2mm  
	
	In addition, EM(4:2)+HD(8:2) configurations were
	tested, varying the radiation length of the EM section
	from 20 X0 to 30 X0.

   	In spite of a lot of hardware troubles with readout
   	electronics, the data taking was completed more or
   	less as planned. Online monitor assured the quality
   	of the data, but solid conclusions must await detailed
   	analysis. First results are expected in one week.
   	
[2] VTX R&D Status (Tsukamoto & Miyamoto)

	Tsukamoto explained the goals of the beam test and
	Miyamoto reported its current status.
	
	To be tested in the beam run are
	
	  a) Temperature dependence (-15 C -> 25 C)
	  b) Readout time dependence (4sec, 1.3sec)
	  c) Angle dependence        (90, 45, 30 degrees)
	
	for 2 kinds of CCDs, one with 10 micron and the other
	with 50 micron thick sensitive regions. Both of them
	have 512 x 512 pixels with a pixel size of 24 microns 
	x 24microns. 

		10 microns	50 microns	10 microns

		|\		|\		|\	
		| \		| \		| \
	---------- |-------------- |-------------- |------->
		|  |		|  |		|  |
		 \ |		 \ |		 \ |
		  \|		  \|		  \|
		  
	Miyamoto showed some sample beam data, demonstrating
	MIP signals clearly separated from the dark current
	background. When a single frame data are superimposed
	for the three layers, one can see clear 3-hit clusters
	corresponding to penetrating tracks.
	
	The beam run lasts till Monday morning.