Link to October

Target lab status:
    target cell motion study:
 With water cell@pickup coil position, shift of the end of the frame was monitored by a micrometer locating by the pickup coil B side.
position:  0.200"
tighten the screws to fix the pipes: 0.196"
loosen the screws:0.200"
tighten again: 0.196"
move to reference cell position, and move down again: 0.193"
move up and move down again: 0.193"
 
 
 
 

11/08/2001

Target Lab

status:

•  Vince did systematic study for the water signal study:

   1.    moving the water cell verically at 6-8 different poistions.
   2.   moving the water cell horizontally at different positions .( finished 3 points, need  more)
   3.   change the position setting of  the pick-up coil positions.( problem: the signal showed  up in both channels)
• We got 3 lasers from Coherent campany, and the lasers are installed on the electronic rack
• Microscope and Micrometer are both available in the target lab
• Kevin helped to set up the spectrum analyzer
• Vince did corrections for the analysis of the cell wall thickness measurement
• Jindong continue the study on Q-coil.

• finish the water study .
• Xiaofeng and Jindong should start water cell study with heating pipes installed.
• Try to pin point the noise in the water signal
• start wall thickness meassurement for the reference cell used forA1

   Xiaochao introduced the new cuts, suggested by Nilanga, need to be applied on the analysis:

abs(det_x)<1 m , abs(det_y)<0.6m

For A1's data,  Xiaochao showed the run time difference extracted from the scaler clock   and  the detector event( (Fastbus ADC clock), which confirmed what was also found by Xiaofeng from g2's data.  We need more efforts to understand those time information in our data.

Xiaochao continued the study of  cut dependence on the Asymmetry.

Xiaofeng  continued the false asymmetry study on g2:

Due the wrong settting on the scaler trigger,  run2496-2562 needs to be reanalyzed starting  from the first scaler event. The result is shown( the top is without correction, the bottom is after correction):

cut study of the false asymmetry data. (no_cut, gemmetry_cut, gemmetry_pid_cut )

Water signal calibration. Try to get good signal :

1.  replace the aluminum shims with the plastic shims.
2.  remove the oven in-take and out-take pipes, since they seemed to affect the signal.
3   conduct water signal tests by changing the vertical position of the water cell in the pick-up coils. Will continue to do tests by changing the horizontal position and the position of the pick-up coils.

Checked the optical fibers with the coherent laser,  with the spare fiber being the best.

Received another coherent laser today, with  an optical fiber inside.