Log entry time 03:28:17 on April17,2004

Entry number 118213

Shower detector calibration.
1) Right arm Q3 put to 441A instead of -735A in order to insrease the hit area on the calorimeter.
2) 5uA, carbon target, T1=8k
3) run 2452 Q3=441A. The particle spot went to 80cm x 20cm
  (instead of 140cm x 10cm);
4) run 2453 Q3 - normal, R.septum=regular*0.98 (145.35A->142.44A)
5) run 2454 R.septum=regular*0.963
6) run 2457 mag. regular. Shower HV -50V

Result: only the central column of the shower is irradiated.
Defocussing Q3 makes the spot a bit wider in Y (and narrower in X).
The septum momentum chnage (-4%) made no difference.
HV and the optics are returned to the initial conditions.