1 PMT Base Prototypes Comparison using DOMMB ATWD August 6, 2003 Nobuyoshi Kitamura UW-Madison / SSEC.

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Presentation transcript:

1 PMT Base Prototypes Comparison using DOMMB ATWD August 6, 2003 Nobuyoshi Kitamura UW-Madison / SSEC

2 Method Terminal server connected by Python socket program* ATWD chan3 connected to LED pulser current (analog MUX = 2)* CPU trigger on ATWD#0 and capture data* (*Script by Kael Hanson) The rest was also done with a python script (by NK). Background (baseline measurement) with coax connected to dommb but the ribbon cable removed. 100 samples averaged and stored in a file (tagged with a dom ID). (Only 100 samples because of python program speed) Repeatedly captured waveforms (~1Hz), subtracted baseline and displayed on monitor. At random intervals, captured screen (ALT-”print screen”), and pasted to this document. Ten such screen shots are shown here for each configuration. The vertical scale is the ADC counts. 8/6/2003 N. Kitamura

3 Samples DOMMB only—stand-alone DOMMB in Chamberlin Hall accessed from PSL. The analog input was shunt with a 100Ohm resistor. EMCO—measured with DAC=0 (HV=0) and DAC=2000 (HV=1000V). Old Iseg—single ground configuration. Measured with DAC=0 and without enableHV(), but the on-board oscillator was always on. New Iseg—the split grounds were bridged with a 1MOhm resistor. In addition, the “clean ground” wire was on. The measurement was done under the same conditions as Old Iseg. 8/6/2003 N. Kitamura

4 Summary / Conclusion (tentative) Fairly large noise is seen in chan0 even with no HV base connected to DOMMB. (Is this a fair measure of the input channel quality?) All the HV base configurations introduce noise to some extent The EMCO base and Old Iseg add somewhat comparable levels of noise to the channels The New Iseg introduces very high levels of nose 8/6/2003 N. Kitamura

5 DOMMB only 1 8/6/2003 N. Kitamura

6 DOMMB only 2 8/6/2003 N. Kitamura

7 DOMMB only 3 8/6/2003 N. Kitamura

8 DOMMB only 4 8/6/2003 N. Kitamura

9 DOMMB only 5 8/6/2003 N. Kitamura

10 EMCO (dac=0) 1 8/6/2003 N. Kitamura

11 EMCO (dac=0) 2 8/6/2003 N. Kitamura

12 EMCO (dac=0) 3 8/6/2003 N. Kitamura

13 EMCO (dac=0) 4 8/6/2003 N. Kitamura

14 EMCO (dac=0) 5 8/6/2003 N. Kitamura

15 EMCO (dac=2000) 1 8/6/2003 N. Kitamura

16 EMCO (dac=2000) 2 8/6/2003 N. Kitamura

17 EMCO (dac=2000) 3 8/6/2003 N. Kitamura

18 EMCO (dac=2000) 4 8/6/2003 N. Kitamura

19 EMCO (dac=2000) 5 8/6/2003 N. Kitamura

20 Old iseg 1 8/6/2003 N. Kitamura

21 Old iseg 2 8/6/2003 N. Kitamura

22 Old iseg 3 8/6/2003 N. Kitamura

23 Old iseg 4 8/6/2003 N. Kitamura

24 Old iseg 5 8/6/2003 N. Kitamura

25 New Iseg 1 8/6/2003 N. Kitamura

26 New Iseg 2 8/6/2003 N. Kitamura

27 New Iseg 3 8/6/2003 N. Kitamura

28 New Iseg 4 8/6/2003 N. Kitamura

29 New Iseg 5 8/6/2003 N. Kitamura