The following show the spread of adc values recorded from all the flashed
channels in the detector, for 10 different pulse heights.
(led_one data file was corrupt, hence only seven pulse levels...)
led_one_spread.ps
led_two_spread.ps
led_three_spread.ps
led_four_spread.ps
led_five_spread.ps
led_six_spread.ps
Some histograms of the mean adc for all channels, at the brightest flasher setting. The first plot in each is the raw data, the second has been weighted according to the light injection cable *brightness* for that channel , so they effectively show the non uniformity due to the LIMs and PMTs. However, due to the method of correcting for flasher cable brightness, the mean adc value has no meaning, the only useful number is the RMS showing the non uniformity.
Led_1_adc_spreads.ps
Led_2_adc_spreads.ps
Led_3_adc_spreads.ps
Led_4_adc_spreads.ps
Led_5_adc_spreads.ps
Led_6_adc_spreads.ps
For LEDs 1, 2 and 3 I was able to redraw these plots in terms on npe. So theoretically these plots should remove the non linearity due to the PMTs, and just show the contribution due to the LIMs... Similarly to above, the second histogram in each has no real absolute value.
Led_1_npe_spreads.ps
Led_2_npe_spreads.ps
Led_3_npe_spreads.ps
This allowed me to look at the LIM to LIM differences along the detector.
The following plot contains ten small histograms, each of these representing
a fibre position in a LIM. Each small histogram then shows the LIM
to LIM variation along the detector.
Lim_spread_example.ps
These plots show example adc/pin plots.
pin_adc_led_2.ps
pin_adc_led_2.ps
led2_1.ps
led2_2.ps
led_6_one.ps
Robert Morse --
The problem with graduate students, in general, is that they have to
sleep every few days....