Here is a data library with PMT signals with different attenuators. The dynamic rage is from 1 pC to 2000 pC. The data are collected using R5900 PMT with active dividers and 676 V. Patrick's LED 4 ns width and David's setup

Download signal data from https://atlaswww.hep.anl.gov/asc/phase2/data/, and then gunzip it. To make a plot for 1 trace, use

wget --no-check-certificate https://atlaswww.hep.anl.gov/asc/phase2/data/pmt_signals_phase2.tgz -O - | tar -xz;
cd pmt_signals_phase2/
python show_trace.py data/D1_traces_full.txt.gz 1

We used 1 neutral density filter 50% (NDF50), and 1 neutral density filter x16 (NDF16). Data files with traces are in “data/*”. the file names has a letter “D” that indicates attenuation strength for the light.

1. D1 NDF16 + 6xNDF50
2. D2 NDF16 + 5xNDF50
3. D3 NDF16 + 4xNDF50
4. D4 NDF16 + 3xNDF50
5. D5 NDF16 + 2xNDF50
6. D6 NDF16 + 1xNDF50
7. D7 NDF16 (light reduction by a factor 16)
8. D8 3xNDF50
9. D9 2xNDF50
10. D10 1xNDF50 (light reduction by a factor 2)
11. D11 - no NDF

All figures for 1000 traces are in “figures”. We use a numeric noise suppression as shown in this image.

Blue lines show traces before the noise, and small grey dots after the noise suppression. The green dots shows the noise in the LED driver.