Difference between revisions of "CDC algo status"

Revision as of 17:28, 10 January 2014

Add simplifications to offline code to show impact

Using prototype data from CDC_50_50 (run 31942) with offline analysis

50/50 Ar/CO₂ and cosmics, 2100V, prototype horizontal

Only 20 samples upsampled

1. Event pedestal is mean of 100 samples ending at trigger time
2. Find hit threshold crossing
3. Upsample 20 samples starting 10 before hit threshold crossing
4. Find hit threshold crossing again in upsampled data
5. Step back <pedlead> points to find new local pedestal
6. Search forward to find high threshold crossing
7. Search backward to find low threshold crossing
8. Project through both thresholds to find pedestal crossing time

Thresholds 5-4-1 pedlead 16 tz 7 tfix 1000

Selected results below

more details here

Simplifications (one at a time)

Event pedestal is mean of 4 samples

Local ped mean of 4 and 5 samples before hit threshold

Combined simplifications (20 samples upsampled)

Event ped is mean of 4 samples, local ped is mean of 4 and 5 samples before hit_thr	As left, but no interpolation when finding high and low thresholds	As far left, hit time is interpolated low threshold crossing time
As above, hit time is low threshold crossing time without interpolation

Image with blue and green borders are from single threshold crossings; images with green borders are without interpolation.