ChronoBunching

1. ChronoBunching Melanie Day University of Rochester 10/7/09

2. What is Chronobunching? What is Chronobunching? • Every hit has a TDC time from the TFB • Includes real event hits and crosstalk hits • Want to be able to distinguish event signal from crosstalk signal • Want to be able to separate different events in the same gate • A “chronobunch” is a bunch of hits linked together based on several factors • Being close in time • Being close to hits with sufficient energy • Having an edge, with few hits within a certain time from the edge • Crosstalk hits are randomly distributed and usually far apart in time • Do sometimes get small bunches of crosstalk hits(not yet confirmed if they are crosstalk or tail of event signal though) • Accuracy good for large signal peaks

3. Algorithm Part I

4. Algorithm Part II

5. Typical Time Graph

6. Algorithm Part III • Currently consider hits with >4pe “good” hits • Require 2 “good” hits and 10 pe for a bunch • End bunch or restart algorithm if <1 nearby “good” hits

7. Chronobunching Result Evt. Bunch Start End #hits 2 1 864 1034 4 2 2 3096 3184 4 2 3 4564 4660 60 2 4 4693 4914 5 2 5 5432 5459 4 Working to find ways of distinguishing between crosstalk bunches and event bunches

8. Conclusion and Future Work • Can find main signal peak easily with current algorithm • Want to make sure edges are precise • Want to find a way to distinguish between small crosstalk bundles and signal bundles • Considering using position in the p0d and pe distribution of the bundles as discriminators

9. The End

10. Backup Slides