Thanks to Karin for slides

Hits in neighbouring detectors rejected

2 hits in non-neighbouring detectors accepted if the TOF difference < 5ns

S M Lenzi et al PRL 87 122501

Issues

1) Mistake in energy calibration of the signals made by Darek Wolski during his visit to fix problems on some neutron detectors in Oct 2005. Because of this, the CFD thresholds of ALL detector segments were increased by a factor of about 3.5.

2) Post expt Johan discovered an error in the Neutron Wall trigger timing. One of the signals had not enough delay, which lowered the neutron efficiency for events when a neutron was required to produce the fast trigger for EXOGAM.