User name J. Volmer
Log entry time 11:23:08 on November 15,1999
Entry number 344
This entry is a followup to: 336
keyword=electronic live time vs pretrigger rateDave was right. The electronic live time does correlate much better to the pretrigger rate than to the S1 rate, see Fig. 1. The top two plots show the HMS electronic live time vs hpre and run numbers, the bottom two plots do the same for the SOS.
The SOS one is easy. There is a constant linear dependence between electronic live time and pretrigger rate, whatever the circumstances. In the HMS, much more is going on. First of all, pi+ production (red and blue) yields lower dead times (higher live times) than pi- production (green and pink). Further, around run 17140, something must have happened to make a significant difference for pi+ production (blue vs red), and a small one for pi- production (green vs pink).
A few possibilities:
not very likely:
hclog #1932: sos camac crate
hclog #1939: camac crate 3 SOS
hclog #1943: summary of camac crate woes
hclog #1970: mail from Rolf: the meaning of death and the camac power supply
worth looking into:
hclog #2024: maintenance day activities: In this entry there is a reference to HMS wire chamber ringing. I couldn't find a follow-up in hclog. Maybe that's where it stopped?
FIGURE 1
