Log entry time 23:03:39 on March 25, 2008

Entry number 228816

keyword=Re: EDTM settings. ANOTHER correction.

We found that the TOF had been incorrectly using 4.3 meters, instead of the expected ~3.0 meters. So... here's starting from scratch.

In the Left Arm DAQ: 162ns Internal delay from the EDTM Master

To BigBite EDTM Slave from the backpanel of the EDTM Master: 16ns lemo cable 8ns FI/FO delay 3ns lemo cable 260ns RG58 cable 8ns lemo cable 140ns Internal delay of EDTM Slave ------ 435ns

Time Difference in EDTM pulses: B-L = 273

Consideration for particle TOF and signal times to that point at which each EDTM pulse is inserted:

e' in Left arm (~1GeV) ---------------------- 87ns TOF 60ns Signal Cable (From PMT) ----- 147ns

p in BigBite (~1GeV) -------------------- 14ns TOF (3.0m) 206ns Signal Cable (From PMT) 10ns Patch Panel to x10 Amp 1ns x10 Amp delay 8ns Lemo cable to discriminator ----- 239ns

Time difference: B-L = 92ns

To simulate this with EDTM... making sure to account for the 2.2ns timestep in the EDTM Slave: ./edtmsetup 273 42

For a 200 MeV proton (48ns TOF over 3.0m for a B-L = 126): ./edtmsetup 273 57

User name Moffit

Log entry time 23:03:39 on March 25, 2008

Entry number 228816