Timing Scan 11/23/2007

EEMC timing scan was taken on11/23/2007.

To generate the curves, log into your favorite rcas node and

$ cvs co -D 11/27/2007 StRoot/StEEmcPool/StEEmcTimingMaker

and follow the instructions in the HOWTO

$ cat StRoot/StEEmcPool/StEEmcTimingMaker/HOWTO.l2ped

(tried to post code, but drupal wouldn't accept it...)

Will's notes on crate configuration:

FYI here are some (old) notes on how I set up config files
for EEMC tower timing scans that were taken a few days back (BTW,
these configs are still loaded).

1) Old running settings -- config files are on eemc-sc in directory
/home/online/mini/tcl with symbolic links:
tower-"n"-current_beam_config.dat ->
dir/tower-"n"-current_beam_config.dat
We had (I believe) been using directory 04.04.07 for the run with
ETOW TCD phase of 19; crate fifo (RHIC tic) 0x13. Those crate delay
settings are:
1 -> 0x12; 2 -> 0x8; 3 -> 0x56; 4 -> 0x50; 5 -> 0x2b; 6 -> 0x1f

2) new scan settings ... for time scans using only TCD phase
we usually create special config files with approprieate box delay and
TCD values.

nominal (ns) for (eff RHIC tic
run 7 scan ns)

1 -> 0x12 (18) 0x5a (-17) fifo 0x14 (e.g., 107-90)
2 -> 0x8 ( 8) 0x50 (-27) fifo 0x14 (e.g., 107-80)
3 -> 0x56 (86) 0x42 ( 66) fifo 0x13
4 -> 0x50 (80) 0x3c ( 60) fifo 0x13
5 -> 0x2b (43) 0x17 ( 23) fifo 0x13
6 -> 0x1f (31) 0xb ( 11) fifo 0x13

Here we have shifted crates "earlier" in time: 1&2 by 35 ns and
rest by 20 ns.Starting TCD scan at 5 then should start things
~ 34 (49) ns earlier than nominal with ~ 70 ns for scan to run
(suggested TCD: 5,10,15,25,35,45,55,65,75,70,60,50,40,30,20,10)

Run
ETOW tcd phase delay
N events

8327013	5	136k
8327014	15	20k
8327015	25	20k
8327016	35	20k
8327017	45	20k
8327018	55	20k
8327019	65	20k
8327020	75	20k
8327021	70	20k
8327022	60	20k
8327023	50	20k
8327024	40	20k
8327025	30	20k
8327026	20	20k
8327027	10	20k

Figure 1 --Integral from ped+25 to ped+75, normalized to total number of events, versus TCD phase delay.

Channel-by-channel plots are attached below.