Results of RS bulk trimming
Special runs
Special set of runs were taken
before trim on Sep 14, 2001 and
after trim on Sep 21, 2001.
Software and results location
Currently all the software is located in
~e949/tr2/rstime/kofia3/rs_trim
(Directory tree can be viewed from any bnlkuXX machines only)
Step B. Pulser TDC calibration
Pulser study showed that TDC calibration did not changed befween data taking
before trim and
after trim
( PS )
Only channel 68 cahnged, which might be due to the fact that it
looked weird in before trim data. Also data sets extra and
after agree with each other qite well.
PS
This plots also shows that single hit measurement resolution is
about 0.75 ns, which is slightly bigger than 2ns/sqrt(12)=0.58, but
close enough.
Two measurements agree with each other to astonishing
precision of 0.068 ns, which is close to theoretically possible
limit of 0.75/sqrt(400)=0.37 for about 400 events in each measurement
point (before_trim had 10000 and after_trim had 400 pulses per point).
So ideally one would hope that 2 results can be reproduced with
less than 0.1ns resolution. But of course in kbeam measurements there
are many more factors that degrade resolution, as compared to simple
pulser setup.
Step C. MT2 arrival time in Range Card
MT2 signals
before trim and
after trim
have about the same spread. Though signals after trim seems to arrive
a little closer to each other.
( PS )
It seems that three channels have 1ns difference with their values
before trim.
Step X.
Quick summary of result is here
( PS )
Notation:
Black before trim
Red after trim
Blue expected after trim
Step D.
Quick summary of result is here
( PS )
Notation:
Black before trim
Red after trim
Blue expected after trim
.... Under construnction ....
Sasha Kushnirenko
Last modified: Wed Oct 3 22:29:32 EDT 2001