From: Xu, Zhangbu (xzb_at_bnl.gov)
Date: Mon Apr 21 2003 - 18:50:49 EDT
Hi,
Can someone tell me (send me manual) about how to use the HP
8110a pulse generator?
I would like to calibrate the TDC this Wednesday to make sure
whether it is TDC nonlinearity or other effects.
Thanks!
Zhangbu
-----Original Message-----
From: Frank Geurts
To: John Mitchell
Cc: Xu, Zhangbu; 'tofp_at_physics.rice.edu '
Sent: 2003-4-21 16:44
Subject: 2228a nonlinearity ...
Hi John --
Is there a way that you can get easily hold of some of the calib. data
used for plot 1a in your NIM paper. The question, essentially, is how
much the non-linearity really is below ch#300. From the plot the
(xerox-convoluted) non-linearity appears to be around 3% (5-6 channels)
at 200 but almost 28% (or channels) at TDC=100. Zhangbu sees a lot of
tdc signals in the lower regions which would make them more sensitive to
these non-linearities.
To rule out software issues, Zhangbu suggested a quick & dirty
calibration of the (suspect) modules on our next 12hr access on
Wednesday. Ideally, I suppose he could change the width of the LC622
(2-9-2), measure the relative change in width and do quick measurements
on all TDC modules in dedicated pedestal runs.
However, this will leave the position on the pedestal (strobe event) on
a slightly different location than what we used to have it for during
the dAu run (which means offline analyses need to adjustment the strobe
event selections for dAu or pp).
John, Bill -- can you guys think of other options for a quick in-situ
calibration? Let's discuss this at tomorrow's TOF meeting (can you make
it, John?)
cheers,
-frank
This archive was generated by hypermail 2.1.4 : Thu Jul 24 2003 - 00:39:40 EDT