From: W.J. Llope (llope_at_physics.rice.edu)
Date: Mon Apr 21 2003 - 19:04:57 EDT
it is trivial - geary can show you i'm sure...
On Mon, 21 Apr 2003, Xu, Zhangbu wrote:
> 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
>
--
_________________________________________________________
W.J. Llope, Ph.D. Res. Assoc. Professor
http://wjllope.rice.edu/default.html
llope_at_physics.rice.edu
T.W. Bonner Nuclear Lab.
Rice University, MS-315
6100 S. Main phone: 713-348-4741
Houston, TX 77005-1892 fax: 713-348-5215
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