Re: TPC drift calibrations

From: Peter H. L. Christiansen (pchristi@nbi.dk)
Date: Wed Jan 22 2003 - 04:29:45 EST

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    Hi

I found a bug in my caliration code where I set the distance to the _T2_ 
fibers incorrect. Now I get consistent results :
v_T1 = 0.001792 cm/ns
v_T2 = 0.001816 cm/ns
but this is higher than what Ian wrote the DVMs gave :
T1: 1.59
T2: 1.62

Maybe someone could take a look at this with another run and T3.

Cheers
   Peter

P.s : I attached a matching plot for T1-T2 matching using the old geometry 
and the new drift velocities. It looks much better than before, but I 
am not sure how it compares to a correct plot;)

P.p.s : Updated the scripts in brat

On Mon, 20 Jan 2003, Peter H. L. Christiansen wrote:

> Hi
> 
> Added the scripts for TPC drift velocity calibrations of T1 and T2. I 
> calibrated run 7374 :
> v_T1 = 0.00179248 cm/ns
> v_T2 = 0.00161696 cm/ns
> I don't know how this compares to the DVM's.
> 
> I found that in the T2 fibres the order had been changed and modified the 
> calibration script to have this order. The calibrations looks good. Hope 
> that someone will check in the TPM1 and TPM2 part. 
> 
> Cheers
>    Peter 
> 
> 

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 Peter H L Christiansen @ NBI
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    matching.gif

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