Tpc drift velocity versus electric field
I am trying to match our Tpc drift velocity with Magboltz calculation. I see some contrudiction.
For Run XIII we see drift velocity 5.51 cm/us. Magboltz gives 5.5456 cm/us @ E = 133.37 V/cm
To check the drift velocity dependence on electric field I have recalculated laser drift velocity for
+--------------------+-------------+--------------+
| beginTime | cathode | gatedGridRef | run E(V/cm)
+--------------------+-------------+--------------+
| 2004-01-12 14:26:44 | -27.95000076 | -115.00000000 | 5012033 133.37
| 2004-01-12 14:33:07 | -27.95000076 | -115.00000000 | 5012034 -"-
| 2004-01-12 14:46:24 | -30.95000076 | -127.00000000 | 5012035 147.68
| 2004-01-12 14:50:29 | -30.95000076 | -127.00000000 | 5012036 -"-
| 2004-01-12 15:02:23 | -24.95000076 | -103.00000000 | 5012037 119.05
| 2004-01-12 15:06:34 | -24.95000076 | -103.00000000 | 5012038 -"-
| 2004-01-12 18:33:34 | -27.95000076 | -115.00000000 | 5012142 133.37
and put all of them on the same plot
The conclusions from these plots:
1. Run IV drift velocities is much close to Magboltz than Run XIII ones.
2. Maximum in measured and calculated drift velocity are shifted.
3. I have suspicion that CH4 content in Run XIII "P10" significantly low 10%
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