Djamel, Thanks. It is strange that the calibration changes like this. This may be completely off-mark, but I once encountered something similar to this where the problem was eventually traced back to the building air-conditioning turning on and off. With standard RG58 cabling the signal propagation speed has a fairly large temperature dependence. However, in this case I would expect to see a diurnal dependence. ...steve Djamel Ouerdane wrote: >On Wed, 24 Oct 2001, Stephen J. Sanders wrote: > >>Hi Djamel, >>Nice figures. A question, however: If I download the latest brag and >>use it with the >>run 5326 calibration, does your last figure indicate that I will have to >>apply an >>additional offset of 18.07 cm to get the correct BB vertex? >> >>...steve >> > >Hi Steve, > >yes, you're absolutely right. In fact, there will be soon a vertex >calibration package inserting offsets in the database for BB ZDC and so >on. I realized (and Flemming wonders about it) that this offset >fluctuates. It needs some calibration every week at least. It's on its >way... > >Note that you have to be aware that this offset only applies for the small >tubes. But the efficiency in the small tube vertex finding is very >good (around 0.97 in the sample I've scanned BEFORE requiring MRS tracks). > >Ciao >Djam >
This archive was generated by hypermail 2b30 : Wed Oct 24 2001 - 15:15:06 EDT