To resolve a general misconseption. Yes, it is true that 60 cm vertex
goes from +/- 30 cm and in fact we see that. However, we CANNOT use
extra 20 cm at the edges due to a target field change of sign. So we
still work with a target of +/- 20 cm. The only gain is due to a
conductace change which is linear with the length and thus should go up
by a factor of 60/40=3/2 which is what, I think, we see. I would like
elastic people :-) verify what I see.
Cheers, Vitaliy
Manouch Farkhondeh wrote:
>Vitaly:
>
>Why is that the vertex reconstructed for 60 cm (red) goes to 0 near
>+/-20 cm? instead of +/-30 cm, and is very much similar to the 40 cm
>target? I thought this morning in the counting bay I saw the on line Z-
>distribution vanishing at +/-30.
>Manouchehr
>
>vitaliy ziskin wrote:
>
>
>>I include the vertex reconstructed for 60 cm cell (red) and 40 cm cell
>>(black) normalized to charge. I seems that we are only gaining 25% not
>>a factor of 2. What has changed? Are the cerenkov efficiecies still
>>the same? Should we adjust the nozzle to maximize the gas flow into the
>>cell? Is the reconstruction efficiency the same?
>>
>> Cheers,
>>Vitaliy
>>
>> ------------------------------------------------------------------------
>> [Image]
>>
>>
>
>
>
This archive was generated by hypermail 2.1.2 : Mon Feb 24 2014 - 14:07:31 EST