From: Xin Dong (dongx_at_rcf.rhic.bnl.gov)
Date: Mon Apr 28 2003 - 08:09:28 EDT
Hello, All
Sorry!
In the former localmon plots 4116060_xxx.ps, the cell numbers are just
reversed as they should be. Actually, the sequence of them was just as
the DAQ channels. So the questioned Module 9 channel 2 is actually for
mod 9 cell 5, not as the former title showed.
/xin
> Yes,That's true.Thanks/Lijuan
>> Lijuan, see my previous email: most likely mod9-2 (assuming your "31"
>> corresponds with the 83rd TDC ...) experiences discriminator problems
>> either at the platform or on its FEE. If you look carefully your plots
>> below already indicate that this problem was around in 4111062:
>> compared
>> to the other TDC distributions you see at little bit too many (very)
>> late "hits".
>>
>> cheers,
>> frank
>>
>>
>>
>>
>>
>> Lijuan Ruan wrote:
>>> Hi,Frank
>>> Yes,The strobe events corresponding to TDC channel 1000 or so.
>>> It's not overflow.But the tdc distribution is different from others
>>> from Xin's plot.I didn't see this from the tof trigger event 4111062.
>>> The plot is
>>> http://www.star.bnl.gov/protected/spectra/ruanlj/localmon/
>>> 4111062_TDC.ps
>>> in this ps file ,the TDCdis31 corresponding to module 9 cell 2.I
>>> don't see the low TDC range signal.
>>>
>>> Lijuan
>>>
>>>
>>>
>>>> ok guys ... that was funny, but seriously: i just checked and
>>>> there
>>>>are NO overflows. Strobed events show up at channel ~1000 like they
>>>> always do (for the dAu run at least). This was the first time that
>>>> you guys looked at the raw tof spectra, right ;)
>>>>
>>>>-frank
>>>>
>>>>
>>>>
>>>>
>>>>Frank Geurts wrote:
>>>>
>>>>>wait a minute ... you're probably looking at the strobed events :)
>>>>> those have been there from day-one. with everybody having his/her
>>>>> own localmon decoding program it is hard to tell whether Xin
>>>>>included/excluded those in his.
>>>>>
>>>>>-frank
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>Geary Eppley wrote:
>>>>>
>>>>>
>>>>>>Hi experts,
>>>>>>
>>>>>>Xin showed me the TOFr TDC distributions for last night. All the
>>>>>> overflows
>>>>>>appear to be in channel 1000 (1024?) and not 2000. But there are
>>>>>> hits
>>>>>> past
>>>>>>1000. ?
>>>>>>What do you think could account for the distribution in mod 9-
>>>>>> channel 2?
>>>>>>
>>>>>>Geary
This archive was generated by hypermail 2.1.4 : Thu Jul 24 2003 - 00:39:41 EDT