Star-tpc-l mailing list

[videbaek <videbaek AT bnl.gov>]

Hi All,


Tonko send out an e-mail yesterday requesting that for the HI running in 
23 and 25 it is considered to change the trheshold for the TPC ascii's , 
in particular the ALTRO to 4 in order to reduce the data volume that is 
the limiting factor to achieve
the 4.5-5kHaz rate for Min Bias that is needed to get to the physics 
goals for these last runs.

At this point it is not the only limitations but is one of those.
seem to be found that for run 16
I looked back at some earlier information, in Irakli's blogs, and it 
seem to be found that for run 16-18
using threshold =4 was desirable (for tracking).
I also recall that from Yuri's presentations over the years that th=4 
causes a worse resolution for de/dxIs this correct and by how much.

It would be useful to understand what the physics goal requirements are 
for dE/dx.

We should have a discussion in the TPC group on this, but do also need 
input from PWG/ mgt what the requirements are

best regards
Flemming





--
Flemming Videbaek
senior scientist, emeritus
videbaek @ bnl.gov
Brookhaven National Lab
Physics Department
Bldg 510D
Upton, NY 11973

phone: 631-344-4106
cell     :  631-681-1596