Research Plan at RIKEN CC-J 
				          Date: 22/11/08 (DD/MM/YY)

To: the Planning and Coordination Office of RIKEN CC-J

Reseach Subject : Muon trigger upgrade

(PHENIX official or not :      official )

Person responsible for this reserch:
Name : Yoshinori Fukao
Tel/Fax : 3265/3270
E-mail : fukao@riken.jp

Person responsible for the job submission:
Name : Katsuro Nakamura
Tel/Fax : 
E-mail : katsuro@scphys.kyoto-u.ac.jp


Other collabrators in this research subject:
Name : Ken'ichi Karatsu
Tel/Fax: 3265/3270
E-mai: karatsu@scphys.kyoto-u.ac.jp
  

Summary of this research (10-100 lines)

We research the spin structure function in nucleon on polarized proton-proton collision experiment at BNL.
We're going to lead this structure with the measurement of W boson cross section asymmetry
between helicity+ proton collision with non-polarized proton and helicity- proton collision,
and the detection of W boson is performed with the detection of high momentum muon from W.
For the back-ground rate and our DAQ band width,
new level-1 trigger system for this measurement on the current muon tracking chamber is needed.
This trigger selects only high momentum muon events, then it promotes the purity of W boson event.

Due to large W boson mass, this measurement is performed with the collision in 500 GeV of center-of-mass,
the collision of this energy is planed in this fiscal year's run. 

Then I now study back-ground effect to the performance of our trigger system.
I have to compare the expected rejection factor value of our trigger algorithm with actual value before this 500 GeV run,
and if there are any differences, then I should understand the reasons.
I also concern about degradation of rejection ability of our muon trigger due to non-random back-ground,
for example back-ground hits caused by knock up particles from beam-pipe.
For this study, I'll check the rejection factor and the efficiency of our trigger algorithm
for the actual run data(in PRDF files).
This PRDF file is very large and I have to analyze several PRDF files for this study,
so I need adequate data space for this work.

Estimated CPU time required : 6000 hours (with Pentium III 1GHz)
  
Estimated disk space usage required : 500 GB
 
Estimated HPSS space usage required : 50 GB

HPSS band width for above estimate  :   10 MB/s


Target date for completion (cpu) : 31/ 3/10 (DD/MM/YY)
                           (disk): 31/ 3/10


Plan for the publication of this result (if possible)
 no

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