1. status of TPC experiment
4/28/2019
status of TPC experiment
CH2 (V,H) (4.5, 5.7 M events)
C (V,H) (3.6, 3.8 M)
Cu (V,H) (1.4, 1.4 M)
in this cycle
Data storage (3.1TB) on saho is full!
→ share data with AS (closer communication!)
DC efficiency is low
Inactive area of DC around beam axis
SC time resolution is bad ~400ps
→use Tagger for RF, new SC will be installed
in this weekend
AC efficiency ~96% → change the magnetic shield
6/24~7/13 next beam time
4/28/2019
TPC meeting

2. Inactive area of DC1 around beam axis
LH2
TPC
hole
4/28/2019
TPC meeting

3. DC efficiency DC1X 98-99% DC1U wire position dependence
run , 10runs
DC1X 98-99%
DC1U wire position dependence
DC2,DC %
cut condition
ntof = 1, ntrk = 1
abs(pm( )<0.5
-1600<vtz<-1400
4/28/2019
TPC meeting

4. Width of DC TDC ? ?
4/28/2019
TPC meeting

5. Start counter time resolution
4/28/2019
Start counter time resolution
special set-up
target
after slewing corr SC
sta_sqr
10cm β
0.8<β<1.0
σ= 370pS
not enough
to solve RF
4/28/2019
TPC meeting

6. solve RF use new param. from slewing corr. run
make rf param. by selecting high mom. particles
Use STA to solve RF/ Use wrong-RF to solve RF
4/28/2019
TPC meeting

7. Use SC to solve RF
strange β
sta_sqr β
TOF corr.
4/28/2019
TPC meeting

8. Use SC to solve RF -1600<vtz<-1400 still there are miss-ID
4/28/2019
TPC meeting

9. Use wrong-RF to solve RFβ β
4/28/2019
TPC meeting

10. Use wrong-RF to solve RF
-1600<vtz<-1400
still there are miss-ID
4/28/2019
TPC meeting

11. Another approach to solve RF
Use tagger σ~250pS is expected
→ input into HRTDC
new variable hrTagPL(7) in
/np1b/v01/niiyama/tmp/lepsanaTPC/bin4/r2951*.nt
multiplicity of hit looks significant.
They indicate same RF?
save several RF candidate and mass
in LEPSana, try to select correct one
by TPC scintillators or kinematical
constraint
4/28/2019
TPC meeting

12. runge-kutta tracking Field map has been included.
Minuit spends many iteration >100
What should we check?
comparison with circle fit
chi2 and # of iteration
correlation of residual on various param.
please give me advice
4/28/2019
TPC meeting