1. Weekly Report Maya SHIMOMURA Run dependent check for VTX alignment
12/04/23
RIKEN VTX Meeting

2. Check run dependent of Alignment.
Steps and status.
Find good runs and transfer PRDFF files from HPSS.
Produce DST form one PRDFF for each run, and measure the beam center.
Re-produce corresponding zero-field DST files with recent geometry file and geometry offsets.
Get new geometry offsets between CNT and DSTs.
Check the alignment of new run with new offsets.
Since we want to check the period after the central arm was moved, we need step 1 to 3.
We need to be done this check by production.
12/04/23
RIKEN VTX Meeting

3. Run 346977(zero-filed) beam center of VTX
west xoffset 1st e-05 cm
west yoffset 1st e-05 cm
west xoffset 2nd e-05 cm
west yoffset 2nd e-05 cm
west sigma of DCA cm
east xoffset 1st e-05 cm
east yoffset 1st e-05 cm
east xoffset 2nd e-05 cm
east yoffset 2nd e-05 cm
east sigma of DCA cm
Offsets are very small mostly less than 100 microns. This means the Central Arm position returned to the position which is very close to the original, since I used previous offsets to obtained these values.
--- I used “OffsetVtxToCnt :(-0.169,-0.122,0.) “
12/04/23
RIKEN VTX Meeting

4. DCA for WEST (Zero field ) run346977
12/04/23
RIKEN VTX Meeting

5. DCA for EAST (Zero field ) run346977
12/04/23
RIKEN VTX Meeting

6. DCA for EAST (Zero field ) run346977
There is some strange structures on DCA
12/04/23
RIKEN VTX Meeting

7. Run 347148(zero-filed) beam center of VTX
west xoffset 1st e-05 cm
west yoffset 1st e-05 cm
west xoffset 2nd e-05 cm
west yoffset 2nd e-05 cm
west sigma of DCA cm
east xoffset 1st e-05 cm
east yoffset 1st e-05 cm
east xoffset 2nd e-05 cm
east yoffset 2nd e-05 cm
east sigma of DCA cm
12/04/23
RIKEN VTX Meeting

8. WEST (run347148) DCA for WEST (Zero field ) DCA ϕ DCA DCA DCA ϕ ϕ
12/04/23 ϕ
RIKEN VTX Meeting ϕ

9. East (run347148) DCA for EAST (Zero field ) DCA ϕ DCA DCA DCA ϕ ϕ
12/04/23
RIKEN VTX Meeting

10. Run 347797 (zero-field) west xoffset 1st0.00929465 +- 1.55312e-05 cm
west yoffset 1st e-05 cm
west xoffset 2nd e-05 cm
west yoffset 2nd e-06 cm
west sigma of DCA cm
east xoffset 1st e-05 cm
east yoffset 1st e-05 cm
east xoffset 2nd e-05 cm
east yoffset 2nd e-05 cm
east sigma of DCA cm
12/04/23
RIKEN VTX Meeting

11. West (run347797) DCA for West (Zero field ) DCA DCA ϕ DCA DCA ϕ ϕ
12/04/23
RIKEN VTX Meeting

12. East (run347797) DCA for EAST (Zero field ) DCA ϕ DCA DCA DCA ϕ ϕ
12/04/23
RIKEN VTX Meeting

13. Run 349006 (zero-field) west xoffset 1st0.00152661 +- 2.04441e-05 cm
west yoffset 1st e-05 cm
west xoffset 2nd e-05 cm
west yoffset 2nd e-05 cm
west sigma of DCA cm
east xoffset 1st e-05 cm
east yoffset 1st e-05 cm
east xoffset 2nd e-05 cm
east yoffset 2nd e-05 cm
east sigma of DCA cm
12/04/23
RIKEN VTX Meeting

14. Peak position vs. ladder number
No significant differences are seen.
12/04/23
RIKEN VTX Meeting

15. Peak σ vs. ladder numbers
Systematically East and West are different.
12/04/23
RIKEN VTX Meeting

16. Summary
I checked run dependence for all periods after June 1st, before and after central arm was moved several times.
4 data sets are compared.
No significant difference are seen.
Ready for production.
The codes for QA histograms are also ready.
12/04/23
RIKEN VTX Meeting

17. Both run#349369 and run#349679 are in this period.
Zero field run
Zero field run ,
Zero field run ,
Zero field run , ,349007
Both run# and run# are in this period.
12/04/23
RIKEN VTX Meeting

18. Back Up
12/04/23
RIKEN VTX Meeting

19. Run (zero-field test)
west xoffset 1st e-05 cm
west yoffset 1st e-05 cm
west xoffset 2nd e-05 cm
west yoffset 2nd e-05 cm
east xoffset 1st e-05 cm
east yoffset 1st e-05 cm
east xoffset 2nd e e-05 cm
east yoffset 2nd e-05 cm
east sigma of DCA cm
12/04/23
RIKEN VTX Meeting

20. run347141 x- beam center :0.0562326 y- beam center :-0.0587112
12/04/23
RIKEN VTX Meeting

21. Summary of beam offset old(hidemitsu)
vtx_west dch_west vtx_east dch_east
(0.226,0.056) (0.048,-0.039) (0.093,0.076) (0.030,-0.036)
(0.227,0.071) (0.068,-0.044) (0.091,0.079) (0.084,-0.025)
(0.225,0.049) (0.035,-0.023) (0.087,0.064) (0.046,-0.020)
(0.220,0.069) (0.056,-0.044) (0.084,0.086) (0.029,-0.047)
(vtx-dch)west (vtx-dch)east dch(west-east)
(0.176,0.095) (0.063,0.112) (0.018,-0.003)
(0,159,0.115) (0.007,0.104) (-0.016,-0.019)
(0.190,0.072) (0,041,0.084) (-0.011,-0.003)
(0.164,0.113) (0.055,0.133) (0.027,0.003)
12/04/23
RIKEN VTX Meeting

22. Beam offset measured by DCH vs VTX
What I did ?
-I calculated…
Beam offset measured by VTX
Beam offset measured by DCH
Last week I reported the result of run346977
VTX Beam offset
WEST ( 0.226cm,0.056cm)
EAST ( 0.093cm,0.076cm)
DCH Beam offset
WEST (0.048cm,-0.039cm)
EAST (0.030cm,-0.036cm)
Should we move VTX coordinate ?
Before that, I will check another zero field run .
“(VTX Beam offset )–(DCH Beam offset) is stable ?”
Zero filed run list
Jun 1 ………. VTX 4th repair
Jun :50 zero-field run (346977)
Jun :45 zero-field run (347148,347149)
Jun :20 zero-field run (347796, )
Jun :00 zero-field run (349005, , )
Jun :00 end of 200GeV Au+Au
12/04/23
RIKEN VTX Meeting

23. Beam offset measured by DCH
Thanks to Ciprian and Okada-san 　α
R: average radius of the DCH
R= 224cm
(dx,dy) : beam offset
>Plot α　vs　φ
>Fit with [0]*sin(φ)+[1]*cos(φ)
Where
[0] = dx/R,[1]= -dy/R
[0] = dx/R, [1]= dy/R
ref : AN923
12/04/23
RIKEN VTX Meeting

24. DCH analysis Date: (June 7th) --Cut-- -10 < BBC <200
-Track quality 63 or 31
63:(PC1 found unique hit, UV found unique hit, x1 and x2 used)
31:(PC1 found ambiguous hits , UV found with one best choice, x1 and x2 used)
West
-0.012<emcdphi<0.008 rad
-8cm<emcdz<5cm
ecore >0.3GeV
|pc3dphi| < 0.03 rad
EAST
-0.007<emcdphi<0.010 rad
-9cm < emcdz < 3cm
12/04/23
RIKEN VTX Meeting

25. How to calculate the beam offsetX Y
Beam center
(xoffset,yoffset)
(x0,y0) hit at L0 (pixel)
(x1,y1) hit at L1 (pixel)
φb:angle of track in XY -plane
DCA = yoffset*cosφb - xoffset*sinφb
fit function
vtxy: intersection point at x=0) L0 L1
DCA from (0,0)
(This is calculated in VTX internal coordinate)
12/04/23
RIKEN VTX Meeting