1. Status report
Minjung Kim

2. Calibration
SMD/ZDC calibration parameters: I had used calibration parameters from database (pedestal: “ZdcCalib.pedestal.Fri_Feb_1_00:00:00_2013-Wed_Jan_1_00:00:00_2020”, gain: “ZdcCalib.adc.Fri_Feb_1_00:00:00_2013- Wed_Jan_1_00:00:00_2020”)
Seems not correct : pedestal not match with data & DB parameters, energy distribution peak (x_F~0.8) is lower than it should be)
Compared pedestal value got from several ways.
From DB
From LED run (various fitting ranges)
From Physics run

3. Pedestal calibration with LED run
-X-axis: ZDC ADC digital sum (sum of 3 ZDC module’s ADC)
-Y-axis: each ZDC ADC, or SMD ADC
(ADC value: average)
-Fit “[0]*x+[1]” -> [1]: pedestal
-but not linear in some channels
(All channel results are in backup slide)

4. Pedestal calibration with physics data
Get constants from ADC distribution of physics run data
ZDC:
Fit “gaus”
(SetRange(peak bin-5, peak bin+5);
SetParameters(peak bin entry, peak bin, 1.);)
->pedestal: Mean
SMD:
Events with zdc adc 550~1000 ( to avoid strange SMD peak)
Fit “Landau” (fit thicker right tail better than gaus)
(SetRange: peak bin-50, peak bin+50)
SetParameters(peak bin-1, peak bin, 6.0) )
->pedestal: MPV
SMD peak which is not pedestal

5. Colors in fit result
Red: fitting results with physics run (385985, transverse run)
Green: LED run with fit range 250 ~ 2250, or 250 ~3000 (range in calibration macro
zdc/calibrations/adcgain.cc?view=markup )
Blue: LED run with fit range 550 ~ 1000
Yellow: DataBase (old, taken at 2011, SMD board replacement at 2012)
-> For SMD, red & yellow values are very close except some channels

6. ZDC pedestal fit

7. ZDC pedestal fit -zoom

8. SMD ch 0~7

9. SMD ch 0~7 zoom

10. SMD ch 8~15

11. SMD ch 8~15 zoom

12. SMD ch 16~23

13. SMD ch 16~23 zoom
Red bar is almost in the yellow bar’s position(see the table in the first back up slide)

14. SMD ch 24~31

15. SMD ch 24~31 zoom

16. ZDC gain constant
ZDC ADC distribution after < neutron ID && r<1cm (=p_T <0.11*x_F GeV/c) > cut.
Cuts about SMD, (position, # scintillators, badsmd): used SMD results with calibrated by DB parameters.
Peak: x_F~0.8 -> peak ADC should be 204 GeV
Peak ADC: got peak bin’s middle value
Gain=204/ (peak ADC - pedestal)
But, those are tentative gain. The reason for doing ZDC calibration is to see if ZDC’s ADC range for SMD calibration is containing energy range for analysis)
Max ADC for analysis (300GeV) = (300/204) * (peak ADC –pedestal) + ped
->Max ADC shift: peak shifted* 1.5

17. Result north south south north Pedestal ADC value 467.2 438.6
Peak ADC value
690
750
Gain
550 ADC in GeV (ene min)
79.4 GeV
75.4 GeV
300 GeV in ADC (ene max)
780.1
881.8

18. Results & things to do
SMD pedestal, ZDC pedestal, ZDC gain -> going to use physics run fitting data
Should think about how to get SMD gain

19. backup

20. Parameters of each method
physics run DB
LED (250~2250)
LED (250~3000)
LED (550~1000)
channel
pedestal
err
ZDC 0
467.2
1.4
430
1.2
425.8
1.06
429.7
0.88
413.1
4.85
ZDC 1
430.5
1.5
397
368.4
0.95
369.2
0.81
361.3
4.55
ZDC 2
394
1.6
396
393.5
0.89
397.2
0.75
372.3
4.37
ZDC 3
464.7
456
435
0.84
437
0.71
421.7 4
ZDC 4
438.6
1.7
417
407.4
0.91
407.2
0.76
398.4
4.23
ZDC 5
436.2
386
1.3
368
0.9
366.7
366.9
4.06
ZDC 6
444.5 2
431
410.5
0.87
413.2
0.72
414.5
3.84
ZDC 7
425.7
429
409.5
0.94
414.4
0.77
417.1
4.31
SMD 0
447.3
5.6
449.3
6.6
450.2
3.63
448.9
2.96
426.6
18.22
SMD 1
661.7
5.9
664.9
7.7
659.2
3.82
663.2
3.05
712.9
21.37
SMD 2
517.9
5.8
519.9
6.8
417.8
3.67
429.1
2.99
22.73
SMD 3
707.4
5.7
712.1
7.1
687.6
3.73
705.7
666.1
20.92
SMD 4
695.6 6
691
731
3.27
722.7
2.66
952.9
16.18
SMD 5
434.6
432.8
6.4
388.6
3.29
402.1
2.68
156.4
16.62
SMD 6
655.8
658
6.3
650.1
3.11
663.3
2.5
674.4
15.48
SMD 7
673.6
682.9
676.5
3.18
689.4
2.53
768.4
17.22
SMD 8
430.2
6.1
429.4
6.9
434.4
3.57
425.2
2.86
397.9
17.37
SMD 9
568.8
5.5
567.3
6.7
582.1
565.5
2.3
577.6
15.51
SMD 10
499.7
500
6.5
496.2
3.34
468.1
2.79
500.7
19.66
SMD 11
695.9
697.8
7.5
641.4
3.71
666.8
2.95
677.8
22.53
SMD 12
562.8
5.3
564.3
566.8
3.36
588.2
2.77
562.4
19.19
SMD 13
578.2
576.9
558.9
3.28
492.1
2.6
521
16.3
SMD 14
722.5
721.1
7.2
714
3.3
752.1
2.63
758.8
17.76
SMD 15
614.5
13.2
608.4
6.2
602.8
4.18
646
3.35
569.4
21.57
SMD 16
716.5
761 10
777.6
1.86
776.2
1.68
623.3
15.24
SMD 17
517.1
517.4
464.3
2.21
667.2
1.85
495.9
14.76
SMD 18
856.5
856.3
7.4
713.4
773.8
1.45
844.4
13.54
SMD 19
820
769 8
542
1.8
671.5
1.51
684.6
16.32
SMD 20
727.6
728
626.6
1.67
644.9
1.52
476.8
16.8
SMD 21
789.5
794
700.9
1.71
762.3
1.43
804.5
15.93
SMD 22
792.3
793.3
8.6
580.1
1.55
1.32
687.9
15.5
SMD 23
848.3
848.6
610.8
1.54
698.5
693.9
15.73
SMD 24
530.3
523.5
554.6
2.12
552.1
1.88
486.3
15.19
SMD 25
573.9
569.9
655.1
1.65
644.5
1.46
633
14.08
SMD 26
676.7
674.1
646.8
2.28
1.93
627.4
15.1
SMD 27
640
637.6 7
2.19
606.9
557.4
15.7
SMD 28
427
5.1
639.3
1.61
612.4
422
16.6
SMD 29
748.3
744
7.3
558.2
1.56
638.2
1.31
666.6
14.26
SMD 30
773.5
770.3 5
601.2
666.5
657.1
14.95
SMD 31
716
13.1
705.2
574.1
653.7
578.5
15.49

21. ZDC energy distribution with DB calibration parameters
-x axis: GeV
-Should have peak around 200 GeV (r<1 cm), bu t smaller in north
-But asymmetry will not change with same ZDC ADC cut-> ZDC calibration can be done later.

22. Neutron ID && r<1 cm Cut
i=0 for south, 4 for north
cond <<"trigscaled==8 && "
<<"trigscaled_lpol==1 && "
<<"spin>=0 && spin<=3 && "
<<"zdc_time["<<4*i<<"] >-100 && "
<<"badsmd["<<i<<"]==0 && "
<<"wxpos["<<i<<"]>=2 && wypos["<<i<<"]>=2 && "
<<"(xpos["<<i<<"] - ("<<x0<<"))*(xpos["<<i<<"] - ("<<x0<<")) + (ypos["<<i<<"] - ("<<y0<<"))*(ypos["<<i<<"] - ("<<y0<<")) <1.0";

23. ZDC results - LED

24. SMD results (1) -LED
Not linear.

25. SMD results (2) -LED
Not linear.

26. SMD results (3) -LED
Not linear.

27. SMD results (4) -LED
Not linear.

28. SMD Gain constant
SMD gain: relative gain (cannot gives absolute energy)
->so relative gain is enough
Changed into log scale (y axis is not log scale
Because I applied log function to each bin content, then fill histogram)
Tried linear fit
Hit position is calculated as
n: # of SMD strip having hit

29. SMD Gain linear fit (1)

30. SMD Gain linear fit (2)

31. SMD Gain linear fit (3)

32. SMD Gain linear fit (4)

37. Summary for ZDC/SMD correlation
Manabu Togawa

38. Block diagram for SMD readout
Dinode readout *1
(sum)
Inverter
Anode read out *15
IP Area
(BB crate)
Tunnel Area
Each SMD signal is input to the SMD FEM directly from anode readout.
Sum is read from dinode via inverter.
Multi. CH PMT
(HAMAMATSU
H6568 M16)
Common gate making by ZDC sum.
See next page.

39. Making gate signals for SMD (ZDC sum signal is split by FIFO)
(LeCroy 428F)
LINEAR

40. The ZDC/SMD correlation
SMD pedestal and gain look changing in the specific ZDC ch arge input.
Worse the years (RUNs) (6p)
There is correlation among 4 channel. (7p)
1 group shared the gate signal.
Only at beam time (8-9p)
Can not reproduce by LED data

41. ZDC/SMD correlation
SMD pedestal and gain look changing in the sp ecific ZDC charge input.
Some channels Qscan result is also has bump.
Usual pedestal
Line (From Qscan result)
qscan result.