Log entry time 10:27:28 on November 22, 2008

Entry number 250310

Followups:

• 250313 11/22/08 11:10 xqian BigBite Gas Cerenkov Study II ----- ADC

We strongly suppress background level in both side of the Gas Cerenkov PMTs with the correlation cut (tracking). see Fig. 1 (after) and 2 (before).

However, the efficiency for electron TDC is small, (threshold too high?)

electron efficiency (after background subtraction)

PMT# signal track bg ratio

0 58 1370 12.5897 0.0331462

1 567 3591 32.1538 0.148941

2 253 3694 60.8974 0.0520039

3 222 5669 87.2308 0.023773

4 689 10412 249.077 0.0422515

5 432 9700 111.103 0.0330822

6 0 44622 0 0

7 205 7579 79.7436 0.0165268

8 595 44622 648.949 -0.00120902

9 198 1108 16.1538 0.164121

10 40 462 0.102564 0.0863581

11 308 2284 3.53846 0.133302

12 189 2820 4.38462 0.0654664

13 139 3499 1.74359 0.0392273

14 493 4786 12.5641 0.100384

15 850 5064 5.07692 0.166849

16 501 23918 419.436 0.00341016

17 170 3851 6.48718 0.0424598

18 7 23918 7.35897 -1.50085e-05

19 66 453 0.692308 0.144167

more strict cut for electron

0 21 685 5.30769 0.0229085

1 291 1930 15 0.143005

2 159 2288 30.641 0.056101

3 130 3204 43.4872 0.0270015

4 366 5650 117.974 0.0438983

5 206 5253 54.359 0.0288675

6 0 24953 0 0

7 148 4221 39.7949 0.025635

8 270 24953 328.179 -0.00233156

9 72 627 10.4103 0.0982293

10 19 213 0.025641 0.0890815

11 162 1157 1.58974 0.138643

12 129 1592 2.64103 0.0793712

13 92 1830 1.07692 0.0496847

14 376 2598 7.05128 0.142013

15 664 2663 2.66667 0.248341

16 178 12874 199.949 -0.00170489

17 156 1987 3.76923 0.0766134

18 4 12874 4.05128 -3.98338e-06

19 19 287 0.282051 0.0652193

The efficiency for pion is almost zero,

0 33 4384 36.0513 -0.000696004

1 66 10648 80.6923 -0.00137982

2 43 2488 44.359 -0.000546212

3 33 2288 35.6923 -0.00117671

4 81 3859 98.9744 -0.00465778

5 43 3643 41.1795 0.000499729

6 0 26210 0 0

7 34 2539 26.3077 0.00302966

8 276 26210 360.103 -0.0032088

9 2 180 1.66667 0.00185185

10 2 1358 0.358974 0.00120841

11 9 5108 2.69231 0.00123487

12 7 1637 1.94872 0.00308569

13 3 1395 0.461538 0.00181969

14 13 2035 7.02564 0.0029358

15 5 2277 1.53846 0.00152022

16 277 14566 285 -0.000549224

17 4 1615 2.89744 0.000682702

18 6 14566 4.07692 0.000132025

19 0 93 0.102564 -0.00110284

I attached the cut just in case if anybody is interested.

if (num<10){ qx = num; cut1.Form("BB.tr.y+0.18*BB.tr.ph>0."); }else{ qx = num-10; cut1.Form("BB.tr.y+0.18*BB.tr.ph<0."); } if (num==0){ cut2.Form("abs(BB.tr.x+0.18*BB.tr.th-%f)<%f",-0.71,0.05); }else if (num==1){ cut2.Form("abs(BB.tr.x+0.18*BB.tr.th-%f)<%f",-0.625,0.1); }else if (num==2){ cut2.Form("abs(BB.tr.x+0.18*BB.tr.th-%f)<%f",-0.44,0.11); }else if (num==3){ cut2.Form("abs(BB.tr.x+0.18*BB.tr.th-%f)<%f",-0.26,0.11); }else if (num==4){ cut2.Form("abs(BB.tr.x+0.18*BB.tr.th-%f)<%f",-0.075,0.125); }else if (num==5){ cut2.Form("abs(BB.tr.x+0.18*BB.tr.th-%f)<%f",0.125,0.11); }else if (num==6){ cut2.Form("abs(BB.tr.x+0.18*BB.tr.th-%f)<%f",0.,1.); }else if (num==7){ cut2.Form("abs(BB.tr.x+0.18*BB.tr.th-%f)<%f",0.46,0.11); }else if (num==8){ cut2.Form("abs(BB.tr.x+0.18*BB.tr.th-%f)<%f",0.,1.); }else if (num==9){ cut2.Form("abs(BB.tr.x+0.18*BB.tr.th-%f)<%f",0.76,0.08); }else if (num==10){ cut2.Form("abs(BB.tr.x+0.18*BB.tr.th-%f)<%f",-0.76,0.1); }else if (num==11){ cut2.Form("abs(BB.tr.x+0.18*BB.tr.th-%f)<%f",-0.6,0.11); }else if (num==12){ cut2.Form("abs(BB.tr.x+0.18*BB.tr.th-%f)<%f",-0.43,0.11); }else if (num==13){ cut2.Form("abs(BB.tr.x+0.18*BB.tr.th-%f)<%f",-0.25,0.1); }else if (num==14){ cut2.Form("abs(BB.tr.x+0.18*BB.tr.th-%f)<%f",-0.07,0.11); }else if (num==15){ cut2.Form("abs(BB.tr.x+0.18*BB.tr.th-%f)<%f",0.1,0.11); }else if (num==16){ cut2.Form("abs(BB.tr.x+0.18*BB.tr.th-%f)<%f",0.0,1.0); }else if (num==17){ cut2.Form("abs(BB.tr.x+0.18*BB.tr.th-%f)<%f",0.45,0.11); }else if (num==18){ cut2.Form("abs(BB.tr.x+0.18*BB.tr.th-%f)<%f",0.,1.0); }else if (num==19){ cut2.Form("abs(BB.tr.x+0.18*BB.tr.th-%f)<%f",0.76,0.08); }

if (num==0){ temp.Form("abs(DL.BBcerT1-1625.000000)<25"); }else if (num==1){ temp.Form("abs(DL.BBcerT2-1625.000000)<25"); }else if (num==2){ temp.Form("abs(DL.BBcerT3-1629.000000)<25"); }else if (num==3){ temp.Form("abs(DL.BBcerT4-1634.000000)<25"); }else if (num==4){ temp.Form("abs(DL.BBcerT5-1641.000000)<25"); }else if (num==5){ temp.Form("abs(DL.BBcerT6-1632.000000)<25"); }else if (num==6){ temp.Form("abs(DL.BBcerT7-1632.000000)<25"); }else if (num==7){ temp.Form("abs(DL.BBcerT8-1634.000000)<25"); }else if (num==8){ temp.Form("abs(DL.BBcerT9-1642.000000)<25"); }else if (num==9){ temp.Form("abs(DL.BBcerT10-1635.000000)<25"); }else if (num==10){ temp.Form("abs(DL.BBcerT11-1630.000000)<25"); }else if (num==11){ temp.Form("abs(DL.BBcerT12-1640.000000)<25"); }else if (num==12){ temp.Form("abs(DL.BBcerT13-1636.000000)<25"); }else if (num==13){ temp.Form("abs(DL.BBcerT14-1635.000000)<25"); }else if (num==14){ temp.Form("abs(DL.BBcerT15-1635.000000)<25"); }else if (num==15){ temp.Form("abs(DL.BBcerT16-1635.000000)<25"); }else if (num==16){ temp.Form("abs(DL.BBcerT17-1635.000000)<25"); }else if (num==17){ temp.Form("abs(DL.BBcerT18-1628.000000)<25"); }else if (num==18){ temp.Form("abs(DL.BBcerT19-1628.000000)<25"); }else if (num==19){ temp.Form("abs(DL.BBcerT20-1645.000000)<25"); }

cut3 = "!DL.edtpl&&(DL.evtypebits&1<<1||DL.evtypebits&1<<6||DL.evtypebits&1<<5)&&BB.ts.ps.e>500&&"+cut1+"&&"+cut2 + "&&" + temp;

A copy of this log entry has been emailed to: jpchen@jlab.org,jiang@jlab.org,brads@jlab.org,meziani@jlab.org,gen@jlab.org

Figure 1

Figure 2