???????????? ?????????????? ??????? ??????? ??????????? LCHb ? ????????? ??????? ??????????? CBM

1
???????????? ?????????????? ??????? ???????
??????????? LCHb ? ????????? ??????? ???????????
CBM

• ?????? ????????, ???? ???????? ????

2
??????????

• ?????????
• ????????? ???????
• ????? ????????????????? ?????????
• ????????? ?????????
• ?????????? ????????? ? ??????????? ? ???????
• ????????? ? ???????????? ?????????????
• ??????????

3
?????????

• ??????????????
• ?????????? ??????? ?????????
• ?????????? ???????? ???? ?????????????
• ?????????? ??????? ???????
• ??????? ?????????? ??????
• ?????????? ??????? ?????????????
• ??????????????
• ??????????
• ?????????? ??????? ?????????????
• ??????????
• ???? ?????-????? 7k
• ????????????? ????????? ?????????? ? ????????

• ?????????? ??????
• ???????
• ???????
• ???????
• ???. ?????????
• ????????????????
• ??????????
• a - ?????????????? ???? 8/sqrt(E)
• b - ?????????? ????

RD36 data
7
4
????????? ???????

• ?????? ?????? 4?4??2
• LHCb
• 67 ????? ????????????? ???????? 4??
• 66 ????? ?????? ???????? 2??
• ???????? CBM
• 280 ????? ????????????? ???????? 0.5??
• 280 ????? ?????? ???????? 0.5??

5
????????????????? ?????????
????????? ??????
?????
????????
e, µ
25.111m
10.97m
2.935
????? ?????????? ???????
????????????????? ??????
LED2
8 ??????? (12x12cm2x1) ??? ????????? ??????
???????
PIN
LED1
?????????? ??????
6
?????. ?????????

• ??????? ?????? ? ??????????? ??????
• 1x1??2 ??????????
• ??? ?????????????? ??????
• ?????? ??? ?????????
• ?????? ? ????????
• f(xstart)0.4Max
• f(xend)0.05Max

7
?????????. ?????????

• ??????? ? 3x34 ???????
• ?????? ? ??????? ?????? ???????????? ????
• 1x1 ??2 ??????????
• ???????????? ????????? ???????????
• -1.2d, 2d

8
?????????????

• ?????????? ??????????????
• ???????? ????????????? ??????????
• ??????? ????????? ????????????? ???? ?????
• ???????? ??????? ???????????????? ?????????
• ???????? ?? ??????
• ??????? ? ???????????????? ?? ???????
• ???? ???????? ????????
• Geant3 (Geant4 ??? ???????? ???????????)

9
?????????? ?????? LHCb
?????????
?????
???????!
10
?????????? ?????? LHCb.
?????????
?????
Between fibers
Between fibers
Near fibers
Near fibers
????? ?????????? ?????????????. ??????
??????.
11
???????? ?????? CBM
CBM. 0.5??
LHCb. 4??
???????!
12
???????? ?????? CBM

• ??? 3 ????????? ??????????? ????? ???????
  ??????????
• ???????? ??????????? ?????????????
• ??????? ??????
• ?????? ????? ??????

Between fibers
Near fibers
????? ?????????? ?????????????. ??????
??????.
13
??????? ?????? LHCb

• ?????? ????????? 12?12??2
• 8?8 ???????
• 1.5?? ????? ?????????
• ????????? ?????? ????????? ? ???????????????
  ?????!

Between fibers
Near fibers
????? ?????????? ?????????????. ??????
??????.
14
??????????

• ???????? ?????????????? ???????
• ??????? ??????????? LHCb
• ????????? ?????? ??????????? CBM
• ??????? ??????? ????????????? ? ?????? 0.5??
• ????????? ????????? ????????????? ???????????????
• ?????????
• ???????
• ???????????????
• ????????? ????????? ?? ????????? ? ???????
• ????????? ?? ?????? ??????????

15
(No Transcript)
16
Coordinate determination

• Modify coefficients
• residuals
• keep mean at 0
• narrow
• Cut ?2lt4
• denominator from Delay wire chambers... by
  J.Spanggaard.

17
????????? ????????????? ???? ?????

• ??????
• ???????????
• ??????? ???????
• ?????????
• ??????????
• ?????????
• ?????????
• ? ?????
• ?? ???????????
• ??? ???????? ??????????/???????????? ????? ????
  ???????? ????? ?????

• ?????????
• ?????????
• ???????
• ????????????? ??????????????
• ?????? ????????

18
White paint

• Edges and edging
• edging width require fine tuning
• no mirror reflection or transparency
• scaling coefficient introduced
• one of the main parameters

19
Procedure

• 0.5x0.5mm2 regions
• Photons generated uniformly
• also on Z axis
• isotropic
• Transported till photon absorption
• Reemission in fiber
• isotropic
• check angles (transport to PMT)

20
Geant model
Steel tape, 0.2 mm

• Geant3
• Gorynych framework
• for ITEP FLINT experiment
• Tile model with holes and fibers
• same as for ray-tracing
• 67x4mm scintillator layers
• 66x2mm layers of lead
• Dead material
• steel tape, 0.2mm thick
• white paint, 0.15mm at edge of tile

White paint, 0.15 mm
Fiber in each hole