LEPS experiment from 2008.Jan to 2009.Jul

• 2008.Jan-Jul: 257nm laser, LH2 tagger rate ~2x105 /s

• 2008.Oct-Nov: 355nm laser, LD2 tagger rate ~1x106 /s Speed up DAQ by decentralizing the TPC sense-wire readout and modifying the program. Trigger: sideway + forward

• 2008.Dec, 2009Feb,Jul: 355nm laser, LH2 : confirm the old TPC data,• calibration, etc.• 2009.Mar-Jul: 355nm laser, LHe : search for the hypernuclei

2.96 GeV LH2 1405

) ( (*)

*0*

K)(Λp

KKKΘp*

using the new TPC and new liquid cryo-target system

~8x1011 photons(~ old TPC run)

2.4 GeV LD2 ppKΘ

KΘn

s

""

~1.6x1012 photons

~2.0x1012 photons

bound4 )( : )1520(He dΘXX

~4.6x1012 photons

2008B-2009A ：主な trouble & setting 変更• 10/2: TPC FADC 配線変更　（高速化） , プログラム修正 10/9-10/11: LD2, trigger#23(TPC) [DC2U に歯抜け not for analysis]• 10/11: DC2U PA 交換、 TagPL hrtdc 用 delay 一部変更 10/12-10/16: LD2, trigger#23• 10/16: replace AC （ 1.0081.03), set ee-veto scinti add STD trigger 10/16-10/28, 11/13-11/29: LD2, trigger#24(TPC+STD) 11/17-12/7: LH2, trigger#24• 12/7: DC1U trip [12/7-12/12: DC1U 無しのデータ　 not for analysis]• 1 月～ 2/4: DC1 修理、 TOF 研磨、 AC 交換（ 2 枚 3 枚）• 2/4: setting&alignment(DC1,solenoid(TPC)+NDC,FWD,TOF) 2/7-2/8: LH2, trigger#24• 2/8: Solenoid OFF [2/8-2/13 solenoid 磁場無しのデータ　 not for analysis] • 2/13: solenoid temperature was recovered solenoid ON 2/13-21: LH2, trigger#24• 2/21: A wire of DC1V was broken (2/24,25 修理 )

2008B-2009A ：主な trouble & setting 変更• 3/2: setting & alignment (DC1,solenoid(TPC)+NDC,FWD)　　　 3/2-3/12: LHe, trigger#25(TPC/2+STD) [ 標的中に泡成長 not for analysi

s]• 3/24,27: DC1 再修理、レーザー系 第 1 、第 2 ミラー交換　　　 4/6-4/22, 5/15-5/30, 6/1-6/17, 6/25-7/5: LHe, trigger STD (5/15: set rate-monitor, 6/1: replace it to new one, 6/24: reset it)　　　 7/7-7/24: LH2, trigger#24 (7/12: solenoid quench recover soon) 7/25-7/26: 磁場無しラン　 (for software alignment) 7/26-28: Cu(test), trigger#24(narrow)NB ） 10/15-10/28: AC1 は noisy 6/7-6/9: all DC gains were large due to incorrect gas mixture 6/28-30: peakADC of TPC anode#33 was strange 6/27-7/28: there might be a bad channel in the PADs of sector6, layer5 <Check scalers and singles histograms for all runs with modified online_ana> Summary and corrected photon numbers of each run used for analysis: http://www.rcnp.osaka-u.ac.jp/~yosoi/NTPC_Doc/index.html

Correction factor for Tagger scaler • Calculate the correction factor according to Tech-note No.15 by Kohri 　 (slightly

modified)

Pile-up events: |T(i)-T(j)|< T_width ( best T_width=40nsec) Correction factor : R=generated events/(generated events – pile-up events) 　

why?

Correction factor for each filling pattern

TPC&STD/ Tag (horizontal)

141618202224262830

41800 41900 42000 42100 42200 42300 42400 42500 42600Run#

Ratio

C- modeD- modeE- modeM- modeC- modeD- modeE- modeA- mode

TPC&STD/ corTag (horizontal)

141618202224262830

41800 41900 42000 42100 42200 42300 42400 42500 42600Run#

Ratio

C- modeD- modeE- modeM- modeC- modeD- modeE- modeA- mode

17.73±0.51

LHe run

corrected

TPC&STD/ Tag (Horizontal)

202224262830323436

40500 40600 40700 40800 40900 41000 41100Run#

Ratio

Db- modeA- modeA- modeEb- modeM- mode

TPC&STD/ corTag (Horizontal)

202224262830323436

40500 40600 40700 40800 40900 41000 41100Run#

Ratio

Db- modeA- modeA- modeEb- modeM- mode

25.15±0.38

LD2 run

corrected

TPC&STD/ Tag (Horizontal)

10

12

14

16

18

20

41000 41100 41200 41300 41400 41500 41600Run#

Ratio

TPC&STD/ Tag (Horizontal)

10

12

14

16

18

20

42500 42600 42700 42800Run#

Ratio

M- modeDb- modeDb- modeC- modeM- modeA- modeM- modeC- modeDa- mode

TPC&STD/ corTag (Horizontal)

10

12

14

16

18

20

41000 41100 41200 41300 41400 41500 41600Run#

Ratio

TPC&STD/ corTag (Horizontal)

10

12

14

16

18

20

42500 42600 42700 42800Run#

Ratio

M- modeDb- modeDb- modeC- modeM- modeA- modeM- modeC- modeDa- mode

LH2 run

13.16±0.25

corrected

Data statistics• Corrected tagger photon# ×DAQ live ratio LHe(Std): 4.55x1012 (hori 2.25x1012, vert 2.30x1012) LD2(#24/#23): 1.64x1012 (hori 0.82x1012, vert 0.82x1012) [trig#24 1.41x1012/ trig#23 0.23x1012] LH2(#24): 1.96x1012 (hori 0.93x1012, vert 1.03x1012)• Luminosity (L=nb ・ NT 　　　 NT =NA/A 　 ) Scaling factor of transmission: 0.525±0.013 (from PWO data) Target density of LHe/LD2/LH2 with 15cm at boiling point 1.875 g/cm2, 2.535 g/cm2, 1.062 g/cm2

Luminosity: LHe 6.79x1035 cm-2 =0.679 pb-1

LD2 6.53x1035 cm-2 =0.653 pb-1

LH2 6.53x1035 cm-2 =0.653 pb-1

cf.) 3GeV LH2 ( ～ 0.8x1012x0.532)x(1.062xNA/A) = 0.27 pb-1

Check pedestal files (miho:/np1b/v04/sp8lep/ntpc/pede/)

・ remove some strange runs　 (not junk runs in the log-note)

・ ch1253 (Preamp79, ch 5) shows 2 lines. (sector 6, layer 7, 3rd pad)

Run#

pede

stal

_mea

n

NTPC gain correctionwith cosmic-ray data

wire gain (r40210)

40

50

60

70

80

90

100

110

0 10 20 30 40 50 60anode #

peak

chan

nel

cut- fixnocut- fix

gain

8090

100110120130140150160170

0 5 10 15 20layer#(U:1- 9,D:10- 18)

peak

chan

nel

padwire sumwire sum0

cut: |dip angle|<15° -1717<z<-1517

Pad (peakAdc) vs wire sum good wihi / wi

w-2=w2=0.127516 w-1=w1=0.245298 w0=0.298944読んでいない両端の Wire は　1 番目と 27 番目の wire の x0.5が良い

z- dependence of Pad gain (Gauss fit)

0.80.850.9

0.951

1.051.1

1.151.2

1.251.3

- 1900 - 1800 - 1700 - 1600 - 1500 - 1400 - 1300 - 1200 - 1100z (mm)

ratio

for z

=-16

17

U- aveD- aveSum

z-dependence of Pad gain

x

y

z

y

(-25<x<25)(-1717<z<-1517)