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LEPS experiment from 2008.Jan to 2009.Jul

LEPS experiment from 2008.Jan to 2009.Jul. using the new TPC and new liquid cryo-target system. 2008.Jan-Jul: 257nm laser, LH 2 tagger rate ~2x10 5 /s 2008.Oct-Nov: 355nm laser, LD 2 tagger rate ~1x10 6 /s Speed up DAQ by decentralizing the TPC sense-wire readout

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LEPS experiment from 2008.Jan to 2009.Jul

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  1. LEPS experiment from 2008.Jan to 2009.Jul using the new TPC and new liquid cryo-target system • 2008.Jan-Jul: 257nm laser, LH2tagger rate ~2x105 /s • 2008.Oct-Nov: 355nm laser, LD2tagger 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 Q+ hypernuclei 2.96 GeV g LH2 ~8x1011 photons (~ old TPC run) 2.4 GeV g LD2 ~1.6x1012 photons ~2.0x1012 photons ~4.6x1012 photons

  2. 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（1.0081.03), 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)

  3. 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 analysis] • 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

  4. 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?

  5. Correction factor for each filling pattern

  6. 17.73±0.51 LHe run corrected

  7. 25.15±0.38 LD2 run corrected

  8. LH2 run corrected 13.16±0.25

  9. 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・NTNT =rNA/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

  10. Check pedestal files (miho:/np1b/v04/sp8lep/ntpc/pede/) pedestal_mean Run# ・ remove some strange runs (not junk runs in the log-note) ・ ch1253 (Preamp79, ch 5) shows 2 lines. (sector 6, layer 7, 3rd pad)

  11. NTPC gain correction with cosmic-ray data cut: |dip angle|<15° -1717<z<-1517 Pad (peakAdc) vs wire sum  good S wihi /S 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

  12. z-dependence of Pad gain (-25<x<25) (-1717<z<-1517) y y z x

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