Volume Scan

福田 努 (Tsutomu Fukuda)

Nagoya-univ.

Event Brick# CC/NC Stop Plate

179264151 20122 CC PL10

180277945 33540 CC PL56

178684089 36564 NC PL38

179351516 01429 CC PL47

181543007 53486 CC PL25

182245114 40953 CC PL46

187381090 40742 CC PL54

7 Event located at Nagoya

Volume Scan

Volume Scan DATA set

• After location, Volume Scan .• Volume Scan Area is 1cm x 1cm from VTX point.• Scanning 5plates upper VTX Plate and 10plates below VTX Plate.

VTX Plate5plates

10plates

1cm

1cm

Scanning time (first 4event)OPERA ECC SUTS scanning

0

300

600

900

1200

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

plate

time

(sec

)

scanningplate changescanningplate chagescanningplate changescanningplate change

Scanning time/PL ~ time of PLATE set/PL

VTXconfirm Volume Scan

0

100

200

300

400

500

600

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16plate

sec

plate change- 1scanning- 1plate change- 2scanning- 2plate change- 3scanning- 3

Scanning time (later 3event)

1min

　　　　　　　　　　　　I change stream of PLATE set 　　→ time of PLATE set → ~1min/PL

• Penetrate cosmic (Event 17868408 Brick#36564 )PL28,29,30 – PL41,42,43 : 155Trk/cm2 (Nseg>9 -> BG=0)

Angle distribution (PL28 or 29 or 30)

~1cm

~1cm

About DATA quality

• Efficiency (Event 17868408 Brick#36564 )Reject low momentum Trks (top angle – bottom angle < 70mrad)155Trks -> 132Trks

Average of Fillfactor = 0.811 Average of Efficiency = 0.80 (Tracking eff x Connection eff)

Estimated total # of CR ~ 130/cm2

(> ~ 500MeV/c)

Transportation alignment

PL28,29,30 – PL41,42,43 : 334Trk/cm2(BG=0)

Angle distribution (PL28 or 29 or 30) Efficiency

Average of Fillfactor = 0.652 Average of Efficiency = 0.59 (Tracking eff x Connection eff) Estimated total # of CR ~ 890/cm2 (> ~ 500MeV/c)

(Event 17868408 Brick#36564 )

Short Summary (1)

Event Brick# # of Scan Plates

eff (ECC)

# of CR ( /cm2)

eff( 輸送

時 )# of CR ( /cm2)

179264151 20122 15 ( PL01-PL15 )

0.82 ~150 0.64 ~1000

180277945 33540 12 ( PL46-PL57 )

0.89 ~190 0.69 ~1060

178684089 36564 16 ( PL28-PL43 )

0.80 ~130 0.59 ~890

179351516 01429 16 ( PL37-PL52 )

0.79 ~140 0.59 ~860

181543007 53486 16 ( PL15-PL30 )

0.80 ~90 0.57 ~710

182245114 40953 16 ( PL36-PL51 )

187381090 40742 14 ( PL44-PL57 )

0.85 ~130 0.69 ~1230

BG Trk rejection

• Virtual Erase

• Linklet Quality check

• BaseTrk Quality check

Virtual Erase

• Delete BaseTrk of Linklet in transportation.

• Trk in transportation is ~1000 本 /PL

• Rate of delete of trk at ECC alignment : ~ 0.2%

Linklet Quality check• VPH sum of Linklet(4surface)

Penetrate TrkVPH sum

BG TrkVPH sum

BG Trk;XXXOXXOXXXChain

Penetrate Trk

Angle difference

Angle difference

BaseTrk Quality check• Angle difference (MicroTrk Angle – BaseTrkAngle) vs VPHsum

(2surface)

penetrateTrk BG Trk

Vertical axis ： (dax1)2+(day1)2+(dax2)2+(day2)2

cut cut

Short Summary (2)

Event Brick# # of Scan

Plates

eff (ECC)

Before BG rejection

eff (ECC)

After BG rejcetion

#of BaseTrk/PL(after /before)

179264151 20122 15 ( PL01-PL15 )

0.82 0.81 2003/19680

180277945 33540 12 ( PL46-PL57 )

0.89 0.89 1203/10221

178684089 36564 16 ( PL28-PL43 )

0.80 0.79 1464/12403

179351516 01429 16 ( PL37-PL52 )

0.79 0.79 1483/11961

181543007 53486 16 ( PL15-PL30 )

0.80 0.77 1693/15742

182245114 40953 16 ( PL36-PL51 )

187381090 40742 14 ( PL44-PL57 )

0.85 0.85 1599/15967

About Event 182245114

• There is PLATE ID Xray Mark in Scan Area.

• Efficiency~60%? → fail estimation of efficiency??

• For Data quality check and BG rejection, we analyze much more detail about effect for Alignment.

→ now processing

Near Future• About Volume Scan Area

and time

VTX Analysis Scan stream

Judgment ! ・ 1ry VTX ・ 2ry VTX ・ e-pair ・ Kink

daughter

1cm

Scan Level 1:VTX confirm

Scan Level 2:　 Decay Search Volume (for momentum measurement)

Scan Level 3: π0 Search Volume (~3X0)

Stop Plate

5mm

Recent Scanning time• 5mm x 5mm x 7plates /Event

0

50

100

150

200

250

1 2 3 4 5 6 7 8 9 10 11 12 13 14

plate

sec plate changer

scanning

Ev187249566 Ev191894066

Sheet change

Reduction of Scanning time • Decrease Scanning Area　　→ (16cm2 /16plate → 6.2cm2/14plate)• Omit Surface recognition of start of Scanning 　　→ already process in SUTS-03. data

quality is good.　　→ Scanning time is reduced 30%.• Both direction Scan　　→ scanning time will be ½.　　→ from now (Nakano-san)

Scanning time : 6.2/16 x 0.7 x 0.5 x (390sec x 16plate) /60 ~ 14minPlate change time : 50sec x 14plate /60 ~ 12minTotal : 14+12 = 26min/event

Before vs After

0skip 1skip 2skip

Reject前

465 2221 8057

Reject後

263 389 826

# of Chain # of Group efficiency

Reject前

112563 63530 0.80

Reject後

10624 8553 0.79

Linklet

Chain