Time stamping for Emulsion Tracks with Gyaku Data Base method

070122

Y.Nonoyama

Introduction

• Last autumn, I showed the GyakuDataBase method in meeting @ Matsumoto.

• Now, I’m developing.

• I try time stamping systematically.

• So, I’m looking for good separation parameter.

• Today, I show a part of it.

Gyaku Data Base

Emulsion track

match

no match

allowance

match

• Emulsion track extension down stream.• Look for SFT hits on the Emul track ??

Allowance : +- (1mm + 3mrad z axis)SFT plane alignment + angle measurement error

(and scattering error)

match

SFT = 10layer (x,y-projection), 2layer (u-projection)

beam

Sample 1 : BL040

No x-ray

BL040 PL1-2

Alignment in MINOS hall Alignment in Transportation

8 x 7 cm2 SUTS scan

Alignment in Transportation Alignment in MINOS hall

BL040 PL1-2After virtual erase

BL040 PL1-2

Peak 2

Peak 1

BL040 PL1-2

Peak 1 Peak 2

SFT matching (903 tracks)

x vs y

Residual from nominal

Using SFT reconstructed tracks

After alignment between ECC with SFT

x

y

x

y

mm

mm

rad

rad

Select Scan Back tracks with GyakuDataBase

• I selected 165tracks matching with SFT trigger. I thought these are from Interaction.

• Checked again and selected good match 31tracks with SFT trigger from them.

• And, best matched tracks are 20 in 31tracks.– 13 are Rock Muon type.– 7 are Interaction type.

How decide best match ?

• Important point, there is SFT hits directory below plane of ECC target.

• If matching is real, SFT hits exist far 1~2 fibers .

• Also It’s same low momentum particle. Because no material between ECC target to directory below SFT plane.

point

Residual of Emulsion track to hits ofdirectory below plane

• This showed residual.• extension emulsion track to below SFT plane.• Select tracks matching with SFT trigger as Rock Muon type by eyes.

y x x y2 3

mm

If matching is real, its residual will be into 500m.

mm

mm

mm

31tracks scan back resultSFT trigger type

Scan back result

Penetrate stop Not yet

Rock Muon 2 0 11 13

Interaction 0 4 3 7

Unknown 0 1 4 5

Not so good 2 4 1 7

79

0.0, 0.1

-0.3

108

0.2

-0.3

572-0.4

0.3, 0.4

573-0.3

0.3

623

-0.1, -0.6

-0.2

6940.4, -0.4

0.0, -0.1

-0.4

1.1

penetrate

281

-1.0

0.2

penetrate

818

Sample2 : BF021

* x-ray

Select scan back track like BL040 and Scan back result

SFT trigger type

Follow up result

Penetrate Stop

Rock Muon 7 0 7

Interaction 0 2 2

0.0, 0.4

0.2, -0.2

-0.3, 0.1

0.3, 0.1

PL 43I.P. 1.5m

summary

• Now looking for good separation parameter.• One is below SFT plane hits.• This selection power is very good.• Bud SFT link efficiency is effected by SFT

efficiency.• So, other selection parameter will be needed

for efficiency.