Application of the beta ray alignment for the opera csds
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Application of the Beta-ray alignment for the OPERA CSDs. Seigo Miyamoto. Beta-ray alignment. New alignment method by using beta-ray from environmental radioactive isotopes. Coincidence at contacted emulsion layers.

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Application of the Beta-ray alignment for the OPERA CSDs

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Application of the beta ray alignment for the opera csds

Application of theBeta-ray alignment for the OPERA CSDs

Seigo Miyamoto


Beta ray alignment

Beta-ray alignment

  • New alignment method by using beta-ray from environmental radioactive isotopes.

  • Coincidence at contacted emulsion layers.

  • Effective to correct the distortion( is essential for good position resolusion) of film by development or drying .


Detection of position displacement peak of beta ray

Detection ofposition displacement peak of beta-ray

-Take all combination of dx in ~+-100um

- Angle allowance is FREE.

2.1um

1.8um


If the tightness of packing is enough

If the tightness of packing is enough,

Position displacement of high energy tracks from beta-ray alignment peak (um)


Application for the opera csd

Application for the OPERA CSD

  • Alignment accuracy is less than 1um.

  • Effective to reject BG tracks very much.

Samples :

Cosmic run events ---- 26 CSDs

Neutrino events ---- 32 CSDs


At first division of area 5mm x 5mm

At first, division of area (5mm x 5mm)


Procedure

Procedure

Taking all combinations of MicroTracks in contacted layers,

And Detection of beta-ray alignment peaks in each unit areas.

Position displacement distribution from the X-ray alignment


Plot vector as the center of peak in each unit area on the film map relative distortion map

Plot vector as the center of peak in each unit area on the film map -> Relative Distortion map.

40 um

20um in delta position space


Some samples

Some Samples


Some samples1

Some Samples


Some samples2

Some Samples


Some samples3

Some Samples


Some samples4

Some Samples


Estimation of successful area

Estimation of successful area

  • Continuity check is suitable which beta-ray alignment is success or not because distortion should be continual.

  • Check the difference of vector between adjacent area.

  • For example,

  • d(dX)(a,b)=dXb-dXa

  • - if d(dX) < 10umfor >=2 adjacent areas, “a” is defined as continual(successful).

b

c

e

a

d


Beta ray alignment summary

beta-ray alignment summary


Continual area ratio of csds

Continual area ratio of CSDs

sucessful

sucessful


The reason of below 90

The reason of below 90%

  • Not enough beta-rays to align.

    ---- 1

  • Peak is detected, but double.

    ---- 5

  • Large Gap exists.

    ---- 1


Examples double peak

Examples , Double Peak


Examples double peak1

Examples , Double Peak


Examples double peak2

Examples , Double Peak


Examples double peak3

Examples , Double Peak


Examples large gap is detected

Examples , Large Gap is Detected.


Examples large gap is detected1

Examples , Large Gap is Detected.


Examples large gap is detected2

Examples , Large Gap is Detected.


Summary

Summary

  • Beta-ray alignment was applied to real OPERA Experiment.

  • The number of beta-ray for alignment is enough.

  • We estimated mechanical tightness. 26/32 CSDs is aligned successfully. 5/32 CSDs have Double Peaks, these are recoverable by detection both (We have 2 alignments, BG Doublet tracks become twice).

    1/32 CSD has large (more than 100um) gap, we can detect it.

  • We continue the study of these 6 events.


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