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.
-Take all combination of dx in ~+-100um
- Angle allowance is FREE.
Position displacement of high energy tracks from beta-ray alignment peak (um)
Cosmic run events ---- 26 CSDs
Neutrino events ---- 32 CSDs
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
20um in delta position space
1/32 CSD has large (more than 100um) gap, we can detect it.