The OPERA experiment is designed to search for nu-tau appearance in almost pure CERN-SPS
nu-mu beam. The OPERA detector is placed in the Gran Sasso underground laboratory which
is 730 km away from CERN. It is a hybrid set-up which combines a lead/emulsion target
with various electronic detectors. The detector is composed of two super modules(SM) which
contains about 150,000 ECC bricks. Each of the brick is obtained by stacking 56 lead plates
with 57 emulsion films. Behind the each brick, an emulsion film doublet, called Changeable
Sheet (CS) is attached in order to confirm tracks produced in neutrino interactions. The CS
requires very low background track density in order to ensure the expected performance in
the experiment. The background tracks in CS can be erased by a special treatment called as
refreshing. A refreshing facility was constructed in the LNGS laboratory. The METU group
has participated in the construction of the facility and the production of the CS films from
the beginning. The main steps of emulsion refreshing and the test results on emulsion quality
after the refreshing will be discussed. A Monte Carlo simulation is performed in order to
estimate background to nu-mu to nu-tau oscillation due to D0 production and decay in the ECC brick.
It is found that this background is significant for the short decay path topology of the tau lepton.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12610330/index.pdf |
| Date | 01 February 2009 |
| Creators | Tufanli, Serhan |
| Contributors | Guler, Ali Murat |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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