A novel automatic film changer for high-speed analysis of nuclear emulsions

Laboratory for High Energy Physics, University of Bern, Sidlerstrasse 5, Bern 3012, Switzerland
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (Impact Factor: 1.22). 10/2006; 566(2):327-337. DOI: 10.1016/j.nima.2006.07.042
Source: arXiv


This paper describes the recent development of a novel automatic computer-controlled manipulator for emulsion sheet placement and removal at the microscope object table (also called stage). The manipulator is designed for mass scanning of emulsions for the OPERA neutrino oscillation experiment and provides emulsion changing time shorter than 30 s with an emulsion sheet positioning accuracy as good as RMS.

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Available from: Jérôme Damet, Jan 15, 2014
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    • "developed in Europe, the so-called European Scanning System (ESS), able to reach a frame rate of 400 frames per second and to scan up to 20 cm 2 /hour of emulsion surface with real-time track reconstruction [15] [16]. The LHEP played a key role in the development of the ESS, with the implementation of the dry objective scanning technique [17] and the realization of robots for the automatic emulsion film handling [18]. LHEP presently hosts the largest scanning laboratory in Europe with its six microscopes for the OPERA event analysis, the second in the world, after that of Nagoya (figure 4). "
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    ABSTRACT: We propose to build and operate a detector based on the emulsion film technology for the measurement of the gravitational acceleration on antimatter, to be performed by the AEgIS experiment (AD6) at CERN. The goal of AEgIS is to test the weak equivalence principle with a precision of 1% on the gravitational acceleration g by measuring the vertical position of the anni- hilation vertex of antihydrogen atoms after their free fall in a horizontal vacuum pipe. With the emulsion technology developed at the University of Bern we propose to improve the performance of AEgIS by exploiting the superior position resolution of emulsion films over other particle de- tectors. The idea is to use a new type of emulsion films, especially developed for applications in vacuum, to yield a spatial resolution of the order of one micron in the measurement of the sag of the antihydrogen atoms in the gravitational field. This is an order of magnitude better than what was planned in the original AEgIS proposal.
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    ABSTRACT: The extensive use of nuclear emulsions as precise tracking detectors in experimental physics has been made possible due to recent advances in the production of novel emulsion films and to the development of automatic scanning devices. The scanning speed of such systems has ex-ceeded the level of 20 cm 2 of emulsion surface per hour. High-speed automatic scanning systems, such as those developed by the OPERA Collaboration, are able to reconstruct particle tracks in nu-clear emulsions with excellent accuracy. However, the high-magnification oil immersion objectives used in these systems assume deposition and removal of oil onto and from the emulsion films. This is a major technological obstacle in the automatization of the emulsion feeding to the microscope, as required for large scale use as in the case of the OPERA neutrino oscillation experiment. In order to overcome this problem, an innovative technique of nuclear emulsion films scanning with the use of dry objective lenses has been developed and successfully applied to the experiment.
    Full-text · Article · Apr 2008 · Journal of Instrumentation
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    ABSTRACT: The hypothesis of neutrino flavour changing in weak interaction representation via oscillations is confirmed by several experiments, all based on the observation of the disappearance of a given neutrino flavour. The direct appearance of a flavour different from the initial one, was never observed so far. OPERA is the first long baseline neutrino oscillation experiment employing nuclear emulsions for the direct observation of tau neutrinos in the CERN to Gran Sasso muon neutrino beam. At present the experiment is in the data taking phase. The number of detected neutrino interactions have exceeded one thousand. Experiment status and a summary of results from 2007 and 2008 runs is presented in this paper.
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