Abstract
Automatic nuclear emulsion readout systems have seen remarkable progress since the original idea was developed almost 40 years ago. After the success of its full application to a large-scale neutrino experiment, OPERA, a much faster readout system, the hyper-track selector (HTS), has been developed. HTS, which has an extremely wide-field objective lens, reached a scanning speed of 4700 cm$^2$/h, which is nearly 100 times faster than the previous system and therefore strongly promotes many new experimental projects. We will describe the concept, specifications, system structure, and achieved performance in this paper.
Highlights
Nuclear emulsion is a three-dimensional particle tracking detector with a submicron spatial resolution
We evaluated the Hyper Track Selector (HTS) performance by using real data of the nuclear emulsion films exposed in a GRAINE 2015 flight [21]
HTS has been developed with a wide field lens of 5.1×5.1 mm2 field of view (FOV) and 72 two-megapixel sensors to cover this FOV
Summary
Nuclear emulsion is a three-dimensional particle tracking detector with a submicron spatial resolution It has been used for cosmic ray research and has contributed to the discoveries of π-meson [1] and charmed particles [2]. To recognize the recorded trajectory with submicron accuracy in those cosmic-ray experiments, the emulsion films were scanned by eye using microscopes This time-consuming method strongly limited the statistics. To improve this situation, an automatic nuclear emulsion readout system, named Track Selector, has been developed in Nagoya University [3][4][5] and applied to many high-energy experiments, WA75 [6], E653 [7], E176 [8], CHORUS [9], and DONUT [10]. In the OPERA analysis over more than five years, the scanning area for those readout systems reached the order of 100 m2, and the systems have contributed to the discovery of νμ → ντ oscillation in the appearance mode [14][15]
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