CERN Accelerating science

Article
Report number	CERN-EP-2001-074
Title	The large area Emulsion Tracker of the CHORUS experiment
Author(s)	Aoki, S ; Dupraz, J P ; Fabre, Jean-Paul ; Flegel, Wilfried ; Hara, T ; Ishii, Y ; Kawamura, T ; Kim, D C ; Kurihara, T ; Niu, E ; Ogawa, S ; Shibuya, H ; Song, J S ; Van Beek, G ; Vilain, P ; Watanabe, J ; Wilquet, G ; Yoon, C S
Affiliation	(Kobe Univ., Kobe) ; (CERN) ; (Toho Univ., Funabashi) ; (Gyeongsang Nat. Univ., Jinju) ; (Inter-University Inst. High En., ULB-VUB Brussels) ; (Univ. Federico II and INFN, Naples) ; (Center for Chronological Research, Nagoya Univ., Nagoya)
Publication	2002
Imprint	12 Oct 2001
Number of pages	25
In:	Nucl. Instrum. Methods Phys. Res., A 488 (2002) 144-154
DOI	10.1016/S0168-9002(02)00484-9
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN SPS ; CHORUS WA95
Abstract	A new type of tracking device using large area nuclear emulsion sheets was developed for the short baseline neutrino oscillation experiment, CERN-WA95/CHORUS. The emulsion tracker is made of three layers, each 25 mm thick including support, and covering an area of about 5 m$^2$. Two layers were installed upstream and one downstream of the hexagonal magnet of the CHORUS hadron spectrometer. The achieved position resolution over the whole area is 25 $\mu$m, which keeps the momentum resolution of the spectrometer below 30\% up to momenta of about 15 GeV/$c$.

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