EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH
CERN/SPSC/98-2
/SPSC/M604
14 January 1998
TOP
A Prototype for the TOSCA Experiment
TOSCA Collaboration 
We propose to build a prototype of the TOSCA detector (TOP) as a necessary step to the development of the full apparatus.
The basic design
of TOSCA consists of 6 quasi-independent modules. Each module is made of an
emulsion target, followed by a silicon tracker, an optional emulsion spectrometer and
electronic detectors for pattern recognition and momentum measurement.
The dimensions of the target and the silicon tracker
are of about 1.4 
1.4 m 
. Mechanically, both are made of four
independent quarter modules of dimensions of about 72 72 cm .
The prototype proposed here consists of a complete quarter of a module for the emulsion target, silicon tracker and emulsion spectrometer. This quarter module would be installed inside the NOMAD magnet. The prototype would be completed with re-used elements from NOMAD: electronic trackers, a transition radiation detector, electromagnetic and hadron calorimeters and muon detectors.
We argue that two months of data taking with neutrino and hadron beams would be extremely valuable to understand and optimize the design of the TOSCA detector as well as to acquire experience towards building a large scale detector. We propose to build the prototype in 1998 and 1999 and to take data for a two month period in 1999.
CERN, Geneva, Switzerland;
Dortmund Universit 
t, Dortmund, Germany;
Harvard University, Cambdrige, MA, USA;
Humboldt Universit t, Berlin, Germany;
Institute for Nuclear Research, INR Moscow, Russia;
Inter-University Institute for High
Energies (ULB-VUB), Brussels, Belgium;
JINR, Dubna, Russia;
Kobe University, Kobe, Japan;
METU, Ankara, Turkey;
M 
nster Universit t, M nster, Germany;
Nagoya University, Nagoya, Japan;
Rudjer Boskovic Institute, Zagreb, Croatia;
Technion, Haifa, Israel;
Toho University, Funabashi, Japan;
Università di Bari and INFN, Bari, Italy;
Università di Cagliari and INFN, Cagliari, Italy;
Università di Ferrara and INFN, Ferrara, Italy;
Università Federico II and INFN, Napoli, Italy;
Università di Padova and INFN, Padova, Italy;
Università La Sapienza and INFN, Roma, Italy;
Università di Salerno and INFN, Salerno, Italy;
Université Catholique de Louvain, Louvain-la-Neuve, Belgium;
Université de Lausanne, Lausanne, Switzerland;
University of Athens, Athens, Greece.