Performance of cylindrical wide gap spark chambers with transparent wire electrodes
Two large wide-gap spark chambers with transparent wire electrodes will be used for the measurements of the outgoing particle momenta in the magnetic spectrometer experiment (MEA) at Adone. The chambers have four gaps each with cylindrical electrodes and cannot be viewed in the usual way, that is through the plexiglass frames because of the presence of iron in the msgnetic flux return. The magnet is a 2-meter long solenoid with a diameter of 2 meters and axis perpendicular to the electron positron beams. The use of wire electrodes instead of the usual aluminium foils, reduces the multiple coulomb scattering and more importantly allows one to view the sparks through the transparent electrodes themselves. In this way the complete special reconstruction is made possible even usirg only one view. For the construction and the search of good workirg conditions of these chambers, with about 2 m/sup 3/ of sensitive volume, many difficulties due to the great dimensions, to interference problems between the gaps, and to the effects caused by the distortion of the electric field at the edges must be overcome. The solution to these problems obtained at first using some small dimension prototypes and then the final chambers is discussed, and the sing these chambers is rported. (WHK)
- Research Organization:
- Comitato Nazionale per l'Energia Nucleare, Frascati (Italy). Laboratori Nazionali di Frascati
- Sponsoring Organization:
- Sponsor not identified
- NSA Number:
- NSA-29-005232
- OSTI ID:
- 4934074
- Report Number(s):
- LNF--73-26
- Country of Publication:
- Italy
- Language:
- English
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