HYPOLIT, a high resolution fast beam RICH

doi:10.1016/0168-9002(94)90554-1

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Volume 343, Issue 1, 1 April 1994, Pages 218-221

https://doi.org/10.1016/0168-9002(94)90554-1 Get rights and content

Abstract

A new Cherenkov counter has been designed for on-line tagging of high energy particles, more specifically 270 GeV hyperons in WA89 experiment at CERN. It is equipped with a 6 m focal length spherical mirror and a chromatic corrector. The ring size is reduced by a factor of 8 (adjustable) by means of a set of two conical mirrors. The photon detector is an image intensifier. Its output window is divided in 160 pixels read with photomultipliers via optical fibres. The ring radius is determined electronically and a tagging signal is available in less than 2.5 μs. HYPOLIT has been tested in a 220 GeV pion beam (50 μrad divergence). A spatial resolution of 0.125 mm on the radius has been obtained, and the pion—kaon separation was better than 5σ.

References (9)

Report CERN-SPSC/87-43
(1987)
P. Grafstrom
A phase II hyperon beam
WA89 internal report
(1991)
C. Bovet
report CERN-SPS/82-13
(1982)
R. Touillon

There are more references available in the full text version of this article.

Cited by (2)

Studies of charm production and a search for exotic states at the CERN-SPS hyperon beam
1999, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
We report results from the hyperon beam experiment WA89 at the CERN-SPS for which particle identification provided by the Omega-RICH was essential. One item is the measurement of inclusive production cross-sections of charmed hadrons, where K $^{−}$ identification greatly enhanced the purity of the observed samples. These measurements further confirmed the existence of the leading particle effect also in charm production. A second item is the search for the exotic state U(3100) decaying to $Λ, p ̄$ and pions. No signal was found.
Prospects for hadron electromagnetic polarizability measurement by radiative scattering on a nuclear target
1995, Nuclear Inst. and Methods in Physics Research, A
A Monte Carlo simulation of hadron radiative scattering measurements on nuclei (h + A → h + γ + A) by the Compton-Primakoff process is presented. The reaction with 40 GeV pion is studied and the results are compared with experimental data on carbon. Accuracy on the polarizability parameters expectable from higher energy measurements with currently available secondary beams of negatively or positively charged hadrons is discussed.

¹: Present address: PPE division, CERN, CH-1211 Geneve 23, Switzerland.

²: Institut für Kernphysik, University of Mainz, Germany.

View full text

HYPOLIT, a high resolution fast beam RICH

Abstract

Report CERN-SPSC/87-43

A phase II hyperon beam

WA89 internal report

report CERN-SPS/82-13