J. T. Shank

Performance of the CRID at SLD

Abstract This paper describes the performance of a large 4π Cherenkov Ring Imaging Detector (CRID) in the SLD experiment at the SLC at SLAC. We compare the most recent SLD results with those obtained during the R&D period, discuss various design features, and highlight some specific lessons derived from three years of operation.

Position and timing resolution of interpolating cathode strip chambers in a test beam

Abstract Design and construction details are presented of a four-layer, position sensitive, cathode strip chamber and a low cost, highly multiplexed readout system based on monolithic circuit technology that are well suited for a muon detector at future hadron colliders. Track location is determined by interpolation of the cathode induced charge, using a new design with intermediate strips between readout nodes to reduce the number of channels and improve position resolution and linearity. Results are reported from tests with an 55 Fe source and a 300 GeV/ c muon beam in RD5 at CERN. The beam test demonstrated position resolution of 40 μ m per layer which is less than 1% of the readout pitch. The timing resolution for the entire four-layer detector was 3.6 ns r.m.s. which is adequate for fully efficient beam crossing identification in an LHC experiment.

Particle identification performance of a straw transition radiation tracker prototype

Abstract An 864 channel prototype of an integrated straw tracker and transition radiation detector for tracking and electron identification has been tested with and without magnetic field at the CERN SPS. The rejection against hadrons and converted photons has been measured and the dependence of the rejection power on detection parameters has been investigated. Tracking and hadron rejection were also studied in a high multiplicity environment. The results are compared with Monte Carlo simulations. Wherever possible, conclusions are drawn concerning the performance of a full-scale detector at the future Large Hadron Collider.

The fluid systems for the SLD Cherenkov Ring Imaging Detector

The design and operation of the fluid delivery, monitor, and control systems for the SLD barrel Cherenkov Ring Imaging Detector (CRID) are described. The systems deliver drift gas (C/sub 2/H/sub 6/+TMAE), radiator gas (C/sub 5/F/sub 12/+N/sub 2/), and radiator liquid (C/sub 6/F/sub 14/). Measured critical quantities such as electron lifetime in the drift gas and ultraviolet (UV) transparencies of the radiator fluids, together with the operational experience, are reported. >

Obtaining physics results from the SLD CRID

Abstract We describe the likelihood ratio method used for particle identification in the SLD CRID, which allows the use of the entire momentum range covered by the liquid and gas radiators, including the threshold regions. Its application to two preliminary physics analyses is also described.

Double track resolution of cathode strip chambers

Abstract Details are presented of a method to resolve close tracks in cathode strip chambers based on the fit to the induced charge distribution. The analysis of muon beam test data demonstrated a double track resolution of about 2 mm for a readout pitch of 5 mm. The degradation of the position resolution in the presence of a close track is limited to 10% of the readout pitch.

Operational status and performance of the SLD CRID

Abstract The operation and performance of the SLD CRID achieved during the recently completed 1994–1995 run of the SLC will be discussed. Stable operation of liquid (C6F14) and gas (85% C5F12 and 15% N2) radiators with good UV transparency has been achieved. Our expectations for the future SLD physics program will also be briefly discussed.

A UV laser technique for the Lorentz effect compensation studies in end-cap cathode strip chambers

Abstract We report on a technique to study the Lorentz effect compensation in muon end-cap cathode strip chambers in detectors with solenoidal magnetic fields like GEM and CMS. The method utilizes a pulsed UV laser for depositing a track-like ionization in a chamber volume and a specially designed chamber with a rotating anode wire frame. The optimal compensation angle was measured to be 26.6±0.5° in a 3.4 T magnetic field using the M1 magnet of the RD5 experiment at CERN. The results are in good agreement with simulations.

Performance of the SLD barrels CRID during the 1992 physics data run

Summary form only. The performance of the Cherenkov Ring Imaging Detector (CRID) of the SLD experiment at the SLAC linear collider during the 1992 physics data run is discussed. The barrel CRID is complete and fully operational. Cherenkov rings have been observed from both the liquid and the gas radiators. The rings are associated with particle tracks measured in the central drift chamber and the radius of the ring together with the momentum measurement is used to identify particles. Work is in progress to improve the resolution by better determining the position of the drift boxes, the mirrors, and the central drift chamber relative to one other using data from cosmic rays and Z/sup 0/ chambers. >

THE FIRST RESULTS FROM THE CRID DETECTOR AT SLD

We report first results from the initial physics run of the Cherenkov Ring Imaging Detector (CRID) in the SLD experiment at the SLC. We describe the experimental conditions, show liquid and gas rings, report the number of photoelectrons per ring, and comment on resolution.