S. Shapiro

Construction and initial operation of a proportional wire detector for use in a Cerenkov ring imaging system

The final version of the multiwire single-electron detector for the Cerenkov ring imaging device of the Stanford Linear Collider Detector is described. Recent research-and-development efforts to define the design parameters are reported. These were concerned with computer simulations necessary for the detector design; wire aging and its solution; surface resistivity and voltage breakdown of G-10 in a TMAE environment; corona studies for various gases; wire breaking in the spark; measured mechanical characteristics of 7- mu m carbon wires; wire-stretching technique for 7- mu m carbon wires; and wire tension measuring for th final detector. The details of the geometry of the detector and experimental tests with the detector itself are discussed. >

Charge Division Using Carbon Filaments for Obtaining Coordinate Information from Detection of Single Electrons

Seven micron diameter Carbon filaments forming the anode of a multiwire proportional chamber have been used to detect single electrons. Charge division techniques applied to the 5 cm long wire resulted in a position resolution of ¿/L <2% for a collected signal charge of 30 fC.

Development and construction of the SLD Cherenkov ring-imaging detector☆

Abstract We report on the development and construction of the Cherenkov ring-imaging detector (CRID) for the SLD experiment at the SLAC linear collider. In particular, we outline recent progress in the construction and results from testing the first components of the barrel CRID, including the drift boxes, liquid radiator trays and mirror system. We also review progress in the construction of the barrel CRID gas radiator vessel, the liquid radiator recirculator system, and the electronic readout system. The development of a comprehensive monitor and control system - upon which the stable operation and physics efficacy of the CRID depend — is also described.

Development of the cerenkov ring imaging detector for the SLD

Results of recent beam tests of a physics prototype cerenkov Ring Imaging Detector (CRID) for the SLD are reported. The system includes both liquid (C6F14) and gas (isobutane) radiators and an 80 cm quartz TPC with a gaseous TMAE photocathode and proportional wire readout. Measurements of the quality factor (N0) and cerenkov angles of both radiators at various TMAE concentrations and beam momenta are presented. Other system characteristics, including electron lifetimes, spatial resolution, photon feedback and preliminary results from third coordinate charge division readout are discussed.

Development of the CRID single-electron wire detector☆

Abstract We describe the R&D effort to define the design parameters, method of construction and experimental results of single-electron wire detectors. These detectors will be used for particle identification using Cherenkov ring-imaging techniques in the SLD experiment at SLAC. We present measurements of pulse heights for several gases as a function of gas gain, charge division performance on a single-electron signal using both 7 and 33 μm diameter carbon wires, photon feedback in TMAE-laden gas, average pulse shape, and its comparison with the predicted shape and cross-talk. In addition, we present results of wire aging tests and other tests associated with construction of this unusual type of wire chamber.

Progress report on Cerenkov ring imaging detector development

The authors present recent progress on the construction and testing of the first drift boxes and single-electron detectors as they come from the production line. These detectors will be used for particle identification using the ring imaging technique in the SLD (Standard Linear Collider Large Detector) experiment. Various experimental results are presented, including single-electron pulse height measurements as a function of gas gain, detector gating capability, uniformity of response across the wire plane, charge division performance of a single-electron signal, average pulse shape and its comparison with predicted shape, and crosstalk. >

Progress report on the SLD cerenkov ring imaging detector

We describe test beam results from a prototype cerenkov Ring Imaging Detector (CRID) for the SLD experiment at the SLAC Linear Collider (SLC). The system includes both liquid and gas radiators, a long drift box containing gaseous TMAE and a proportional wire chamber with charge division readout. Measurements of the multiplicity and detection resolution of cerenkov photons, from both radiators are presented. Various design aspects of a new engineering prototype, currently under construction, are discussed and recent R&D results relevant to this effort are reported.

The performance of the Barrel CRID at the SLD; long-term operational experience

The Barrel CRID detector has been operating successfully at SLD for the past seven years. It is an important tool for SLD physics analyses. We report results based on long term operational experience of a number of important quantities such as the Cherenkov quality factor, N/sub 0/ of the device, fluid transparency, electron lifetime, single electron detection efficiency, anode wire ageing, TMAE purity, long term transparency, Cherenkov angle resolution and the number of photoelectrons observed per ring.

Progress report on the SLD Cerenkov Ring Imaging Detector system

The authors report on the development of the Cerenkov Ring Imaging Detector (CRID) for the SLD experiment at the SLAC Linear Collider. They outline recent progress in engineering and construction techniques that will greatly simplify the manufacture of the 40 quartz-window drift tubes required for the barrel CRID. Progress in the preliminary design of the endcap CRID is reviewed, and the development of operating, monitoring, and control systems for the complete detector is discussed. >

Cerenkov Ring Imaging Detector Development for SLD

Progress in the development of a time projection style photoelectron detector is reported. The development is intended to demonstrate the principles and determine specifications for a practical design of the large CRID device recently described in the SLD design report, wherein a large detector for the Stanford Linear Collider is described. The drift detector utilizes the technique of photo-ionization of Cerenkov light in tetrakis-dimethylamino-ethylene (TMAE) vapor at (1700-2200 Å), and drifting the photoelectrons tens of centimeters to a proportional chamber picket fence, where the drift time provides one coordinate and the wire number the other coordinate. Results are reported on the drifting of photoelectrons from the Cerenkov light and a light pulser over distances of 10 to 60 centimeters.