T. Y. Ling

A liquid-scintillator total-absorption hadron calorimeter for the study of neutrino interactions

Abstract We describe the performance of a large-volume liquid-scintillator calorimeter which has been used to measure the total energy of hadrons produced by interactions of neutrinos with nucleons. The resolution of the calorimeter is about 12% rms for incident pions over the energy range 20–150 GeV, and about 15% for neutrino-induced hadron systems in the chosen fiducial volume after corrections for imperfect energy containment.

Results of radiation test of the cathode front-end board for CMS endcap muon chambers

Abstract After a brief overview of the CMS EMU electronics system, results on radiation induced single event effects, total ionization dose and displacement effects will be reported. These results are obtained by irradiating the components on electronics boards with 63 MeV protons and 1 MeV neutrons. During the proton irradiation, the electronics board was fully under power, all components on the board were active and the data were read out in the same way as designed for CMS. No deterioration of analog performance for each of the three CMOS ASICs on the tested board was observed, up to a dose of 10 krad . Each of the tested FPGAs survived beyond the dose of 30 krad . No single event latch-up was detected for the CMOS ASICs up to a proton fluence of 2×10 12 cm −2 . Single Event Upsets (SEU) in FPGAs were detected and their cross-sections measured. SEU mitigation with triple module redundancy and voting was implemented and tested.

Optical readout components for the ZEUS barrel calorimeter

Abstract The design, construction and testing of the optical components of the ZEUS barrel calorimeter are described.

Tests of Cathode Strip Chamber Prototypes

Abstract We report on the results of testing two six-layer 0.6 × 0.6 m 2 cathode strip chamber (CSC) prototypes in a muon beam at CERN. The prototypes were designed to simulate sections of the end-cap muon system of the Compact Muon Solenoid (CMS) detector which will be installed at the Large Hadron Collider (LHC). We measured the spatial and time resolutions of each chamber for different gains, different orientations with respect to the beam direction and different strength magnetic fields. The single-layer spatial resolution of a prototype with a strip pitch of 15.88 mm ranged from 78 to 468 μm, depending on whether the particle passed between two cathode strips or through the center of a strip; its six-layer resolution was found to be 44 μm. The single-layer spatial resolution of a prototype with a strip pitch of 6.35 mm ranged from 54 to 66 μm; its six-layer resolution was found to be 23 μm. The efficiency for collecting an anode wire signal from one of six layers within a 20 ns time window appropriate for the LHC was found to be greater than 95% in normal running conditions.

Limits on ν¯μ→ν¯e oscillations

The result of a search for the neutrino oscillation mode nu-bar/sub ..mu../..-->..nu-bar/sub e/ in a fine-grained tracking detector is reported. The average neutrino energy is 40 MeV and the average detector distance from the neutrino source is 26.8 m. No evidence for neutrino oscillations through this mode is observed. Limits on deltam/sup 2/ and sin/sup 2/(2theta) are presented.

A large-area magnetic spectrometer for the study of high-energy neutrino interactions

Abstract We describe the design, construction, and performance of a large solid iron magnetic spectrometer which has been used to i dentify and measure the momentum of muons produced by interactions of neutrinos with nucleons. The rms momentum resolution varies from 10 to 15 percent between 5 and 150 GeV/ c .

Design features and test results of the CMS endcap muon chambers

Abstract Presented are the main design features and performance results of the Cathode Strip Chambers for the CMS Endcap Muon system. Although the strips are unusually wide (up to 16 mm ) for the cathode-to-anode wire distance of 5 mm , the six-plane structure of these chambers yields a spatial resolution of about 80 μm , essentially uniform and independent of the strip width. In addition, the net spatial resolution of about one-tenth of the strip width at the hardware trigger level (300 ns ) is obtained using a simple network of comparators. Time resolution achieved at the trigger level is ∼4 ns (rms) that allows unambiguous tagging of bunch crossings which occur every 25 ns . Aging test results, including those obtained with a recirculating gas system, are discussed; only minor aging affects were observed. The aging studies were performed with large-scale chambers; 700 m of wire were irradiated for a dose up to 0.4 C / cm of the total accumulated charge.

A resonance measuring wire tension monitor for high-energy physics

The design, construction, and operation of a wire tension monitor is presented. The technique used is unique in that the electric force is used to excite the wire into harmonic resonance. The amplitude of the wire is in turn monitored using the variation of the oscillating wires capacitance measured by a resonance circuit. Finally, the resonance is found electronically using phase lock loop techniques. Wire tension is measured to an accuracy of 0.3% with this device. >

A fast cluster finding processor for the ZEUS calorimeter

Abstract The design, construction and operation of a fast cluster finding processor for the ZEUS calorimeter is described.

A scintillating fiber design for a ZEUS barrel calorimeter shower maximum detector

Abstract The design, construction and testing of a prototype scintillating fiber shower maximum detector for the ZEUS barrel calorimeter is described.