J. Krider

The design, construction and performance of the MICE scintillating fibre trackers

Charged-particle tracking in the international Muon Ionisation Cooling Experiment (MICE) will be performed using two solenoidal spectrometers, each instrumented with a tracking detector based on 350 mu m diameter scintillating fibres. The design and construction of the trackers is described along with the quality-assurance procedures, photon-detection system, readout electronics, reconstruction and simulation software and the data-acquisition system. Finally, the performance of the MICE tracker, determined using cosmic rays, is presented

Residual gas beam profile monitor

Abstract The design and performance of a beam profile monitor which presents no material to the beam is described. The detector, which has a 75 mm active width, operates from residual gas in the beam vacuum system. It provides 1 mm rms spatial resolution and 1 ms time resolution in a 1 μA beam at 10−7 Torr. Using a microprocessor based scanning ADC, a sequence of ten profiles can be acquired in as little as 100 ms. The monitor could be applied in other stored or extracted beams where the amount of material seen by the beam must be minimized.

A regenerable filter for liquid argon purification

A filter system for removing electronegative impurities from liquid argon is described. The active components of the filter are adsorbing molecular sieve and activated-copper-coated alumina granules. The system is capable of purifying liquid argon to an oxygen-equivalent impurity concentration of better than 30 parts per trillion, corresponding to an electron drift lifetime of at least 10 ms. Reduction reactions that occur at �250 ◦ C allow the filter material to be regenerated in-situ through a simple procedure. In the following work we describe the filter design, performance, and regeneration process.

A multiwire secondary emission beam profile monitor with 20 μm resolution

Abstract A 20 μm resolution multiwire beam profile monitor has been designed for the Fermilab antiproton source. The monitor consists of closely packed wires operating by secondary emission (SEM).

Design and test results of a transition radiation detector for a Fermilab fixed target rare kaon decay experiment

Abstract A transition radiation detector with large aperture (2.2 m width × 2.2 m height) has been designed and optimized to provide π e rejection of at least 120 : 1 in a rare kaon decay experiment (E799) at Fermilab. The momentum range of interest is between 2 and 25 GeV/c. Beam test results with a small prototype wire chamber with different radiators and conventional gas mixtures are shown.

Synchrotron radiation detectors for tagging electrons

Abstract The design of two synchrotron radiation detectors, one using a barium fluoride (BaF 2 ) crystal and the other using a bismuth germanate (BGO) crystal, is described, and test results are presented. The detectors have been used to tag positrons or electrons in a secondary beamline at Fermilab. BaF 2 has a decay time of 0.6 ns, so it can be used in higher intensity beams that BGO, which has a decay time of 300 ns.

Hadroproduction of χc states in 530 GeV/c π− interactions with nuclear targets

We are studying production of χc states in 530 GeV/c π− interactions with several targets. χc mesons are observed in the mode (χ→J/ψ+γ). Only photons that converted to e+e− pairs are used in the reconstruction of the χc mesons. Preliminary analysis shows that the fraction of observed J/ψs coming from χc radiative decays is 0.44±0.09±0.08, and that the relative production rate of χc1 to χc2 is 1.3±0.6.

Production ofJ/ψmesons inpBecollisions at 530 and800GeV/c

We report on the production of J/psi mesons in 530 and 800 GeV/c proton - Be collisions in the Feynman-x range 0.0 < xf < 0.6. The J/psi mesons were detected via decays into opposite sign muon pairs. Differential distributions for J/psi production have been measured as functions of xf, pT^2, and cosine of the Gottfried-Jackson decay angle. These distributions are compared with results on J/psi production obtained in 515 GeV/c pion - Be collisions, measured by the same experiment, as well as with results from other experiments using incident protons.

Production of

We report on the production of J/psi mesons in 530 and 800 GeV/c proton - Be collisions in the Feynman-x range 0.0 < xf < 0.6. The J/psi mesons were detected via decays into opposite sign muon pairs. Differential distributions for J/psi production have been measured as functions of xf, pT^2, and cosine of the Gottfried-Jackson decay angle. These distributions are compared with results on J/psi production obtained in 515 GeV/c pion - Be collisions, measured by the same experiment, as well as with results from other experiments using incident protons.

J/\psi

The presentation on ion profile monitors using microchannel plates consists of two principal parts. The first part describes the design and performance of a profile monitor that was installed in the Debuncher Ring of the Antiproton Source at Fermilab. The information presented relies to a large extent on the contents of a previously published article describing that project [1]. The second part of the presentation describes work in progress on a turn‐by‐turn profile monitor for the Fermilab Booster. A written description of that work is included elsewhere in these proceedings [2].