[en] The authors have measured ratios of single hadrons produced at high p/sub T/ in 400 GeV/c proton-hydrogen and proton-deuterium collisions. A Ring Imaging Cherenkov detector was employed to identify π/sup +/-/, K/sup +/-/, p and anti-p in the momentum range 80-150 GeV/c. Our acceptance was defined by the region 5.0 < p/sub T/ < 8.0 GeV/c and 65 < theta/sup */ < 95⁰. The authors compare the measurements of the ratios K⁺/π⁺, p/π⁺, K^-/π^-, anti-p/π^-, and π⁺/π^- to the results of the Chicago-Princeton experiment and to the Lund high p/sub T/ physics Monte Carlo

[en] The endfield is often one of the most critical regions in conventional accelerator magnets. While the magnetic field structure of dipole ends can be complicated, it can be well described by a few parameters which include the effective magnetic length, L_eff, and the integrated harmonics. Both of these parameters can be measured using a rigid coil which measures ∫ Bdl in the endfield region as a function of insertion depth z and transverse displacement x. We employ a data analysis technique which uses these measurements to remove body field contributions to the end field integral, resulting in the effective integrated endfield shape. A least squares polynomial fit is then used to estimate the harmonic coefficients up to decapole. We also present the technique for measuring L_eff as a function of magnet current. These measurement techniques were successfully used in a study to finalize the design of the endpacks for the Fermilab Main Injector Dipole. The techniques are sufficiently general to be useful for other applications, such as the testing of the SSC Medium Energy Booster endpacks

[en] Measurements of the transverse dependence of the flux on the symmetry plane were obtained on a series of endpacks mounted on a Main Injector prototype dipole. From these flux measurements, we determined the endfield shape, expressed in terms of normal harmonics, up to 14-pole. We describe the measurement and analysis procedure, and present the results for all endpacks that were tested. The final endpack (number 10) has a sextupole, normalized to the body, of +0.167 ± .072 units, and the relative field shape deviates by < 1.2 units relative to the on-axis field strength over the range |x| < 2.0 double-prime. These measurements indicate that Endpack 10 meets the requirements for the Main Injector dipole

[en] We describe the procedures used by the Fermilab Magnet Test Facility (MTF) to perform tests of dipoles to be installed in the beam lines of the Loma Linda University Medical Center Proton Therapy Facility. The dipoles were manufactured in two styles, one style having a 45 degree bending angle and the other a 135 degree bending angle. The tests included magnetic field measurements using a Hall probe and the measurement of coil temperatures, voltages, and water flow rates. The probe was mounted on a movable cart which could be wheeled along the magnet beam pipe; we mounted extensions onto each end of the beam pipe to allow for the probe to measure the magnet end fields. The probe was also mounted at varying transverse positions on the cart to allow for field shape measurements, from which body quadrupole and sextupole coefficients were determined. A longitudinal sampling of the field down the entire length of the magnet allowed us to measure the total integrated field of each magnet. Hall probe measurements were controlled by a C program running on a Unix workstation

[en] The 8 GeV transfer line feeding protons into the new Fermilab Main Injector has been built using strontium ferrite permanent magnets. This article addresses the design and manufacture of the 67 combined function magnets; permanent horizontal and verticle bend dipoles and quadrupoles were also built. The combined function magnets were built with a mean integrated strength at midaperture of 0.56953 T-m (central field nominally 0.15 T), and a gradient of 3.23% per cm relative to the dipole strength (nominal gradient = 0.48 T/m). Thermal compensation of these bricks was effected by use of a nickel-iron alloy. The magnets were thermally cycled from 20 degrees C to 0 degrees c to condition the ferrite against irreversible thermal losses; the compensation was measured with a flipcoil and verified with a rotating harmonics coil. We present details of the magnet assembly process and also summarize the magnetic measurements

[en] At the Fermilab Magnet Test Facility (MTF) measurements of magnet field shape and strength have been performed. The tracking of the Fermi Main Injector (FMI) lattice requires a detailed knowledge of the magnetic field quality and its variation from magnet to magnet. As of this date only two prototype dipole magnets have been built, not enough to do a statistical analysis. For this purpose we have used old Main Ping dipole measurements. Measurements on a subset of Main Ring (MR) quadrupoles are also available. From the different sets of measurements available to us we have separated in our simulation the end multipoles from the body multipoles. Such a dissection of the magnet enables us to study more closely the effects of the end multipoles on the performance of the Main Injector. In particular we have studied the closed orbit errors due to variations in effective length of the long and short type dipoles. Tables of multipole errors are presented at both injection (8.9 GeV/c) and slow extraction (120 GeV/c) energies

[en] The endfield is often one of the most critical regions in conventional accelerator magnets. While the magnetic field structure of dipole ends can be complicated, it can be well described by a few parameters which include the effective magnetic length, L_eff, and the integrated harmonics. Both of these parameters can be measured using a rigid coil which measures ∫Bdl in the endfield region as a function of insertion depth z and transverse displacement x. The author employs a data analysis technique which uses these measurements to remove body field contributions to the end field integral, resulting in the effective integrated endfield shape. A least squares polynomial fit is then used to estimate the harmonic coefficients up to decapole. The author also presents the technique for measuring L_eff as a function of magnet current. These measurement techniques were successfully used in a study to finalize the designs of the endpacks for the Fermilab Main Injector Dipole. The techniques are sufficiently general to be useful for other applications, such as the testing of the SSC Medium Energy Booster endpacks

[en] Trials have compared image quality using receiver operating characteristic (ROC) curves for different digitization resolution, particularly on hard copy. Resolution required for such systems is critical. Monitor quality significantly affects results of such studies. Several ''high-quality'' monitors were tested for gray level uniformity, flicker, resolution, stationarity (including distortion), jitter, and stability with time. An ROC study has demonstrated that such errors, on one commercially available system, were large enough to degrade image display at both 1k x 1k and 2k x 2k matrix sizes. Flicker was very disturbing with difficult images. Greater attention to these factors is required in designing (and evaluating) picture archiving and communication system work stations

[en] The transfer line that will serve to transport 8 GeV protons from the Booster to the new Fermilab Main Injector has been built using permanent magnets. A total of 46 horizontal bend dipoles and 5 vertical bend dipoles were built for this beamline; 67 gradient magnets were also built. The magnets were built using magnetized strontium ferrite bricks. Thermal compensation of these bricks was effected by use of a nickel-iron alloy. The dipole magnets were built with a mean integrated strength of 0.56954 T-m, and an rms spread of 0.06%. The magnets were thermally cycled from 20 degrees C to 0 degrees C to condition the ferrite against irreversible thermal losses, and the compensation was measured with a flipcoil. The magnet strength was adjusted by varying the number of bricks installed at the magnet ends. Details of the assembly process and a summary of magnetic measurements are presented here

[en] The authors describe the procedures used by the Fermilab Magnet Test Facility (MTF) to perform tests of dipoles to be installed in the beam lines of the Loma Linda Univ. Medical Center Proton Therapy Facility. The dipoles were manufactured in two styles, one style having a 45 degrees bending angle and the other a 135 degrees bending angle. The tests included magnetic field measurements using a Hall probe and the measurement of coil temperatures, voltages, and water flow rates. The probe was mounted on a movable cart which could be wheeled along the magnet beam pipe; they mounted extensions onto each end of the beam pipe to allow for the probe to measure the magnet end fields. The probe was also mounted at varying transverse positions on the cart to allow for field shape measurements, from which body quadrupole and sextupole coefficients were determined. A longitudinal sampling of the field down the entire length of the magnet allowed the authors to measure the total integrated field of each magnet. Hall probe measurements were controlled by a C program running on a Unix workstation