[en] In fast ramping synchrotrons like the Fermilab Booster the conventional methods of betatron tune evaluation from the turn-by-turn data may not work due to rapid changes of the tunes (sometimes in a course of a few dozens of turns) and a high level of noise. We propose a technique based on phasing of signals from a large number of BPMs which significantly increases the signal to noise ratio. Implementation of the method in the Fermilab Booster control system is described and some measurement results are presented.

[en] A console application using the phasing of Turn-by-Turn signals from the different BPMs has been tested at the Fermilab Booster. This technique allows the on-line detection of the beam tunes during the fast Booster ramp in conditions where other algorithms were unsuccessful. The application has been recently expanded to include the computation of the linear coupling coefficients. Algorithm and measurement results are presented. Although improved by the phased sum technique the automatic identification of the tunes is not always successful. This makes the use of the on-line application difficult. Ideas for further improvements are under investigation. Measurements have indicated that the effect of the skew quadrupoles is by a factor 3 weaker than expected from the nominal optics. A calibration of the skew quadrupole circuits using the TBT data is planned.

[en] A VME based data acquisition system has been designed and installed for use in the new 400 MeV line connecting the Linac and Booster at Fermilab. Position information is digitized at rates up to 5 MHz during the entire beam pulse. Triggering can be accomplished by any of several mechanisms, including beam synchronized clock events, Tevatron clock events or an external trigger based on the chopper power supply trigger. Scaling and averaging are done locally. The results are returned to the ACNET control system via the Token Ring network

[en] A number of GPIB-based instruments have been acquired for the antiproton production facility at Fermilab. In order to integrate such instruments into the accelerator control computer network (ACNET), a 68000-based CAMAC module has been designed and produced. ACNET commands and data are converted to ASCII strings by a software package called GAG residing in the module and are then sent from the module to instruments on the GPIB. (orig.)

[en] We are replacing the computers which support the CAMAC crates in the Fermilab accelerator control system. We want a significant performance increase, but we still want to be able to service scores of different varieties of CAMAC cards in a manner essentially transparent to console applications software. Our new architecture is based on symmetric multiprocessing. Several processors on the same bus, each running identical software, work simultaneously at satisfying different pieces of a console's request for data. We dynamically adjust the load between the processors. We can obtain more processing power by simply plugging in more processor cards and rebooting. We describe in this paper what we believe to be the interesting architectural features of the new front-end computers. We also note how we use some of the advanced features of the Multibus^TM II bus and the Intel 80386 processor design to achieve reliability and expandability of both hardware and software. (orig.)

[en] The recently installed beam position monitoring system designed for the Fermilab Booster is described. Signals from stripline pick-ups are processed by heterodyned AM-to-PM position circuitry which features wide dynamic range and normalized position outputs with wide bandwidth. Measurements are made to an accuracy of better than 1 mm over a 70 mm aperture with beam intensities ranging from less than 5E10 to more than 5E12 protons. An independent beam-synchronous timing system can track a fractional turn of beam through the cycle as the particle velocity nearly doubles. A Multibus/CAMAC data acquisition system interfaces 96 channels of closed orbit and single turn position information, and 4 channels of turn-by-turn position information, to the main control system

[en] This chapter reports the results from the p 20 GeV/c trigger performed at Fermilab. Prompt single muon results (350 GeV p-Fe) and prompt 2 + missing energy are considered. The new data provide a substantial improvement in the low momentum region and also allow a comparison of proton and pion induced prompt muon production. Density extrapolations were used to separate prompt muons from muons originating from the decays of long lived particles. The muon identifier identified all muons produced with a laboratory momentum greater than 5 GeV/c. Muon energies below 15 GeV were determined from their range in the muon identifier. Muon energies above 15 GeV were determined by use of toroidal magnets placed at the downstream end of the detector

[en] This paper describes the application programming written to facilitate deceleration of beam and associated studies in the Accumulator. The paper will include a description of the front-end programming, console programming for beam and tune control, console program for calculating, manipulating and loading deceleration ramps, and an automatic tune measuring program. In addition there is a program in a VME processor to control the RF oscillator. Operational experience with these programs will be described

[en] The authors have determined the value of the proton electromagnetic form factor in the time-like region at -q² = 12.6 (GeV/c)². The events p bar p → e⁺e^- from the data collected by the E760 experiment, performed at the Antiproton Accumulator Ring at Fermilab, were used. At the value of -q², assuming the possibility of neglecting the |G_E| contribution to the cross section, they found |G_M| = 0.0015 ± 0.003 and σ_TOT (p bar p →e⁺e^-) = 1.9 ± 0.8 pb. 10 refs., 3 figs

[en] The rates for same-sign and opposite-sign dimuon events with missing energy (indicative of final-state neutrinos) have been measured in 278 GeV π^--Fe and 350 GeV proton-Fe collisions. The main source of opposite-sign events is two semileptonic decays of hadronically produced charm states. The same-sign events are consistent with background from pion and kaon decays. We obtain a limit of 0.044 (90% CL) on the fraction of D⁰ semileptonic decays that result in the wrong-sign muon and conclude that less than 9% (90% CL) of same-sign dimuon events produced in neutrino interactions can be attributed to D⁰-anti D⁰ mixing. The data imply deltam < 6.5 x 10^-4 eV and deltalambda/lambda < 0.55 for the difference in mass and inverse lifetime of the CP eigenstates of the D⁰. Limits on diffractive bottom production cross sections in proton and pion collisions are also presented. (orig.)