Browsing by Author "Cranshaw, Jack Mark"

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    The lambda trigger for the E704 Forward Spectrometer
    (1991) Cranshaw, Jack Mark; Roberts, Jabus B.
    The E704 Forward Spectrometer was designed to detect the inclusive production of hyperons ($\Lambda\sp0, \Sigma\sp0$) by a 200 GeV/c polarized proton beam incident upon an unpolarized liquid hydrogen target. This measurement used a four level trigger to detect lambdas, both from direct production and from $\Sigma\sp0$ decay. This trigger used four hodoscopes and two levels of programmable logic. The correlations fed into the programmable logic (Memory Lookup Units and Programmable Logic Units) were calculated using a GEANT3 Monte Carlo program. The trigger was tested and then used during the 1990/91 fixed-target run at Fermilab. It was gradually refined during the run. We were eventually able to see lambdas, but the reconstruction rate was low due to tracking limitations, chamber inefficiencies, background processes, etc.
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    The SMC muon-electron elastic scattering polarimeter
    (1995) Cranshaw, Jack Mark; Roberts, Jabus B.
    The Spin Muon Collaboration was formed to measure the spin dependent structure function $g\sb1$ of both the proton and the neutron. This was done by scattering polarized muons off of polarized protons or deuterons. The results provided a test of three sum rules: the Ellis-Jaffe sum rule for the proton, the Ellis-Jaffe sum rule for the neutron, and the Bjorken sum rule. Two polarimeters were used to measure the beam polarization. The polarimeter discussed in this thesis used elastic scattering from polarized electrons to measure the muon beam polarization. It gave a result in agreement with both the previous measurement using muon decay and a simulation of the beamline. These measurements helped reduce the systematic error on the measurement and improve the measurements of the sum rules. The results from the experiment showed that both Ellis-Jaffe sum rules were violated while the Bjorken sum rule was confirmed.