The Lifetime and Decay Modes of Negative K Mesons Page: 11 of 55
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Negative particles that leave the 73-degree. target in the north-
west quadrant of the Bevatron in the forward direction relative to the
primary .proton beam are: deflected outward by the Bevatron magnetic
field, and those of appropriate momentum pass through a slot in the
magnet yoke. We attempted to separate K mesons from this "beam"
by using an energy degrader and an analyzing magnet.
. As a preliminary step the momentum spectrum .and exit angles
of thes.e particles were determined by plotting particle trajectories
representing various momenta.from the target position, using ,the
"mechanical. particle. " This device, a motor-driven tricycle, draws
a pen over magnetic-field.contours as the operator varies the angle of the
front wheel to maintain the proper radius of curvature., It .is an
improved model of one designed and built by Rankin, 1 differing only
in constructional details. The orbits showed that particles with
momenta in the band 435+20 Mev/c would pass through the slot,and
exit radially (within 3.deg) from the Bevatron. The 90 deg deflection
in the Bevatron field tends to focus particles horizontally, so that in
the median plane trajectories of particles of the same momentum leave
the Bevatron.approximately parallel. This is coupled with a slight
vertical defocus. Wire orbits through the quadrupole focusing magnet
showed that essentially all this beam could be focused, and determined
the current settings used.
A 180-deg focusing mnagne( gives, in addition to a. laL.ge angular
collection of particles, a momentum. gradient at the detector with a
point-to-point correspondence of momentum to radial position. We
particularly wished to avail ourselves. of this feature for the analyzing
magnet, because of the assistance it would lend to the analysis of
in-flight events. Special pole tips, designed to provide a field
capable of deflecting 300-Mev/c.particles through 180 deg on a radius
of 20 inches with a 6-inch gap, were built and installed in the 40-inch
Sagane magnet.. The median-plane field of this magnet was mapped with
a bismuth probe and rotating-coil gaussmeter so that the mechanical
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Nickols, N. A. The Lifetime and Decay Modes of Negative K Mesons, thesis or dissertation, September 1, 1959; United States. (https://digital.library.unt.edu/ark:/67531/metadc1015953/m1/11/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.