Understanding preventive behaviors among mid-Western African-American men: a pilot qualitative study of prostate screening

http://dx.doi.org/10.1016/j.jomh.2011.03.00

A Vacuum Tube Control Circuit for Cloud Chambers

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/71114/2/RSINAK-9-5-152-1.pd

TRIUMF brown reports TRI-69-6

This report describes the energy resolution to be expected from a 500 MeV H⁻ cyclotron for the following four cases: (1) Energy resolution of the raw beam, with no selection process in the cyclotron. (2) Energy resolution with low energy defining slits to limit the amplitude of radial oscillations. (3) Separated turn acceleration and extraction. (4) Selection of energy by determining three points on the final orbits (proposed by B.L. White.)TRIUMFNon UBCUnreviewedResearche

TRIUMF brown reports TRI-67-2

This report discusses the tolerances which beam dynamical requirements place on the accuracy to which the cyclotron magnet must be constructed and its magnetic field measured. The tolerance most significantly affecting manufacturing methods is probably that demanded of the spiral shape of the sectors to keep vertical focusing within acceptable limits. At large radii the precision required reaches ±0.033" and will necessitate a shimming programme subsequent to manufacture. The associated ±7 G tolerance on the field flutter should be easier to achieve. Isochronism sufficient to give 36% microscopic duty factor can be provided by a radial field gradient correct to ±2 G/ft together with 35 circular trim coils. Separated turn acceleration would require ±1 G/ft with 54 trim coils and very closely controlled dee voltage, radio frequency and magnet excitation. To avoid the poor energy resolution resulting from large radial betatron oscillations, the first harmonic field amplitude must not exceed 0.2 G; this demands 72 harmonic trim coils, ±0.14° accuracy in placing the sectors, and uniformity in their reluctance to 0.5%. Finally, to keep electric stripping of the H‾ ions within ±10% limits, the hill magnetic field must meet ±0.4% limits over the outer 20 in.TRIUMFUnreviewedResearche