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Extra resources for Electroweak Coupling Measurements at the Z0 Resonance [thesis]
The detectors arrays were constructed from 300 ( f 1 0 ) ,urn high resistivity n-type silicon wafers with a p-type ion-implantation from the front surface to form the junction diode. The physical gap between adjacent pads on one silicon chip is less than 300 pm. The actual inactive gap is much smaller than this. After the silicon wafers were trimmed, Hamamatsu mounted the 20 cell detector on a printed circuit daughterboard with conductive epoxy. The daughterboard provides increased mechanical strength and the necessary electrical contact areas.
The electrons are brought into collision with the laser approximately 40 meters after the e+e- collision point. 9 Hz, coinciding with every eleventh SLC pulse. Data from every laser-beam crossing are used to measure the electron beam polarization. A statistical error of 1-2% is achieved in a three minute run. The Compton data is shipped to the SLD data acquisition system and written to tape asynchronously with the triggered data from the other subsystems. It should be noted that the helicity of each pulse is transmitted by means of redundant lines from the Polarized Electron Source directly to both the SLD acquisition system and the Compton polarimeter on a pulse-by-pulse basis.
35 The Endcap Drift Chambers have wires running perpendicular to the beamline for track reconstruction at smaller angles. 2). Backgrounds from the SLC as well as material in front of the EDCs have thus far hampered their ability to find charged tracks. 2 Particle Identification When the velocity of a particle exceeds the speed of light in a medium, the particle emits Cerenkov radiation. The Cerenkov angle is related to the velocity of the particle. From the measurement of the Cerenkov angle, coupled with momentum information from the drift chamber, the mass of the particle and hence the identity of the particle can be ascertained.