No abstract

Providing high quality light to users in a consistent and reliable manner is one of the main goals of the accelerator physics group at the Advanced Light Source (ALS). To meet this goal considerable time is spent monitoring the performance of the machine. At the Group's weekly meeting the performance of the accelerator over the previous week's run is reviewed. This paper describes the parameters that are monitored to optimize the performance of the ALS.

No abstract

The dosimetry of both x+ and x--beams, by use of semiconductor detectors and plastic scintillators, is described. Depth-dose distributions, isodose distributions and integral and differential range curves are present'ed. By use of a time-of-flight system, the dosimetric information for a pure pion beam is obtained. The muon and electron contamination reduce the peak-to-plateau rat'io. Pion beams of low energy give better depth-dose distributions. Nearly 507; of the dose a t the peak of the depth-dose dist'ribution of a x--beam is found to be due to nuclear events. Depth-dose distributions measured by semiconductor detector and tissue-equivalent ionization chamber, are in close agreement with each other.* Machines that will produce pion intensities nearly two or three orders of magnitude higher than the one presently available are under construction at Los Alamos Scientific Laboratory ; Vancouver, Canada ; and Zurich, Switzerland.