The client submitted 5 sets of porcelain and stoneware subsurface (radioactive site) marker prototypes (31 markers each set). The following were determined: compressive strength, thermal shock resistance, thermal crazing resistance, alkali resistance, color retention, and chemical resistance.

For some time now, the sources of RF transverse beam steering in the SLAC Linac have been a mystery. The previously known sources, coupler asymmetries and survey misalignment, have predicted deflections which are frequently much smaller than the observed deflections. A new source of RF steering has been discovered: the tilting of accelerator irises. Measurements of iris tilting in a forty foot accelerator girder are compared with measurements of RF beam deflections and are found to be strongly correlated. 4 refs., 6 figs., 3 tabs.

We have developed a LSI-11/23 computer-driven CAMAC data acquisition system. The 64 silicon-detector system is being used to investigate the alpha and spontaneous fission activities of short-lived transfermium isotopes by the real-time monitoring of the mother-daughter alpha decay sequence. A unique modular pulse processing electronics system was designed to simplify set up and calibration. The computer adjusts the gain of the CAMAC shaping amplifiers enabling the calibration and alignment of all 64 of the 1 k alpha spectra to within 0.5 channel in less than 10 minutes.