Measurement of transmitted phonon drag across 10 ohm cm ^>-type silicon indicates a phonon mean free path of the relevant thermal phonons which varies from about 80 n at 77°K to 12 /* at 250°K. The values depend on the method of evaluation. A simplified analysis suggests that below 150°K the longitudinal acoustic branch of the phonon spectrum is dominant.
The evolution of the concept and design of the Large Electron-Positron (LEP) storage ring between 1975 and 1989 is summarized. The development of the key components based on novel ideas is described and the performance of LEP at the different operational phases from the year 1989 to 2000 is outlined.
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