How to Make Full use of 100 fsec Pulses in a Diffraction/XAFS/Heating Experiment
Keith Brister
Northwestern University
100 fsec x-ray pulses present a opportunity to sense the instantanious state of a high pressure experiment: a 100 fsec pulse extends 30 microns along the beam path, matching the size of a typical diamond anvil cell sample chamber. This spatial resolution combined with the high repetition rate allows extension of high pressure techniques developed by Brister and Bassett, Rev Sci Instrum 66, 2698 (1995) for carbon dioxide laser pulses and energy dispersive diffraction by using modern detectors, lasers, and electronics. Laser heating pulses allow heating the sample to a higher temperature than can be achieved using CW techniques while area detector data can be sorted based on measured experimental conditions. The energy recover linac combined with avalanche photo diodes and pixel array detectors point to an exciting future for diamond anvil cell experiments.
