17 research outputs found
Observation of mesoscopic effects in Schottky diodes at 300 K when used as mixers at THz frequencies
Infrared Free-Electron Laser Measurement of the Photon Drag Effect in P-Silicon
We report the use of FELIX (free electron laser for infrared experiments) to study photon drag in p-silicon over the wavelength range 25-80-mu-m. Previous 'spot' measurements using a pulsed water vapour laser had indicated high response at 28 and 33-mu-m associated with transitions within the valence band. These earlier results have been confirmed and the main futures of the extended photon drag spectrum are also explainable by reference to the valence band structure. A practical outcome of the experiment is the design of a subnanosecond response time detector to observe the 1GHz frequency micropulse output from FELIX
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First Measurements of the Longitudinal Bunch Profile at SLAC Using Coherent Smith-Purcell Radiation at 28GeV
Coherent Smith-Purcell radiation has been demonstrated as a technique for measuring the longitudinal profile of charged particles bunches in the low to intermediate energy range. However, with the advent of the International Linear Collider, the need has arisen for a non-invasive method of measuring the bunch profile at extremely high energies. Smith-Purcell radiation has been used for the first time in the multi-GeV regime to measure the longitudinal profile of the 28GeV SLAC beam. The experiment has both successfully determined the bunch length, and has also demonstrated its sensitivity to bunch profile changes. The challenges associated with this technique, and its prospects as a diagnostic tool are reported here
Observation of coherent millimeter and sub-millimeter emission from a mocrotron driven Cernekov-FEL
Submitted to Phys.Rev.LettsSIGLEITItal