Sensitivity improvement of a Varian E‐109 EPR spectrometer with a low noise microwave amplifier

The installation of a low noise GaAsFET microwave preamplifier into a Varian E‐109 homodyne X‐band EPR spectrometer is described, and measurements of the resulting improvement in sensitivity as a function of microwave power are presented. Particular attention is paid to modification of the automatic...

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Veröffentlicht in:	Rev. Sci. Instrum.; (United States) 1988-05, Vol.59 (5), p.764-766
Hauptverfasser:	Dexheimer, S. L., Klein, M. P.
Format:	Artikel
Sprache:	eng
Schlagworte:	420800 - Engineering- Electronic Circuits & Devices- (-1989) 440300 - Miscellaneous Instruments- (-1989) AMPLIFICATION AMPLIFIERS CONTROL ELECTRONIC EQUIPMENT ENGINEERING EPR SPECTROMETERS Exact sciences and technology FREQUENCY CONTROL GAIN Infrared, submillimeter wave, microwave and radiowave instruments, equipment and techniques Instruments, apparatus, components and techniques common to several branches of physics and astronomy MEASURING INSTRUMENTS MICROWAVE AMPLIFIERS MICROWAVE EQUIPMENT OTHER INSTRUMENTATION Physics SENSITIVITY SPECTROMETERS Submillimeter wave, microwave and radiowave spectrometers magnetic resonance spectrometers, auxiliary equipments and techniques
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Zusammenfassung:	The installation of a low noise GaAsFET microwave preamplifier into a Varian E‐109 homodyne X‐band EPR spectrometer is described, and measurements of the resulting improvement in sensitivity as a function of microwave power are presented. Particular attention is paid to modification of the automatic frequency control (AFC) system to compensate for the preamplifier gain, which would otherwise result in instability of the AFC servoloop and decreased spectrometer performance at moderate microwave power levels. Specific details are provided for modification of the Varian E‐102 bridge, but the general approach is applicable to other spectrometers.
ISSN:	0034-6748 1089-7623
DOI:	10.1063/1.1139824