Spectrometer electromagnet power supplies

TD-NMR and HR-NMR spectrometer systems have a majority of components in common. All spectrometers consist of a magnet, magnet temperature sensors, magnet heater power supply, RF frequency synthesizer, pulse programmer, transmitter/amplifier, sample probe, duplexor, preamplifier, receiver, and ADC, all controlled by a computer. In addition to these items a HR-NMR has several other requirements which include an electromagnetic shim set, a shim power supply, and a second RF locking channel tuned to the resonance frequency of Li. The second RF channel is identical to that of the observed H channel. Figures 10.9 and 10.10 show the basic setup of TD-NMR and HR-NMR spectrometers, respectively. 

A sector mass-spectrometer is built to scan to mje = 500 with the maximum field of the electromagnet at 6000 gauss and an accelerating voltage of 3000 V. To examine the molecular ion of a compound of molecular mass 850, what modification in the accelerating-voltage power-supply is required ... 

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