Varian Associates

About: Varian Associates is a based out in . It is known for research contribution in the topics: Beam (structure) & Amplifier. The organization has 2160 authors who have published 2591 publications receiving 46002 citations.

A method of selective ion trapping for quadrupole ion trap mass spectrometers

Abstract: A power efficient selective mass range trap filling process in which the RF trapping voltage (46) connected to the ring electrode (10) is slowly modulated simultaneously with: (1) e-beam ionization bombardment (41) and (2) application of a broadband supplemental waveform (49) containing selected secular frequencies to the QIT end caps (8, 9). The modulation (42) permits the reduction of the number of frequency components required in the broadband supplemental waveform (49) and permits elimination of absorption by ions of energy from more than one supplemental frequency component at any one time.

First 200 kW CW operation of a 60 GHz gyrotron

Abstract: The gyrotron is a microwave tube which employs the electron cyclotron maser interaction to produce high power output at millimeter wavelengths. It has important and growing applications for heating of plasmas in controlled thermonuclear fusion experiments. The Varian 60 GHz gyrotron has recently generated microwave power in excess of 200 kW during CW operation, with excellent dynamic range and operating stability. This is the highest average power ever produced by a microwave tube in the millimeter wave region. A description of the gyrotron design and test results are presented.

Automatic baseline compensator for optical absorption spectroscopy

Abstract: Apparatus and method are disclosed enabling automatic baseline compensation in a dual beam spectrophotometer. The wavelength adjustment mechanism of the instrument monochromator, is driven in step-wise fashion by a stepping motor or the like, which also drives the tape advance means of a magnetic tape recorder, whereby the tape is advanced past a read/write head in incremental steps with the advance of the wavelength adjustment mechanism. During a calibration run an error signal is generated, which signal indicates at each discrete wavelength whether the imbalance between the reference and sample signals is in a first (or "+") direction, or in a second (or "-" direction). The information conveyed by the error signal is written as a single "+" or "-" bit upon the tape during each step-wise movement of same. The signal comprised by the stream of successive bits is also integrated, and applied to an attenuator in the reference or sample signal channel, to reduce the imbalance, thereby flattening the baseline throughout the spectrophotometer range. During the sample run the bit stream is read-out from the tape and applied to the integrator, to adjust the attenuation in the selected channel, as to duplicate the baseline adjustments effected during writing of the bit stream upon the tape.