163 research outputs found
Fundamental exercises for physical fitness,
No full text"This is a supplement to and includes selections from Corrective physical education for groups, by Lowman, Colestock and Cooper."Bibliography: p. 36.Mode of access: Internet
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Global ICRF modeling in large non-circular tokamak plasmas with finite temperature
No full textFull wave ICRF coupling calculations in two- and three dimensions have been extended to treat tokamaks with non-circular flux surfaces and conducting boundaries. The magnetic field configuration is derived from a Solovev equilibriium with finite poloidal magnetic fields. The conducting boundary may be of arbitrary shape. The mode conversion model is that of Colestock et al., in which the fourth order finite temperature wave equation is reduced to a second order equation which describes the effects of mode conversion on the fast wave but neglects the detailed structure of the ion Bernstein wave. Results show the effect of non-circular cross section on excitation, wave propagation, and absorption in Doublet III-D and JET. Also, in the limit of circular cross section, toroidal phasing of the resonant double loop antenna design for TFTR is studied
Annotated Bibliography of Elsie Singmaster’s Gettysburg Writings
No full textOur fellow Adams Countian, Elsie Singmaster Lewars (1879-1958), was a well -known author of regional fiction during the first half of the twentieth century. She wrote about the people and places she knew first hand. She spent most of her first twenty years in an ethnic Pennsylvania German community, Macungie, Pennsylvania. Having descended on her father’s side from Pennsylvania Germans who settled in the eastern part of the state beginning in the eighteenth century, she understood “her people” because she lived among them. When she began to write for publication in 1905, her first characters and plots drew upon her heritage. The early twentieth century interest in local color literature contributed to the initial popularity of her stories then published in American literary journals. Known professionally as Elsie Singmaster, she established a reputation as a skilled and sympathetic portrayer of Pennsylvania German life in a developing and diverse American culture
Anisotropic distribution function of minority tail ions generated by strong ion-cyclotron resonance heating
No full textThe highly anisotropic particle distribution function of minority tail ions driven by ion-cyclotron resonance heating at the fundamental harmonic is calculated in a two-dimensional velocity space. It is assumed that the heating is strong enough to drive most of the resonant ions above the in-electron critical slowing-down energy. Simple analytic expressions for the tail distribution are obtained fro the case when the Doppler effect is sufficiently large to flatten the sharp pitch angle dependence in the bounce averaged qualilinear heating coefficient, D/sub b/, and for the case when D/sub b/ is assumed to be constant in pitch angle and energy. It is found that a simple constant-D/sub b/ solution can be used instead of the more complicated sharp-D/sub b/ solution for many analytic purposes. 4 refs., 4 figs
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A generalized TRL algorithm for s-parameter de-embedding
No full textAt FNAL bench measurements of the longitudinal impedance of various beamline components have been performed using stretched wire methods. The basic approach is to use a network analyzer (NWA) to measure the transmission and reflection characteristics (s-parameters) of the beam line component. It is then possible to recover the effective longitudinal impedance from the s-parameters. Several NWA calibration procedures have been implemented in an effort to improve the accuracy of these measurements. These procedures are mathematical techniques for extracting the s-parameters of a test device from external NWA measurements which include the effect of measurement fixtures. The TRL algorithm has proven to be the most effective of these techniques. This method has the advantage of properly accounting for the nonideal calibration standards used in the NWA measurements
Effect of surface modes on coupling to fast waves in the LHRF
No full textThe effect of surface modes of propagation on coupling to fast waves in the LHRF is studied theoretically and experimentally. The previously reported up-down' poloidal phasing asymmetry for coupling to a uniform plasma is shown to be due to the properties of a mode which carries energy along the plasma-conducting wall interface. Comparison of the theory with coupling experiments performed on the PLT tokamak with a phased array of twelve dielectric-loaded waveguides at 800 MHz shows that the observed dependence of the net reflection coefficient on toroidal phase angle can be explained only if the surface wave is taken into account. 43 refs., 10 figs
Anisotropic distribution function of minority tail ions generated by strong ion-cyclotron resonance heating
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