Frequency multiplication in high-energy electron beams Semiannual progress report, 1 Apr. - 1 Oct. 1967

High energy electron beam studies dealing with nonlinear analysis of beam-plasma interactions, cyclotron harmonic instabilities, and frequency multiplicatio

Microwave device investigations Semiannual progress report, 1 Oct. 1969 - 1 Apr. 1970

Beam-plasma interactions, cyclotron harmonic instability study, and millimeter and submillimeter wave detection by paramagnetic material

Microwave device investigations Semiannual progress report, 1 Apr. - 1 Oct. 1969

Summaries of progress in beam plasma interactions, paramagnetic and bulk semiconductor materials, and avalanche diode

Microwave device investigations Semiannual progress report, 1 Oct. 1968 - 1 Apr. 1969

Beam plasma amplification, harmonic generation, and coupling scheme

Frequency multiplication in high-energy electron beams Semiannual progress report, Oct. 1, 1966 - Apr. 1, 1967

Frequency multiplication in high energy electron beam

Microwave device investigations Semiannual progress report, 1 Apr. - 1 Oct. 1968

Beam-plasma interactions, cyclotron harmonic instabilities, harmonic generation in beam-plasma system, relativistic electron beam studies, and materials test

Frequency multiplication in high-energy electron beams Semiannual progress report, 1 Oct. 1967 - 31 Mar. 1968

Electron beam-plasma interactions, cyclotron harmonic instabilities, paramagnetic and semiconductor materials, and harmonic current generatio

Wave and particle measurements near the lower-hybrid frequency

Experimental results are presented on lower-hybrid waves excited in a plasma column by an electrostatic coupler. It is found that the observed wave patterns which clearly show resonance cones, are as predicted by a theory based on the superposition of bounded-plasma eigenmodes for a source with a wide kz spectrum and are also consistent with the WKB resonance-cone formulation. Results on electron heating and plasma loss produced by lower-hybrid waves are also presented.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/48950/2/ppv19i5p455.pd

Experimental study of parametric instabilities driven by finite-extent lower-hybrid waves

The lower-hybrid wave is an attractive candidate for the supplemental heating of Tokamak plasmas because of its engineering advantages in a reactor environment. It is estimated that 50 MW of supplementary r.f. heating power will be required to ignite a DT fusion reactor. At this power level the linear theory for lower-hybrid waves may be invalid, and one is forced to consider possible non-linear effects such as parametric instabilities. The authors present experimental results on the parametric decay of the lower-hybrid 'pump' wave into another lower-hybrid wave and a non-resonant 'quasi-mode', that is, a wave which is not a normal mode of the plasma.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/48954/2/ppv23i6p543.pd

Drop Test Release Mechanism

Many boxes for shipping undergo drop tests by the manufacturer to ensure their durability. Certain constraints are necessary to successfully carry out these tests such as not damaging the box prior to the drop and maintaining consistency throughout every drop. Our team has designed a Drop Test Release Mechanism that addresses these constraints. It provides repetitive drops for different objects that vary in shape and size such as small electronics or parts. This device utilizes a soft-clamping mechanism that can release an object with minimal force applied onto it prior to drop. A frame made of 80/20 was designed to provide rigidity to the soft-clamping mechanism. The soft clamping mechanism supports the object between it by utilizing foam and a friction pad to induce a high friction force. The clamp can be adjusted for multiple sized objects by use of sliding rails that allow it to widen or tighten. Our design focuses on just the release of the test object. A test stand to introduce varying heights must be designed for a fully functional drop test measurement process. The final prototype was tested to analyze the effectiveness of our design. The tests involved verifying the repeatability of the drop mechanism by testing the object to see if it fell in the same orientation and with the same impact each time. The drop mechanism passed these tests but failed at a usability test and an electronic test. The report goes into detail about the design and testing of the prototype