| Third and Seventh Harmonic Free Electron Laser Coherent Millimeter Radiation, and Studies of Short-Pulse Emission from FEL |
DEC 97 |
41 pages |
| Authors:
T. C. Marshall; COLUMBIA UNIV NEW YORK DEPT OF APPLIEDPHYSICS
|
 | Two and one-half years research at the Columbia Free Electron Laser facility are are are summarized with an introductory overview followed by a selection of key reprints. Topics include: Short pulse high power millimeter emission using the Cerenkov effect in a dielectric-loaded waveguide, and coherent phase-reference harmonic radiation from a waveguide FEL. The latter is an experimental demonstration, while the first two topics are theoretical studies. |
|
| Theoretical and Experimental Research on a Millimeter-Wavelength Free- Electron Laser |
SEP 89 |
96 pages |
| Authors:
T. C. Marshall; COLUMBIA UNIV NEW YORK PLASMA PHYSICS LAB
|
| The Columbia Free Electron Laser is summarized with a selection of key reprints. Topics include: gain and wavelength studies, Thomson-scattering diagnostics for electron beam momentum-spread, efficiency-enhancement experiments, theory and experiments on optical guiding and sidebands. Papers describing the first results from our new FEL facility and other being a theory of beam temperature effects upon the gain of an FEL (one of the first of several such studies that have ... |
|
| Annual Technical Summary and Status Report on Contract N00014-79-C-0769(Columbia University, New York, New York) |
SEP 88 |
28 pages |
| Authors:
T. C. Marshall; CORNELL UNIV ITHACA N Y DEPT OF PHYSICS
|
| Observations of Optical Guiding in a Raman Free-Electron Laser; Evidence for optical guiding of 1.7-mm-wavelength radiation along an electron beam in a Raman free-electron laser is obtained experimentally and compared with numerical simulations. Optical guiding is manifest as the interference effect of several waveguide modes; this is observed beyond the point of electron-beam termination. The experiment operates in the regime of exponential signal gain and appreciable electron-beam space ... |
|
| A Raman FEL (Free Electron Laser) at 2mm Wavelength. Design of an Efficiency-Enhanced Raman FEL Oscillator |
OCT 85 |
|
| Authors:
J. Masud; F. G. Yee; T. C. Marshall; S. P. Schlesinger; DARTMOUTH COLL HANOVER NH
|
 | The nonlinear physics of the free electron laser (FEL) involves waves set up in a nearly cold electron beam when it passes through the undulator. In addition to the pump field and the growing scattered EM wave moving parallel to the electrons, there is a disturbance in the beam space charge caused by the ponderomotive force. In this paper we discuss initial experimentation using a simple Raman oscillator and amplifier. ... |
|
| Studies on the Inhalation Toxicity of Dyes Present in Colored Smoke Munitions. Phase II Studies: Range Finding and Toxicokinetics Studies of Inhaled Dye Aerosols |
15 MAR 85 |
84 pages |
| Authors:
Rogene F. Henderson; J. S. Dutcher; F. F. Hahn; D. E. Bice; T. C. Marshall; ARMY MEDICAL RESEARCH AND DEVELOPMENT COMMAND FORT DETRICK MD
|
| The USAMBRDL has an interest in the potential inhalation toxicity of yellow dye (SY) and a yellow/green dye mixture (SY/SG) used in colored smoke munitions. In the rangefinding studies, no mortalities or life-threatening lesions were observed in rats exposed for as long as 6 hours per day for 5 days to airborne concentrations greater than 1 g/cu m of either SY or SY/SG. The particle size of the aerosols employed ... |
|
| Studies on the Inhalation Toxicity of Dyes Present in Colored Smoke Munitions. Phase III, Studies: Four-Week Inhalation Exposures of Rats to Dye Aerosols |
10 SEP 84 |
68 pages |
| Authors:
D. E. Bice; Y. S. Cheng; J. S. Dutcher; F. F. Hahn; T. C. Marshall; LOVELACE BIOMEDICAL AND ENVIRONMENTAL RESEARCH INST ALBUQUERQUE NM INHALATION TOXICOLOGY RESEARCH INST
|
| The USAMBRDL has an interest in the potential inhalation toxicity of yellow dye (SY) and a yellow/green dye mixture (SY/SG) used in colored smoke munitions. Rats were exposed by inhalation to aerosols of SY or SY/SG generated in a respirable particle size range for 6 hr/day, 5 days/week for 4 weeks. Nominal exposure concentrations selected for both dye exposures were 0, 10, 50, and 250 mg/cum. Animals exposed to the ... |
|
| Thomson Backscattering from an Intense Relativistic Electron Beam as a Diagnostic for a Free Electron Laser |
APR 1984 |
|
| Authors:
S. C. Chen; T. C. Marshall; COLUMBIA UNIV NEW YORK PLASMA PHYSICS LAB
|
| The parallel momentum spread of an intense relativistic electron beam (1 KA/CC, 700 KV) used in a Raman free electron laser, is determined by a Thomson backscattering experiment. Theory is reviewed to show that the relativistic effect combines with the backscattering geometry to provide maximum energy resolution, sensitivity, and scattered signal level for the energy diagnostic experiment. The electron beam is field-emitted from a cold cathode, apertured by the anode, ... |
|
| Studies on the Inhalation Toxicity of Dyes Present in Colored Smoke Munitions. Phase I Studies: Generation and Characterization of Dye Aerosol |
01 FEB 1984 |
59 pages |
| Authors:
R. F. Henderson; Y. S. Cheng; J. S. Dutcher; T. C. Marshall; J. E. White; LOVELACE BIOMEDICAL AND ENVIRONMENTAL RESEARCH INST ALBUQUERQUE NM INHALATION TOXICOLOGY RESEARCH INST
|
| The USAMBRDL has an interest in the potential inhalation toxicity of yellow dye (SY) and a yellow/green dye mixture (SY/SG) used in colored smoke munitions. A method for generation of respirable size particles of SY and SY/SG dye materials for inhalation toxicity studies with these dyes has been developed. |
|
| High Power Submillimeter and Infrared Radiation from Intense Relativistic Electron Beams |
DEC 1982 |
|
| Authors:
T. C. Marshall; S. P. Schlesinger; COLUMBIA UNIV NEW YORK DEPT OF APPLIED PHYSICS AND NUCLEAR ENGINEERING
|
| Free-electron lasers are investigated for obtaining coherent radiation in the submillimeter and infrared portions of the spectrum. (Author) |
|
| High Power Submillimeter and Infrared Radiation from Intense Relativistic Electron Beams |
1981 |
|
| Authors:
S. P. Schlesinger; T. C. Marshall; P. Diament; COLUMBIA UNIV NEW YORK DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| The first quarter of Calendar 1980 was spent installing and testing the newly acquired long-pulse well-regulated Physics International Pulserad 220 unit (1 Mev. 20 KA 100 nsec). The balance of the year was spent on the first phase of the FEL long pulse oscillator experiment and the beginnings of an investigation of the FEL amplifier. Wavelength and power were measured as a function of electron energy and current. Theoretical work ... |
|
| High Power Submillimeter and Infrared Radiation from Intense Relativistic Electron Beams. |
MAR 1980 |
|
| Authors:
S. P. Schlesinger; T. C. Marshall; P. Diament; COLUMBIA UNIV NEW YORK DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| A series of experiments was performed to test the dependence of superadient power generated by stimulated Raman backscattering (at 2 mm wavelength) upon ripple-field amplitude and length. Experiments were also performed to understand the possibility of using distributed feedback in a collective mode free electron laser. A theoretical study was completed to understand the growth of circular waveguide modes by parametric coupling to cold beam waves, with field gradients included. ... |
|
| A High-Power, Free-Electron Laser Based on Stimulated Raman Backscattering. |
16 FEB 1979 |
|
| Authors:
D. B. McDermott; T. C. Marshall; R. K. Parker; S. P. Schlesinger; V. L. Granatstein; NAVAL RESEARCH LAB WASHINGTON D C
|
| A free electron laser using an intense relativistic electron beam in a rippled magnetic field has been operated in the stimulated Raman scattering regime to yield megawatt-level radiation at submillimeter wavelengths; line-narrowing to Delta lambda/lambda approximately 2% is reported. (Author) |
|
| MOLECULAR STORAGE AND TRANSFER OF ELECTROMAGNETIC ENERGY IN GASEOUS PLASMAS. |
APR 1964 |
|
| Authors:
T. C. Marshall; R. A. Kawcyn; E. A. McLennan; J. Berlande; L. Goldstein; ILLINOIS UNIV URBANA ENGINEERING EXPERIMENT STATION
|
| A laboratory study of the generation and recombination of atoms is presented. The background information consists of a discussion of various methods for producing atoms of nitrogen, oxygen and hydrogen by electrical discharges, with primary emphasis placed on the use of intense microwave electric fields. The body of the report deals with the results of investigations into the various loss mechanisms and reactions which affect the experimental use of atoms. ... |
|
Reports by Author
