Mode Coupling and the Significance of the Helical Beam-     Electron Trajectories in Gyrotrons
{'Code': '07010000', 'Directorate': {'Abbreviation': 'ENG', 'LongName': 'Directorate For Engineering'}, 'Division': {'Abbreviation': 'ECCS', 'LongName': 'Div Of Electrical, Commun & Cyber Sys'}}
{'SignBlockName': 'Lawrence Goldberg', 'PO_EMAI': None, 'PO_PHON': None}
This work is funded as an Engineering Initiation Award (EIA).           The objective is to investigate the effects due to the helical beam             electron trajectories in the electron cyclotron maser.  Using a Maxwell-        Vlasov theory and the telegraphist equations, the maser interaction from        a cold tenuous annular electron beam in a lossy cylindrical waveguide           (gyrotron amplifier) and a complex cavity (gyrotron oscillator) is to be        analytically examined.  Coupling among the beam, the higher order TE(mn)        mode and space charge effects (to a first approximation, the TM(rs)             mode) in the gyrotron amplifier is expected to be demonstrated at all           frequencies, including the fundamental and harmonic cyclotron                   frequencies.  The significance of the TM(rs) mode is to be examined.            Growth rate and amplitude threshold dependence on the magnetostatic             guide field, wall radius and wavenumber will also be examined.  Mode            coupling and competition will be analyzed in a gyrotron oscillator              comparable to experiment.  Field correctly satisfying boundary                  conditions will be used. From a total power analysis of the Beam-wave           interaction, the significance of a parasitic TE mode or a space charge          TM mode will be investigated.  Understanding these coupling effects will        provide more efficient, accurate and possibly more flexible gyrotron            designs.  The theory has potential for futuristic amplifier designs.                This work involves theoretical investigations of the electron               cyclotron maser (gyrotron) aimed at improving its performance as a              amplifier for coherent radiation in the far infrared.  The cyclotron            maser has important potential applications in short-wavelength radar,           communication links, spectroscopy, advanced accelerators and plasma             heating in thermonuclear fusion reactors.
{'FirstName': 'Robert', 'LastName': 'Schill', 'PI_MID_INIT': 'A', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Robert A Schill', 'EmailAddress': 'schill@ee.unlv.edu', 'NSF_ID': '000336769', 'StartDate': '07/15/1987', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
{'Name': 'University of Illinois at Chicago', 'CityName': 'CHICAGO', 'ZipCode': '606124305', 'PhoneNumber': '3129962862', 'StreetAddress': '809 S MARSHFIELD AVE M/C 551', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'Illinois', 'StateCode': 'IL', 'CONGRESSDISTRICT': '07', 'CONGRESS_DISTRICT_ORG': 'IL07', 'ORG_UEI_NUM': 'W8XEAJDKMXH3', 'ORG_LGL_BUS_NAME': 'UNIVERSITY OF ILLINOIS', 'ORG_PRNT_UEI_NUM': None}
{'Name': 'University of Illinois Champaign', 'CityName': 'Champaign', 'StateCode': 'IL', 'ZipCode': '618206219', 'StreetAddress': '105 Davenport House', 'CountryCode': 'US', 'CountryName': 'United States', 'StateName': 'Illinois', 'CountryFlag': '1', 'CONGRESSDISTRICT': '13', 'CONGRESS_DISTRICT_PERF': 'IL13'}
{'Code': '151700', 'Text': 'EPMD-ElectrnPhoton&MagnDevices'}
{'url': 'https://www.nsf.gov/awardsearch/download?DownloadFileName=1987&All=true', 'xml': '8707604.xml'}