Pub Date : 1987-12-01DOI: 10.1109/irmm.1987.9126933
I. Alexeff, M. Rader, F. Dyer
The Orbitron Maser is a device in which R.F. radiation is produced by electrons in elongated or circular orbits around a positively charged central anode wire. This wire is surrounded by a circular cylinder which is at ground potential. This cylinder acts both as a cathode and as a cavity resonator. The frequency of this radiation, for circular orbits, (v) is,
{"title":"Stimulated emission, amplification, and upward frequency shift of the orbitron maser","authors":"I. Alexeff, M. Rader, F. Dyer","doi":"10.1109/irmm.1987.9126933","DOIUrl":"https://doi.org/10.1109/irmm.1987.9126933","url":null,"abstract":"The Orbitron Maser is a device in which R.F. radiation is produced by electrons in elongated or circular orbits around a positively charged central anode wire. This wire is surrounded by a circular cylinder which is at ground potential. This cylinder acts both as a cathode and as a cavity resonator. The frequency of this radiation, for circular orbits, (v) is,","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125617855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-12-01DOI: 10.1109/irmm.1987.9126908
D. Cohn, L. Bromberg, W. Halverson, B. Lax, P. Woskov
Possibilities for use of high temperature superconductors in microwave/far infrared resonators and waveguides are described. Relative to conventional superconductors, the use of high temperature superconductors could remove the constraint of relatively low energy gaps and provide larger thermal margins and more effective cooling. The higher critical magnetic fields may also be important for an increased range of operation. These features could be used to improve performance of present superconducting microwave cavities and to provide new applications at both microwave frequencies and at much higher frequencies. Constraints that may inhibit development include a need for superconducting properties over a high fraction of the surface, limits on critical RF fields and the effect of D.C. magnetic fields.
{"title":"Invited keynote possibilities for microwave/far infrared cavities and waveguides using high temperature superconductors","authors":"D. Cohn, L. Bromberg, W. Halverson, B. Lax, P. Woskov","doi":"10.1109/irmm.1987.9126908","DOIUrl":"https://doi.org/10.1109/irmm.1987.9126908","url":null,"abstract":"Possibilities for use of high temperature superconductors in microwave/far infrared resonators and waveguides are described. Relative to conventional superconductors, the use of high temperature superconductors could remove the constraint of relatively low energy gaps and provide larger thermal margins and more effective cooling. The higher critical magnetic fields may also be important for an increased range of operation. These features could be used to improve performance of present superconducting microwave cavities and to provide new applications at both microwave frequencies and at much higher frequencies. Constraints that may inhibit development include a need for superconducting properties over a high fraction of the surface, limits on critical RF fields and the effect of D.C. magnetic fields.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"49 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134196278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-12-01DOI: 10.1109/irmm.1987.9127035
Liquan He, Gen-hua Xu, Sifai Li
Two new types of integrated switch are presented. Conmercial beam-lead diode originally designed for lower frequency band can be used at higher frequency band by means of reverse-mode and compensation technique. The experimental results of two prototype circuits at Ka-band and W-band are given.
{"title":"A new technique for raising operating frequency of pin diodes","authors":"Liquan He, Gen-hua Xu, Sifai Li","doi":"10.1109/irmm.1987.9127035","DOIUrl":"https://doi.org/10.1109/irmm.1987.9127035","url":null,"abstract":"Two new types of integrated switch are presented. Conmercial beam-lead diode originally designed for lower frequency band can be used at higher frequency band by means of reverse-mode and compensation technique. The experimental results of two prototype circuits at Ka-band and W-band are given.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129604587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-12-01DOI: 10.1109/IRMM.1987.9127080
H. Mathews, G. Agosti, K. Holm, D. Kuse, P. Muggli, M. Tran, S. Alberti, A. Perrenoud, T. Tran
In the frame of a development program aiming towards an 8 GHz, 500 kW CW gyrotron, a 200 kW prototype has been tested at pulse lengths up to 30 ms, yielding 50% electronic efficiency. More than 99% of the output power were measured in the TE01 mode. A fully-cooled long pulse gyrotron for 300 kW at maximum efficiency (57.8%) has been manufactured.
{"title":"A high power gyrotron oscillator at 8 GHz","authors":"H. Mathews, G. Agosti, K. Holm, D. Kuse, P. Muggli, M. Tran, S. Alberti, A. Perrenoud, T. Tran","doi":"10.1109/IRMM.1987.9127080","DOIUrl":"https://doi.org/10.1109/IRMM.1987.9127080","url":null,"abstract":"In the frame of a development program aiming towards an 8 GHz, 500 kW CW gyrotron, a 200 kW prototype has been tested at pulse lengths up to 30 ms, yielding 50% electronic efficiency. More than 99% of the output power were measured in the TE01 mode. A fully-cooled long pulse gyrotron for 300 kW at maximum efficiency (57.8%) has been manufactured.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132391721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-12-01DOI: 10.1109/irmm.1987.9127077
I. Mukhopadhyay, R. Lees, W. Lewis-Bevan
Results of extensive analysis of the high resolution Fourier transform spectrum of the C-O stretch band of 13CH3OH are presented for the A torsional symmetry species in the n=0 torsional ground state, in terms of phenomenological state-dependent parameters. FIR laser assignments associated with (nτK)=(019) states are also discussed.
{"title":"On the high resolution infrared spectroscopy of the c-0 stretch band of 13CH3OH: Phenomenological parameters for the a-species in the torsional ground state","authors":"I. Mukhopadhyay, R. Lees, W. Lewis-Bevan","doi":"10.1109/irmm.1987.9127077","DOIUrl":"https://doi.org/10.1109/irmm.1987.9127077","url":null,"abstract":"Results of extensive analysis of the high resolution Fourier transform spectrum of the C-O stretch band of 13CH3OH are presented for the A torsional symmetry species in the n=0 torsional ground state, in terms of phenomenological state-dependent parameters. FIR laser assignments associated with (nτK)=(019) states are also discussed.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114820505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-12-01DOI: 10.1109/irmm.1987.9127048
R. Lees, I. Mukhopadhyay
An assignment is proposed for the strong 127.02 μm FIR line in 13CD3OH pumped with very high efficiency by the 10P(8) CO2 laser line. Other assignments and predictions are also discussed for CH3OH, 13CH3OH, CD3OH and CD3OD FIR lines.
{"title":"Analysis of the high efficiency 127 μm FIR laser line of 13CD3OH and other 13CD3OH, CD3OH, CD3OD, CH3OH and 13CH3OH FIR laser lines","authors":"R. Lees, I. Mukhopadhyay","doi":"10.1109/irmm.1987.9127048","DOIUrl":"https://doi.org/10.1109/irmm.1987.9127048","url":null,"abstract":"An assignment is proposed for the strong 127.02 μm FIR line in <sup>13</sup>CD<inf>3</inf>OH pumped with very high efficiency by the 10P(8) CO<inf>2</inf> laser line. Other assignments and predictions are also discussed for CH<inf>3</inf>OH, <sup>13</sup>CH<inf>3</inf>OH, CD<inf>3</inf>OH and CD<inf>3</inf>OD FIR lines.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114714469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-12-01DOI: 10.1109/irmm.1987.9126959
A. Fliflet, R. Lee, W. Manheimer, E. Ott
A time-dependent slow-time-scale theory is developed for the analysis of high power, pulsed gyrotrons driven by external RF sources. Phase-locking of a gyrotron by direct injection of radiation into the cavity and by beam premodulation via a bunching cavity is investigated. Calculations are carried out to simulate the operation of a 35 GHz high voltage gyrotron.
{"title":"Calculation of non-stationary effects in gyrotrons","authors":"A. Fliflet, R. Lee, W. Manheimer, E. Ott","doi":"10.1109/irmm.1987.9126959","DOIUrl":"https://doi.org/10.1109/irmm.1987.9126959","url":null,"abstract":"A time-dependent slow-time-scale theory is developed for the analysis of high power, pulsed gyrotrons driven by external RF sources. Phase-locking of a gyrotron by direct injection of radiation into the cavity and by beam premodulation via a bunching cavity is investigated. Calculations are carried out to simulate the operation of a 35 GHz high voltage gyrotron.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114750792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-12-01DOI: 10.1109/irmm.1987.9127023
H. Pak, J. Petersen
Ten infrared radio-frequency double resonance signals have been observed in CH3OD. Tentative assignments of these transitions will be discussed. The observed transitions belong to A-type symmetry states and allow for the determination of asymmetry splitting parameters. These are useful in further assignments of rovibrational lines belonging to the CO-stretch fundamental band, which has recently been recorded.
{"title":"Infrared radio-frequency double resonance in ch3od","authors":"H. Pak, J. Petersen","doi":"10.1109/irmm.1987.9127023","DOIUrl":"https://doi.org/10.1109/irmm.1987.9127023","url":null,"abstract":"Ten infrared radio-frequency double resonance signals have been observed in CH3OD. Tentative assignments of these transitions will be discussed. The observed transitions belong to A-type symmetry states and allow for the determination of asymmetry splitting parameters. These are useful in further assignments of rovibrational lines belonging to the CO-stretch fundamental band, which has recently been recorded.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132242460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-12-01DOI: 10.1109/irmm.1987.9126897
K. Leou, D. Mcdermott, N. Luhmann
Preliminary analytical work has been performed on a low order prebunched FEL interaction, which exploits the narrow micropulse width of the beam produced by a linac compared to the wavelength of the generated wave. If the electrons are resonant with the FEL beat wave, then short electron micro-pulses will yield gain significantly higher than in the conventional FEL.
{"title":"FEL-klystron for prebunched ka-band emission","authors":"K. Leou, D. Mcdermott, N. Luhmann","doi":"10.1109/irmm.1987.9126897","DOIUrl":"https://doi.org/10.1109/irmm.1987.9126897","url":null,"abstract":"Preliminary analytical work has been performed on a low order prebunched FEL interaction, which exploits the narrow micropulse width of the beam produced by a linac compared to the wavelength of the generated wave. If the electrons are resonant with the FEL beat wave, then short electron micro-pulses will yield gain significantly higher than in the conventional FEL.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128321433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-12-01DOI: 10.1109/irmm.1987.9127015
P. Kempf, M. von Ortenberg, E. Bangert, G. Landwehr, G. Weimann, W. Schlapp
As compared to n-type GaAs/Ga(Al)As hetero junctions, the corresponding p-type structures are by far neither as well understood nor thoroughly explored. The reasons for this are the complicated valence-band structure from the theoretical point of view and the relatively low mobility of the 2D-holes from the experimental side. As a matter of fact, the summary of experimental and theoretical results re-mained fragmentary and inconsistent, so that no direct criterion could be used to distinguish between the different modes established [1–4]. In the present study we present a complex set of submilimeter-magneto-transmission data up to 35 Tesla for different sample configurations and temperatures in context with a straight-on simulation of the data applying KUBO's formula [5] for the microscopic high-frequency conductivity in a realistic op-tical multi-layer system including inter-ference effects.
{"title":"Submillimeter-magneto spectroscopy on p-type gaas/ga(al)as hetero structures","authors":"P. Kempf, M. von Ortenberg, E. Bangert, G. Landwehr, G. Weimann, W. Schlapp","doi":"10.1109/irmm.1987.9127015","DOIUrl":"https://doi.org/10.1109/irmm.1987.9127015","url":null,"abstract":"As compared to n-type GaAs/Ga(Al)As hetero junctions, the corresponding p-type structures are by far neither as well understood nor thoroughly explored. The reasons for this are the complicated valence-band structure from the theoretical point of view and the relatively low mobility of the 2D-holes from the experimental side. As a matter of fact, the summary of experimental and theoretical results re-mained fragmentary and inconsistent, so that no direct criterion could be used to distinguish between the different modes established [1–4]. In the present study we present a complex set of submilimeter-magneto-transmission data up to 35 Tesla for different sample configurations and temperatures in context with a straight-on simulation of the data applying KUBO's formula [5] for the microscopic high-frequency conductivity in a realistic op-tical multi-layer system including inter-ference effects.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134551849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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