Pub Date : 1987-12-01DOI: 10.1109/irmm.1987.9126984
O. Dumbrajs, B. Jödicke
One of the advantages of a complex cavity is the possibility of suppression of parasitic modes by a properly chosen geometry. However, due to nonlinear dynamical effects other modes can be excited and, possibly, ruin the expected advantage mentioned. We study the conditions of self excitation of parasitic modes in the presence of oscillations of the operating mode. Detailed results are presented for a complex cavity with the mode conversion TE03/TE06 planned for the KfK experiment.
{"title":"Mode competition in a complex cavity for gyrotrons","authors":"O. Dumbrajs, B. Jödicke","doi":"10.1109/irmm.1987.9126984","DOIUrl":"https://doi.org/10.1109/irmm.1987.9126984","url":null,"abstract":"One of the advantages of a complex cavity is the possibility of suppression of parasitic modes by a properly chosen geometry. However, due to nonlinear dynamical effects other modes can be excited and, possibly, ruin the expected advantage mentioned. We study the conditions of self excitation of parasitic modes in the presence of oscillations of the operating mode. Detailed results are presented for a complex cavity with the mode conversion TE03/TE06 planned for the KfK experiment.","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":"130683973","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.1987.9127051
K. Pendergast, B. Danly, R. Temkin, T. Tran
A high-power, 140 GHz cyclotron autoresonance maser (CARM) amplifier experiment is planned at M.I.T. The experiment will employ a high-voltage (450–700 kV) electron beam from a Pierce gun and a helical wiggler to produce the required β⊤ on the beam. Details of the design and predicted performance will be presented. One- and three-dimensional computer simulation results are presented and the influence of velocity spread on CARM operation is discussed.
{"title":"Design of a high power, 140 GHz carm amplifier","authors":"K. Pendergast, B. Danly, R. Temkin, T. Tran","doi":"10.1109/irmm.1987.9127051","DOIUrl":"https://doi.org/10.1109/irmm.1987.9127051","url":null,"abstract":"A high-power, 140 GHz cyclotron autoresonance maser (CARM) amplifier experiment is planned at M.I.T. The experiment will employ a high-voltage (450–700 kV) electron beam from a Pierce gun and a helical wiggler to produce the required β⊤ on the beam. Details of the design and predicted performance will be presented. One- and three-dimensional computer simulation results are presented and the influence of velocity spread on CARM operation is discussed.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"124 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":"126786514","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.1987.9127042
S. Evangelides, L. Carson, B. Danly, R. Temkin
Using a single mode tuneable CO2 laser to pump the Q(12) transition in CH3 F and a heterodyne receiver to make frequency measurements on the resulting FIR radiation, we have documented the near resonance tuning behavoir of this FIR Raman transition as the pump laser is tuned. Nonlinear frequency tuning of FIR emission is observed due to inhomogeneous (K level) broadening of the Raman transition.
{"title":"Tuning behavior of a ch3f amplified spontaneous emission laser","authors":"S. Evangelides, L. Carson, B. Danly, R. Temkin","doi":"10.1109/irmm.1987.9127042","DOIUrl":"https://doi.org/10.1109/irmm.1987.9127042","url":null,"abstract":"Using a single mode tuneable CO2 laser to pump the Q(12) transition in CH3 F and a heterodyne receiver to make frequency measurements on the resulting FIR radiation, we have documented the near resonance tuning behavoir of this FIR Raman transition as the pump laser is tuned. Nonlinear frequency tuning of FIR emission is observed due to inhomogeneous (K level) broadening of the Raman transition.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"11 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":"122878053","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.1987.9126980
J. Pae, T. Nozokido, K. Furuya, H. Shirai, K. Mizuno
We have observed the inverse Smith-Purcell (ISP) effect for the first time by using a submillimeter wave laser as a driving source. The ISP effect is one of the candidates for laser-driven linacs with a metallic grating as an interaction circuit to produce acceleration gradient of a few GeV/m. In this paper, we describe our experimental apparatus including newly developed CO2 laser and the first experimental evidence of this effect.
{"title":"Submillimeter wave inverse smith-purcell effect","authors":"J. Pae, T. Nozokido, K. Furuya, H. Shirai, K. Mizuno","doi":"10.1109/IRMM.1987.9126980","DOIUrl":"https://doi.org/10.1109/IRMM.1987.9126980","url":null,"abstract":"We have observed the inverse Smith-Purcell (ISP) effect for the first time by using a submillimeter wave laser as a driving source. The ISP effect is one of the candidates for laser-driven linacs with a metallic grating as an interaction circuit to produce acceleration gradient of a few GeV/m. In this paper, we describe our experimental apparatus including newly developed CO2 laser and the first experimental evidence of this effect.","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":"126531957","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.1987.9127031
A. Rong, Sifai Li
Up to now the finlines proposed by Meier as MMW transmission line for fMW integrated circuits have been used by components designers with growing interest and importance. There has been an increasing activity concerning the theoretical foundations of the discontinuities of finlines in order to lead eventually to a more sophisticated CAD program of printed E-plane circuits. But only few research has been carried out for the general case when the fin slot is less than the height of housing.[1,2] The results are emperical or approximate. No rigorous results are available. In this paper the general case of finline strip discontinuities is first investigated rigorously by resonance method and variational technique and a set of design charts are evaluated. Using these results Ka-band band pass filters with unilateral and bilateral finline strips have been realised demonstrating the feasibility of the employed equivalent circuit approach. The measured results agree well with the theoretical predictions. The measured minimum insertion losses at pass band are 0.64 dB and 0. 52 dB respectively.
{"title":"Investigation of finiine strip discontinuities and its application to millimeter wave filters","authors":"A. Rong, Sifai Li","doi":"10.1109/IRMM.1987.9127031","DOIUrl":"https://doi.org/10.1109/IRMM.1987.9127031","url":null,"abstract":"Up to now the finlines proposed by Meier as MMW transmission line for fMW integrated circuits have been used by components designers with growing interest and importance. There has been an increasing activity concerning the theoretical foundations of the discontinuities of finlines in order to lead eventually to a more sophisticated CAD program of printed E-plane circuits. But only few research has been carried out for the general case when the fin slot is less than the height of housing.[1,2] The results are emperical or approximate. No rigorous results are available. In this paper the general case of finline strip discontinuities is first investigated rigorously by resonance method and variational technique and a set of design charts are evaluated. Using these results Ka-band band pass filters with unilateral and bilateral finline strips have been realised demonstrating the feasibility of the employed equivalent circuit approach. The measured results agree well with the theoretical predictions. The measured minimum insertion losses at pass band are 0.64 dB and 0. 52 dB respectively.","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":"116971289","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.1987.9127034
D. Singh, G. Morgan
This work extends our previous studies of square cuboid dielectric resonators to the cylindrical pill types. The microstrip substrates considered are gallium arsenide and a polyimide, and calculations have been undertaken for all the resonant modes. Particular attention is given to the much used high Q TE016 mode, and the higher Q HE126 and TE01(1+δ) modes that we have used in several applications. The frequencies of the other TE, TM, EH and HE modes have been calculated to determine the resonator aspect ratio that minimises mode interference. Data presented include the effect of resonator permittivity, substrate thickness and permittivity, and the effect of circuit package. Experimental data are discussed briefly.
{"title":"The theoretical properties of higher mode cylindrical dielectric resonators for millimetre wave monolithic circuits","authors":"D. Singh, G. Morgan","doi":"10.1109/irmm.1987.9127034","DOIUrl":"https://doi.org/10.1109/irmm.1987.9127034","url":null,"abstract":"This work extends our previous studies of square cuboid dielectric resonators to the cylindrical pill types. The microstrip substrates considered are gallium arsenide and a polyimide, and calculations have been undertaken for all the resonant modes. Particular attention is given to the much used high Q TE016 mode, and the higher Q HE126 and TE01(1+δ) modes that we have used in several applications. The frequencies of the other TE, TM, EH and HE modes have been calculated to determine the resonator aspect ratio that minimises mode interference. Data presented include the effect of resonator permittivity, substrate thickness and permittivity, and the effect of circuit package. Experimental data are discussed briefly.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"7 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":"124372792","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.1987.9126934
J. Krall, M. Friedman, V. Serlin, Y. Lau
A time dependent, fully electromagnetic particle code is used to simulate the current modulation in an intense relativistic electron beam (IREB) by an external rf source in the nonlinear regime. It is shown that non-linear effects, responsible for the high modulation levels seen in the experiments(1,2), may be explained via simple models and the non-linear propagation of fast and slow space charge waves. Qualitative and quantitative agreement between the theory and simulations is obtained.
{"title":"Modulation of an intense beam by an external microwave source in the non-linear regime — theory and simulation","authors":"J. Krall, M. Friedman, V. Serlin, Y. Lau","doi":"10.1109/IRMM.1987.9126934","DOIUrl":"https://doi.org/10.1109/IRMM.1987.9126934","url":null,"abstract":"A time dependent, fully electromagnetic particle code is used to simulate the current modulation in an intense relativistic electron beam (IREB) by an external rf source in the nonlinear regime. It is shown that non-linear effects, responsible for the high modulation levels seen in the experiments(1,2), may be explained via simple models and the non-linear propagation of fast and slow space charge waves. Qualitative and quantitative agreement between the theory and simulations is obtained.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"7 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":"114203058","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.1987.9126979
J. Hernández, F. Canal
Five-layer wave-guiding structures are of great interest in magnetooptical for their use in the making of single-mode devices. In this work, non reciprocal single-mode conversion TE0-TM0 in a five–layer magnetooptical waveguide using infrared light (1.51μm) has been studied.
{"title":"Non reciprocal single mode conversion in five-layer magnetooptical waveguides","authors":"J. Hernández, F. Canal","doi":"10.1109/IRMM.1987.9126979","DOIUrl":"https://doi.org/10.1109/IRMM.1987.9126979","url":null,"abstract":"Five-layer wave-guiding structures are of great interest in magnetooptical for their use in the making of single-mode devices. In this work, non reciprocal single-mode conversion TE0-TM0 in a five–layer magnetooptical waveguide using infrared light (1.51μm) has been studied.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"35 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":"114644171","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.1987.9127018
A. Labrujere, T. Klaassen, W. Wenckebach, C. Foxon
The far infrared photoconductivity of Si doped GaAs has been studied using an optically pumped FIR laser working in the 10-150 cm range. At temperatures between H and 10 K in magnetic fields up to 12 T an almost complete set of transitions from the shallow (Si) donor groundstate to the excited hydrogenic levels (n = 2,3,4) is observed. The obtained field dependence of the energy levels is in good agreement with theoretical calculations.
{"title":"Far infrared photoconductivity experiments on the si donor in gaas","authors":"A. Labrujere, T. Klaassen, W. Wenckebach, C. Foxon","doi":"10.1109/irmm.1987.9127018","DOIUrl":"https://doi.org/10.1109/irmm.1987.9127018","url":null,"abstract":"The far infrared photoconductivity of Si doped GaAs has been studied using an optically pumped FIR laser working in the 10-150 cm range. At temperatures between H and 10 K in magnetic fields up to 12 T an almost complete set of transitions from the shallow (Si) donor groundstate to the excited hydrogenic levels (n = 2,3,4) is observed. The obtained field dependence of the energy levels is in good agreement with theoretical calculations.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"322 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":"115840853","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.1987.9126919
W. Thorpe
This paper describes a ‘proof of concept’ millimeterwave Frequency Extension Receiver (F.X.R.) designed as an add-on to an existing microwave airborne system. The F.X.R. extends the frequency coverage from the existing microwave region to greater than 100 GHz using commutatively switched downconverters. A key feature of this receiver is the modular construction which allows it to be added on to many existing microwave receiver systems.
{"title":"Millimeterwave frequency extension radar warning receiver","authors":"W. Thorpe","doi":"10.1109/IRMM.1987.9126919","DOIUrl":"https://doi.org/10.1109/IRMM.1987.9126919","url":null,"abstract":"This paper describes a ‘proof of concept’ millimeterwave Frequency Extension Receiver (F.X.R.) designed as an add-on to an existing microwave airborne system. The F.X.R. extends the frequency coverage from the existing microwave region to greater than 100 GHz using commutatively switched downconverters. A key feature of this receiver is the modular construction which allows it to be added on to many existing microwave receiver systems.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"31 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":"124237840","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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