Pub Date : 1987-12-01DOI: 10.1109/irmm.1987.9127013
C. Nguyen
The development of millimeter wave hybrid integrated circuit balanced mixers using two-terminal devices has been considered nearly mature. In this paper, the present state of this technology is reviewed. Advantages and disadvantages of existing mixer configurations are discussed along with their measured performances. Some new configurations for both fundamental and subharmonic mixers are also proposed and examined.
{"title":"The status of millimeter wave hybrid integrated-circuit balanced mixers","authors":"C. Nguyen","doi":"10.1109/irmm.1987.9127013","DOIUrl":"https://doi.org/10.1109/irmm.1987.9127013","url":null,"abstract":"The development of millimeter wave hybrid integrated circuit balanced mixers using two-terminal devices has been considered nearly mature. In this paper, the present state of this technology is reviewed. Advantages and disadvantages of existing mixer configurations are discussed along with their measured performances. Some new configurations for both fundamental and subharmonic mixers are also proposed and examined.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"36 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":"121913597","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.1987.9127085
K. Tiong, S. Kuo, P. E. Miller
We have set up a cusptron device to compare the performance of π mode and 2π mode operation at 8th harmonic interaction. A concentric e-layer of of 30 Kev (γ=1.06) is produced for wave generation. For 2π mode operation, an 8-slotted waveguide with b/a = 22 is used, where b and a are the radii of the vane and the inner wall of the waveguide respectively. In order to achieve same output frequency for comparison, a 16-slotted waveguide with b/a =1.23 is used for π mode operation. The arrangement of the set up will be described. The preliminary results of the experiments will also be presented.
{"title":"Experiments for an eighth harmonic cusptron tube","authors":"K. Tiong, S. Kuo, P. E. Miller","doi":"10.1109/irmm.1987.9127085","DOIUrl":"https://doi.org/10.1109/irmm.1987.9127085","url":null,"abstract":"We have set up a cusptron device to compare the performance of π mode and 2π mode operation at 8th harmonic interaction. A concentric e-layer of of 30 Kev (γ=1.06) is produced for wave generation. For 2π mode operation, an 8-slotted waveguide with b/a = 22 is used, where b and a are the radii of the vane and the inner wall of the waveguide respectively. In order to achieve same output frequency for comparison, a 16-slotted waveguide with b/a =1.23 is used for π mode operation. The arrangement of the set up will be described. The preliminary results of the experiments will also be presented.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"14 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":"125824870","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.1987.9126982
P. Garin, E. Jedar, G. Jendrzejczak, G. Mourier, F. Payen, L. Teyssier
We have published a few papers on the development of a 100 GHz 200 kW Gyrotron oscillator aiming at producing at least 20,000 pulses with 90 % mode purity.
{"title":"Symmetric and non-symmetric modes in a 200 kw, 100 GHz gyrotron","authors":"P. Garin, E. Jedar, G. Jendrzejczak, G. Mourier, F. Payen, L. Teyssier","doi":"10.1109/IRMM.1987.9126982","DOIUrl":"https://doi.org/10.1109/IRMM.1987.9126982","url":null,"abstract":"We have published a few papers on the development of a 100 GHz 200 kW Gyrotron oscillator aiming at producing at least 20,000 pulses with 90 % mode purity.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"207 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":"122323450","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.1987.9126899
S. Chen, G. L. Johnston, F. Hartemann, G. Bekefi
We report experimental and theoretical studies of a novel type of cross-field microwave generator. The cathode is smooth while the anode is rippled (Fig.1) to produce an azimuthally periodic modulation of the radial electric field (analogous to an electrostatic wiggler). The system is operated in the inverted geometry,1 where electrons are field-emitted from the inside of the smooth outer conductor. The depth of the grooves is adjusted so as to favor FEL interactions and minimize the usual slow-wave (magnetron) interactions.2 Approximate analytic single-particle orbits in the external crossed uniform electric and magnetic fields and the radial electric wiggler field of an idealized planar device are obtained. These orbits provide a basis for uniform and nonuniform kinetic and fluid equilibrium distribution functions. These equilibria in turn provide a basis for linear stability analyses of the device, which yield appropriate dispersion relations. Experimentally, we observe for our parameters (V ∼ 300 kV, I ∼ 1 kA, B‖ ∼ 5 kG, N = 0,8,12,24 wiggler periods) a high power microwave signal in the Ka-band. Removal of the wiggler (smooth-bore magnetron configuration) results in a reduction of the signal by ∼ 20 dB. These results suggest an emission mechanism analogous to that of the rippled-field magnetron.3
我们报道了一种新型的跨场微波发生器的实验和理论研究。阴极是光滑的，而阳极是波纹的(图1)，以产生径向电场的方位周期性调制(类似于静电摆动器)。该系统在反向几何结构中运行，其中电子从光滑的外导体内部场发射。凹槽的深度调整，以便有利于自由电子激光器的相互作用，并尽量减少通常的慢波(磁控管)相互作用得到了理想平面器件在外部均匀交叉电场和磁场中的近似解析单粒子轨道和径向电摆振场。这些轨道为均匀和非均匀的动力学和流体平衡分布函数提供了基础。这些平衡反过来又为器件的线性稳定性分析提供了基础，从而得出适当的色散关系。实验中，我们观察到我们的参数(V ~ 300 kV, I ~ 1 kA, B‖~ 5 kG, N = 0,8,12,24振荡周期)在kA波段的高功率微波信号。去除摆动器(光滑孔磁控管结构)导致信号减少约20 dB。这些结果表明了一种类似于波纹场磁控管的发射机制
{"title":"Electrostatically pumped cross-field free electron laser","authors":"S. Chen, G. L. Johnston, F. Hartemann, G. Bekefi","doi":"10.1109/irmm.1987.9126899","DOIUrl":"https://doi.org/10.1109/irmm.1987.9126899","url":null,"abstract":"We report experimental and theoretical studies of a novel type of cross-field microwave generator. The cathode is smooth while the anode is rippled (Fig.1) to produce an azimuthally periodic modulation of the radial electric field (analogous to an electrostatic wiggler). The system is operated in the inverted geometry,1 where electrons are field-emitted from the inside of the smooth outer conductor. The depth of the grooves is adjusted so as to favor FEL interactions and minimize the usual slow-wave (magnetron) interactions.2 Approximate analytic single-particle orbits in the external crossed uniform electric and magnetic fields and the radial electric wiggler field of an idealized planar device are obtained. These orbits provide a basis for uniform and nonuniform kinetic and fluid equilibrium distribution functions. These equilibria in turn provide a basis for linear stability analyses of the device, which yield appropriate dispersion relations. Experimentally, we observe for our parameters (V ∼ 300 kV, I ∼ 1 kA, B‖ ∼ 5 kG, N = 0,8,12,24 wiggler periods) a high power microwave signal in the Ka-band. Removal of the wiggler (smooth-bore magnetron configuration) results in a reduction of the signal by ∼ 20 dB. These results suggest an emission mechanism analogous to that of the rippled-field magnetron.3","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":"125911688","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.1987.9127040
J. Izatt, B. Deka, W. Zhu, J. Rai
As new gain media are investigated and new optical pumping conditions are employed, the spectral coverage produced by Raman FIR lasers continues to expand. Concommitant efforts to improve the theoretical modeling are improving our understanding of the laser and contributing to the optimization of its performance.
{"title":"Recent advances in tunable Raman fir lasers","authors":"J. Izatt, B. Deka, W. Zhu, J. Rai","doi":"10.1109/irmm.1987.9127040","DOIUrl":"https://doi.org/10.1109/irmm.1987.9127040","url":null,"abstract":"As new gain media are investigated and new optical pumping conditions are employed, the spectral coverage produced by Raman FIR lasers continues to expand. Concommitant efforts to improve the theoretical modeling are improving our understanding of the laser and contributing to the optimization of its performance.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"32 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":"126179996","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.1987.9127070
M. C. Lee, S. Kuo
We discuss the possible induction of magnetic field fluctuations in laboratory plasma during plasma heating by electromagnetic waves. Basically, the electromagnetic wave excited lower hybrid waves may become pump waves to excite instabilities. We will describe a process that can simultaneously generate plasma density fluctuations and magnetic field fluctuations. Significant cross-field magnetic perturbations can be produced and, then, give rise to the plasma confinement problem during plasma heating.
{"title":"Induced magnetic perturbations by plasma heating","authors":"M. C. Lee, S. Kuo","doi":"10.1109/IRMM.1987.9127070","DOIUrl":"https://doi.org/10.1109/IRMM.1987.9127070","url":null,"abstract":"We discuss the possible induction of magnetic field fluctuations in laboratory plasma during plasma heating by electromagnetic waves. Basically, the electromagnetic wave excited lower hybrid waves may become pump waves to excite instabilities. We will describe a process that can simultaneously generate plasma density fluctuations and magnetic field fluctuations. Significant cross-field magnetic perturbations can be produced and, then, give rise to the plasma confinement problem during plasma heating.","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":"122570258","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.1987.9127041
H. Everitt, F. D. De Lucia, D. Skatrud
A small diameter CW FIR laser that can provide approximately 100 MHz spectrally pure tunability has been developed and studied both experimentally and theoretically (1). Operation of this laser at pressures significantly greater than the maximum allowed by previously accepted theory yields the large tunability. The new model includes additional high energy vibrational states and appropriate energy transfer mechanisms that fundamentally alter the behavior in the high pressure, high pump intensity regime. Although 13CH3F is used for both the experimental demonstration and the theoretical model, the concept is general and should apply to all diffusion deactivated FIR lasers.
{"title":"A small tunable optically pumped far infrared laser","authors":"H. Everitt, F. D. De Lucia, D. Skatrud","doi":"10.1109/irmm.1987.9127041","DOIUrl":"https://doi.org/10.1109/irmm.1987.9127041","url":null,"abstract":"A small diameter CW FIR laser that can provide approximately 100 MHz spectrally pure tunability has been developed and studied both experimentally and theoretically (1). Operation of this laser at pressures significantly greater than the maximum allowed by previously accepted theory yields the large tunability. The new model includes additional high energy vibrational states and appropriate energy transfer mechanisms that fundamentally alter the behavior in the high pressure, high pump intensity regime. Although 13CH3F is used for both the experimental demonstration and the theoretical model, the concept is general and should apply to all diffusion deactivated FIR lasers.","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":"122756134","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.1987.9127038
P. Janssen, K. Leuven
The FIR transmission spectrum of [Pd(-chnx)2Br] Br2 was studied in magnetic fields up to 7 T and at temperatures below 2.5 K. With the magnetic field oriented perpendicular to the c-axis, several peaks were observed. The origin of these is not yet well understood.
{"title":"Fir results in [pd (-chnx) 2br] br2","authors":"P. Janssen, K. Leuven","doi":"10.1109/IRMM.1987.9127038","DOIUrl":"https://doi.org/10.1109/IRMM.1987.9127038","url":null,"abstract":"The FIR transmission spectrum of [Pd(-chnx)2Br] Br2 was studied in magnetic fields up to 7 T and at temperatures below 2.5 K. With the magnetic field oriented perpendicular to the c-axis, several peaks were observed. The origin of these is not yet well understood.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"48 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":"122472962","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.1987.9127058
J. Bong, K. Chang
The parasitic effects on millimeter-wave phase shifters have been studied for both analog and digital applications. The analog phase shifter uses the hybrid coupled configuration and the digital phase shifter uses the loaded line configuaraton. The results have shown that the parasitics have strong effects on the phase shifter performance at high frequencies.
{"title":"Parasitic effects on millimeter-wave phase shifter design","authors":"J. Bong, K. Chang","doi":"10.1109/irmm.1987.9127058","DOIUrl":"https://doi.org/10.1109/irmm.1987.9127058","url":null,"abstract":"The parasitic effects on millimeter-wave phase shifters have been studied for both analog and digital applications. The analog phase shifter uses the hybrid coupled configuration and the digital phase shifter uses the loaded line configuaraton. The results have shown that the parasitics have strong effects on the phase shifter performance at high frequencies.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"214 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":"115508425","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.1987.9126891
D. P. Campbell, D. M. Guillory, J. Gallagher
Techniques are discussed for measurement of molecular absorption intensity in the millimeter wavelength region with Fabry-Perot Interferometers. Comparison is made with other intensity measuring schemes. Included in the presentation are experimental and theoretical considerations of cavity characteristics, pressure effects, spectral line density, hydrogen bonding, measurement techniques and source stability.
{"title":"Molecular absorption intensity measurements in the millimeter wavelength region","authors":"D. P. Campbell, D. M. Guillory, J. Gallagher","doi":"10.1109/irmm.1987.9126891","DOIUrl":"https://doi.org/10.1109/irmm.1987.9126891","url":null,"abstract":"Techniques are discussed for measurement of molecular absorption intensity in the millimeter wavelength region with Fabry-Perot Interferometers. Comparison is made with other intensity measuring schemes. Included in the presentation are experimental and theoretical considerations of cavity characteristics, pressure effects, spectral line density, hydrogen bonding, measurement techniques and source stability.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"4 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":"131155832","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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