Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.最新文献
Pub Date : 2004-01-01DOI: 10.1109/ICIMW.2004.1422194
L. Ives, C. Kory, M. Read, G. Miram, J. Booske
Advances in manufacturing techniques for small structures are facilitating the development of high frequency electron devices. Lithographic techniques, similar to those used by the semiconductor industry, are allowing construction of components with micron-size features, including mode converters, RF windows, field emission array cathodes, and RF circuits. This presentation describes the application of this technology to the development of high frequency traveling wave tubes for high data rate communications.
{"title":"Development of microfabricated traveling wave tubes","authors":"L. Ives, C. Kory, M. Read, G. Miram, J. Booske","doi":"10.1109/ICIMW.2004.1422194","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422194","url":null,"abstract":"Advances in manufacturing techniques for small structures are facilitating the development of high frequency electron devices. Lithographic techniques, similar to those used by the semiconductor industry, are allowing construction of components with micron-size features, including mode converters, RF windows, field emission array cathodes, and RF circuits. This presentation describes the application of this technology to the development of high frequency traveling wave tubes for high data rate communications.","PeriodicalId":13627,"journal":{"name":"Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86768904","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 : 2004-01-01DOI: 10.1109/ICIMW.2004.1422054
D. Wagner, F. Leuterer, G. Gantenbein, E. Holzhauer, W. Kasparek
A new broadband ECRH system is currently under construction at the ASDEX Upgrade tokamak. This system employs multi-frequency gyrotrons step-tunable in the range 105-140 GHz. A set of two corrugated polarizer mirrors are applied to provide for an arbitrary polarization of the Gaussian beam injected into the plasma. The principal bandwidth of such a two-polarizer setup has been evaluated. It can be shown that two mirrors with sinusoidal grooves and corrugation depths adjusted to the center frequency of 122.5 GHz satisfy the requirements.
{"title":"Polarizer design for multi-frequency high power ECRH transmission lines","authors":"D. Wagner, F. Leuterer, G. Gantenbein, E. Holzhauer, W. Kasparek","doi":"10.1109/ICIMW.2004.1422054","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422054","url":null,"abstract":"A new broadband ECRH system is currently under construction at the ASDEX Upgrade tokamak. This system employs multi-frequency gyrotrons step-tunable in the range 105-140 GHz. A set of two corrugated polarizer mirrors are applied to provide for an arbitrary polarization of the Gaussian beam injected into the plasma. The principal bandwidth of such a two-polarizer setup has been evaluated. It can be shown that two mirrors with sinusoidal grooves and corrugation depths adjusted to the center frequency of 122.5 GHz satisfy the requirements.","PeriodicalId":13627,"journal":{"name":"Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83019382","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 : 2004-01-01DOI: 10.1109/ICIMW.2004.1422101
A. V. Arzhannikov, P. Kalinin, A. Kuznetsov, S. Sinitsky
This paper presents the description of two spectral diagnostics employed to analyse spectral characteristics of powerful 4-mm radiation pulses generated in a planar free electron maser with hybrid resonator at the ELMI-device. To create this diagnostics we have applied heterodyne and resonant wavemeter that give us possibilities to obtain spectrum bandwidth, mode composition and width of single lines in spectrum of generated radiation.
{"title":"Usage of heterodyne and resonant wavemeter to analyse 4-mm radiation generated at ELMI-device","authors":"A. V. Arzhannikov, P. Kalinin, A. Kuznetsov, S. Sinitsky","doi":"10.1109/ICIMW.2004.1422101","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422101","url":null,"abstract":"This paper presents the description of two spectral diagnostics employed to analyse spectral characteristics of powerful 4-mm radiation pulses generated in a planar free electron maser with hybrid resonator at the ELMI-device. To create this diagnostics we have applied heterodyne and resonant wavemeter that give us possibilities to obtain spectrum bandwidth, mode composition and width of single lines in spectrum of generated radiation.","PeriodicalId":13627,"journal":{"name":"Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80816122","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 : 2004-01-01DOI: 10.1109/ICIMW.2004.1422036
A. Fernández, J. Doane, N. Kharchev, A. Cappa, J. Doncel, C. Moeller, F. Castejón, K. Sarksyan, A. Pardo
A first harmonic electron Bernstein waves heating system is being designed to heat a dense plasma in the TJ-II stellarator. The design of the quasi-optical components and the oversized corrugated waveguide of the transmission line (28 GHz, 300 kW, 100 ms) is presented. After the gyrotron two elliptical mirrors and two polarisers conform the Gaussian beam to match into the oversized waveguide. The beam is launched into the plasma by a steerable internal mirror. The expected losses are around 9%.
{"title":"The design of the 28 GHz transmission line for the EBW heating system in the TJ-II stellarator","authors":"A. Fernández, J. Doane, N. Kharchev, A. Cappa, J. Doncel, C. Moeller, F. Castejón, K. Sarksyan, A. Pardo","doi":"10.1109/ICIMW.2004.1422036","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422036","url":null,"abstract":"A first harmonic electron Bernstein waves heating system is being designed to heat a dense plasma in the TJ-II stellarator. The design of the quasi-optical components and the oversized corrugated waveguide of the transmission line (28 GHz, 300 kW, 100 ms) is presented. After the gyrotron two elliptical mirrors and two polarisers conform the Gaussian beam to match into the oversized waveguide. The beam is launched into the plasma by a steerable internal mirror. The expected losses are around 9%.","PeriodicalId":13627,"journal":{"name":"Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83416379","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 : 2004-01-01DOI: 10.1109/ICIMW.2004.1422266
J. Hogge
A way to determine the magnetic axis of gyrotron cryomagnets, and more generally magnets composed of coils wound around a single mandrel is presented. The method is based on measurements of the longitudinal component of the magnetic field performed at suitable locations with a high accuracy (100 ppm) Hall probe. The tilt and the shift of the magnetic axis with respect to the mechanical axis can be determined with a typical accuracy of 0.01/spl deg/ and 0.1 mm respectively.
{"title":"Accurate gyrotron magnetic axis determination","authors":"J. Hogge","doi":"10.1109/ICIMW.2004.1422266","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422266","url":null,"abstract":"A way to determine the magnetic axis of gyrotron cryomagnets, and more generally magnets composed of coils wound around a single mandrel is presented. The method is based on measurements of the longitudinal component of the magnetic field performed at suitable locations with a high accuracy (100 ppm) Hall probe. The tilt and the shift of the magnetic axis with respect to the mechanical axis can be determined with a typical accuracy of 0.01/spl deg/ and 0.1 mm respectively.","PeriodicalId":13627,"journal":{"name":"Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84768291","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 : 2004-01-01DOI: 10.1109/ICIMW.2004.1422145
P. Upadhya, K. L. Nguyen, Yaochun Shen, J. Obradovic, K. Fukushige, R. Griffiths, L. Gladden, A. Davies, E. Linfield
Time-resolved terahertz (THz) spectroscopy has been used to characterize polymorphic transformations in crystalline theophylline, a widely used pharmaceutical compound. On transformation, different inter-molecular bonding arrangements arise, leading to distinct THz spectral signals. Changes between polymorphic forms were confirmed by IR and powder X-ray diffraction measurements.
{"title":"Transformation-induced evolution of far-infrared vibrational modes in theophylline","authors":"P. Upadhya, K. L. Nguyen, Yaochun Shen, J. Obradovic, K. Fukushige, R. Griffiths, L. Gladden, A. Davies, E. Linfield","doi":"10.1109/ICIMW.2004.1422145","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422145","url":null,"abstract":"Time-resolved terahertz (THz) spectroscopy has been used to characterize polymorphic transformations in crystalline theophylline, a widely used pharmaceutical compound. On transformation, different inter-molecular bonding arrangements arise, leading to distinct THz spectral signals. Changes between polymorphic forms were confirmed by IR and powder X-ray diffraction measurements.","PeriodicalId":13627,"journal":{"name":"Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88723844","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 : 2004-01-01DOI: 10.1109/ICIMW.2004.1422039
S. Illy, I. Danilov, S. Raff, B. Piosczyk
The design of the collector for the 2 MW coaxial gyrotron has been verified taking into account the effect of eddy currents in the collector walls by using the ANSYS finite element code. As a result, it has been found that the eddy currents in the walls significantly influence the sweeping behaviour of the electron beam along the collector surface. An estimation according to the well known skin effect is therefore not sufficient. This modified field distribution results in a strong reduction of the sweeping range and thus in an unacceptable increase of the power loading on the collector wall.
{"title":"Design studies of the collector sweeping system for the 2 MW 170 GHz coaxial gyrotron for ITER","authors":"S. Illy, I. Danilov, S. Raff, B. Piosczyk","doi":"10.1109/ICIMW.2004.1422039","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422039","url":null,"abstract":"The design of the collector for the 2 MW coaxial gyrotron has been verified taking into account the effect of eddy currents in the collector walls by using the ANSYS finite element code. As a result, it has been found that the eddy currents in the walls significantly influence the sweeping behaviour of the electron beam along the collector surface. An estimation according to the well known skin effect is therefore not sufficient. This modified field distribution results in a strong reduction of the sweeping range and thus in an unacceptable increase of the power loading on the collector wall.","PeriodicalId":13627,"journal":{"name":"Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91060972","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 : 2004-01-01DOI: 10.1109/ICIMW.2004.1422106
M. Bakunov, A. Maslov, S. Bodrov, M. Hangyo
We show that surface waves - surface plasmon-polariton (SPP) with frequencies in the THz range can be excited at semiconductor surfaces by optical beams that scan the surface. This technique opens new ways to build THz sources and perform surface spectroscopy.
{"title":"Generation of THz surface waves by a superluminous optical spot","authors":"M. Bakunov, A. Maslov, S. Bodrov, M. Hangyo","doi":"10.1109/ICIMW.2004.1422106","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422106","url":null,"abstract":"We show that surface waves - surface plasmon-polariton (SPP) with frequencies in the THz range can be excited at semiconductor surfaces by optical beams that scan the surface. This technique opens new ways to build THz sources and perform surface spectroscopy.","PeriodicalId":13627,"journal":{"name":"Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89431829","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 : 2004-01-01DOI: 10.1109/ICIMW.2004.1421956
M. Kimmitt
In a very recent publication the author was amused to read ... 'that this region of the spectrum has only begun to be explored thoroughly over the last decade'. The authors might be surprised to learn that there were over 1500 publications concerning what is now conveniently called the terahertz (THz) region between the 1890s and 1970. There were countless more in the next 25 years. However, rather than dwelling on the well-documented surge of activity from the late 1950s onwards, due to such things as the arrival of digital computers for Fourier transform spectroscopy, helium-cooled detectors and long-wavelength lasers, this paper looks back to the very early years of research in this spectral region. The end date of 1923 is the year when the 'gap' between the far-infrared and electric waves (as they were then called) was closed. It is truly remarkable that so much was achieved with what was very basic technology.
{"title":"Terahertz research - the first thirty years (1895-1924)","authors":"M. Kimmitt","doi":"10.1109/ICIMW.2004.1421956","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1421956","url":null,"abstract":"In a very recent publication the author was amused to read ... 'that this region of the spectrum has only begun to be explored thoroughly over the last decade'. The authors might be surprised to learn that there were over 1500 publications concerning what is now conveniently called the terahertz (THz) region between the 1890s and 1970. There were countless more in the next 25 years. However, rather than dwelling on the well-documented surge of activity from the late 1950s onwards, due to such things as the arrival of digital computers for Fourier transform spectroscopy, helium-cooled detectors and long-wavelength lasers, this paper looks back to the very early years of research in this spectral region. The end date of 1923 is the year when the 'gap' between the far-infrared and electric waves (as they were then called) was closed. It is truly remarkable that so much was achieved with what was very basic technology.","PeriodicalId":13627,"journal":{"name":"Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89937335","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 : 2004-01-01DOI: 10.1109/ICIMW.2004.1422206
R. Beigang, A. Dobroiu, C. Otani, K. Kawase
A solid-state prism-shaped Fabry-Perot interferometer allows absorption measurements using a backward wave oscillator (BWO) continuous-wave source in the terahertz range. When a liquid sample is placed on the prism surface it affects the total internal reflection, thus it can be considered as being optically inside the cavity. The wavelength is scanned and the spectra obtained are Fourier analyzed for the absorption determination.
{"title":"Prism-shaped Fabry-Perot etalon for absorption measurement in the terahertz range","authors":"R. Beigang, A. Dobroiu, C. Otani, K. Kawase","doi":"10.1109/ICIMW.2004.1422206","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422206","url":null,"abstract":"A solid-state prism-shaped Fabry-Perot interferometer allows absorption measurements using a backward wave oscillator (BWO) continuous-wave source in the terahertz range. When a liquid sample is placed on the prism surface it affects the total internal reflection, thus it can be considered as being optically inside the cavity. The wavelength is scanned and the spectra obtained are Fourier analyzed for the absorption determination.","PeriodicalId":13627,"journal":{"name":"Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90003496","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}
Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.
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