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.2004.1422242
I. A. Khrebtov, A. Tkachenko, K. V. Ivanov, D. A. Khokhlov, A. Nikolenko, V. Pindyurin, S. Karmanenko, O. Pakhomov, S. A. Larionov
Preliminary results of estimation and experimental modeling of separate of an absolute measuring instrument based on composite high-Tc superconducting (HTS) bolometer with electrical-substitution for soft X-ray synchrotron radiation (SR) in the range of 100-2500 eV are reported. For the estimation influence of absorbed-radiation on the temperature distribution on bolometer elements has been developed. The calculated percentage of losses of radiant energy depend on the energy of photons. Calculation and experimental modeling of the operation of HTS bolometer as a test sample with electronic negative electrothermal feedback was carried out to estimate the possibility of the decrease of time constant. The results of noise research of YBaCuO films on various substrates are reported. The estimations showed the possibility to design a standard detector with operating temperature near 80 K for measurements of X-ray power near 1 /spl mu/W with an accuracy of <1%.
{"title":"Estimation and experimental modeling of absolute measuring instrument based on composite HTS bolometer with electrical-substitution for soft X-ray synchrotron radiation","authors":"I. A. Khrebtov, A. Tkachenko, K. V. Ivanov, D. A. Khokhlov, A. Nikolenko, V. Pindyurin, S. Karmanenko, O. Pakhomov, S. A. Larionov","doi":"10.1109/ICIMW.2004.1422242","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422242","url":null,"abstract":"Preliminary results of estimation and experimental modeling of separate of an absolute measuring instrument based on composite high-Tc superconducting (HTS) bolometer with electrical-substitution for soft X-ray synchrotron radiation (SR) in the range of 100-2500 eV are reported. For the estimation influence of absorbed-radiation on the temperature distribution on bolometer elements has been developed. The calculated percentage of losses of radiant energy depend on the energy of photons. Calculation and experimental modeling of the operation of HTS bolometer as a test sample with electronic negative electrothermal feedback was carried out to estimate the possibility of the decrease of time constant. The results of noise research of YBaCuO films on various substrates are reported. The estimations showed the possibility to design a standard detector with operating temperature near 80 K for measurements of X-ray power near 1 /spl mu/W with an accuracy of <1%.","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":"90226527","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.2004.1421966
F. Keilmann, M. Brehm
A novel type of FTIR spectroscopy based on two coherent frequency combs is demonstrated. All-electronic interferogram recording allows simultaneous amplitude and phase spectra, and fast spectrum acquisition in 100 /spl mu/s (1 /spl mu/s anticipated), enabling single-event analysis. Diffraction-limited propagation suggests use in remote sensing, classical microscopy and scattering-type near-field microscopy.
{"title":"Coherent-beam FTIR spectrometer with no moving parts","authors":"F. Keilmann, M. Brehm","doi":"10.1109/ICIMW.2004.1421966","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1421966","url":null,"abstract":"A novel type of FTIR spectroscopy based on two coherent frequency combs is demonstrated. All-electronic interferogram recording allows simultaneous amplitude and phase spectra, and fast spectrum acquisition in 100 /spl mu/s (1 /spl mu/s anticipated), enabling single-event analysis. Diffraction-limited propagation suggests use in remote sensing, classical microscopy and scattering-type near-field microscopy.","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":"90444704","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.2004.1422133
J. Kitagawa, Y. Sato, Y. Kadoya, M. Yamanishi, T. Takabatake
We have applied THz time-domain (TD) attenuated total reflection (ATR) spectroscopy to a heavy fermion compound CeNiSn aiming at revealing a potential for an ultrafast opto-magnetic device the principle of which is based on the Kondo effect. The well-behaved frequency dependence of the phase of the ATR signal is clearly demonstrated.
{"title":"THz time-domain ATR spectroscopy of heavy fermion compounds","authors":"J. Kitagawa, Y. Sato, Y. Kadoya, M. Yamanishi, T. Takabatake","doi":"10.1109/ICIMW.2004.1422133","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422133","url":null,"abstract":"We have applied THz time-domain (TD) attenuated total reflection (ATR) spectroscopy to a heavy fermion compound CeNiSn aiming at revealing a potential for an ultrafast opto-magnetic device the principle of which is based on the Kondo effect. The well-behaved frequency dependence of the phase of the ATR signal is clearly demonstrated.","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":"89706541","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.2004.1422247
K. Avramides, J. Vomvoridis, B. Piosczyk, C. Iatrou
We discuss the possibility of a proof-of-principle experiment regarding the excitation of a high-order mode interacting with the electrons at the second harmonic of the cyclotron frequency in a coaxial gyrotron cavity with a longitudinally corrugated inner conductor. The experiment employs the 2 MW-170 GHz coaxial gyrotron for ITER at Forschungszentrum Karlsruhe, Germany, which is designed to operate with the TE/sub 34,19/ mode at the fundamental cyclotron frequency. Our study suggests that by using about half the magnetic field and modifying the coaxial cavity to a reasonable extent, the TE/sub 34,19 /mode (or some other mode of similar eigenvalue) can be excited at 170 GHz as a second-harmonic mode.
{"title":"Second-harmonic operation of coaxial gyrotrons - towards a proof-of-principle experiment","authors":"K. Avramides, J. Vomvoridis, B. Piosczyk, C. Iatrou","doi":"10.1109/ICIMW.2004.1422247","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422247","url":null,"abstract":"We discuss the possibility of a proof-of-principle experiment regarding the excitation of a high-order mode interacting with the electrons at the second harmonic of the cyclotron frequency in a coaxial gyrotron cavity with a longitudinally corrugated inner conductor. The experiment employs the 2 MW-170 GHz coaxial gyrotron for ITER at Forschungszentrum Karlsruhe, Germany, which is designed to operate with the TE/sub 34,19/ mode at the fundamental cyclotron frequency. Our study suggests that by using about half the magnetic field and modifying the coaxial cavity to a reasonable extent, the TE/sub 34,19 /mode (or some other mode of similar eigenvalue) can be excited at 170 GHz as a second-harmonic mode.","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":"86704812","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.2004.1421977
K. Sakamoto, A. Kasugai, R. Minami, K. Takahashi, N. Kobayashi, T. Imai
The development of a 170 GHz gyrotron is underway for the ITER application. Up to now, experimental results of 0.5 MW/100 sec, 0.9 MW/9.2 sec were demonstrated. For a stable 1 MW/CW operation, the gyrotron and test facility are under modification: an efficiency improvement of built-in mode converter, beam current control with a pre-programmed control of a cathode heater power, and voltage between an anode and a cathode for constant output power. These contributes to the further stable 1 MW power output in long pulse operation.
{"title":"Development of high power 170 GHz gyrotron for ITER","authors":"K. Sakamoto, A. Kasugai, R. Minami, K. Takahashi, N. Kobayashi, T. Imai","doi":"10.1109/ICIMW.2004.1421977","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1421977","url":null,"abstract":"The development of a 170 GHz gyrotron is underway for the ITER application. Up to now, experimental results of 0.5 MW/100 sec, 0.9 MW/9.2 sec were demonstrated. For a stable 1 MW/CW operation, the gyrotron and test facility are under modification: an efficiency improvement of built-in mode converter, beam current control with a pre-programmed control of a cathode heater power, and voltage between an anode and a cathode for constant output power. These contributes to the further stable 1 MW power output in long pulse operation.","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":"86710856","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.2004.1422295
K. Takahashi, S. Illy, R. Heidinger, A. Kasugai, R. Minami, K. Sakamoto, T. Imai, M. Thumm
Resent results of a diamond window development for an electron cyclotron heating (ECH) system are reported. High power millimeter wave transmission experiment of a neutron irradiated diamond window shows that loss tangent doubles and thermal conductivity decreases to approximately half. It is, however, verified that the irradiated window is applicable to a fusion reactor like the International Thermonuclear Experimental Reactor (TIER). In terms of reliability on the window structure, a diamond window with a copper (Cu) coated edge is developed. Thickness of the Cu layer is 0.5 mm. High power mm-wave transmission experiment of the Cu-coated window shows that the edge cooling is effective for an 1 MW transmission even if the edge is covered by the Cu layer.
{"title":"Recent results of ECH diamond window development","authors":"K. Takahashi, S. Illy, R. Heidinger, A. Kasugai, R. Minami, K. Sakamoto, T. Imai, M. Thumm","doi":"10.1109/ICIMW.2004.1422295","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422295","url":null,"abstract":"Resent results of a diamond window development for an electron cyclotron heating (ECH) system are reported. High power millimeter wave transmission experiment of a neutron irradiated diamond window shows that loss tangent doubles and thermal conductivity decreases to approximately half. It is, however, verified that the irradiated window is applicable to a fusion reactor like the International Thermonuclear Experimental Reactor (TIER). In terms of reliability on the window structure, a diamond window with a copper (Cu) coated edge is developed. Thickness of the Cu layer is 0.5 mm. High power mm-wave transmission experiment of the Cu-coated window shows that the edge cooling is effective for an 1 MW transmission even if the edge is covered by the Cu layer.","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":"87898766","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.2004.1422094
Kai Liu, Jingzhou Xu, X. Zhang
We report the experimental results of using GaSe crystals for the tunable broadband detection of terahertz (THz) waves from 100 GHz to 30 THz. The results indicate that a GaSe crystal is a good sensor crystal for broadband THz waves with a 10 fs laser system. In comparison, the THz wave field amplitude measured with a GaSe crystal exceeds that detected by a ZnTe crystal with comparable detection bandwidth. The central frequency of THz pulses detected by the GaSe crystal is tunable by tilting the angle about the vertical axis, which is perpendicular to the direction of the probe beam. This suggests that GaSe can be also used as a narrowband detector.
{"title":"Broadband THz detection using GaSe crystals","authors":"Kai Liu, Jingzhou Xu, X. Zhang","doi":"10.1109/ICIMW.2004.1422094","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422094","url":null,"abstract":"We report the experimental results of using GaSe crystals for the tunable broadband detection of terahertz (THz) waves from 100 GHz to 30 THz. The results indicate that a GaSe crystal is a good sensor crystal for broadband THz waves with a 10 fs laser system. In comparison, the THz wave field amplitude measured with a GaSe crystal exceeds that detected by a ZnTe crystal with comparable detection bandwidth. The central frequency of THz pulses detected by the GaSe crystal is tunable by tilting the angle about the vertical axis, which is perpendicular to the direction of the probe beam. This suggests that GaSe can be also used as a narrowband detector.","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":"85832521","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.2004.1422240
Y. Tsarin
A "disk" model for a beam above a planar corrugated structure is considered. Under the assumption of a uniformly-charged transverse cross-section beam, the static Green's function for the uniformly charged interacting disks is derived analytically in the general case without using the properties of a concrete mapping for a specific structure. The coordinate-dependent plasma frequency reduction coefficients and their application for the beam-field interaction in microwave devices are introduced and discussed.
{"title":"Coordinate-dependent plasma frequency reduction coefficients for planar corrugated periodic structures","authors":"Y. Tsarin","doi":"10.1109/ICIMW.2004.1422240","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422240","url":null,"abstract":"A \"disk\" model for a beam above a planar corrugated structure is considered. Under the assumption of a uniformly-charged transverse cross-section beam, the static Green's function for the uniformly charged interacting disks is derived analytically in the general case without using the properties of a concrete mapping for a specific structure. The coordinate-dependent plasma frequency reduction coefficients and their application for the beam-field interaction in microwave devices are introduced and discussed.","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":"87477646","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.2004.1422071
G. Gantenbein, V. Erckmann, W. Kasparek, B. Plaum, H. Laqua, G. Michel, K. Schworer, A. Bruschi, S. Cirant, F. Gandini, A. Verhoeven
The major step in the development of tokamaks towards fusion power plants is the International Thermonuclear Experimental Reactor (ITER). This machine is equipped with an electron cyclotron resonance heating (ECRH) system which can be applied for very localised heating of the plasma or for current drive (ECCD) in the plasma. High power tests of a remote steering launcher system have performed successfully with a four side corrugated square waveguide operated under atmospheric pressure. The thermographic image of the beam on the absorbing screen and the heating of the waveguide wall during a long pulse shot waveguide has been recorded with an IR camera at 170 GHz.
{"title":"First high-power tests of a remote steering concept for ECRH/ECCD at ITER","authors":"G. Gantenbein, V. Erckmann, W. Kasparek, B. Plaum, H. Laqua, G. Michel, K. Schworer, A. Bruschi, S. Cirant, F. Gandini, A. Verhoeven","doi":"10.1109/ICIMW.2004.1422071","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422071","url":null,"abstract":"The major step in the development of tokamaks towards fusion power plants is the International Thermonuclear Experimental Reactor (ITER). This machine is equipped with an electron cyclotron resonance heating (ECRH) system which can be applied for very localised heating of the plasma or for current drive (ECCD) in the plasma. High power tests of a remote steering launcher system have performed successfully with a four side corrugated square waveguide operated under atmospheric pressure. The thermographic image of the beam on the absorbing screen and the heating of the waveguide wall during a long pulse shot waveguide has been recorded with an IR camera at 170 GHz.","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":"77495175","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.2004.1422058
M. Blank, P. Borchard, S. Cauffman, K. Felch
The continuing need for high-power, broadband sources of millimeter-wave radiation has led to extensive research in the area of gyrotron amplifiers. Several key issues in the design and development of gyro-amplifiers, including stability, bandwidth, high-average power capability, operation in high-order modes, and driver availability, are discussed. State-of-the-art Ka- and W-band gyro-amplifiers, each of which has addressed one or more of these key issues, are described.
{"title":"Millimeter-wave gyro-amplifiers: principles and state-of-the-art","authors":"M. Blank, P. Borchard, S. Cauffman, K. Felch","doi":"10.1109/ICIMW.2004.1422058","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422058","url":null,"abstract":"The continuing need for high-power, broadband sources of millimeter-wave radiation has led to extensive research in the area of gyrotron amplifiers. Several key issues in the design and development of gyro-amplifiers, including stability, bandwidth, high-average power capability, operation in high-order modes, and driver availability, are discussed. State-of-the-art Ka- and W-band gyro-amplifiers, each of which has addressed one or more of these key issues, are described.","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":"86182002","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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