Search Results - "Shapiro, M.A"

Second harmonic operation at 460 GHz and broadband continuous frequency tuning of a gyrotron oscillator by Hornstein, M.K., Bajaj, V.S., Griffin, R.G., Kreischer, K.E., Mastovsky, I., Shapiro, M.A., Sirigiri, J.R., Temkin, R.J.

“…We report the short-pulse operation of a 460 GHz gyrotron oscillator both at the fundamental (near 230 GHz) and second harmonic (near 460 GHz) of electron…”
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Demonstration of a 140-GHz 1-kW Confocal Gyro-Traveling-Wave Amplifier by Joye, C.D., Shapiro, M.A., Sirigiri, J.R., Temkin, R.J.

“…The theory, design, and experimental results of a wideband 140-GHz 1-kW pulsed gyro-traveling-wave amplifier (gyro-TWA) are presented. The gyro-TWA operates in…”
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Progress on the Fabrication and Test of an Extended Interaction Klystron with a New Photonic Bandgap Topology by Stephens, J., Shapiro, M.A., Temkin, R.J.

“…Prior research regarding the development of a W-band extended interaction klystron (EIK) with a photonic bandgap (PBG) based interaction circuit suggests that…”
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Experimental Verification of Phase Retrieval of Quasi-Optical Millimeter-Wave Beams by Idei, H., Shimozuma, T., Shapiro, M.A., Notake, T., Kubo, S., Temkin, R.J.

“…The accuracy of a phase-retrieval procedure for microwave beams was analyzed and verified using an 84-GHz quasi-optical beam transmitted by a corrugated…”
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Operational characteristics of a 14-W 140-GHz gyrotron for dynamic nuclear polarization by Joye, C.D., Griffin, R.G., Hornstein, M.K., Kan-Nian Hu, Kreischer, K.E., Rosay, M., Shapiro, M.A., Sirigiri, J.R., Temkin, R.J., Woskov, P.P.

“…The operating characteristics of a 140-GHz 14-W long pulse gyrotron are presented. The device is being used in dynamic nuclear polarization enhanced nuclear…”
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Imaging of Atmospheric Air Breakdown Caused by a High-Power 110-GHz Pulsed Gaussian Beam by Hidaka, Y., Choi, E.M., Mastovsky, I., Shapiro, M.A., Sirigiri, J.R., Temkin, R.J.

“…We present the images of regular filamentary plasma arrays produced upon the breakdown of air at atmospheric pressure at the focal region of a high-power…”
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Phase retrieval of gyrotron beams based on irradiance moments by Anderson, J.P., Shapiro, M.A., Temkin, R.J., Denison, D.R.

“…We present the formulation of the moment method applied to the determination of phase profiles of microwave beams from known amplitudes. While traditional…”
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Experimental studies of local and global emission uniformity for a magnetron injection gun by Anderson, J.P., Temkin, R.J., Shapiro, M.A.

“…We report measurements of the azimuthal emission nonuniformity of a gyrotron's thermionic cathode as determined from two experiments; one which determines the…”
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Synthesis of gyrotron phase-correcting mirrors using irradiance moments by Shapiro, M.A., Anderson, J.P., Temkin, R.J.

“…A new approach using the moments of field amplitudes has been applied for phase-correcting mirror synthesis of a 110-GHz gyrotron internal mode converter. The…”
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Design of correcting mirrors for a gyrotron used at Large Helical Device by Shapiro, M.A, Chu, T.S, Denison, D.R, Sato, M, Shimozuma, T, Temkin, R.J

“…We report the design of a mirror system used at the Large Helical Device (LHD) to convert the output radiation of the CPI 84-GHz gyrotron into the HE 11 mode…”
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Design Of A 250 GHZ Photonic Bandgap Extended Interaction Klystron by Stephens, J., Shapiro, M.A., Temkin, R.J.

“…Production of millimeter wave and near-THz vacuum electron devices is largely limited by the ability to fabricate very small features on the order of tens of…”
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Do Environmental Policy Instruments Influence Fiduciaries' Decisions? by Haigh, Matthew M, Shapiro, Matthew A

“…This paper examines the import for fiduciary investors (pension funds, insurance companies, and mutual funds in OECD countries) of companies' environmental…”
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Overview of the ITER EC H&CD system and its capabilities by Omori, T., Henderson, M.A., Albajar, F., Alberti, S., Baruah, U., Bigelow, T.S., Beckett, B., Bertizzolo, R., Bonicelli, T., Bruschi, A., Caughman, J.B., Chavan, R., Cirant, S., Collazos, A., Cox, D., Darbos, C., de Baar, M.R., Denisov, G., Farina, D., Gandini, F., Gassmann, T., Goodman, T.P., Heidinger, R., Hogge, J.P., Illy, S., Jean, O., Jin, J., Kajiwara, K., Kasparek, W., Kasugai, A., Kern, S., Kobayashi, N., Kumric, H., Landis, J.D., Moro, A., Nazare, C., Oda, Y., Pagonakis, I., Piosczyk, B., Platania, P., Plaum, B., Poli, E., Porte, L., Purohit, D., Ramponi, G., Rao, S.L., Rasmussen, D.A., Ronden, D.M.S., Rzesnicki, T., Saibene, G., Sakamoto, K., Sanchez, F., Scherer, T., Shapiro, M.A., Sozzi, C., Spaeh, P., Strauss, D., Sauter, O., Takahashi, K., Temkin, R.J., Thumm, M., Tran, M.Q., Udintsev, V.S., Zohm, H.

“…The Electron Cyclotron (EC) system for the ITER tokamak is designed to inject ≥20 MW RF power into the plasma for Heating and Current Drive (H&CD)…”
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Thorpex research and the science of prediction by Parsons, D.B, Beland, M, Burridge, D, Bougeault, P, Brunet, G, Caughey, J, Cavallo, S.M, Charron, M, Davies, H.C, Niang, A. Diongue, Ducrocq, V, Gauthier, P, Hamill, T.M, Harr, P.A, C.Jones, S, Langland, R.H, Majumdar, S.J, Mills, B.N, Moncrieff, M, Nakazawa, T, Paccagnella, T, Rabier, F, Redelsperger, J.-L, Riedel, C, Saunders, R.W, Shapiro, M.A, Swinbank, R, Szunyogh, I, Thorncroft, C, Thorpe, A.J, Wang, X, Waliser, D, Wernli, H, Toth, Z

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Observation and Study of Low-Frequency Oscillations in a 1.5-MW 110-GHz Gyrotron by Cerfon, A.J., Eunmi Choi, Marchewka, C.D., Mastovsky, I., Shapiro, M.A., Sirigiri, J.R., Temkin, R.J.

“…We report the observation of low-frequency oscillations (LFOs) in the range 165-180 MHz in a 1.5-MW 110-GHz gyrotron operating in 3-mus pulses. The…”
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Design of a 460 GHz second harmonic gyrotron oscillator for use in dynamic nuclear polarization by Hornstein, M.K., Bajaj, V.S., Griffin, R.G., Kreischer, K.E., Mastovsky, I., Shapiro, M.A., Temkin, R.J.

“…We report the design of a gyrotron oscillator for continuous operation at 460 GHz at a power level of up to 50 W. The gyrotron oscillator will be used in…”
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Studies of the 1.5-MW 110-GHz gyrotron experiment by Anderson, J.P., Shapiro, M.A., Temkin, R.J., Mastovsky, I., Cauffman, S.R.

“…Results of a 1.5-MW 110-GHz short-pulse (3 /spl mu/s) gyrotron experiment are reported. The gyrotron magnetron injection gun operated at full voltage (96 kV)…”
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A tunable continuous-wave 330 GHz gyrotron for enhanced nuclear magnetic resonance by Torrezan, A.C., Shapiro, M.A., Sirigiri, J.R., Temkin, R.J.

“…Summary form only given. Dynamic nuclear polarization (DNP) is a technique used to enhance the signal-to-noise ratio in nuclear magnetic resonance (NMR)…”
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Design and emission uniformity studies of a 1.5-MW gyrotron electron gun by Anderson, J.P., Korbly, S.E., Temkin, R.J., Shapiro, M.A., Felch, K.L., Cauffman, S.

“…We present the design and initial operation of a 96-kV 40-A magnetron injection gun for a 1.5-MW 110-GHz gyrotron. A critical parameter for the successful…”
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Photonic bandgap (PBG) accelerator structure design by Marsh, R.A., Shapiro, M.A., Temkin, R.J.

“…The damping of wakefields is a critical issue in high gradient accelerators operating at high frequency. It is also very important in the next generation of…”
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