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The Gytrotron FU CW III using a 20 T superconducting magnet has been developed as a radiation source in the THz region. Gyrotron radiations were observed in the magnetic field intensity region higher than 19.25 T, The frequency of the radiation is expected to exceed 1 THz. The highest measured frequency is 670.62 GHz using the frequency measurement system consisting of a harmonic mixer and a spectrum...
For DNP-NMR spectroscopy, we need high power sub-THz radiation sources with the output power of several tens watts. We have developed Gyrotrons FU CW VII operating in 200 GHz band and 400 GHz band as radiation source for 600 MHz and 300 MHz DNP-NMR spectroscopy. We have installed it at University of Warwick. UK and begun the DNP-NMR measurement.
A Gytrotron FU CW III using a 20 T superconducting magnet has been developed as a radiation source in the THz region. At the first experiment, several radiation by fundamental operation were observed and measured frequencies.
Development of high frequency cw gyrotrons (Gyrotron FU CW Series) as high power far-infrared radiation sources was advanced in FIR FU on the basis of the success in the development and application of the previous Gyrotron FU series. In this paper, we would introduce the development and applications of high frequency gyrotrons in FIR FU, including application to high power THz technologies.
A high power THz radiation source is needed to analyze the structures of complex proteins by DNP-NMR spectroscopy. For this objective, we have been developing gyrotrons having boardband frequency tunability using a long cavity. Prototype gyrotron was achieved with a tuning range of 1.6 GHz and exceeded output power of 10 W.
Two sealed-off gyrotron tubes for high power THz spectroscopy are designed and constructed. One of them will be used for ESR echo experiment in sub-THz region, and another for 600 MHz DNP-NMR experiment etc. Both gyrotrons are named Gyrotron FU CW IIA and Gyrotron FU CW VIIA, because their cavities have same shapes as Gyrotrons FU CW II and FU CW VII. Both tubes are installed in 8T superconducting...
We have developed the Gyrotron FU CW VII for 300 MHz and 600 MHz DNP-NMR spectroscopy. For high frequency DNP-NMR experiment, high power sub-THz radiation sources are required. Gyrotron is able to emit enough power and appropriate frequency in sub-THz region for DNP. This Gyrotron emits electromagnetic waves with high power and appropriate frequency for each DNP-NMR spectroscopy (used cavity modes...
Both stenting (S) and directional atherectomy (DCA) have recently been proposed as reasonable alternatives to CABG for patients (pts) with unprotected left main stenoses (ULMS). To ascertain outcomes for pts at different CABG risk we queried a registry of 229 consecutively treated non acute MI pts treated at 25 centers since 1/94. Angios were core lab reviewed with 75% late follow up. 13% of inoperable...
Unprotected left main coronary artery (ULMCA) angioplasty has been considered to be contraindicated. Recent studies suggest that new devices improved its results with relatively small number of patients and short-term follow-up. We analyzed our data of ULMCA angioplasty and evaluated its feasibility and effectiveness.Methods: Between 286 to 897, consecutive 145 procedures in 94 patients with ULMCA...
Background: Wiktor (W) stent is easy to deliver with low risk of ''stent jail'', that is superior to Palmaz-Schatz (PS) stent. However, there remains the problem of the treatment of in-stent restenosis. We analyzed efficacy and safety of balloon angioplasty (BA) of W stent restenosis compared to PS stent restenosis.Methods: We implanted 320 W stents and 510 PS stents between 492 and 1296, and 58...
The durability of mitral valve repaired with reconstructive techniques is variable. If the durability continues to be good, mitral valve repair may be the procedure of choice in many patients with mitral regurgitation. Between December 1970 and June 1993, 54 patients had mitral valve repair for non-rheumatic mitral regurgitation. There were 38 men and 16 women with a mean age of 46.8 (range 19–68)...
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