3mm二次谐波回旋振荡管设计与数值模拟

二次谐波回旋振荡管的互作用磁场比基波回旋振荡管的磁场降低了一半,从而降低了设计难度,具有广阔的应用前景。通过对单腔结构的W波段二次谐波回旋振荡管高频结构、起振电流、模式竞争以及注波互作用研究,确定了W波段TE02模二次谐波回旋振荡管的基本工作参数,通过粒子模拟(PIC)软件进行计算,在电子注电压为60kV,注电流为6A及速度比为1.5时,获得了67.5kW的输出功率和超过18%的效率,且工作稳定。     

微波管的功率和效率达到了新水平

由于微波管设计师能动性的增强,已经使行波管在ku波段连续波功率超过1千瓦,在100千兆赫连续波功率超过100瓦,而使回旋管在140千兆赫产生接近200千瓦的连续波功率。     

在28千兆赫频率上输出功率为200千瓦的脉冲和连续波回旋管

业已设计和制造了脉冲和连续波回旋振荡管,供等离子体核聚变实验中作电子回旋谐振加热使用。所设计的管子在28千兆赫频率上输出功率为200千瓦,电子注的电压为80千伏,电流为8安。设计的脉冲回旋管能在工作比为5％,脉宽达40毫秒的脉冲状态下工作。连续波回旋管已产生200千瓦的输出功率,效率为50％;它也可以在连续波输出功率为170千瓦,效率为52％的情况下工作。     

28GHz二次谐波回旋振荡管的自洽非线性计算

中等功率的连续波回旋管在工业领域有着重要的应用前景．本文对工作在28GHz频率的工业应用回旋振荡管进行了自洽非线性计算．结果表明,在二次谐波工作条件下,选取TE02模式,当电压为32kV、电流为6A时,可以获得连续波输出功率-50kW,效率-28％．     

W 波段低电压回旋振荡管的研究

文中通过对复合腔结构的W 波段二次谐波回旋振荡管高频结构、起振电流、模式竞争及注波互作用研究, 确定了工作模式为TE02-TE03 的W 波段低电压二次谐波回旋振荡管的基本工作参数。粒子模拟表明,应用25kV,4A, v⊥/v‖=1.6 的双阳极磁控注入枪时,该管能够在94GHz 频率产生26.6kW 的峰值输出功率,高于26%的效率。并且结果 表明,该管在该工作模式下工作稳定。     

高功率毫米波回旋器件实验研究

介质加载是解决回旋行波管振荡一个较好的方法,本文利用这种结构在Ka波段回旋行波管的实验中利用这种结构在工作模式TE01,加速电压66 kV,电子注电流13A得到了293 kW的峰值输出功率,最大增益56 dB,效率34.2％,3 dB带宽2.1 GHz的结果;介绍了W波段回旋行波管、回旋振荡管、Q波段回旋行波管的实验情况.     

220 GHz共焦波导回旋振荡管的理论研究与模拟仿真

随着毫米波波段回旋管的研究深入,传统的封闭式圆波导谐振腔的弊端越发明显。根据回旋管非线性理论,设计了一只采用开放式准光谐振腔作为高频结构的回旋振荡管,其工作频率为220 GHz、工作电压为60 k V、电流为3 A、横纵速度比α为1.5、工作模式为HE06模。通过采用自主研发的三维粒子模拟软件CHIPIC对其进行数值模拟研究,分析其工作特性,并进一步优化参数。仿真结果表明:所设计的回旋管在磁场为8.57 T的条件下工作,可获得36 k W的峰值功率输出,输出功率效率可达20%。     

连续波功率为200千瓦、频率为28千兆赫的回旋速调管的研制计划

本计划的日的,是研制能在28千兆赫频率产生200千瓦连续波功率的微波放大管或振荡管。管子应用了回旋谐振互作用效应。1978年第二季度,对设计的第二只连续波回旋振荡管进行了脉冲测试,峰值输出功率达132千瓦,平均输出功率达20千瓦。随后又对管子进行连续波测试,这时,管子工作在最大电子注功率640千瓦下,连续波输出功率为105千瓦。在这样的功率输出下,输出窗发生了热炸裂(Thermal break).在未改变设计的条件下重装了该管,并送至橡胶岭实验室使用,管子工作于50千瓦的连续波功率输出。     

用于回旋速调管的新型开放式球形谐振腔

作为毫米波、亚毫米波源的回旋速调管工作于W波段及以上波段时,如何提高输出功率和工作效率是回旋管研究的重点.对开放式球形腔TE谐振模式的特点进行了理论分析,并与圆柱谐振腔TE模式进行了比较,通过计算模拟对比了二者谐振腔的电场能量分布特点.与圆柱谐振腔TE021模式相比,在电子通过区域,开放式球形腔内TE102谐振模的高频...     

W波段边廊模回旋管Vlasov模式变换器的辐射场研究

采用几何光学模型详细研究了边廊模回旋管中Vlasov模式变换器的工作原理,利用等效像源模型结合矢量绕射理论分析了通过此模式变换器的辐射场.考虑W波段边廊模回旋管的具体参数,通过数值计算,讨论了通过Vlasov模式变换器后辐射波束的场分布特性.结果表明,Vlasov模式变换器将回旋管中的高阶边廊模式转换为自由空间的高斯模式,且远场的高斯场型较近场更好.     

3mm波段集成振荡器研究

描述了一种3mm波段集成振荡器,该振荡器由雪崩二极管、微带谐振器、阻抗匹配器、鳍线过渡组成.通过对3mm波段集成振荡器进行理论分析和实验研究,最终在国内首次采用3mm连续波雪崩二极管成功研制出微带集成振荡器,工作频率为94.78GHz,输出功率大于7mW.     

Design of a Ka Band 35 kW CW Low-Voltage Harmonic Gyrotron

In this paper, a continuous wave (CW) low-voltage second harmonic gyrotron with the conventional cavity has been preliminarily designed and evaluated with self-consistent nonlinear simulation code and the particle-in-cell code CHIPIC. The simulation results of the two codes are shown to be in agreement basically. The 35 kW CW output power of the designed harmonic gyrotron driven by a 25 kV 5.0A electron beam from a magnetron injection gun (MIG) is obtained. The maximum output power and the electronic efficiency of the gyrotron is about 35 kW and 30% respectively.     

W-band monolithic oscillator using InAlAs/InGaAs HEMT

A W-band monolithic integrated oscillator circuit was designed and fabricated using submicron HEMT technology. The oscillation frequency was around 81 GHz and the power was -7 dBm at the chip level. This is the first report of an InAlAs/InGaAs monolithic oscillator operating at the W-band.<>     

System Development and Performance Testing of a W-Band Gyrotron

A high-power W-band gyrotron has been designed and performance tested in Korea, with an output power in the range of tens of kilowatts. The gyrotron consists of a diode-type electron gun operating at 40 kV, a TE6,2 mode interaction cavity, and a mode converter for producing a highly Gaussian output mode beam. Presented here are the detailed component design procedure and the experimental results of the gyrotron’s performance evaluation. A maximum power of 62 kW was achieved with an efficiency of 22 %, and a highly Gaussian output beam was observed. The gyrotron’s output beam is analyzed, and its transmission through an oversized waveguide is discussed. This gyrotron is the first gyrotron developed in Korea with high power greater than 10 kW and high frequency greater than 90 GHz.     

A W-band Third Harmonic Gyrotron with an Iris Cavity

The design and experimental results of a W-band gyrotron operating at the third cyclotron harmonic are presented. The gyrotron is designed to operate at the TE₆₁ mode, which is significantly distinct from competing modes. An iris cavity is employed for the purpose of trapping the third harmonic mode more effectively and lowering its start current. In the experiment, the gyrotron is drived by a triode magnetron injection gun (MIG) which can produce a 45 kV, 3 A electron beam. When maximum axial magnetic field is 1.22 T, a single mode third harmonic gyrotron radiation is observed with the frequency of 94.86 GHz. The maximum output power is 5.5 kW, corresponding to an efficiency of 4%. Another third harmonic mode TE₀₂ is also detected at 88.8 GHz, with maximum output power of 1.5 kW.     

Axisymmetric quasi-optical gyrotron oscillator

An axisymmetric quasi-optical gyrotron (ASQUOTRON) is considered to realize a 10 MW, 150 GHz, CW oscillator required for an electron cyclotron resonance heating of a fusion plasma. The gyrotron has an axisymmetric mirror to be used as its optical cavity. It is shown that the axisymmetric mirror of relatively small radius (～20 cm) can be used in producing the 10 MW continuous wave with a tolerable mirror heat load (～0.5 kW/cm²). Considerations are also made on wave transmissions through the mirror and to a target.     

Development of a Compact sub-THz Gyrotron FU CW CI for Application to High Power THz Technologies

For application of high frequency gyrotron to high power THz technology, Gyrotron FU CW series is being developed in FIR FU. Gyrotron FU CW CI is developed as one of sub-THz gyrotrons included in the series. The advantage of the gyrotron is compactness using a compact superconducting magnet and compact power supply system, which makes the accesses of the gyrotron to applied large-scale devices easier and extends the applications of gyrotron to wider fields. The designed frequency and cavity mode are 394.5 GHz and TE₂₆ mode for application to the 600 MHz DNP-NMR spectroscopy. As the operation results, the frequency and the output power were 394.03 GHz and around 30 W, respectively, which are available for the application to the 600 MHz DNP-NMR measurement. In addition, this gyrotron can operate at many other frequencies and cavity modes for application to high power THz technologies in wide fields. In this paper, the design and the operation results including long pulse or CW mode are presented.     

三反射镜准光模式变换器的设计与模拟

本文设计了一种用于W 波段边廊模回旋振荡管的三反射镜准光模式变换器。该模式变换器由一个Vlasov 型螺旋 切口辐射器和三面聚焦反射镜构成,可以将回旋管输出的高阶模式高效地转换为准高斯模式。根据矢量绕射理论和物理 光学法编写了模拟仿真程序,并对辐射器和反射镜的空间辐射场进行了计算、优化和分析。计算结果表明：输出波束中 高斯基模的标量相关系数为97.9%,矢量相关系数为95.9%,转换效率达到了81.5%。     

Frequency Tunable Gyrotron FU CW VA for Measuring Hyperfine Split of Positronium

New uptapered cavity is designed for the gyrotron FU CW VA enhancing its tunability and enabling its use for measurements of the hyperfine split of positronium.