本文關(guān)鍵詞：0.22THz折疊波導(dǎo)返波管理論和實(shí)驗(yàn)研究　出處：《清華大學(xué)》2015年博士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 太赫茲 返波管 折疊波導(dǎo) 一維模型 誤差分析 起振電流

【摘要】：太赫茲返波管(THz-BWO)是認(rèn)知、研究并利用太赫茲波的一個(gè)有力工具。隨著大電流陰極的發(fā)展和微細(xì)加工技術(shù)的普及,采用折疊波導(dǎo)(FW)慢波結(jié)構(gòu)和圓柱狀電子束的THz-BWO開(kāi)始成為一種可行的技術(shù)方案。論文針對(duì)0.22 THz折疊波導(dǎo)返波管(FW-BWO)進(jìn)行了理論分析,數(shù)值模擬和實(shí)驗(yàn)研究。提出了用于FW-BWO束波互作用分析的一維(1-D)理論,研究了束流光學(xué)系統(tǒng)發(fā)射熱初速的問(wèn)題,發(fā)展了非常規(guī)盒型窗的等效電路模型,并進(jìn)行了高頻樣管的實(shí)驗(yàn)研究。首先,論文建立并驗(yàn)證了有損折疊波導(dǎo)慢波結(jié)構(gòu)的等效電路模型。同時(shí)在考慮太赫茲高頻損耗,相對(duì)論效應(yīng),端部反射,空間電荷效應(yīng)的情況下,建立了描述FW-BWO中束波互作用的小信號(hào),大信號(hào)頻域理論模型及時(shí)域1-D理論模型。在此基礎(chǔ)上,進(jìn)一步發(fā)展了理論模型,使其可以考察非理想電子注和慢波不規(guī)則的影響,可以用于進(jìn)行快速的誤差分析。其次,在考慮相對(duì)論效應(yīng)的情況下建立了基于收斂性皮爾斯電子槍和傍軸電子束包絡(luò)軌跡方程,并討論了傍軸電子束在布里淵磁場(chǎng)下的聚束規(guī)律。然而,更進(jìn)一步研究發(fā)現(xiàn)橫向熱初速會(huì)顯著改變低導(dǎo)流系數(shù)電子槍電子注的運(yùn)行包絡(luò)。因此提出了將基于微擾法的經(jīng)典理論模型和考慮熱初速的數(shù)值模型相互對(duì)比,迭代修正的綜合設(shè)計(jì)方法。然后,論文討論了THz-BWO輸能結(jié)構(gòu)的理論模型:提出了采用藍(lán)寶石窗片的非常規(guī)盒型窗結(jié)構(gòu),并發(fā)展了研究該結(jié)構(gòu)的等效電路模型,討論了其中的諧振模式;對(duì)匹配負(fù)載中的衰減瓷電參數(shù)測(cè)試提出了一種簡(jiǎn)化的傳輸反射法;利用耦合波理論和場(chǎng)匹配理論發(fā)展了過(guò)渡段散射參數(shù)的計(jì)算方法。之后完成了對(duì)0.22 THz折疊波導(dǎo)返波管的整管理論、工程設(shè)計(jì)和高頻誤差分析,并探索了關(guān)鍵步驟的工藝方案。在束流光學(xué)系統(tǒng)和輸能系統(tǒng)的成功研制基礎(chǔ)上,加工測(cè)試了兩套不同高頻方案的高頻樣管,并開(kāi)展了實(shí)驗(yàn)研究。雖然理想模型指出返波管可能達(dá)到百毫瓦至瓦級(jí)的功率輸出,但主要由于慢波變形導(dǎo)致相速度零散以及電子注非理想的原因,兩套高頻樣管的起振電流相對(duì)工作電流都有不同程度的提高。最終,首次完成了0.22 THz折疊波導(dǎo)返波管的原理驗(yàn)證實(shí)驗(yàn),最高可以在17.47 kV下獲得12.22 mA的收集極電流,此時(shí)流通率為77%,重復(fù)頻率100 Hz,占空比為1/10,PM4測(cè)定峰值功率最高為36 mW,頻率約為0.229 THz。
[Abstract]:Terahertz backward wave oscillator (THz-BWO) is a cognitive research, and the use of a powerful tool for terahertz wave. With the development of high current cathode and microfabrication technology, using folded waveguide slow wave structure (FW) and cylindrical electron beam THz-BWO has become a feasible technical scheme aiming at 0.22 THz. Folded waveguide BWO (FW-BWO) by theoretical analysis, numerical simulation and experimental research. For one-dimensional analysis of FW-BWO beam wave interaction is proposed (1-D) theory, studies the beam thermal velocity of optical system development flow, the equivalent circuit model of unconventional box type window, and carried out experimental studies high frequency of the sample tube. Firstly, this paper establishes the lossy folded waveguide slow wave structure equivalent circuit model. At the same time considering the terahertz frequency loss, relativistic effect, end reflection, space charge effect, the establishment of the tracing Small signal in the FW-BWO beam wave interaction, frequency domain and time domain model theory 1-D theory model. On this basis, the further development of the theoretical model, which can influence the non ideal electron beam and slow wave and irregular, can be used for fast error analysis. Second, in considering the effect of relativity the case is established based on the convergence of the Pearce electron gun and paraxial electron beam envelope equation, and discusses the paraxial electron beam bunching in the Brillouin magnetic field law. However, further study found that the operational envelope of transverse thermal initial velocity will significantly change the low perveance electron gun electron beam. So the classic the theoretical model of perturbation method and numerical model considering mutual thermal initial velocity based on the integrated design method of modified iteration. Then, this paper discusses the theoretical model of THz-BWO power transmission structure was proposed by blue Unconventional box type window structure of gem window, and the equivalent circuit of the structure of the model, discussed the resonant mode; the matching attenuator electric parameter test of proposed transmission and reflection method of a simplified load calculation method; by using the coupled wave theory and field theory, the development of the scattering parameters the transition section. After completion of the 0.22 THz folded waveguide BWO tube theory, engineering design and analysis of high frequency error, and explores the key steps in the process. The beam optical system and transmission system can be successfully developed on the basis of test sample processing high frequency two different sets of high frequency scheme tube. Experimental researches are carried out. Although the ideal model indicates that the BWO may reach 100 MW power output to the watt level, but mainly due to the slow wave phase velocity and deformation due to scattered electron beam non ideal, two sets of high frequency tube The relative work starting current current are improved to different degrees. Finally, the completion of the first 0.22 THz folded waveguide BWO principle experiment, can get a maximum of 12.22 mA at 17.47 kV of the collector current, the flow rate was 77%, the repetition rate is 100 Hz, the duty ratio is 1/10, PM4 determination the highest peak power is 36 mW, the frequency is about 0.229 THz.

【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TN125
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本文編號(hào)：1423870