本文選題：離子回旋共振加熱 + 鑒相器�。� 參考：《中國科學(xué)技術(shù)大學(xué)》2017年博士論文

【摘要】：離子回旋共振加熱是EAST超導(dǎo)托卡馬克核聚變實驗裝置加熱等離子體的重要手段之一,被視為芯部等離子體加熱和電流驅(qū)動的首選手段。它不僅可以加熱電子、離子,還用來控制等離子體某些重要參數(shù)的空間分布和產(chǎn)生等離子體極向電流,以及驅(qū)動等離子體等。理論計算和實驗研究表明,離子回旋天線運行在(0,π)相位時,具有較好的加熱效果且產(chǎn)生相對較小的雜質(zhì)。另外,天線在(0,π/2)相位運行時可以驅(qū)動不對稱譜,有利于電流驅(qū)動的研究。未來在ITER裝置上,離子回旋電流驅(qū)動將作為驅(qū)動芯部電流的重要手段,因而離子回旋天線相位的測量和精確控制無論對于離子回旋加熱還是驅(qū)動研究都有著重要的意義,如果天線的相位不能夠精確測量并加以控制,則可能導(dǎo)致天線電流帶之間的功率不平衡,影響加熱效果。在EAST放電實驗過程中,等離子體的阻抗是隨著時間變化著的,這就造成了離子回旋共振加熱系統(tǒng)射頻注入功率的波動。在本研究之前,主要是通過手動改變信號源的輸出幅度來調(diào)節(jié)發(fā)射機的輸出功率,在等離子體放電的一炮之內(nèi),雖然信號源的幅度保持不變,但是發(fā)射機的輸出功率卻呈現(xiàn)很大的波動,因而無法實現(xiàn)輸出功率的精確控制。本課題的研究內(nèi)容主要是實現(xiàn)對ICRH系統(tǒng)射頻波相位和功率的測量以及閉環(huán)反饋控制。論文中對比了幾種不同的相位和功率測量方法,在已有的AD8302鑒相器的基礎(chǔ)上設(shè)計了基于HMC439芯片的鑒相器,該鑒相器具有寬的測量范圍(720°)和低的相位噪聲,另外好的線性度也給后續(xù)的數(shù)據(jù)處理帶來了方便。相位與功率測控系統(tǒng)基于FPGA主控制器,由信號采集板卡和反饋控制板卡組成,信號采集板卡主要負責(zé)對相位和功率輸入信號的調(diào)理以及模數(shù)轉(zhuǎn)換,最終在FPGA內(nèi)部完成數(shù)據(jù)的擬合計算。反饋控制板的功能是實現(xiàn)對相位和功率的實時反饋控制以及與上位機的通信。我們使用Labview軟件來開發(fā)上位機程序,而上位機與控制機箱之間的數(shù)據(jù)收發(fā)通信是通過USB協(xié)議實現(xiàn)的。通過軟硬件的設(shè)計和反饋算法的不斷優(yōu)化,相位與功率反饋控制系統(tǒng)分別在假負載和等離子體放電環(huán)境下完成測試,目前已成功應(yīng)用于2016年的EAST實驗,在負載阻抗變化的情況下,相位和功率根據(jù)閉環(huán)反饋算法,自動穩(wěn)定在上位機設(shè)定的目標(biāo)值,為功率和相位調(diào)制實驗的開展奠定了基礎(chǔ)。
[Abstract]:Ion cyclotron resonance heating is one of the most important methods for plasma heating in EAST superconducting tokamak nuclear fusion device and is regarded as the preferred method for core plasma heating and current driving. It can not only heat electrons and ions, but also control the spatial distribution of some important parameters of plasma, generate plasma poloidal current, and drive plasma. The theoretical calculation and experimental study show that the ion cyclotron antenna has good heating effect and relatively small impurity when it operates in the phase of 0, 蟺. In addition, the asymmetric spectrum can be driven by the antenna in the phase of 0, 蟺 / 2, which is beneficial to the research of current drive. In the future, ion cyclotron current drive will be an important means of driving core current in ITER device. Therefore, the phase measurement and accurate control of ion cyclotron antenna is of great significance for ion cyclotron heating and driving research. If the phase of the antenna can not be accurately measured and controlled, it may lead to the imbalance of the power between the current bands of the antenna and affect the heating effect. During the EAST discharge experiment, the impedance of the plasma changes with time, which results in the fluctuation of RF implantation power in the ion cyclotron resonance heating system. Prior to this study, the output power of the transmitter was mainly adjusted by manually changing the output amplitude of the signal source, although the amplitude of the signal source remained unchanged within the first gun of the plasma discharge. However, the output power of the transmitter fluctuates greatly, so it is impossible to control the output power accurately. The main content of this thesis is to measure the phase and power of RF wave in ICRH system and to control the closed loop feedback. In this paper, several different phase and power measurement methods are compared. A phase detector based on HMC439 chip is designed on the basis of existing AD8302 phase discriminator, which has wide measurement range (720 擄) and low phase noise. In addition, good linearity also brings convenience to the subsequent data processing. The phase and power measurement and control system is based on FPGA main controller, which is composed of signal acquisition card and feedback control board. The signal acquisition board is mainly responsible for the phase and power input signal conditioning and analog-to-digital conversion. Finally, the data fitting calculation is completed in FPGA. The function of the feedback control board is to realize the real-time feedback control of the phase and power and to communicate with the host computer. We use Labview software to develop upper computer program, and the communication between host computer and control box is realized by USB protocol. Through the design of hardware and software and the continuous optimization of feedback algorithm, the phase and power feedback control system is tested under the false load and plasma discharge environment, respectively. It has been successfully applied to the EAST experiment in 2016. In the case of load impedance variation, the phase and power are automatically stabilized in the target value set by the host computer according to the closed-loop feedback algorithm, which lays a foundation for the development of power and phase modulation experiments.
【學(xué)位授予單位】：中國科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：TL631.24

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本文編號：1827667