本文關(guān)鍵詞：EAST托卡馬克穩(wěn)態(tài)氘彈丸注入觸發(fā)蛇形振蕩及L-H轉(zhuǎn)換的物理實驗研究　出處：《中國科學(xué)技術(shù)大學(xué)》2017年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 彈丸 加料 蛇形振蕩 L-H轉(zhuǎn)換 EAST

【摘要】：彈丸注入作為一種先進(jìn)的等離子體加料技術(shù),已經(jīng)被未來聚變裝置ITER選定為主要的加料手段。彈丸注入的作用不僅僅局限于簡單的等離子體加料,合理地利用彈丸注入甚至可以控制等離子體MHD行為和輸運。EAST裝置作為一個全超導(dǎo)托卡馬克裝置,發(fā)展了一套穩(wěn)態(tài)10Hz彈丸注入系統(tǒng),并利用該系統(tǒng)開展了一系列彈丸注入加料及等離子體控制的實驗研究。本論文首先針對EAST裝置上彈丸注入對等離子體基本行為的影響展開了研究,發(fā)現(xiàn)彈丸注入可以引起等離子體密度峰化和儲能的上升,證明了彈丸是一種優(yōu)秀的等離子體加料手段。進(jìn)一步實驗分析表明,EAST裝置上彈丸的等離子體加料效率(進(jìn)入等離子體中的彈丸粒子數(shù)/單個彈丸的總粒子量)大約為30%,而高場側(cè)注入能實現(xiàn)最高的等離子體加料,在理想情況下可以達(dá)到～40%。同時也發(fā)現(xiàn)隨著輔助加熱功率的升高,等離子體徑向漂移作用變強,彈丸的加料效率會有所下降,粒子在等離子體中滯留時間也會下降。此外,還對H模情況下彈丸注入引起的ELM行為進(jìn)行了簡要的分析,發(fā)現(xiàn)大尺寸彈丸注入可能會導(dǎo)致等離子體約束變差,甚至從H模退回到L模。這些初步的實驗結(jié)論為EAST裝置上開展更進(jìn)一步的實驗研究提供了參考和數(shù)據(jù)積累。而后針對彈丸注入對等離子體芯部MHD行為影響開展了深入的實驗研究,研究發(fā)現(xiàn)在歐姆加熱條件下彈丸穿越等離子體q=1面可以觸發(fā)強烈的芯部MHD行為——蛇形振蕩現(xiàn)象。彈丸觸發(fā)蛇形振蕩的基本原理是彈丸在q = 1面附近引入很大的密度和溫度擾動,幫助局域范圍內(nèi)形成磁島,并最終發(fā)展成為蛇形振蕩。EAST觀察到蛇形振蕩現(xiàn)象具有影響范圍廣,持續(xù)時間長的特點,需要結(jié)合阻尼撕裂模和分支螺旋平衡狀態(tài)理論才能合理解釋。彈丸觸發(fā)的蛇形振蕩的實驗研究是一種關(guān)于影響和控制等離子體芯部MHD行為的全新嘗試,對于未來相關(guān)的實驗研究具有指導(dǎo)意義。最后還開展了關(guān)于彈丸注入觸發(fā)L-H轉(zhuǎn)換的實驗研究,研究發(fā)現(xiàn)通過邊界彈丸的注入可以幫助等離子體邊界輸運壘的建立并使等離子體提前進(jìn)入H模。實驗中還發(fā)現(xiàn)EAST裝置上的彈丸注入能夠有效降低等離子體L-H轉(zhuǎn)換閾值功率10%,且通過估算邊界徑向電場的方式,證明了彈丸消融引起了等離子體邊界徑向電場剪切的增大,從而抑制了湍流并建立其邊界輸運壘,最終實現(xiàn)H模。彈丸觸發(fā)L-H轉(zhuǎn)換實驗研究能夠幫助了解L-H轉(zhuǎn)換期間等離子體各參數(shù)變化的因果關(guān)系,對于理解等離子體L-H轉(zhuǎn)換的深層機制具有極其重要的意義。通過EAST裝置上開展的彈丸注入實驗研究,充分證明了彈丸是一種先進(jìn)的等離子體加料和控制手段,同時也為未來ITER裝置開展彈丸物理實驗研究提供了數(shù)據(jù)積累。在上述實驗研究的基礎(chǔ)上未來將進(jìn)一步開展深層次的彈丸注入實驗研究,期待在未來得到更多更有意思的實驗結(jié)果。
[Abstract]:As an advanced plasma feeding technology, the injection of projectiles has been selected as the main means of feeding in the future fusion device ITER. The effect of projectile injection is not only limited to simple plasma feeding, it is reasonable to use the injection of projectiles to even control the MHD behavior and transport of plasma. As a fully superconducting tokamak device, EAST has developed a set of steady 10Hz projectile injection system, and has carried out a series of experimental research on pellet injection charging and plasma control using this system. In this paper, we first studied the influence of projectile injection on the basic behavior of plasma in the EAST device. It was found that the injection of a projectile can cause the plasma density to peak and the energy storage to rise. It is proved that the projectile is an excellent plasma feeding method. Further experiments show that the plasma fuelling efficiency on EAST device (projectile projectile into particles in plasma / total number of single particle projectile volume) is about 30%, while the high field side can achieve the highest plasma charging, in the ideal case can reach to 40%. Meanwhile, it is also found that with the increase of auxiliary heating power, the radial drift of plasma becomes stronger, and the feeding efficiency of pellets will decrease, and the residence time of particles in plasma will also decrease. In addition, a brief analysis of ELM behavior caused by projectile injection in H mode is also made. It is found that large scale projectile injection may lead to plasma confinement variation, and even retreat from H mode to L mode. These preliminary experimental conclusions provide reference and data accumulation for further experimental research on the EAST device. Then, the influence of projectile injection on the MHD behavior of plasma core is studied. It is found that under the ohmic heating condition, projectile traversing the plasma q=1 surface can trigger strong core MHD behavior -- serpentine oscillation. The basic principle of projectile triggered snake like oscillation is that a large density and temperature disturbance is introduced near the q = 1 surface, which helps to form Magnetic Island in the local area and eventually develop into snake like oscillation. EAST observed that the serpentine oscillation has wide influence and long duration. We need to combine the theory of damping tearing mode and branch helix equilibrium state theory to explain it reasonably. The experimental research of snake triggered oscillation triggered by projectile is a new attempt to influence and control the MHD behavior of plasma core, and has guiding significance for future related experimental research. Finally, we carried out an experimental research on projectile injection triggered L-H conversion. It was found that the injection of boundary projectile can help the establishment of plasma transport barrier and advance plasma into H mode ahead of time. It is found that the EAST device on the pellet injection can effectively reduce plasma L-H switching threshold power of 10%, and by estimating the radial electric field boundary, that caused the increase of plasma ablation boundary shear of the radial electric field, thus inhibiting the turbulence and the establishment of the edge transport barrier, finally realizes the H mode. Experimental research on projectile triggered L-H conversion can help to understand the causal relationship between plasma parameters during L-H conversion, and is of great significance for understanding the deep mechanism of plasma L-H transformation. The projectile injection experiment carried out on the EAST device fully proves that the projectile is an advanced plasma feeding and control means, and it also provides data accumulation for future ITER device projectile physics experiment research. On the basis of the above experimental research, we will further carry out deep projectile injection experimental research in the future, and expect to get more interesting experimental results in the future.
【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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