AORSA full wave calculations of helicon waves in DIII-D and ITER
AORSA full wave calculations of helicon waves in DIII-D and ITER
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DOI：
10.1088/1741-4326/aab96d
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发表时间：
2018-04
期刊：
影响因子：
3.3
通讯作者：
C. Lau;E. Jaeger;N. Bertelli;L. Berry;D. Green;M. Murakami;J. M. Park;R. Pinsker;R. Prater
中科院分区：
文献类型：
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作者：
C. Lau;E. Jaeger;N. Bertelli;L. Berry;D. Green;M. Murakami;J. M. Park;R. Pinsker;R. Prater
螺旋波最近被提议作为DIII-D、FNSF和DEMO等装置的离轴电流驱动致动器。以前的射线跟踪模型使用GENRAY预测强单程吸收和电流驱动的中半径区域的DIII-D在高β托卡马克放电。用适用于拉莫尔半径各阶、能分辨任意离子回旋谐波的全波程序AORSA验证了射线追迹技术的有效性。如果在模拟中忽略刮除层（SOL），AORSA同意GENRAY在DIII-D和ITER情况下的驱动电流的幅度和位置。这些模型还表明，螺旋电流驱动器可能是一个有效的电流驱动器的ITER。之前的GENRAY分析不包括SOL。AORSA也被用来扩展模拟，包括SOL和估计可能的功率损失的螺旋波在SOL。AORSA计算表明，另一种模式可以在SOL中传播，并在高SOL密度下导致显著（~10%-20%）SOL损失。优化SOL密度分布可以将这些SOL损失减少到几个百分点。
Helicon waves have been recently proposed as an off-axis current drive actuator for DIII-D, FNSF, and DEMO tokamaks. Previous ray tracing modeling using GENRAY predicts strong single pass absorption and current drive in the mid-radius region on DIII-D in high beta tokamak discharges. The full wave code AORSA, which is valid to all order of Larmor radius and can resolve arbitrary ion cyclotron harmonics, has been used to validate the ray tracing technique. If the scrape-off-layer (SOL) is ignored in the modeling, AORSA agrees with GENRAY in both the amplitude and location of driven current for DIII-D and ITER cases. These models also show that helicon current drive can possibly be an efficient current drive actuator for ITER. Previous GENRAY analysis did not include the SOL. AORSA has also been used to extend the simulations to include the SOL and to estimate possible power losses of helicon waves in the SOL. AORSA calculations show that another mode can propagate in the SOL and lead to significant (~10%–20%) SOL losses at high SOL densities. Optimizing the SOL density profile can reduce these SOL losses to a few percent.