Research for effect of nuclear elastic scattering on neutral-beam-injection plasma heating and its analysis model

核弹性散射对中性束注入等离子体加热的影响及其分析模型研究

• 批准号: 16560723
• 负责人: MATSUURA Hideaki
• 金额: $ 1.66万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16560723/
• 关键词: nuclear elastic scattering; NBI heating; Boltzmann-Fokker-Planck equation; fractional energy deposition to ions; reaction rate coefficient; 高エネルギーイオン

The effects of nuclear elastic scattering (NES) on (a) energy transfer to plasma ions and electrons and (b) T(d,n)^4He fusion reaction rate coefficient, during neutral beam injection (NBI) and α-particle heating operations, are examined on the basis of the Boltzmann-Fokker-Planck (BFP) equations for deuteron, triton, beam ion and α-particle in deuterium-tritium (DT) thermonuclear plasmas.1.The enhancement in the fraction of the NBI heating power deposited to ions becomes appreciable when beam-injection energy is larger than 1 MeV. For low temperatures, high densities and long confinement times, the slowing down of an energetic ion by NES is intensified, and thus the energetic components in beam-ion and α-particle velocity distribution functions are relatively small. In such a case, the NES effect on fractional energy deposition to ions is hardly to appear. On the contrary for low densities and short confinement times, the NES effect is significant. When n_e【greater than or equal】4×10^<19> m^<-3>, τ_E【greater than or equal】3 sec and T=20keV, the degree of the enhancement is almost 9(4) % for 1.5-MeV NBI (3.5MeV α-particle) heating.2.Owing to the NES by fusion-produced α-particle knock-on tail is formed at 〜MeV energy range in fuel-ion distribution function. On the contrary, as a result of neutral-beam injection, 1〜2 orders large tail compared with those by α-particle appears in hundreds-keV energy range. The BFP calculation shows that the NES effect caused by injected beam on T(d,n)^4He reaction rate coefficient can be appreciable depending on plasma conditions. When P_<NBI>=20MW, E_<NBI>=1MeV,τ_E=3sec and T_e=20keV, the degree of the enhancement in T(d,n)^4He reaction rate coefficient reaches by about 7(3)% for n_e=2(4)×10^<19>m^<-3>.

基于氘核、氚核、束离子和 α 粒子的玻尔兹曼-福克-普朗克 (BFP) 方程，检查中性束注入 (NBI) 和 α 粒子加热操作期间核弹性散射 (NES) 对 (a) 能量转移到等离子体离子和电子以及 (b) T(d,n)^4He 聚变反应速率系数的影响 在氘-氚 (DT) 热核等离子体中。1.当束注入能量大于 1 MeV 时，沉积到离子的 NBI 加热功率部分的增强变得明显。对于低温、高密度和长约束时间，NES 对高能离子的减速作用增强，因此束离子和 α 粒子速度分布函数中的能量成分相对较小。在这种情况下，NES对离子能量沉积分数的影响几乎不出现。相反，对于低密度和短限制时间，NES 效应显着。当n_e【大于或等于】4×10^<19> m^<-3>、τ_E【大于或等于】3秒且T=20keV时，对于1.5-MeV NBI（3.5MeV α粒子）加热，增强程度几乎为9(4) %。2.由于聚变产生的NES，在〜MeV能量范围内形成了α粒子敲击尾。 燃料离子分布函数。相反，由于中性束注入，在数百keV能量范围内出现了比α粒子大1〜2个数量级的尾部。 BFP 计算表明，根据等离子体条件，注入束对 T(d,n)^4He 反应速率系数造成的 NES 效应可能是明显的。当P_<NBI>=20MW、E_<NBI>=1MeV、τ_E=3sec、T_e=20keV时，对于n_e=2(4)×10^<19>m^<-3>，T(d,n)^4He反应速率系数的增强程度达到约7(3)%。

项目成果

Ion Channeling by Nuclear Elastic Scattering and Its Effect on Neutral Beam Injection Heating in Thermonuclear Plasmas

核弹性散射的离子沟道及其对热核等离子体中性束注入加热的影响

• 发表时间: 2006
• 期刊: J.Plasma Fusion Res.Series Vol.7 (in press)
• 作者: H.Matsuura;Y.Nakao
• 通讯作者: Y.Nakao

Effect of Nuclear Elastic Scattering on Ion Heating Characteristics in Deuterium-Tritium Thermonuclear Plasmas

核弹性散射对氘氚热核等离子体中离子加热特性的影响

• 发表时间: 2006
• 期刊: Physics of Plasmas (in press)
• 作者: H.Matsuura;Y.Nakao
• 通讯作者: Y.Nakao

Effect of Nuclear Elastic Scattering on Ion Heating in Thermonuclear Plasmas

核弹性散射对热核等离子体中离子加热的影响

• 发表时间: 2006
• 期刊: Proc.of 21th IEEE Symposium on Fusion Engineering ISBN 1-4244-0150-X (CD-ROM)
• 作者: H.Matsuura;Y.Nakao
• 通讯作者: Y.Nakao

Effect of Nuclear Elastic Scattering on Plasma Confinement Condition in D^3He/Tokamak Fusion Energy systems

核弹性散射对D^3He/托卡马克聚变能系统等离子体约束条件的影响

• 发表时间: 2005
• 期刊: ICENES2005-Proceedings of 12th International Conference on Emerging Nuclear Energy Systems ISBN-90-7697-110-2 (CD-ROM)
• 作者: H.Matsuura;et al.
• 通讯作者: et al.

Effect of Nuclear elastic Scattering on Plasma Heating Characteristics in DT Thermonuclear Plasmas

DT热核等离子体中核弹性散射对等离子体加热特性的影响

• 发表时间: 2006
• 期刊: J.Plasma Physics Vol.13,No.6 (in press)
• 作者: H.Matsuura;Y.Nakao
• 通讯作者: Y.Nakao