Establishment of MeV Range Heavy Ion beam Probe Diagnostic

(1)为了研究CHS装置中的密度波动，安装了用于次级束的十二通道检测器阵列，其中使用偏置电极来抑制由于等离子体光而从检测器板发射的次级电子。然而，由于探测器阵列周围的螺旋磁场结构，抑制二次电子不能实现与一个共同的偏置电压。每个探测器板都应有自己的偏置电极。(2)在CHS实验中观察到了等离子体电势的动态行为。这种现象被认为是由于径向粒子通量与径向电场之间的非线性关系引起的一种相变。该结果为等离子体物理和磁约束引入了新的见解，并在美国IEEE组织的国际等离子体物理会议（ICPP 98）和国际等离子体科学会议（ICOPS 98）上作为特邀演讲发表。(3)国家聚变科学研究所和乌克兰哈尔科夫物理和技术研究所的两个HIBP小组提议并同意在西班牙CIEMAT的TJ = II Heliac重离子束探测器方面进行国际合作。(4)在JIPPT-IIU上用多道分裂板探测器进行的HIBP测量表明了HIBP对密度和空间势涨落的空间相关测量的能力。

(1) In order to study density fluctuations in the CHS device , a twelve - channel detector array for secondary beams was installed , in which a biasing electrode to suppress secondary electrons emitted from the detector plates due to plasma light was used . However , because of helical magnetic field structure around the detector array , suppression of secondary electrons could not be achieved with a common biasing voltage . Each detector plate should have its own biasing electrode .(2) Dynamic behaviors of plasma potential have been observed in the CHS experiment . This new phenomenon in a toroidal helical plasma is understood as a kind of phase transition caused by nonlinear relation between radial particle flux and radial electric field . The result introduced new insight for plasma physics and magnetic confinement and was presented as invited talks at the International Conference on Plasma Physics ( ICPP98 ) and the International Conference on Plasma Science ( ICOPS98 ) organized by IEEE in US.(3) International collaboration on the heavy ion beam probe for the TJ = II Heliac at CIEMAT , Spain has been proposed and agreed between the two HIBP teams at the National institute for Fusion Science and the Kharkov Institute for Physics and Technology , Ukraine .(4) The HIBP measurements on JIPPT - IIU with multi - channel split - plate detectors demonstrated the power of HIBP for spatial correlation measurement on both density and space potential fluctuations .