Monthly Archives: July 2019

2019年7月31日 五室第115期研讨会

2019年7月31日 五室第115期研讨会  

题  目:Computing the Double-Gyroaverage Term Incorporating Short-Scale Perturbation and SteepEquilibrium Profile by the Interpolation Algorithm

报告人:张双喜 博士

   间: 2019年7月31日(星期三)  9:00—10:30

   点: 4楼中间会议室


2019年7月26日 五室第114期研讨会

题 目:The Geodesic Acoustic Eigenmode in toroidally rotating tokamaks 报告人: 周登 研究员
时 间: 2019年7月26日(星期五) 14:30—15:20
地 点: 4楼中间会议室

2019年7月17日 五室第113期研讨会

题  目:The correct cutoff vsriable for integrals with the Rutherford differential cross-section.

报告人:常永斌 教授

时  间:2019年7月17日(星期三)  9:00—10:00

地  点:4楼中间会议室


2019年7月5日 五室第112期研讨会

201975 五室第112期研讨会

题  目:日韩模拟会议简单介绍


时  间:2019年7月5日(星期五)  14:30—15:30

地  点:6楼中间会议室

摘  要:

  汇报本次参加Japan-Korea workshop on “Modeling and Simulation of Magnetic Fusion Plasmas”的会议内容。主要是日本方面的报告内容。日本目前的模拟工作基本上都是基于自己开发的程序,本次会议的主要报告内容偏重于动理学问题,具体研究方向涵盖了磁约束等离子体中的湍流,新经典输运以及合成诊断等。希望通过本次介绍,让大家了解日本同行的部分研究进展,并讨论可能开展的合作方向。


2019年7月2日 五室第111期研讨会

201972 五室第111期研讨会

题  目:Plasma Theory Connections to Quantum Information Science

报告人Prof. Scott Parker  ( University of Colorado)

 时  间:2019年7月2日(星期二)  14:00—15:00

地  点:601会议室

摘  要:

The potential impact of quantum information science (QIS) on large-scale computing is tantalizing due to the capability to manipulate 2^N complex numbers where N is the number of qubits.  Even for N=60, one approaches exascale. Additionally, Moore’s law scaling, nearing 5 nm scale, is approaching physical limits. Present day experimental quantum computers are very modest in terms of size and general capability. Whether they may someday be useful for large-scale computation is unknown due to fundamental constraints.  Efficient operations are linear.  Copying data is approximate.  Measurement, or obtaining output is expensive. Here we present two research areas where QIS and plasma theory overlap in interesting ways: 1) quantum algorithms solving the Vlasov equation, and 2) direct numerical simulation of ultra-cold non-neutral ion plasmas used in QIS.  We have developed a quantum algorithm that time evolves the linear Vlasov equation with an exponential speed up, thereby, directly addressing the computational demands of the 6D phase space.  Progress is being made on developing strategies for the nonlinear problem.  A series expansion with good convergence properties using the Homotopy Analysis method (HAM)[1] allows formulation of the nonlinear problem as a large number of matrix multiplies suitable for an efficient quantum algorithm.  Additionally, we will discuss how plasma theory can help support QIS via many-particle simulation of ultra-cold non-neutral ion plasmas.  A Penning trap is being used to simulate 100’s of interacting quantum spins using an ultracold 2D crystal of singly-ionized Beryllium ions[2].  The simulation obtains excellent agreement with linear eigenmode analysis and includes a fairly detailed laser doppler cooling model that allows prediction of the ultracold plasma steady state, and shows agreement with experimentally observed temperatures.