Critical Problems in Plasma Heating/CD in large fusion devices and ITER
نویسنده
چکیده
We identify critical problems in Plasma Heating and Current Drive plasma-wave interaction physics and antennae concepts/technology for large fusion devices, including tokamaks, stellarators, mirror traps and constructing ITER for all major methods like ECRF, ICRF, NBI and LHH. Analysis is based on experiments in large machines and modelling with 3D ICRF and ECRF recently developed full wave PSTELION and STELEC codes, including mode conversion, 3D in-port antennae ANPORT and ANTRES3 codes and theoretical evaluations. We outline identified problems resolution by: 1) elaborated 3D RF full wave codes modeling, 2) proposing High Frequency Fast Waves (HFFW) numerically modelled scheme for DIII-D and ITER, 3) considering principally new approach for ICRH/CD method, especially in conditions of transient ELM activity, making use toroidally broad multi loop Travelling Wave Antenna (TWA) concept which naturally incorporates antenna’s loops inter coupling through a plasma with elegant control of antenna-plasma coupling through a small generator frequency change to properly control toroidal wave’s spectrum during plasma edge density profile reconstruction; 4) developing new ITER-like ICRF scenarios at fundamental deuterium harmonic, partially recently explored on JET [1]. 1. Ion Cyclotron Frequency range (ICRF). ICRF Travelling Wave Antenna concept for ITER and large machines There are principal problems with ICRF power coupling for multi loop individually fed resonant antennae (recently again confirmed in JET ICRF experiments [1]) due to loops inter coupling through vacuum and weakly damped Fast Wave (FW) waves into plasma, being especially severe for Current Drive (CD) mode, and design easy to understand looking on JET-EP ICRF 8 loops antenna de Each resonating loop is located in individual conducting hous Fig.1 JET “ITERlike” 0-pi antenna (operation in 2008) Loops Cross coupling through a plasma ed for ITER. This is sign shown on Fig.1. ing (thus decreasing
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