Alfvén eigenmode structure during off-axis neutral beam injection
نویسندگان
چکیده
منابع مشابه
An Off-Axis Neutrino Beam
1 Problem A typical high-energy neutrino beam is made from the decay of π mesons that have been produced in proton interactions on a target, as sketched in the figure below. Suppose that only positively charged particles are collected by the " horn ". The main source of neutrinos is then the decay π + → µ + ν µ. 1. Give a simple estimate of the relative number of other types of neutrinos than ν...
متن کاملTH/P3-1 Off-axis Neutral Beam Current Drive for Advanced Scenario Development in DIII-D
Modification of the two existing DIII-D neutral beam lines is proposed to allow vertical steering to provide off-axis neutral beam current drive (NBCD) as far off-axis as half the plasma radius. New calculations indicate very good current drive with good localization off-axis as long as the toroidal magnetic field, BT, and the plasma current, Ip, are in the same direction (for a beam steered do...
متن کاملAnomalous flattening of the fast-ion profile during Alfvén-Eigenmode activity.
Neutral-beam injection into plasmas with negative central shear produces a rich spectrum of toroidicity-induced and reversed-shear Alfvén eigenmodes in the DIII-D tokamak. The first application of fast-ion D_{alpha} (FIDA) spectroscopy to Alfvén-eigenmode physics shows that the central fast-ion profile is anomalously flat in the inner half of the discharge. Neutron and equilibrium measurements ...
متن کاملAlfvénic Instabilities and Fast Ion Transport in the DIII-D Tokamak
Neutral beam injection into reversed magnetic shear DIII-D plasmas produces a variety of Alfvénic activity including Toroidicity and Ellipticity induced Alfvén Eigenmodes (TAE/EAE, respectively) and Reversed Shear Alfvén Eigenmodes (RSAE) as well as their spatial coupling. These modes are typically studied during the discharge current ramp phase when incomplete current penetration results in a ...
متن کاملDevelopment of radial neutral beam injection system on LHD
A radial Neutral Beam Injector (NBI) is newly installed on the Large Helical Device (LHD). The aims of the NBI are its usage as a diagnostic NB for charge exchange recombination spectroscopic measurement and using the NB as a heating source for ions in plasmas. A new positive-ion source was developed for this NBI at NIFS. The structure of the cusp field of the source was determined by the numer...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nuclear Fusion
سال: 2012
ISSN: 0029-5515,1741-4326
DOI: 10.1088/0029-5515/52/10/103009