Conveners
O2
- Ursel Fantz (Max-Planck-Institut fuer Plasmaphysik)
- Gianluigi Serianni (Consorzio RFX)
Low pressure, low-temperature plasma (LTP) with a spatially varying transverse magnetic filter field configuration has a wide range of applications. In such devices, the magnetic field value is low enough that it magnetizes only the electrons and not the ions and works as an electron cooler by limiting the flux of hot electrons [1]. Due to the gradient of the transverse magnetic filter field,...
A Solid State High Frequency (HF) 1MHz, 40kW source is intended for plasma formation in neutral beam source by inductive coupling of RF power. An important design feature of such a HF source is its ability to sustain large transient swings of load(due to impedance transition in microseconds time scale). A 40kW High Frequency Power Supply( HFPS) has been configured with multiple Class-D...
The AGS-RHIC injector complex includes: high-intensity (magnetron type) H- ion source and Optically Pumped Polarized Ion Source (OPPIS); 750 keV RFQ and 200 MeV Linac. In this paper we will focus on the recent Linac LEBT upgrade with three sources: two magnetron sources and OPPIS. This LEBT configuration can be a good prototype of very reliable H- ion beam injectors for the accelerator...
BTR code is used for NBI beamlines design and studies since 2005. Initially tailored for beam re-ionized particles tracking in NBI Ducts, BTR finally became a universal tool for 3D geometry optimization and thermal loads evaluation in NB lines. BTR simulation includes all variety of neutral beam formation and transport conditions - after the ion beam extraction from the Negative or Positive...
This work addresses the negative ionization of hydrogen particles on metal surfaces with low work function, which is an important for the field of the surface plasma negative ion sources. The theoretical model for the calculation of the negative ionization probability which takes into account the component of atom/ion velocity, parallel to the surface is described. The influence of parallel...
A charge-exchange target for neutralizing a negative ion beam with energies up to 10 MeV and higher requires the development of a highly efficient plasma trap which allows to form and confine plasma with a linear density up to 1017 cm-2 and higher.
The magnetic systems in which the condition of magnetohydrodynamic stability of the plasma is satisfied are most interesting to obtain a...
For current and future large scale tokamaks, neutral beams for heating and current drive are generated from the neutralisation of large negative ion beams with powers up to 40 MW and energies up to 1 MeV. These beams are created by electrostatically extracting negative ions from a low temperature/pressure hydrogen or deuterium plasma, and accelerating them through a series of grids, resulting...
The ELISE test facility with its half ITER-size ion source is an essential part of the European Roadmap towards the ITER NBI system. One aim of ELISE is to demonstrate the ITER target values for the extracted current density, the ratio of co-extracted electrons to extracted ions and the uniformity of the extracted beam during long pulses, i.e. $1000\,\mathrm{s}$ in hydrogen and...
To reach fusion conditions and control the plasma configuration in ITER, the next step in tokamak fusion research, two neutral beam injectors (NBIs) will supply 17MW each, by neutralizing accelerated negative hydrogen or deuterium ions. The requirements of ITER NBIs (40A/1MeV D- ions for ≤1h, 46A/870keV H- ions for ≤1000s) have never been simultaneously attained. So in the Neutral Beam Test...
The Penning ion source serving the ISIS Pulsed SpallationNeutron and Muon facility routinely delivers55 mAbeamof negative hydrogen ions (H−) in250μspulses at50 Hzrep-etition rate. The Front End Test Stand (FETS) specificationsrequire60 mA,2 ms, pulses at50 Hz. Extending the ionsource discharge pulse length to2.2 mswill need overcomethe observed beam current droop caused by thermal tran-sients...
It has been recently proposed that the production of negative ions with cesium sputter ion sources could be enhanced by laser-assisted resonant ion pair production [1]. We have tested this hypothesis by measuring the effect of pulsed diode lasers at various wavelengths on the O$^-$ beam current produced from Al$_2$O$_3$ cathode of a cesium sputter ion source [2]. Here we summarize the...
