Ms
Wakaba Kobayashi
(Keio University)
03/09/2018, 15:40
H– and D– sources for fusion, accelerators and other applications
Poster
A new linear accelerator Linac4 [1] is being commissioned at CERN as a part of the upgrade of their accelerator chain. A radio frequency (RF) driven type negative hydrogen H- source is used as an injector of Linac4. The Linac4 H- source must deliver 40-50 mA, 45 keV H- beam. The power transfer efficiency between the RF generator and the ion source plasma is one of the important parameters that...
Dr
Petr Deichuli
(Budker Institute of Nuclear Physics)
03/09/2018, 15:40
Beam lines and facilities
Poster
The significant part of any high-power neutral beam injector is the beam absorber, which serves also as a calorimeter. The power neutral beam injector operates in multimegawatt range and the peak-power densities normal to the beam axis can reach few tens kW/cm2, especially for injectors with beam focusing. With these parameters the main problem is the crisis of the heat transfer between the...
Ms
Wendou Yan
(State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology)
03/09/2018, 15:40
Other Negative ion sources
Poster
To study and optimize negative ion production for the HUST (Huazhong University of Science and Technology) radio frequency negative ion source, an instrumented calorimeter is under construction with the aim of testing beam characteristics and verifying the source proper operation. Based on the comparative analysis of different calorimeter structures and actual requirements of the HUST source,...
Dr
Valery Savkin
(Budker Institute of Nuclear Physics)
03/09/2018, 15:40
H– and D– sources for fusion, accelerators and other applications
Poster
A series of Surface-Plasma negative ion Sources (SPSs) were developed and produced at BINP in the last 30 years. The energy of H- beams, delivered by SPS is varied in the region 10 - 120keV, the beam current – in the range from several mA CW up to several Amps in the long-pulsed operation [1].
A typical Power Supply system (PS) of the ion source provides the powering and controlling of SPS...
Dr
Min Park
(Korea Atomic Energy Research Institute)
03/09/2018, 15:40
H– and D– sources for fusion, accelerators and other applications
Poster
The development of a Cs-seeded RF negative ion beam source has been started as a collaborative research project between two institutes KAERI and NFRI, towards ITER neutral beam injector (NBI) technology. The final performance objective of the source is to produce 200 keV, 0.5 A deuterium ion beams. The preliminary experiments for the performance evaluation of the RF plasma source was...
Dr
Emanuele Sartori
(Consorzio RFX - Università di Padova)
03/09/2018, 15:40
Fundamental processes and modelling
Poster
The use of caesium vapour is mandatory in plasma sources for negative ion beams to achieve a sufficient negative ion density. In the SPIDER ion source, three caesium ovens will provide a sufficiently high caesium flux to the walls of the ion source, but also a relatively even caesium distribution in the ion source volume. In order to qualify the caesium ovens in terms of repeatability of the...
Peng Chen
(State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology)
03/09/2018, 15:40
H– and D– sources for fusion, accelerators and other applications
Poster
Faraday shield (FS), a thin-wall metal structure with slits, is used in inductive coupled plasma (ICP) sources to protect the ceramic tube from the plasma erosion and eliminate capacitive coupling. Through the slit, electromagnetic energy is coupled into the driver to excite and sustain plasma, hence FS is an important component of ICP source. Material and structure, which has significant...
Dr
Masafumi Yoshida
(Yamaguchi University)
03/09/2018, 15:40
H– and D– sources for fusion, accelerators and other applications
Poster
Modeling for a longer stable production of the negative ion beams in the JT-60 negative ion source is constructed, based on the experimentally obtained temperature dependace of the cesium (Cs) adsorption/desorption. In this model, a thickness of the Cs layer on a plasma grid (PG) in this source is evaulated, because the Cs layer loweres a work function of the PG to enhance the negative ion...
Mr
Kirill Barkalov
(NRC "Kurchatov institute")
03/09/2018, 15:40
Beam lines and facilities
Poster
Diagnostic of neutral beam (NB) profiles in powerful long-pulse injectors intended for plasma heating and current drive in fusion devices is a problem task in consequence of very high NB power density (PD) at a level of tens MW/m2. NB profiles give an information required for determination of such important parameters as the beam divergence angle and accuracy of its axis aiming onto a tokamak...
Dr
Seth Veitzer
(Tech-X Corporation)
03/09/2018, 15:40
Fundamental processes and modelling
Poster
Conventional global models for plasma discharge chambers solve volume averaged continuity equations, electron and total energy equations supplemented by quasineutrality condition in order to obtain plasma components number densities and electron and heavy species temperatures. These models are limited to single chamber designs. Their main advantage is a rapid evaluation of parameter space that...
Dr
Andrey Sanin
(Budker Institute of Nuclear Physics)
03/09/2018, 15:40
Beam formation and low energy transport
Poster
An electrostatic vacuum-insulation tandem accelerator is under operation at Budker Institute of Nuclear Physics since 2006. The 2 -2.5 MeV protons with continuous accelerated current more than 5 mA are produced [1]. To increase the injected current, the new injector with pre-acceleration of negative ions was developed. The injector consists of the high current negative ion source version [2],...
Mr
Anand Mathai George
(D-Pace, University of Auckland)
03/09/2018, 15:40
H– and D– sources for fusion, accelerators and other applications
Poster
D-Pace's multi-cusp ion source achieves high DC beam currents for negative hydrogen ions in both the TRIUMF licensed filament-powered ion source (~18mA) and the University of Jyväskylä licensed RF ion source (~8mA). However, the DC beam currents achieved from this source for negative deuterium ions is only 1/3 that of negative hydrogen ions. An earlier study [1] revealed that it is possible...
Dr
Igor Shikhovtsev
(Budker Institute of Nuclear Physics)
03/09/2018, 15:40
H– and D– sources for fusion, accelerators and other applications
Poster
In the last decade, a series of high power neutral beam injectors for plasma heating and diagnostics in magnetic fusion experiments has been developed at the Budker Institute of Nuclear Physics. In the injectors, the plasma emitter is produced by inductively coupled radio frequency discharge. With this emitter of difference size, positive ion hydrogen and deuterium beams with energy up to 60...
Dr
Byungkeun Na
(National Fusion Research Institute)
03/09/2018, 15:40
H– and D– sources for fusion, accelerators and other applications
Poster
A prototype radio frequency (RF) negative hydrogen ion source is under developing under the cooperative research project between the National Fusion Research Institute (NFRI)and the Korea Atomic Energy Research Institute (KAERI). An inductively coupled plasma (ICP) of 2 MHz radio frequency is developed so far, and three grids accelerator and Cesium injector will be developed in the near...
Dr
Loic Schiesko
(Max-Planck-Institute für Plasmaphysik)
03/09/2018, 15:40
H– and D– sources for fusion, accelerators and other applications
Poster
The Neutral Beam Injection (NBI) system for ITER requires large scale sources for negative hydrogen ions. BATMAN (Bavarian Test Machine for Negative Ions) is dedicated to physical investigations due to its flexible access for diagnostics and exchange of source components.
In 2017, several critical hardware components were upgraded (see W. Kraus contribution for details) and BATMAN Upgrade...
Dr
Sergey Ananyev
(NRC "Kurchatov Institute")
03/09/2018, 15:40
Beam lines and facilities
Poster
Neutral beam injection (NBI) system of the thermonuclear neutron source DEMO-FNS is suggested for a steady-state plasma heating and current drive. The injector scheme for DEMO-FNS incorporates a negative ions source coupled with accelerator delivering D- beam accelerated to 500keV with the current 40A. The subsequent neutralization and ions removal from the beam, as well as its further path to...
Mr
Shota YAMADA
(Keio University)
03/09/2018, 15:40
H– and D– sources for fusion, accelerators and other applications
Poster
$\,\,\,\,\,\,\,\,$Multi cusp DC arc-discharge hydrogen negative ion ($\mathrm {H}^-$) source has been developed for proton cyclotron, which is used for Boron Neutron Capture Therapy (BNCT) [1, 2]. In order to shorten the treatment time for BNCT, it is required to get high extracted beam current from the source.
$\,\,\,\,\,\,\,\,$The final goal of this study is to understand the dependence...
Dr
Kenichi Nagaoka
(National Institute for Fusion Science)
03/09/2018, 15:40
H– and D– sources for fusion, accelerators and other applications
Poster
Development of high-density negative ion plasmas and control of behaviors of the negative ion plasmas and beams are performed for a variety of application of negative ion beams. Three negative ion beam injectors based on filament-arc source have been operational for plasma experiment in Large Helical Device. In order to improve the negative ion beam performance in deuterium beam operation,...
Mr
Masaki Ishikawa
(Doshisha University)
03/09/2018, 15:40
Fundamental processes and modelling
Poster
Effect of the plasma electrode position upon the negative hydrogen (H$^-$) ion beam current extracted from a Bernas type ion source have been studied. In the previous study plasma electrode located inside of the arc chamber covered almost all length along the plasma column sustained in a liner confinement magnetic field. In this study the amount of H$^-$ beam current was measured as a function...
Mr
Caichao Jiang
(Institute of Plasma Physics, Chinese Academy of Sciences)
03/09/2018, 15:40
H– and D– sources for fusion, accelerators and other applications
Poster
A negative ion source test facility was developed for the ion source performance tests. In order to support the experimental research, a power feed-in system was designed, which contains a solid state radio frequency (RF) generator and a matching network of L type with high voltage transformer. The design of RF generator was presented in this paper according to the requirements and...
Dr
Weidong Chen
(Institute of High Energy Physics, Chinese academy of sciences)
03/09/2018, 15:40
H– and D– sources for fusion, accelerators and other applications
Poster
An RF H-minus source with external antenna is under development for the upgrade of China Spallation Neutron Source (CSNS), which requires a H$^-$ beam of 40 mA peak current at 25 Hz repetition rate and 1 ms pulse length. The 2 MHz RF power is generated by a solid-state amplifier. Then a 50 kV insulation transformer is used to protect the amplifier from electric flash. The matching circuit...
Mauro Recchia
(Consorzio RFX)
03/09/2018, 15:40
H– and D– sources for fusion, accelerators and other applications
Poster
SPIDER is the prototype of the ion source of the ITER Neutral Beam Injector presently in operation at the Neutral Beam Test Facility in Padova, Italy, designed to deliver an ion current density of 355A/m2 in H- (285 A/m2 in D-) and to accelerate the beam of extracted particles up to 100 keV energy. SPIDER is equipped with a plasma source composed of 8 Radio Frequency (RF) drivers each...
Mr
Shingo Masaki
(Doshisha University)
03/09/2018, 15:40
Fundamental processes and modelling
Poster
Current fusion plasma research requires a high intensity neutral beam of either hydrogen or deuterium to heat the plasma. The intensity of the negative hydrogen (${\rm H^{-}}$) ion current extracted from an ion source chamber depends on both the plasma electrode (PE) surface material and the bias voltage against the plasma potential. The amount of the negative deuterium (${\rm D^{-}}$) ions...
Dr
Marco Cavenago
(INFN-LNL)
03/09/2018, 15:40
Fundamental processes and modelling
Poster
The complexity of the negative ion sheath is immediately evident, for several reasons:
the electrons are magnetized, so that a collisionless model is clearly faulty and overoptimistic, since it neglect electron extraction (an undesired effect). As in other sheath models, the kinetic effects are important, so that the self-consistent electric potential is naturally determined by an integral...
Dr
Antonio Pimazzoni
(Consorzio RFX)
03/09/2018, 15:40
H– and D– sources for fusion, accelerators and other applications
Poster
In order to verify the accomplishment of the ITER requirements regarding the maximum allowed beam non-uniformity (below ±10%), beamlet divergence and stripping losses during short pulse operation (several seconds), a diagnostic calorimeter, named STRIKE [1], will be exposed to the negative hydrogen ion beam of the ITER ion source prototype SPIDER [2]. The facility, located at Consorrzio RFX...
