Mr
Ivan Emelev
(Budker Institute of Nuclear Physics)
04/09/2018, 15:30
Beam acceleration and neutralization
Poster
The results of the experimental study of confinement of low-temperature plasma target for neutralization of high-energy negative ion beam are presented in the paper.
The plasma target cylindrical vacuum chamber is 1.2 m long and 0.2 m in diameter. The axisymmetric multicusp magnetic field is formed at the periphery of the target chamber by using an array of the permanent NdFeB magnets,...
Mr
Stephane Melanson
(D-Pace Inc)
04/09/2018, 15:30
Other Negative ion sources
Poster
Ion implantation requires a high beam current stability to ensure a uniform implantation dose across the wafers. This requires ion sources with a stable extraction system to achieve a high beam current stability. Our goal is to extract 0.5 mA of C2─ with less than 10 glitches per hour, with a glitch defined as any variation greater than +/- 5% of the nominal beam current. The beam energy...
Dr
Haruhisa Nakano
(National Institute for Fusion Science)
04/09/2018, 15:30
H– and D– sources for fusion, accelerators and other applications
Poster
In hydrogen negative ion sources, co-extracted electrons are dumped on extraction grid (EG) with electron deflection magnets (EDMs). The negative ion beam trajectory is slightly perturbed by the EDM field, and the aperture displacement technique has been applied in negative ion sources for fusion in order to compensate the beam deflection [1]. Recently, it was proposed that the beam deflection...
Prof.
Vadim Dudnikov
(Muons, Inc)
04/09/2018, 15:30
Fundamental processes and modelling
Poster
It is assumed that persistent cesiation in the SNS RF SPS is related to deposition of carbon film on the collar converter. The work function dependence for graphite with alkali deposition has no minimum typical for metals and semiconductors and the final work function is higher. For this reason, the probability of H- secondary emission from cesiated metal and semiconductors can be higher than...
Dr
Sergey Ananyev
(NRC "Kurchatov Institute")
04/09/2018, 15:30
Beam lines and facilities
Poster
Steady-state operation of a fusion neutron source (FNS) requires plasma heating and current drive by means of additional power delivered by neutral beams. Six neutral beam injectors (NBI) will provide DEMO-FNS machine with additional heating power up to 30 MW, with neutral particle energy 500 keV. NBI systems developed for ITER can serve as the prototype for DEMO-FNS, as both systems have...
Mr
Magomedrizy Atlukhanov
(Budker Institute of Nuclear Physics)
04/09/2018, 15:30
Beam acceleration and neutralization
Poster
In non resonant photon trap concept for neutralization of powerful negative ion beams one of problems is the bombarding of mirrors by high energy particles. They are occured due to scattering ions or atoms on residual gas in transport channel. The simple estimation shows that it may be the main cause of mirror damage.
The simulation data of particles scattering by background gas and their...
Mr
Masumi Kobayashi
(Doshisha University)
04/09/2018, 15:30
H– and D– sources for fusion, accelerators and other applications
Poster
Alkali metal such as cesium covers the plasma electrode to enhance the negative hydrogen ion surface production in a negative ion source. Accumulation of Cs in the source shortens the maintenance cycle of the apparatus. In this research, inorganic material, C12A7 electride, which has low work function and high electric conductance, is studied as a candidate material for a new type of...
Mr
Chen Zuo
(Huazhong University of Science and Technology)
04/09/2018, 15:30
H– and D– sources for fusion, accelerators and other applications
Poster
The radio frequency driven source for negative hydrogen ions, to investigate the physics of production and extraction of the H$^-$ ions, is under construction at Huazhong University of Science and Technology. Plasma generated from RF driver expands to the surface of plasma grid. Extraction system with three grids is designed to extract and accelerate the H$^-$ beams. The design parameters of...
Prof.
Chundong Hu
(Institute of Plasma Physics, Chinese Academy of Sciences)
04/09/2018, 15:30
Beam lines and facilities
Poster
Neutral beam injector (NBI) is an effective plasma heating and driving method for fusion sciences research. The China Fusion Engineering Test Reactor (CFETR) is under design and will be developed in the near future. In order to support the development of CFETR, a negative ion based neutral beam injector was under design. The ion source is the most precision and important part of NBI. A...
Mr
Roman Lapin
(Institute of Applied Physics of Russian Academy of Sciences)
04/09/2018, 15:30
H– and D– sources for fusion, accelerators and other applications
Poster
H^- ion sources are needed in various areas of nowadays physics, such as for beam injection into cyclotrons and storage rings and for plasma heating in experimental facilities studying the possibility of thermonuclear fusion. According to the recently proven fact that gasdynamic ECR ion source based on ECR discharge in a simple mirror trap could be very efficient for proton beam production, we...
Mr
Vladislav Kazakov
(Novosibirsk State University, Russia)
04/09/2018, 15:30
Fundamental processes and modelling
Poster
The purpose of the work is to expand the electronic database "Electronic structure of atoms" [1] through the information on the negative ions of various chemical elements. As far as the authors are aware, at present there is no specialized database on negative ions in the scientific literature and Internet.
The collection and analysis of information on atomic systems can be documented in a...
Mr
Viktor Klenov
(Institute for Nuclear Research of the Russian Academy of Sciences)
04/09/2018, 15:30
Beam lines and facilities
Poster
The "pepper-pot" emittance measuring device developed earlier for INR RAS 400 keV H-minus LEBT channel was applied with minor modification to control the transverse emittances at the exit of H-minus ion source for 7…15 keV beam energy. It includes the "pepper-pot" mask, the quartz screen, the CCD camera, PC, the software for camera data processing and beam phase portrait formation. The...
Dr
Emanuele Sartori
(Consorzio RFX - Università di Padova)
04/09/2018, 15:30
H– and D– sources for fusion, accelerators and other applications
Poster
In order to reduce the beam losses of the negative ion beam in the NIO1 experiment, the vacuum system was improved by installing an additional cryogenic pump. In the upgraded configuration, the negative ion beam can be operated in two regimes of high and low background pressures. The gas flow in the improved configuration was simulated, characterizing the existing pumping system and verifying...
24.
Injection of Atomic Hydrogen from a Thermal Cracker Cell to Plasma Grid Surface of H- Ion Source
Mr
Yuji Shimabukuro
(Doshisha University)
04/09/2018, 15:30
H– and D– sources for fusion, accelerators and other applications
Poster
The principle mechanism of the negative hydrogen (H$^-$) ion current enhancement due to Cs injection can be attributable to the reflection of atomic hydrogen at low work function plasma grid surface. To directly confirm the contribution of atomic hydrogen (H$^0$) flux in the actual ion source operating condition, H$^0$ sources of different types are attached to a small multicusp type H$^-$...
Dr
Emanuele Sartori
(Consorzio RFX - Università degli Studi di Padova)
04/09/2018, 15:30
Beam acceleration and neutralization
Poster
Negative ion beams are used as precursors of neutral beams for additional heating of fusion plasmas. By ionizing the background gas, positive ions are confined and cumulated in the negative potential well of the ion beam, until the space charge is neutralized and the negative ion beam can propagate in the absence of defocusing electric fields. Experimental measurements of the negative ion beam...
Mr
Yuito Ikeda
(Doshisha University)
04/09/2018, 15:30
Other Negative ion sources
Poster
Plasmas to prepare functional carbon films contain negative carbon ions which should modify the sheath structure on the formed films. The density distributions of carbon negative ions in the sheath region around the carbon film must critically determine the property of the film. A DC photodetachment method was utilized to measure negative carbon ion density in the plasma formed by discharge...
Mr
Timofey Bykov
(Budker Institute of Nuclear Physics)
04/09/2018, 15:30
Beam formation and low energy transport
Poster
A source of epithermal neutrons based on vacuum-insulated tandem accelerator and a lithium target was proposed and developed for the technique of boron neutron capture therapy. A stationary proton beam of 2 MeV with a current of up to 6 mA was obtained in the accelerator. To optimize the injection of a beam of negative hydrogen ions into the accelerator, a wire scanner OWS-30 (D-Pace, Canada)...
Mr
Iaroslav Kolesnikov
(Budker Institute of Nuclear Physics)
04/09/2018, 15:30
Beam formation and low energy transport
Poster
For the development of boron neutron capture therapy at the Budker Institute of Nuclear Physics it
was created a source of epithermal neutrons [1], based on a tandem accelerator with vacuum
insulation. In the accelerator it was obtained a stationary proton beam with 2 MeV energy and up to
5 mA current [2]. In order to increase the proton current, it has been in depth studied the...
Dr
Tommaso Patton
(Consorzio RFX)
04/09/2018, 15:30
Beam lines and facilities
Poster
The high-Q operation of the ITER tokamak will require two Neutral Beam Injectors (NBIs) for plasma heating and current drive. Each beam will be generated by a 40A current of Deuterium negative ions, accelerated up to the specific energy of 1MeV and then neutralized. The power delivered to the plasma by each NBI shall reach 16 MW with a duration up to 1h. The beam source will be constituted...
Prof.
Vadim Dudnikov
(Muons, Inc)
04/09/2018, 15:30
H– and D– sources for fusion, accelerators and other applications
Poster
It is proposed one universal H-/D- ion source design combining the most advanced developments in the field of polarized ion sources to provide high-current high-brightness ion beams with >90% polarization and improved lifetime, reliability, and power efficiency. The new source utilizes high-intensity resonant charge-exchange ionization of neutral atoms by negative ions generated by cesiated...
Dr
Vincenzo Variale
(INFN-Bari)
04/09/2018, 15:30
Beam acceleration and neutralization
Poster
In the ITER fusion project two deuterium Neutral Beam (NB) injectors of 40 MW will be used to further heating the TOKAMAK plasma up to the ignition temperature. The neutralization method of the two D- beams, the gas cells, has an efficiency of about 60%, then residual charged beams of about 40% have to be deflected and dumped before the injection in the plasma. In order to improve the...
Mr
Eugene Konstantinov
(Budker Institute of Nuclear Physics)
04/09/2018, 15:30
Other Negative ion sources
Poster
Accelerator mass spectrometry is a powerful analytic method used in archaeology, geology, biology and medicine. Due to its huge resolution, even single atoms are statistically observable for standard 1 or 3 mg target samples. The main problem of the method is to clear the ions beam off the molecular isobars. The use of the negative ions and stripper to change the charge state of ions solves...
Dr
Carlo Baltador
(LNL - INFN)
04/09/2018, 15:30
H– and D– sources for fusion, accelerators and other applications
Poster
The RF compact negative ion source NIO1 installed at Consorzio RFX, in collaboration with INFN-LNL, allows to test several magnetic filter configuration inside the ion source and their relation with the fringe field of the electrons suppression magnets embedded into the extraction grid (by convention z is the extraction axis, while extraction grid magnets deflects electrons along y direction)....
Prof.
Vadim Dudnikov
(Muons, Inc)
04/09/2018, 15:30
Other Negative ion sources
Poster
A new, efficient method to produce ultracold negative muon ions is proposed. The muonium atom is made up of an anti muon and an electron and is given the chemical symbol Mu. A second electron with binding energy or electron affinity of 0.75 eV makes the Mu- ion, which is in many ways almost identical to the H- ion that is used for charge-exchange injection into most proton particle...
