Full absorption of third harmonic ECH in TCV tokamak plasmas in the presence of second harmonic ECCD
S. AlbertiT. GoodmanM. HendersonA. ManiniJ.M. MoretP. GomezP. BlanchardS. CodaO. SauterY. PeyssonTcv Team
32
Citation
22
Reference
10
Related Paper
Citation Trend
Abstract:
An experimental study of the extraordinary mode (X mode) absorption at the third electron cyclotron harmonic frequency has been performed on the TCV tokamak in plasmas preheated by X mode at the second harmonic. Full single pass absorption of injected X3 power was measured with X2 preheating in co-current drive (CO-ECCD). The measured absorption exceeds that predicted by the linear ray tracing code TORAY-GA by more than a factor of 2 for the CO-ECCD case. Experimental evidence indicates that a large fraction of the X3 power is absorbed by electrons in an energetic tail created by the X2 ECCD preheating.Keywords:
Harmonic
For the production of intensive meson beams, a ring cyclotron for a 100 μA proton beam at 590 MeV is presently being constructed at the Swiss Institute for Nuclear Research (SIN) near Villigen, in the northern part of Switzerland. The pre‐acceleration of the beam to 72 MeV will be accomplished by an AVF‐cyclotron, which can also be used for acceleration of d, He and heavy ions to variable energies. The status of the development and construction of the ring cyclotron is described.
Cite
Citations (1)
Cite
Citations (1)
The RIKEN ring cyclotron (separated sector cyclotron), combined with two injectors, can accelerate all elements from proton to uranium up to energies between a few tens of MeV/u and a hundred MeV/u. Construction of this cyclotron is well under way according to schedule. All of the sector magnets were installed in the cyclotron vault in June of 1984. The remaining components are being under fabrication at the factory. Orbit analysis is also under way to find out how to operate this machine easily. The ring cyclotron will be completed in the beginning of 1986 and the first beam is scheduled for the fall. Present status of the RIKEN ring cyclotron is reported.
Cite
Citations (2)
Tokamak plasma research has been carried out for more than forty years. Small size tokamaks with major and minor radii of ˜0.3 m and ˜0.1 m were built and used in early experiments, and led the tokamak research to its present successful status involving large tokamaks such as the JT-60U and JET. The role of small tokamaks may have changed, but they still contribute to the understanding of tokamak physics and to the development of tokamak technology. Here, some experimental studies using small tokamaks are shown.
Cite
Citations (0)
A number of new reactions, some of them of a nuclearfusion type, were observed in the 63-in. N cyclotron. Angular distributions of particles produced in nuclear reactions were measured extensively with the internal beam of the 86- in. cyclotron. Trial production of a numberof radioisotopes in this cyclotron revealed that significant reductions in the cost of cyclotron-produced isotopes can be expected. New techniques are being developed which will contribute to the plans for the deflection of the beam of the 86-in. cyclotron. Preliminary design studies were made for a variable-energy cyclotron and for an 80-Mev heavy- particle cyclotron. The program for the separation of Pu isotopes has advanced to the point where it is clear that such separation is feasible. A study program involving small package-type reactors was started. (auth)
Beam energy
Cite
Citations (0)
The PISCES plasma surface interaction facility at UCLA generates plasmas with characteristics similar to those found in the edge plasmas of tokamaks. Steady state magnetized plasmas produced by this device are used to study plasma-wall interaction phenomena which are relevant to tokamak devices. We report here progress on some detailed investigations of the presheath region that extends from a wall surface into these /open quotes/simulated tokamak/close quotes/ edge plasma discharges along magnetic field lines.
Cite
Citations (1)
The construction of a superconducting cyclotron of the MSU design (K=500, Kf=160) is under way at Texas A&M. It will be used both alone and as an injector for the existing 88" (K147) cyclotron. A beam optics study has been carried out for injection of K500 cyclotron heavy-ion beams into the K147 cyclotron. This study traces a variety of beams from extraction at the K500 cyclotron until focused and dispersion matched into the proper orbit of the K147 cyclotron. The line is configured to decouple the parameters of each cyclotron by first bringing the momentum dispersion to zero and then producing a double waist which serves as the apparent source for the second cyclotron. Beam line optics for standalone operation of the K500 cyclotron, which provides for use of the present experimental facilities, have also been studied. Construction of the K500 cyclotron is proceeding approximately on schedule with operation expected in 1985.
Cyclotron resonance
Ion cyclotron resonance
Cite
Citations (2)
Tokamak plasma research has been carried out for more than forty years. Small size tokamaks with major and minor radii of ˜0.3 m and ˜0.1 m were built and used in early experiments, and led the tokamak research to its present successful status involving large tokamaks such as the JT-60U and JET. The role of small tokamaks may have changed, but they still contribute to the understanding of tokamak physics and to the development of tokamak technology. Here, some experimental studies using small tokamaks are shown.
Cite
Citations (0)
Various systems of magnetic control of plasma position, current, and shape are considered in vertically elongated tokamaks including spherical tokamaks being in operation. The systems of Resistive Wall Modes suppression are described. Tokamaks constructions and cross-sections, structural schemes of plasma control systems are given; heed is paid to operating principles of plasma control systems; experimental results of plasma control in tokamaks are given. Various engineering realizations of magnetic plasma control systems in tokamaks are presented.
Resistive touchscreen
Position (finance)
Cite
Citations (6)
An electrodynamic method for suppressing low-frequency oscillations at the fundamental cyclotron resonance in a gyrotron at a high cyclotron harmonic is proposed and theoretically investigated. According to simulations, the use of this method in the terahertz gyrotron at the second cyclotron harmonic operating at the spatially developed mode TE63,15 can provide a multiple excess of the starting currents of the parasitic modes over the starting current of the desired oscillations.
Gyrotron
Harmonic
Cyclotron resonance
Harmonic Analysis
Mode (computer interface)
Cite
Citations (43)