scholarly journals An investigation of the components of the neutral beam produced by high energy protons at NAL using the 30 inch bubble chamber

1971 ◽  
Author(s):  
a. Benvenutti ◽  
U. Camerini ◽  
W. F. Fry ◽  
R. March ◽  
D. D. Reeder ◽  
...  
Keyword(s):  
Bubble Chamber ◽  
High Energy ◽  
Neutral Beam

Influence of Ultrasound on the Formation of High-energy Particle Tracks in a Liquid-hydrogen Bubble Chamber

1969 ◽  
Vol 99 (9) ◽  
pp. 149-151
Author(s):  
V.A. Akulichev ◽  
L.R. Gavrilov ◽  
V.G. Grebinnik ◽  
V.A. Zhukov ◽  
G. Libman ◽  
...  
Keyword(s):  
Bubble Chamber ◽  
High Energy ◽  
Liquid Hydrogen ◽  
High Energy Particle ◽  
Hydrogen Bubble ◽  
Hydrogen Bubble Chamber ◽  
Energy Particle ◽  
Particle Tracks

scholarly journals AN ADVANCED, HIGH ENERGY NEUTRAL BEAM INJECTOR

1981 ◽  
pp. 919-925
Author(s):  
J. Alessi ◽  
A. Maschke ◽  
K. Prelec ◽  
Th. Sluyters ◽  
J. Fink
Keyword(s):  
High Energy ◽  
Neutral Beam ◽  
Neutral Beam Injector

scholarly journals Surface Modification of Dielectric Substrates by Broad Beams of High-Energy Atoms of Inert Gases

Technologies ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 43
Author(s):  
Alexander Metel ◽  
Sergey Grigoriev ◽  
Marina Volosova ◽  
Yury Melnik ◽  
Enver Mustafaev
Keyword(s):  
Glow Discharge ◽  
High Energy ◽  
Inert Gases ◽  
New Method ◽  
Neutral Beam ◽  
Glow Discharge Plasma ◽  
Parallel Plates ◽  
Shift Measurement ◽  
Dielectric Substrates ◽  
Angle Scattering

We present a new method to generate a neutral beam for surface treatment of materials by fast atoms of inert gases. The new method allows for treatment at lower pressures enlarging the scope for glow discharge applications. To generate the monoenergetic neutral beam, a grid composed of parallel plates is placed inside a vacuum chamber, a glow discharge plasma was generated, and a beam was formed by pulsing the grid to 30 kV to extract ions from the glow discharge. The ions were then neutralized by small-angle scattering at the surfaces of the grid. By applying the high voltage for 50 µs with a repetition frequency of 50 Hz, heating of the target could be limited to 100 °C (instead of 700 °C when running continuously). We present results showing the uniformity of the created beam and its energy distribution using Doppler-shift measurement. Finally, we show friction measurement of treated alumina pieces as a working example of an application of this technology.

scholarly journals Energy composition of high-energy neutral beams on the COMPASS tokamak

Nukleonika ◽  
2016 ◽  
Vol 61 (4) ◽  
pp. 419-423
Author(s):  
Klara Mitosinkova ◽  
Jan Stöckel ◽  
Jozef Varju ◽  
Vladimir Weinzettl
Keyword(s):  
Plasma Heating ◽  
High Energy ◽  
Ion Source ◽  
Neutral Beam ◽  
Beam Power ◽  
Neutral Beams ◽  
Before And After ◽  
Copper Shield ◽  
Single Aperture ◽  
Energy Components

Abstract The COMPASS tokamak is equipped with two identical neutral beam injectors (NBI) for additional plasma heating. They provide a beam of deuterium atoms with a power of up to ~(2 × 300) kW. We show that the neutral beam is not monoenergetic but contains several energy components. An accurate knowledge of the neutral beam power in each individual energy component is essential for a detailed description of the beam- -plasma interaction and better understanding of the NBI heating processes in the COMPASS tokamak. This paper describes the determination of individual energy components in the neutral beam from intensities of the Doppler-shifted Dα lines, which are measured by a high-resolution spectrometer viewing the neutral beam-line at the exit of NBI. Furthermore, the divergence of beamlets escaping single aperture of the last accelerating grid is deduced from the width of the Doppler-shifted lines. Recently, one of the NBI systems was modified by the removal of the Faraday copper shield from the ion source. The comparison of the beam composition and the beamlet divergence before and after this modification is also presented.

Recent experiments with counters at the C.E.R.N. proton synchrotron

1964 ◽  
Vol 278 (1374) ◽  
pp. 340-350
Keyword(s):  
Elementary Particle ◽  
High Energy Physics ◽  
Bubble Chamber ◽  
Regge Pole ◽  
High Energy ◽  
Point Of View ◽  
Proton Synchrotron ◽  
Peripheral Collisions ◽  
Break Up ◽  
Compound Particle

I feel I should begin by pointing out that in at least two respects I am not qualified to give this talk. The first is that our machine at Liverpool is of course a 400 MeV machine, which only counts as a low-energy one these days, and I have not worked at C. E. R. N. where the real high-energy physics in Europe is now being done; I can only speak about it at second hand. I have, however, been making rather frequent visits to C. E. R. N. recently, thanks to an invitation from Professor Weisskopf, so that I can give some description of the counter experiments on the proton synchrotron there. The description is necessarily from a spectator’s point of view, and to that extent, superficial. The second lack of qualification comes from the fact that Professor Weisskopf has explained all the easy part about the significance of the most interesting counter experiments, so that I have to try and go a little further. Now, that necessarily involves me in the extremely sophisticated and conjectural ideas of the Regge pole analysis, which are not easy to explain to non-specialists. I shall try to convey the spirit if not the substance of that analysis. However, I should like to begin with a description of a different experiment, bearing on the elementary particle spectroscopy to which Professor Weisskopf drew your attention this morning. The main details of elementary-particle spectroscopy have of course come to use from bubble-chamber experiments, and, on the whole, the counter programme has not made a great contribution to it. One experiment, however, that is unusually clear is the counter experiment of Caldwell et al . on the production of associated bosons from peripheral collisions. Figure 37 shows the sort of process that is sought in this experiment. A highenergy pion beam is directed at a nucleon and glancing collisions are sought; in other words, collisions that take place at a long range and are probably associated with the exchange of one particle. Of course, the range of the interaction is longer when the mass of the exchange particles is small, so a single pion is most likely to be exchanged. The nucleon emits this pion and may itself break up into a number of particles, which the experiment does not investigate any further. At the other vertex the exchange particle joins the pion and, hopefully, makes a compound particle which later breaks up into associated bosons, either two pions or two kaons. If the particle exchanged is a pion, of course, this short-lived compound particle has strangeness zero, and therefore it can only break up into two pions or two kaons, but not into a kaon and a pion.

Influence of Ultrasound on the Formation of High-energy Particle Tracks in a Liquid-hydrogen Bubble Chamber

1970 ◽  
Vol 12 (5) ◽  
pp. 693-695
Author(s):  
V A Akulichev ◽  
L R Gabrilov ◽  
V G Grebinnik ◽  
V A Zhukov ◽  
G Libman ◽  
...  
Keyword(s):  
Bubble Chamber ◽  
High Energy ◽  
Liquid Hydrogen ◽  
High Energy Particle ◽  
Hydrogen Bubble ◽  
Hydrogen Bubble Chamber ◽  
Energy Particle ◽  
Particle Tracks

Problems associated with the injection of a high-energy neutral beam into a plasma

1973 ◽  
Vol 13 (2) ◽  
pp. 215-220 ◽  
Author(s):  
J.G. Cordey ◽  
M.J. Houghton
Keyword(s):  
High Energy ◽  
Neutral Beam

Recent experiments with nuclear emulsions

1964 ◽  
Vol 278 (1374) ◽  
pp. 350-369 ◽  
Keyword(s):  
Spatial Resolution ◽  
Nuclear Emulsion ◽  
High Energy Physics ◽  
High Spatial Resolution ◽  
Bubble Chamber ◽  
High Energy ◽  
Emulsion Technique ◽  
Decay Modes ◽  
Automatic Methods ◽  
The Many

It is unnecessary to stress the many significant contributions made during the past 20 years to nuclear and high-energy physics by means of the nuclear emulsion technique. One needs only to recall the new particles and decay modes that have been first observed with it. With the development of other powerful techniques, however, such as the spark-chamber and bubble-chamber, readily adaptable to automatic methods of analysis and data handling, nuclear emulsion has inevitably tended to fall into the position of a supplementary method. Nevertheless, there are still important experiments for which it is the most convenient, indeed in some cases the only, technique available, and this paper will discuss such experiments, either recently carried out or proposed for the future, using beams of particles from high-energy accelerators. Nuclear emulsion possesses one most significant advantage over all other tech­niques, namely, the extraordinarily high spatial resolution of which it is capable. Other techniques can resolve events separated by tenths of millimetres. Nuclear emulsion can resolve events separated by tenths of micrometres. This high spatial resolution has made possible the measurement of the lifetime of the π 0 -meson (ca.10 -16 s) and is the basis of our confidence that there are no other commonly occurring unstable particles with lifetimes in the range 10 -11 to 10 -16 s. Most of the experiments described in this paper are particularly suited to the nuclear emulsion technique because they make use of this characteristic feature.

Experiments on proton-proton interactions at the Institute of High-Energy Physics, Serpukhov, U. S. S. R

1973 ◽  
Vol 335 (1603) ◽  
pp. 421-430
Keyword(s):  
Elastic Scattering ◽  
Cross Sections ◽  
High Energy Physics ◽  
Bubble Chamber ◽  
High Energy ◽  
Hydrogen Bubble ◽  
Hydrogen Bubble Chamber ◽  
Proton Proton ◽  
Total Cross Sections ◽  
Energy Physics

A summary of the work carried out at the Institute for High-Energy Physics, Serpukhov, U. S. S. R., on proton-proton interactions at energies between 10 and 70 GeV is given. The experiments comprise studies of small angle elastic scattering, of total cross-sections and of interactions in a hydrogen bubble chamber.

Sign in / Sign up

Export Citation Format

Share Document