Ion hose instability

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August undefined, 2024

WebIon-Hose Instability in Long Pulse Induction Accelerators George J. Caporaso and Jim. F. McCarrick Lawrence Livermore National Laboratory, Livermore, California 94550 USA Abstract The ion-hose (or fast-ion) instability sets limits on the allowable vacuum in a long-pulse, high current accelerator. WebAn electron beam focused by an ion channel without a magnetic field, in the so-called ion focus regime (IFR), may be disrupted by the transverse ion hose instability. We …

Ion Effects in the DARHT-II Downstream Transport

WebThis instability is a direct result of beam-electron ionization of residual background gas, and the growth rate is proportional to the ion density. In a typical accelerator vacuum, there is … WebThe ion-hose instability growth between the accelerator and the septum quad is small, even without the strong Proceedings of 2005 Particle Accelerator Conference, Knoxville, Tennessee 0-7803-8859-3/05/$20.00 c2005 IEEE 376. solenoidal magnetic field as in the accelerator, because fish hoek false bay college

The ion-hose instability (Technical Report) OSTI.GOV

Web2 aug. 2000 · The ion-hose (or fast-ion) instability sets limits on the allowable vacuum in a long-pulse, high current accelerator. Beam-induced ionization of the background … The firehose instability (or hose-pipe instability) is a dynamical instability of thin or elongated galaxies. The instability causes the galaxy to buckle or bend in a direction perpendicular to its long axis. After the instability has run its course, the galaxy is less elongated (i.e. rounder) than before. Any sufficiently thin stellar system, in which some component of the internal velocity is in the form … Webthe ion-hose@11# and the fast beam-ion instability@6#. The ion-hose instability occurs if an electron beam is injected into a plasma, where the beam ﬁeld expels the electrons. A two-stream instability can then develop between the gener-ated plasma channel and the beam. The ion-hose instability is weakened by a solenoid ﬁeld, which produces ... fish hoek fc

Ion-hose instability in a long-pulse accelerator - IEEE Conference ...

A Study of the Ion Hose Instability in the DARHT-II Downstream ...

WebThe ion hose instability, which can seriously disrupt an IREB propagating in a focusing ion channel, is studied for the charge neutral Bennett-pinched beam. A rigid beam approximation predicts that the instability occurs in the long wavelength region, has a strong resonant growth, and has features of an absolute instability. WebThe growth and saturation of the ion-hose instability in an applied axial magnetic field is examined. This dipole streaming instability is an important factor in determining the time … fish hoek flats to rentWeb1 apr. 1997 · A relativistic electron beam magnetically self-focused in a plasma is subject to an electrostatic hose instability. A linear theory of hose growth is formulated taking into account nonlinear... can asylum seekers study at university

"Web29 mei 1992 · The conditions, when as a result of ion-hose instability development may be coming out of the channel by beam tail, were founded. It was showed, that suplementary creation of plasma by electron beam and ions did not … " - Ion hose instability

Ion hose instability

Web4 apr. 2024 · 2. Source term S = − ( ρ − J z, p) (black lines) as assumed in the model and resulting focusing field (blue lines) in a plasma column (solid lines) and a homogeneous plasma (dashed lines). In a plasma column with a radius Rp smaller than the blowout radius Rb, the focusing field is reduced at the blowout radius. PPT. Web1 jun. 1993 · The hose instability, which is seeded by initial transverse beam and/or plasma phase space asymmetries, is growing rapidly due to the extreme transverse fields, which can be on the same order...

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WebThe ion-hose instability is considered to be a potential danger for long-pulse, high-current electron linear induction accelerators (LIAs). As is shown in this paper, it is also a concern for multipulse LIAs. WebThe ion-hose instability is not a threat in the downstream system. Figure 4: The number of e-folding growth for a tickler excitation of the ion-hose instability varies with the envelope variation parameter µ and the fractional ion frequency spread δ. 4 KICKER SWITCHING AND SPOT SIZE DILUTION The DARHT-II kicker uses a modulated, solid-state

WebThe ion hose instability in the ion‐focused regime is analyzed using a rigid beam model with phenomenological damping terms. Values of the instability wavelength, e‐folding … WebThe ion- hose instability is a transverse electrostatic instability which occurs as a result of the interaction between the beam and the ion channel transverse motions.

Web1 jun. 1993 · The growth rate of the ion-hose instability has been measured for a 2.5 MeV, 1 kA, 1 {mu}sec electron beam following plasma channels of O{sub 2}, N{sub 2}, and … Web22 jun. 2001 · Abstract: The ion-hose instability is a transverse electrostatic instability which occurs on electron beams in the presence of a low-density ion channel. In the …

WebIn order to support commissioning experiments in the DARHT-II induction linac at Los Alamos National Laboratory, a spreadmass code is improved so that the parameter space for the experiment can be surveyed quickly. Computer simulations of the ion-hose effect typically use Particle-In-Cell (PIC) computer codes or codes using the spread-mass …

WebA Plasma instability is a region where turbulence occurs due to changes in the characteristics of a plasma (eg. temperature, density, electric fields, magneti fields). As the name suggests, instabilities are unstable, though they may appear to evolve through different forms (morphology). can asylum seekers open a bank account in ukWebA relativistic electron beam, propagating in an underdense ion‐focusing channel that is embedded within a broad region of underdense plasma, is shown to be subject to a hose instability due to coupling with plasma electrons at the edge of the pure‐ion region. The instability is studied by means of linearized analytic calculations of dispersion relations … fish hoek high diversity trainingWeb19 aug. 1991 · The asymptotic growth of beam-centroid oscillations is computed, and the growth length is found to be very rapid, indeed much less than the betatron period of the beam. A relativistic electron beam propagating through an ummagnetized, underdense plasma exhibits a transverse instability due to the coupling of the beam centroid to … can asylum seeker study in usaWeb18 jul. 2024 · This instability is a direct result of beam-electron ionization of residual background gas, and the growth rate is proportional to the ion density. In a typical accelerator vacuum, there is little ion density decay between beam pulses, and the … fish hoek college cape townWebThe ion-hose instability sets limits on the allowable vacuum in the DARHT-2 linear induction accelerator (2kA, 18.6MeV, 2µ s). Lamda is a transport code which advances the beam centroid and envelope in a linear induction accelerator from the injector to … fish hoek football clubWebhose instability is a purely growing mode, or equivalently, is an aperiodic instability) provided the following condition for the instability is satisfied; The above instability … fish hoek food deliveryWebThe ion-hose (or fast-ion) instability sets limits on the allowable vacuum in a long-pulse, high current accelerator. Beam-induced ionization of the background gas leads … fish hoek high school address