[en] The invention relates to linear accelerators. It refers to a linear accelerator comprising an electronic source, an ion-injection device and an accelerating unit, the magnetic field of the latter being gradually decreasing from the inlet to the outlet, so that the ions injected and trapped in the troughs of the thus-formed progressive wave are accelerated up to a velocity nearing that of light

[en] The subject is discussed under the headings: dynamics in bending sectors; lattice with straight sections - NIMROD; numerical calculations for NIMROD. (U.K.)

[en] This is a general information article of the ICFA Beam Dynamics Newsletter No. 80. It contains two forewords from the editor-in-chief and the issue editor, a recent Ph.D. thesis section, and a section of announcements from the beam dynamics panel.

No abstract available

[en] The envelope equations for a KV beam with space charge have been analyzed systematically by an e expansion followed by integrations. The focusing profile as a function of axial length is assumed to be symmetric but otherwise arbitrary. Given the bean current, emittance, and peak focusing field, we find the envelopes a(s) and b(s) and obtain < a>, a_max, σ, and σ₀. Explicit results are presented for various truncations of the expansion. The zeroth order results correspond to those from the well-known smooth approximation; the same convenient format is retained for the higher order cases. The first order results, involving single correction terms, give 3--10 times better accuracy and are good to ∼1% at σ₀ = 70 degree. Third order gives a factor of 10--30 improvement over the smooth approximation and derived quantities accurate to ∼1% at σ₀ = 112 degree. The first order expressions are convenient design tools. They lend themselves to variable energy problems and have been applied to the design, construction, and testing of ESQ accelerators at LBL

[en] This is a general information article of the ICFA Beam Dynamics Newsletter No. 79. It contains two forewords from the Editor-in-Chief and the issue editor, a workshop and conference report section, a recent Ph.D. thesis section, a forthcoming beam dynamics events section, and a section of announcements from the beam dynamics panel.

[en] The SNS Ring off-line parallel simulation environment based on the Unified Accelerator Libraries (UAL) has en implemented and used for extensive full-scale beam dynamics studies arising in high-intensity ring. The paper describes the structure of this environment and its application to various high-intensity topics and diagnostics modeling

No abstract available

[en] The definition of the slip factor can be obtained from the phase equation. However, a derivation using the relation Δφ = -hΔθ leads to a different slip-factor definition. This apparent paradox is examined in detail and resolved. Here Δφ is the rf phase difference and Δθ is the azimuthal phase difference around the accelerator ring between an off-momentum particle and the synchronous particle, while h is the rf harmonic

No abstract available