dorsal/arxiv
View SchemaEnergy Stability in a High Intensity Pulsed SC Proton Linac
| Authors | Alban Mosnier |
|---|---|
| Categories | |
| ArXiv ID | physics/0008085 |
| URL | https://arxiv.org/abs/physics/0008085 |
| Journal | eConf C000821 (2000) THB10 |
Abstract
Spallation source dedicated for neutron scattering experiments, as well as multi-purpose facilities serving several applications call for pulsed mode operation of a high intensity proton linac. There is general agreement on the superconducting technology for the high-energy part, which offers some advantages, like higher gradient capabilities or operational costs reduction, as compared to room-temperatures accelerating structures. This mode of operation however could spoil the energy stability of the proton beam and needs thus to be carefully studied. First, transient beam-loading effects, arising from the large beam phase slippage along a multi-cell cavity and associated with the finite RF energy propagation, can induce significant energy modulation with a too small cell-to-cell coupling or a too large number of cells. Second, due to beam phase slippage effects along the linac, energy spread exhibits a larger sensitivity to cavity fields fluctuations than relativistic particles. A computer code, initially developed for electron beams has been extended to proton beams. It solves the 6xN coupled differential equations, needed to describe cavity fields and beam-cavity interactions of a high-energy linac composed of N cavities. Simulation examples on a typical pulsed accelerator are given with various error sources, like Lorentz forces or microphonics detuning, beam injection energy offsets, intensity jitters ...
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"abstract": "Spallation source dedicated for neutron scattering experiments, as well as\nmulti-purpose facilities serving several applications call for pulsed mode\noperation of a high intensity proton linac. There is general agreement on the\nsuperconducting technology for the high-energy part, which offers some\nadvantages, like higher gradient capabilities or operational costs reduction,\nas compared to room-temperatures accelerating structures. This mode of\noperation however could spoil the energy stability of the proton beam and needs\nthus to be carefully studied. First, transient beam-loading effects, arising\nfrom the large beam phase slippage along a multi-cell cavity and associated\nwith the finite RF energy propagation, can induce significant energy modulation\nwith a too small cell-to-cell coupling or a too large number of cells. Second,\ndue to beam phase slippage effects along the linac, energy spread exhibits a\nlarger sensitivity to cavity fields fluctuations than relativistic particles. A\ncomputer code, initially developed for electron beams has been extended to\nproton beams. It solves the 6xN coupled differential equations, needed to\ndescribe cavity fields and beam-cavity interactions of a high-energy linac\ncomposed of N cavities. Simulation examples on a typical pulsed accelerator are\ngiven with various error sources, like Lorentz forces or microphonics detuning,\nbeam injection energy offsets, intensity jitters ...",
"arxiv_id": "physics/0008085",
"authors": [
"Alban Mosnier"
],
"categories": [
"physics.acc-ph"
],
"journal_ref": "eConf C000821 (2000) THB10",
"title": "Energy Stability in a High Intensity Pulsed SC Proton Linac",
"url": "https://arxiv.org/abs/physics/0008085"
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