cicyt UNIZAR

Accelerator Physics

New submissions

[ total of 6 entries: 1-6 ]
[ showing up to 2000 entries per page: fewer | more ]

New submissions for Tue, 20 Mar 18

[1]  arXiv:1803.06663 [pdf, other]
Title: Direct Measurement of Focusing Fields in Active Plasma Lenses
Comments: 13 pages, 6 Figures
Subjects: Accelerator Physics (physics.acc-ph)

Active plasma lenses have the potential to enable broad-ranging applications of plasma-based accelerators owing to their compact design and radially symmetric kT/m-level focusing fields, facilitating beam-quality preservation and compact beam transport. We report on the direct measurement of magnetic field gradients in active plasma lenses and demonstrate their impact on the emittance of a charged particle beam. This is made possible by the use of a well-characterized electron beam with 1.4mmmrad normalized emittance from a conventional accelerator. Field gradients of up to 823T/m are investigated. The observed emittance evolution is supported by numerical simulations, which demonstrate the conservation of the core beam emittance in such a plasma lens setup.

[2]  arXiv:1803.06696 [pdf, other]
Title: Studies of a scheme for Low EMittance Muon Accelerator with production from positrons on target
Comments: submitted to Physical Review Accelerators and Beams
Subjects: Accelerator Physics (physics.acc-ph)

A study of a new scheme to produce very low emittance muon beams using a positron beam of about 45 GeV interacting on electrons on target is presented. One of the innovative topics to be investigated is the behaviour of the positron beam stored in a low emittance ring with a thin target, that is directly inserted in the ring chamber to produce muons. Muons can be immediately collected at the exit of the target and transported to two mu+ and mu- accumulator rings and then accelerated and injected in muon collider rings. We focus in this paper on the simulation of the e+ beam interacting with the target, the effect of the target on the 6-D phase space and the optimization of the e+ ring design to maximize the energy acceptance. We will investigate the performances of this scheme, ring plus target system, comparing different multi-turn simulations. A preliminary review of the full scheme parameters is discussed in view of the results obtained on the ring plus target system. In addition, a first acceleration scheme is presented together with a possible 14 TeV collider layout.

[3]  arXiv:1803.06900 [pdf, other]
Title: Analytical Impedance Models for Very Short Bunches
Authors: Igor Zagorodnov
Comments: 24 pages, 11 figures
Subjects: Accelerator Physics (physics.acc-ph)

We discuss several analytical models for impedances of very short bunches. The approximate analytical models are compared with direct solution of Maxwells equations.

[4]  arXiv:1803.07056 [pdf]
Title: Non-evaporable getter coating chambers for extreme high vacuum
Subjects: Accelerator Physics (physics.acc-ph)

Techniques for NEG coating a large diameter chamber are presented along with vacuum measurements in the chamber using several pumping configurations, with base pressure as low as 1.56x10^-12 Torr (N2 equivalent) with only a NEG coating and small ion pump. We then describe modifications to the NEG coating process to coat complex geometry chambers for ultra-cold atom trap experiments. Surface analysis of NEG coated samples are used to measure composition and morphology of the thin films. Finally, pressure measurements are compared for two NEG coated polarized electron source chambers: the 130 kV polarized electron source at Jefferson Lab and the upgraded 350 kV polarized 2 electron source, both of which are approaching or within the extreme high vacuum (XHV) range, defined as P<7.5x10^-13 Torr.

Replacements for Tue, 20 Mar 18

[5]  arXiv:1710.03879 (replaced) [pdf, other]
Title: Improving particle beam acceleration in plasmas
Comments: Submitted for publication
Subjects: Accelerator Physics (physics.acc-ph); Plasma Physics (physics.plasm-ph)
[6]  arXiv:1803.03447 (replaced) [pdf, other]
Title: Probability of radiation of twisted photons in the infrared domain
Comments: 26 pp., 7 figs; formulas (15)-(22) added
Subjects: Accelerator Physics (physics.acc-ph); Optics (physics.optics)
[ total of 6 entries: 1-6 ]
[ showing up to 2000 entries per page: fewer | more ]

Disable MathJax (What is MathJax?)