168 research outputs found
Tevatron accelerator physics and operation highlights
The performance of the Tevatron collider demonstrated continuous growth over
the course of Run II, with the peak luminosity reaching 4\times1032 cm-2 s-1,
and the weekly integration rate exceeding 70 pb-1. This report presents a
review of the most important advances that contributed to this performance
improvement, including beam dynamics modeling, precision optics measurements
and stability control, implementation of collimation during low-beta squeeze.
Algorithms employed for optimization of the luminosity integration are
presented and the lessons learned from high-luminosity operation are discussed.
Studies of novel accelerator physics concepts at the Tevatron are described,
such as the collimation techniques using crystal collimator and hollow electron
beam, and compensation of beam-beam effects.Comment: 4 pp. Particle Accelerator, 24th Conference (PAC'11) 28 Mar - 1 Apr
2011: New York, US
Electron Lens as Beam-Beam Wire Compensator in HL-LHC
Current wires are considered for compensation of long-range beam-beam
interactions for the High Luminosity upgrade (HL-LHC) of the Large Hadron
Collider at CERN. In this note, we demonstrate the advantage of using Electron
Lens for this purpose instead of a conventional current-bearing wire
Detection of coherent beam-beam modes with digitized beam position monitor signals
A system for bunch-by-bunch detection of transverse proton and antiproton
coherent oscillations in the Fermilab Tevatron collider is described. It is
based on the signal from a single beam-position monitor located in a region of
the ring with large amplitude functions. The signal is digitized over a large
number of turns and Fourier-analyzed offline with a dedicated algorithm. To
enhance the signal, band-limited noise is applied to the beam for about 1 s.
This excitation does not adversely affect the circulating beams even at high
luminosities. The device has a response time of a few seconds, a frequency
resolution of in fractional tune, and it is sensitive to
oscillation amplitudes of 60 nm. It complements Schottky detectors as a
diagnostic tool for tunes, tune spreads, and beam-beam effects. Measurements of
coherent mode spectra are presented and compared with models of beam-beam
oscillations.Comment: 7 pages, 4 figures. Submitted to the Proceedings of the ICFA
Mini-Workshop on Beam-beam Effects in Hadron Colliders (BB2013), Geneva,
Switzerland, 18-22 March 201
Stability of non-linear integrable accelerator
The stability of non-linear Integrable Optics Test Accelerator (IOTA) model
was tested. The area of the stable region in transverse coordinates and the
maximum attainable tune spread were found as a function of non-linear lens
strength. Particle loss as a function of turn number was analyzed to determine
whether a dynamic aperture limitation present in the system. The system was
also tested with sextupoles included in the machine for chromaticity
compensation. A method of evaluation of the beam size in the linear part of the
accelerator was proposed.Comment: 10 p
Simulation of Beam-Beam Effects and Tevatron Experience
Effects of electromagnetic interactions of colliding bunches in the Tevatron
had a variety of manifestations in beam dynamics presenting vast opportunities
for development of simulation models and tools. In this paper the computer code
for simulation of weak-strong beam-beam effects in hadron colliders is
described. We report the collider operational experience relevant to beam-beam
interactions, explain major effects limiting the collider performance and
compare results of observations and measurements with simulations.Comment: 23 pages, 17 figure
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