Results 1 - 10 of 1,723

WAKEFIELDS*

by Ralph Assmann, Alex Chao, Ralph Assmann, Alex Chao , 1997
"... To minimize emittance growth in a long linac, it is necessary to control the wakefields by correcting the beam orbit excursions. In addition, the particle energy is made to vary along the length of the bunch to introduce a damping, known as the BNS damping, to the beam break-up efiect. In this paper ..."
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To minimize emittance growth in a long linac, it is necessary to control the wakefields by correcting the beam orbit excursions. In addition, the particle energy is made to vary along the length of the bunch to introduce a damping, known as the BNS damping, to the beam break-up efiect

DISPERSION IN THE PRESENCE OF STRONG TRANSVERSE WAKEFIELDS

by Ralph W. Assmann, Alex Chao
"... To minimize emittance growth in a long linac, it is necessary to control the wakefields by correcting the beam orbit excursions. In addition, the particle energy is made to vary along the length of the bunch to introduce a damping, known as the BNS damping, to the beam break-up effect. In this paper ..."
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To minimize emittance growth in a long linac, it is necessary to control the wakefields by correcting the beam orbit excursions. In addition, the particle energy is made to vary along the length of the bunch to introduce a damping, known as the BNS damping, to the beam break-up effect

BEAM ORBIT STABILITY AT ELETTRA

by G Gaio , S Cleva , E Karantzoulis , S Krecic , M Lonza
"... Abstract The top-up operation established since 2010 at the Elettra third-generation synchrotron light source has solved the problems related to thermal drifts and beam current dependence, and a series of feedback loops acting on the machine optics and radio-frequency systems made easier to setup a ..."
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and operate the ring. Those systems together with the fast orbit feedback in operation since 2007, contributed to very high electron beam orbit stability. A description of the active systems and their performance, future perspectives as well as some still open issues will be presented and discussed.

TO THE BEAM ORBIT OF THE CEBAF ACCELERATOR

by Joseph Michael Grames, Joseph Michael Grames, Ph. D, Douglas H. Beck, Charles K. Sinclair
"... An accelerator-based experiment was performed using the CEBAF accelerator of the Thomas Jefferson National Accelerator Facility to investigate a predicted sensitivity of the beam polarization to the vertical betatron orbit in the recirculation arcs. This is the first measurement of any such effect a ..."
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An accelerator-based experiment was performed using the CEBAF accelerator of the Thomas Jefferson National Accelerator Facility to investigate a predicted sensitivity of the beam polarization to the vertical betatron orbit in the recirculation arcs. This is the first measurement of any such effect

ORBIT: BEAM DYNAMICS CALCULATIONS

by unknown authors
"... We are developing a computer code, ORBIT, specifically for beam dynamics calculations in high-intensity rings. Our approach allows detailed simulation of realistic accelerator problems. ORBIT is a particle-in-cell tracking code that transports bunches of interacting particles through a series of nod ..."
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We are developing a computer code, ORBIT, specifically for beam dynamics calculations in high-intensity rings. Our approach allows detailed simulation of realistic accelerator problems. ORBIT is a particle-in-cell tracking code that transports bunches of interacting particles through a series

PROGRESS OF TLS FAST ORBIT FEEDBACK SYSTEM AND ORBIT STABILITY STUDIES

by unknown authors
"... The orbit feedback system of the TLS has been deployed for a decade and continuously upgraded as technology develops. However, due to limitation of the existing hardware, the system cannot remove orbit excursion caused by the perturbation due to fast operation of insertion devices. To improve orbit ..."
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The orbit feedback system of the TLS has been deployed for a decade and continuously upgraded as technology develops. However, due to limitation of the existing hardware, the system cannot remove orbit excursion caused by the perturbation due to fast operation of insertion devices. To improve orbit

2002: Earth-like worlds on eccentric orbits: excursions beyond the habitable zone

by Darren M Williams , David Pollard - International Journal of Astrobiology
"... Abstract : Many of the recently discovered extrasolar giant planets move around their stars on highly eccentric orbits, and some with e 0n7. Systems with planets within or near the habitable zone (HZ) will possibly harbour life on terrestrial-type moons if the seasonal temperature extremes resultin ..."
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Abstract : Many of the recently discovered extrasolar giant planets move around their stars on highly eccentric orbits, and some with e 0n7. Systems with planets within or near the habitable zone (HZ) will possibly harbour life on terrestrial-type moons if the seasonal temperature extremes

A negative test of orbital control of geomagnetic reversals and excursions

by Dennis V Kent , Julie Carlut
"... Abstract. A ∼41 Kyr periodic component has been reported in some sedimentary paleointensity records, allowing speculation that there may be some component of orbital control of geomagnetic field generation such as by obliquity modulation. However, no discernable tendency is found for astronomically ..."
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for astronomically-dated geomagnetic reversals in the PlioPleistocene (0 to 5.3 Ma) or excursions in the Brunhes (0 to 0.78 Ma) to occur at a consistent amplitude or phase of obliquity cyclicity, nor of orbital eccentricity. An implication is that paleointensity lows which are characteristically associated

An Approach for Chaos Synchronization Based on Non-Continuous “Excursion-Orbit ” Coupling

by Shui-sheng Qiu Y, Chik. Tse, Xiaoanzhou Z, Xinguo Cai Y
"... In this paper an approach is proposed for synchronizing chaotic systems, taking the viewpoint of a special characterization of chaotic attractors in which spiraling and excursion orbits are identified as the basic constituents. The proposed synchronization method takes advantage of the fact that a c ..."
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In this paper an approach is proposed for synchronizing chaotic systems, taking the viewpoint of a special characterization of chaotic attractors in which spiraling and excursion orbits are identified as the basic constituents. The proposed synchronization method takes advantage of the fact that a

The Logarithmic Beam Position Monitor

by Evgeny A. Medvedko, Stephen R. Smith, Evgeny A. Medvedko, Stephen R. Smith , 2000
"... Abstract. Modern logarithmic amplifiers offer wide dynamic range, high bandwidth, good logarithmic conformance, and low cost making them attractive for beam position measurements. A log-ratio beam position monitor has been designed and built at SLAC for use at the PEP-II B-Factory. An integrated cir ..."
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. The log BPM’s were developed for a PEP-II ring protection chassis. Here the log BPM’s function to identify dangerous orbit excursions. These excursions are signaled to a system, which can dump the beam. Two such chassis serve to protect the PEP-II rings.
Results 1 - 10 of 1,723