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Results 1 - 10
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4,400
SLAC-PUB-12523 BETA-BEAT CORRECTION USING STRONG SEXTUPOLE BUMPS IN
"... A method for correcting lattice beta mismatches has been developed for the PEP-II collider using orbit offsets in strong sextupoles. The solution is first predicted in the MAD program by modelling closed orbit bumps in the plane of correction at the sextupoles strongest in that plane. The derived so ..."
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A method for correcting lattice beta mismatches has been developed for the PEP-II collider using orbit offsets in strong sextupoles. The solution is first predicted in the MAD program by modelling closed orbit bumps in the plane of correction at the sextupoles strongest in that plane. The derived
Effectiveness of Emittance Bumps in the NLC and USColdLC Main Linear Accelerators
, 2004
"... We report on a series of studies on the effectiveness of closed orbit bumps in the linacs of the NLC and the USColdLC. In the first study, emittance dilutions of a pure-wakefield or pure-dispersion character are introduced in each linac, and a set of emittance bumps is tested to determine the most e ..."
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We report on a series of studies on the effectiveness of closed orbit bumps in the linacs of the NLC and the USColdLC. In the first study, emittance dilutions of a pure-wakefield or pure-dispersion character are introduced in each linac, and a set of emittance bumps is tested to determine the most
SIS18 closed orbit correction using a local bump method
"... A three-bump local orbit distortion method was applied to the SIS18 closed orbit (CO) correction. We report on several measurement campaigns on closed orbit measurement and correction carried out in February-May 2006. The details of closed orbit measurements and results of the correction are present ..."
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Cited by 4 (4 self)
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A three-bump local orbit distortion method was applied to the SIS18 closed orbit (CO) correction. We report on several measurement campaigns on closed orbit measurement and correction carried out in February-May 2006. The details of closed orbit measurements and results of the correction
ORBIT DISTORTIONS AND BUMPS IN THE PEP-II LER RING*
"... The PEP-II B-factory has already achieved twice the design daily-integrated luminosity. This is even more remarkable when looking at the beam orbits, especially in the low energy ring (LER). Orbit oscillations with an amplitude of 7 mm have grown over the years. Four attempts to steer them down resu ..."
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sextupoles. In order to attack the remaining orbit excursions one at a time, an orbit bump program has been extended to handle coupled regions, by closing the oscillations in the other plane. Due to the big oscillations the beam is often close to the walls generating beam loss and reducing the lifetime
Beam-Based Alignment of the NLC Main Linac, Part Two: Dispersion-Free Steering and Dispersion Bumps
"... The standard prescription for NLC main linac steering assumes that the RMS offset between a quad’s magnetic center and the corresponding BPM’s electrical center can be determined at the level of a micron. This is a fearsome requirement, and will be particularly difficult to achieve if hybrid iron/pe ..."
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, the use of closed orbit bumps to globally correct dispersive emittance growth is considered. The studies indicate that DFS can be used successfully in the NLC main linac environment, and that dispersion bumps are a useful addition to the linac steering “toolbox, ” regardless of the main algorithm selected
New Pulsed Orbit Bump Magnets For The Fermilab Booster Synchrotron”
, 2005
"... Abstract The beam from the Fermilab Linac is injected onto a bump in the closed orbit of the Booster Synchrotron where a carbon foil strips the electrons from the Linac's negative ion hydrogen beam. Although the Booster itself runs at 15 Hz, heat dissipation in the orbit bump magnets has been ..."
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Cited by 1 (1 self)
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Abstract The beam from the Fermilab Linac is injected onto a bump in the closed orbit of the Booster Synchrotron where a carbon foil strips the electrons from the Linac's negative ion hydrogen beam. Although the Booster itself runs at 15 Hz, heat dissipation in the orbit bump magnets has been
Using Local Bumps for correcting the SIS18 Closed Orbit GSI-ACCELERATORS-04
"... In the framework of the SIS18 upgrade several measurement campaigns on the closed orbit (CO) and its correction were carried out in February-May 2006. The CO correction is important for machine operation: the better the CO is corrected, the fewer beam loss occurs during operation due to increase of ..."
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In the framework of the SIS18 upgrade several measurement campaigns on the closed orbit (CO) and its correction were carried out in February-May 2006. The CO correction is important for machine operation: the better the CO is corrected, the fewer beam loss occurs during operation due to increase
(A) MAGNET ALIGNMENT TOLERANCES IN THE SLC FINAL FOCUS SYSTEM DETERMINED BY LIE
, 1994
"... Using Lie algebra techniques, static alignment tolerances are derived for all quadrupole and sextupole magnets in the 1994 SLC final focus. Three different effects are identified which limit the tolerable quadrupole misalignment. The largest amplitude of an offset-compensating closed orbit bump and ..."
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Using Lie algebra techniques, static alignment tolerances are derived for all quadrupole and sextupole magnets in the 1994 SLC final focus. Three different effects are identified which limit the tolerable quadrupole misalignment. The largest amplitude of an offset-compensating closed orbit bump
TRANSVERSE PHASE SPACE PAINTING FOR SNS ACCUMULATOR RING INJECTION*
"... The result of investigation and comparison of a series of transverse phase space painting schemes for the injection of SNS accumulator ring [1] is reported. In this computer simulation study, the focus is on the creation of closed orbit bumps that give desired distributions at the target. Space char ..."
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Cited by 1 (0 self)
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The result of investigation and comparison of a series of transverse phase space painting schemes for the injection of SNS accumulator ring [1] is reported. In this computer simulation study, the focus is on the creation of closed orbit bumps that give desired distributions at the target. Space
Development and testing of the OPLS all-atom force field on conformational energetics and properties of organic liquids
- J. Am. Chem. Soc
, 1996
"... ReceiVed June 27, 1996. ReVised Manuscript ReceiVed September 5, 1996X Abstract: The parametrization and testing of the OPLS all-atom force field for organic molecules and peptides are described. Parameters for both torsional and nonbonded energetics have been derived, while the bond stretching and ..."
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Cited by 231 (3 self)
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and angle bending parameters have been adopted mostly from the AMBER all-atom force field. The torsional parameters were determined by fitting to rotational energy profiles obtained from ab initio molecular orbital calculations at the RHF/6-31G*//RHF/6-31G * level for more than 50 organic molecules and ions
Results 1 - 10
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4,400
