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Correction of vertical Dispersion and Betatron Coupling for the CLIC Damping Ring,” this conference
"... The sensitivity of the CLIC damping ring to various kinds of alignment errors has been studied. Without any correction, fairly small vertical misalignments of the quadrupoles and, in particular, the sextupoles, introduce unacceptable distortions of the closed orbit as well as intolerable spurious v ..."
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The sensitivity of the CLIC damping ring to various kinds of alignment errors has been studied. Without any correction, fairly small vertical misalignments of the quadrupoles and, in particular, the sextupoles, introduce unacceptable distortions of the closed orbit as well as intolerable spurious vertical dispersion and coupling due to the strong focusing optics of the damping ring. A sophisticated beambased correction scheme has been developed to bring the design target emittances and the dynamic aperture back to the ideal value. The correction using dipolar correctors and several skew quadrupole correctors allows a minimization of the closedorbit distortion, the crosstalk between vertical and horizontal closed orbits, the residual vertical dispersion and the betatron coupling.
Estimates of HELHC beam parameters at different injection energies
"... Abstract A future upgrade to the LHC envisions increasing the top energy to 16.5 TeV and upgrading the injectors. There are two proposals to replace the SPS as the injector to the LHC. One calls for a superconducting ring in the SPS tunnel while the other calls for an injector (LER) in the LHC tunn ..."
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Abstract A future upgrade to the LHC envisions increasing the top energy to 16.5 TeV and upgrading the injectors. There are two proposals to replace the SPS as the injector to the LHC. One calls for a superconducting ring in the SPS tunnel while the other calls for an injector (LER) in the LHC tunnel. In both scenarios, the injection energy to the LHC will increase. In this note we look at some of the consequences of increased injection energy to the beam dynamics in the LHC.
MEASUREMENT OF BEAM SIZE IN INTRABEAM SCATTERING DOMINATED BEAMS AT VARIOUS ENERGIES AT CESRTA *
"... Abstract Recent reports from CesrTA have shown measurement and calculation of beam size versus current in CesrTA beams at 2.1 GeV. Here, the effect of changing the energy of Intrabeam Scatteringdominated beams is reported. IBS growth rates have roughly a γ −3 dependence. Measurements at 1.8, 2.1, ..."
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Abstract Recent reports from CesrTA have shown measurement and calculation of beam size versus current in CesrTA beams at 2.1 GeV. Here, the effect of changing the energy of Intrabeam Scatteringdominated beams is reported. IBS growth rates have roughly a γ −3 dependence. Measurements at 1.8, 2.1, 2.3, and 2.5 GeV are shown and compared with predictions from IBS theory.
Lattice Design for an ILC Damping Ring with 3 km Circumference
"... Abstract We describe a simple lattice that meets the specifications for the damping times and horizontal and longitudinal emittances for the International Linear Collider (ILC) damping rings. The circumference of a little over 3 km leads to a bunch spacing of around 3 ns, which will require advance ..."
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Abstract We describe a simple lattice that meets the specifications for the damping times and horizontal and longitudinal emittances for the International Linear Collider (ILC) damping rings. The circumference of a little over 3 km leads to a bunch spacing of around 3 ns, which will require advances in kicker technology for injection and extraction. We present the lattice design, and initial results of studies of the acceptance and collective effects. With the high bunch charge and close spacing, the ion and electron cloud effects are expected to be severe; however, the simple structure of the lattice allows for easy variation of the circumference and bunch spacing, which may make it useful for future investigations.
PEPX: AN ULTIMATE STORAGE RING BASED ON FOURTHORDER GEOMETRIC ACHROMATS
"... We have designed an “ultimate” storage ring for the PEPX light source that achieves the diffraction limited emittances (at 1.5 ˚A) of 12 pmrad in both horizontal and vertical planes with a 4.5GeV beam. These emittances include the contribution of intrabeam scattering at a nominal current of 200 m ..."
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We have designed an “ultimate” storage ring for the PEPX light source that achieves the diffraction limited emittances (at 1.5 ˚A) of 12 pmrad in both horizontal and vertical planes with a 4.5GeV beam. These emittances include the contribution of intrabeam scattering at a nominal current of 200 mA in 3300 bunches. This quality beam in conjunction with a conventional 4m undulator in a straight section can generate synchrotron radiation having a spectral brightness above 10 22 [photons/s/mm 2 /mrad 2 /0.1% BW] at a 10 keV photon energy. The high coherence at the diffraction limit makes PEPX competitive with 4th generation light sources based on an energy recovery linac. In addition, the beam lifetime is several hours and the dynamic aperture is large enough to allow offaxis injection. The alignment and stability tolerances, though challenging, are achievable. A ring with all