Last year a second-generation SSRL-type thermionic cathode rf gun was installed in the Advanced Photon Source (APS) linac. This gun (referred to as "gun2") has been successfully commissioned and now serves as the main injector for the APS linac, essentially replacing the Koontz-type DC gun. To help ensure injector availability, particularly with the advent of top-up mode operation at the APS, a second thermionic-cathode rf gun will be installed in the APS linac to act as a hot-spare beam source.The hot-spare installation includes several unique design featur% including a &eP-orbit Panofskystyle alpha magnet. Details of the hot-spare beamline design and projected performance are presented, along with some plans for future performance upgrades.
'9700 South Cass Avenue, Argonne, Illinois 60439 USAThe high voltage operation requires special attentl nd @gj+ --.to insulation for reliability and safety. Also the age short pulse operation requires good elec shielding for noise suppression. For this purpose, but not shown in the figure, an aluminum shroud will also be installed around the chopper assembly. A water-cooled copper beam dump with a vertical slot for beam passage is placed in the downstream 2.75" Conflat flange. The design specifications of the chopper system components are shown in Table I.
AbstracrThe low-energy undulator test line ILEUTL) is being built and will be tested with a short beam pulse from an rf gun in the Advanced Photon Source (APS) at the Argonne National Laboratory. In the LEUTL a beam chopper is used after the rf gun to deflect the unwanted beam to a beam dump. The beam chopper consists of a permanent magnet and an electric deflector that can compensate for the magnetic deflection. A 30-kV pulsed power supply is used for the electric deflector. The chopper subsystem was assembled and tested for beamline installation. The electncal and beam properties of the chopper assembly are presented.
The main linacs of the next generation of linear colliders need to accelerate the particle beams to energies of up to 750 GeV while maintaining very small emittances. This paper describes the main mechanisms of static emittance growth in the main linacs of the Next Linear Collider (NLC). Wc present detailed simulations of the trajectory and emittance control algorithms that are foreseen for the NLC. We show that the emittance growth in the main linacs can be corrected down to about 110%. That number is significantly better than required for the NLC design luminosity. (LINAC 96); Geneva, Switzerland: August 26-30, 1996 * .
Presented at the XVIII International Linac Conference
*Work supported by Department of Energy contract DE-AC03-76SF00515.
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AbstractThe main linacs of the next generation of linear colliders need to accelerate the particle beams to energies of up to 750 GeV while maintaining very small emittances. This paper describes the main mechanisms of static emittance growth in the main linacs of the Next Linear Collider (NLC). We present detailed simulations of the trajectory and emittance control algorithms that are foreseen for the NLC. We show that the emittance growth in the main linacs can be corrected down to about 110%. That number is significantly better than required for the NLC design luminosity.
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