Compensation of the Crossing Angle with Crab Cavities at KEKB

Crab cavities have been installed in the KEKB B--Factory rings to compensate the crossing angle at the collision point and thus increase luminosity. The beam operation with crab crossing has been done since February 2007. This is the first experience with such cavities in colliders or storage rings. The crab cavities have been working without serious issues. While higher specific luminosity than the geometrical gain has been achieved, further study is necessary and under way to reach the prediction of simulation.Comment: Submitted to Particle Accelerator Conference 2007, MOZAKI01, Albuquerqu

EXPERIMENTAL AND SIMULATION STUDIES OF BEAM-BEAM COMPENSATION WITH TEVATRON ELECTRON LENSES

Abstract Initially the Tevatron Electron Lenses (TELs) were intended for compensation of the beam-beam effect on the antiproton beam TEVATRON ELECTRON LENSES Three types of electron guns were developed for beambeam compensation (BBC). Currently, both electron lense

Upgrading RHIC for higher luminosity

Abstract While RHIC has only just startedrunniug for its heavy ion physics progr~in the fiist run last snmmeq we achieved 100/0of the design luminosity.In this paper we discuss plans for increasingthe luminosi~by a factor of 35 beyond the nominal design. A factor of 4 should be straightforwardby doubling the number of bunches per ring and squeezing the P* horn 2 to 1 m at selected interactionpoints.An additionalf%tor of 8 to 10 could be possible by using electron cooling to counteractintrabeam scatteringandreduce emittancesof the beams

Upgrading RHIC for higher luminosity

Abstract While RHIC has only just startedrunniug for its heavy ion physics progr~in the fiist run last snmmeq we achieved 100/0of the design luminosity.In this paper we discuss plans for increasingthe luminosi~by a factor of 35 beyond the nominal design. A factor of 4 should be straightforwardby doubling the number of bunches per ring and squeezing the P* horn 2 to 1 m at selected interactionpoints.An additionalf%tor of 8 to 10 could be possible by using electron cooling to counteractintrabeam scatteringandreduce emittancesof the beams

FIRST TEST RESULTS OF RF GUN FOR THE RACE-TRACK MICROTRON RECUPERATOR OF BINP SB RAS*

Abstract A new electron source for the Race-Track Microtron Recuperator is being developed by BINP SB RAS. It will increase average beam current and brightness of synchrotron radiation. Instead of the static 300kV electron gun operated now we are developing RF gun with the same energy of electrons. This RF gun consists of RF cavity with a gridded thermo cathode mounted on the back wall. RF cavity is driven by a 60 kW generator with last stage equipped by GU101A tetrode tube. Operational frequency of the cavity is 90.2 MHz. It is equal to the second subharmonic of the Microtron RF system frequency. A set of low power electronics controls amplitude of the cavity voltage and its tuner. This system, including a diagnostics beam line, has been installed to serve as a test bench to test the RF cavity and for beam dynamics studies. In continuous regime the designed 300 kV voltages at the acceleration gap is obtained. This paper summarizes the first test results of the cavity in this configuration

Single-Bunch Instability Of Positron Beams In Electron

Single-bunch instability of a short and dense positron beam in a photo-electron plasma is studied numerically using code LCODE. The code was originally developed for studies of plasma wakefield acceleration. It is twodimensional and fully relativistic, with both the beam and electrons modelled by macro-particles. The instability is shown to affect the rear part of the beam, right after the arrival of nearby electrons to the axis. As the result, the emittance of the whole beam grows exponentially. The instability can be stabilized by an external longitudinal magnetic field. The field does not itself stabilize the instability, but prevents the electrons from going to axis once they are thrown to the wall by the previous bunch