LABORATORY Plans towards Higher Laminosill
The Relativistic Heavy Ion Collider ( m C ) is designed PERF0 GE AND LUMINOSITY to provide luminosity over a wide range of beam energies LIMITATIONS and species, including heavy ions, polarized protons, and tric beam collisions. In the first seven years of operation there has been a rapid increase in the achieved peak and average luminosity, substantially exceeding design values. Work is presently underway to achieve the Enhanced Design parameters. Planned major upgrades include the Electron Beam Ion Source (EBIS), RHIC-11, and construction of an electron-ion collider (eRHIC). We review the expected RHIC upgrade performance. Electron cooling and its impact on the luminosity both for heavy ions and protons are discussed in detail.
A STRAIGHT SECTION DESIGN IN RHIC TO ALLOW HEAVY ION ELECTRON COOLING
The Relativistic Heavy Ion Collider (RHIC) has been continuously producing exciting results. One of the major luminosity limitations of the present collider is the intra beam scattering. A path towards the higher luminosities requires cooling of the heavy ion beams. Two projects in parallel electron and stochastic cooling are progressing very well. To allow interaction between electrons and the RHIC beams it is necessary to redesign one of the existing interaction regions in RHIC to allow for the longer straight section with fixed and large values of the betatron functions. We present a new design of the interaction region for the electron cooling in RHIC. INRODUCTION RHIC has exceeded designed beam intensities and luminosity requirements during first few years of operation. Unfortunately, as predicted, intrabeam scattering presents a major limitation for luminosity enhancement during heavy ion collisions. The luminosity upgrade requires electron and stochastic cooling to suppress the intrabeam scattering. The average luminosity of the Au 79+ on Au 79+ collisions, should reach ~70 . 10 26 cm –2 s -1
A new conceptual design of the SNS full turn fast extraction kicker power supply system
The new conceptual design of the full turn fast extraction kicker power supply system of the Spallation Neutron Source main ring will be presented in this paper. In this design, the extraction kicker power modulators will be located outside of the tunnel, as requested by the SNS Project. Its purpose is to minimize the components inside of the synchrotron tunnel. The high voltage modulator will use Blumlein pulser and hollow-anode thyratron structure, a parallel termination resistor and two transmission cables. Main advantages include: flexible system configuration for unipolar single drive or push-pull double drive of the kicker magnets, lower charging voltage, lower beam impedance, a lower number of high voltage cables, and a large design margin for implementation and future upgrade.