BNL, Upton, Long Island, New York, USA
A future electron ion collider "QCD test facility" is designed in the present Relativistic Heavy Ion Collider (RHIC) tunnel. Electron acceleration and de-acceleration is preformed with energy recovery linac with multiple passes. We report on a combination of a multi-pass linac with the Non-Scaling Fixed Field Alternating Gradient (NS-FFAG) arcs. A single NS-FFAG arc allow electrons to pass through the same structure with an energy range between 1.425 and 10 GeV. The NS-FFAG is placed in the existing RHIC tunnel. The 200 MeV injector bring the polarized electrons to the 1.225 GeV GeV superconducting linac. After one pass through the linac 1.425 GeV electrons enter NS-FFAG arc and after 7 passes reach the energy of 10 GeV. After collisions the beam is brought back by the NS-FFAG and decelerated to the initial energy and directed to the dump.
BNL, Upton, Long Island, New York, USA
Relativistic Heavy Ion Collider (RHIC) has been achieving record luminosities during the last decade. The latest stochastic cooling of the heavy ions like uranium achieved the largest luminosity at RHIC during the last heavy ion run. A betatron squeeze method, already used at LHC CERN, where a betatron wave is created through the arc up to the interaction region is applied at RHIC. When the heavy beam size is reduced due to stochastic cooling a dynamical beta squeeze is possible to apply in RHIC where the existing 80 cm value of beta-star could be reduced to 40 cm. This could be achieved by introducing the betatron wave in both planes throughout the arc before and after the interaction region. Higher values of dispersion and betatron functions in the arc, with a 90 degrees phase difference per FODO cell allow easier higher order chromatic corrections.
BNL, Upton, Long Island, New York, USA
A proposal for the new high luminosity L=1034 s-1 cm-2, polarized electron proton/3He and other un-polarized heavy ions eRHIC based on Electron Recovery Linacs (ERL), assumes a location in the existing tunnel of the operating Relativistic Heavy Ion Collider (RHIC). Requests of the experiments for the interaction region are very challenging: allow detection of neutrons, allow deep virtual scattering for protons-electron collisions, detection of partons with lower momentum, etc. We present an interaction region (IR) design with a vey high focusing where at the collision point IP of 5 cm, and a 10 mrad collision angle between electrons and ions using the crab cavities. We are introducing a combined function magnet for the first element in the high focusing triplet configuration to provide neutron and the lower energy parton detection, and allow at 4.5 cm distance passage of electrons through a no magnetic field region. The 200 T/m gradient quadrupoles provide very small beam size at the IP and allows a passage with a very small magnetic field for electrons.
BNL, Upton, Long Island, New York, USA
CNAO Foundation, Milan, Italy
Carbon cancer radiation therapy has clear advantages with respect to the other radiation therapy treatments. Cost of the ion cancer therapy is dominated by the delivery systems. An new design of the superconducting Non-Scaling FFAG (NS-FFAG) carbon isocentric gantry is presented. The magnet size and weight is dramatically smaller with respect to other gantries in cancer therapy treatment. The weight of the transport elements of the carbon isocentric gantry is estimated to be 1.5 tons to be compared to the 130 tons weight of the top-notch Heidelberg facility gantry.
