Tech-X, Boulder, Colorado
BNL, Upton, Long Island, New York
Jefferson Lab, Newport News, Virginia
Novel electron-hadron collider concepts are a long-term priority for the international nuclear physics community. Effective beam cooling for intense, relativistic hadron beams will be necessary to obtain the orders-of-magnitude higher luminosities being proposed. Coherent electron cooling (CEC) [1] combines the best features of electron cooling and stochastic cooling, via free-electron laser technology [2], to offer the possibility of cooling high-energy hadron beams much faster. Many technical difficulties must be resolved via full-scale 3D simulations, before the CEC concept can be validated experimentally. The parallel VORPAL framework [3] is the ideal code for simulating the modulator and kicker regions, where the electron and hadron beams will co-propagate as in a conventional electron cooling section. We present initial VORPAL simulations of the electron density wake driven by single ions in the modulator section. Also, we present a plan for simulating the full modulator-amplifier-kicker dynamics, by through use of a loosely-coupled code suite including VORPAL, an FEL code and a beam dynamics code.
[1] Y.S. Derbenev, Proc. COOL07, 149 (2007).
[2] V.N. Litvinenko & Y.S. Derbenev, Proc. FEL07, 268 (2007).
[3] G.I. Bell et. al., J. Comp. Phys. (2008), in press.
ORNL, Oak Ridge, Tennessee
SNS is a 1.5 MW hadron beam facility; so the Beam Loss Monitor (BLM) system is a crucial part of MPS and an important tool for beam tuning. We have installed a number of Neutron Detectors (ND), Ionization Chambers and Photo-Multiplier Tubes (PMT) along the SNS beamline. In this paper we present the current status of equipment installed and experimental data obtained during SNS commissioning and operations. We compare several different types of BLMs and show advantages and disadvantages of every type. The losses are simulated by 3-D transport codes (GEANT4, SHIELD) for different loss scenarios and compared with experimental data. Also we discuss equipment issues like part obsolescence and our vision of next generation BLM system.
