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Particle Beam Sources and Techniques

Description:

Grant applications are sought to develop (1) particle beam ion sources and-or associated components with improved intensity, emittance, and range of species; (2) methods and-or devices for reducing the emittance of relativistic ion beams such as coherent electron cooling, and electron or optical-stochastic cooling; (3) methods and devices to increase the charge state of ion beams (e.g., by the use of special electron-cyclotron-resonance ionizers, electron-beam ionizers, or special stripping techniques); methods and -or devices for improving emission capabilities of photocathode sources, such as improving charge lifetime, bunch charge, average current, emittance, or energy spread. (5) techniques for in situ beam pipe surface coating to reduce the ohmic resistance and-or secondary electron yield; (6) high brightness electron beam sources utilizing continuous wave (cw) superconducting RF cavities with integral photocathodes operating at high acceleration gradients; (7) techniques and devices for measuring RF resistivity of cryogenically cooled coated tubes. Accelerator techniques for an energy recovery linac (ERL) and a circulator ring (CR) based electron cooling facility for cooling medium to high energy bunched proton or ion beams are of high interest for next generation colliders for nuclear physics experiments. Therefore, grant applications are sought for (1) design, modeling and proto-type development for a magnetized electron source-injector with a high bunch charge (up to 2 nC) and high average current (above 100 mA) and high bunch repetition rate (up to 75 MHz); (2) designs, modeling, and hardware and component development for a fast beam-switching kicker with 0.5 ns duration and 10 to 20 kW power in the range of 5-50 MHz repetition rate; and (3) optics designs and tracking simulations of beam systems for ERLs and CRs, with energy range from 5 to 130 MeV, and transporting and matching magnetized beams with superconducting solenoids in cooling channels. Examples of candidate technologies include photo- or thermionic-cathode electron guns with a DC or RF accelerating structure; SRF deflecting cavity, pulse compression techniques, and beam-based kicker. Grant applications also are sought to develop computer software for the design, modeling and simulating any of these devices and beam transport systems. A full utilization of the discovery potential of a next-generation electron-ion collider requires a full-acceptance detection system that can provide detection of reaction products scattered at small angles with respect to the incident beams over a wide momentum range. Grant applications are sought for design, modeling, and hardware development of the special magnets for such a detection system. Magnets of interest include (1) radiation-resistant superconducting ( 2 T pole-tip field) septum dipole with electronically adjustable field orientation (+-- 100 mrad); (2) radiation-resistant high-field ( 9 T pole-tip field), large-aperture ( 20 cm radius) quadrupole; (3) radiation-resistant superconducting ( 6 T pole-tip field) large-aperture ( 20 cm radius) small-yoke-thickness ( 14 cm OD-ID) quadrupole; (4) radiation-resistant super-conducting ( 6 T pole-tip field, ~3 cm IR) combined-function magnet with quadrupole and independently adjustable horizontal and vertical dipole field components Grant applications are sought to develop beam absorbers for energy-recovery linac driven medical isotope facilities. In such facilities an energy-recovering electron beam interacts with a thin high-Z target. After interaction with the thin target, the beam halo generated must be deposited in a controlled way and absorbed downstream of the target but before substantial bending for energy recovery. High efficiency in beam absorption leads to higher electron beam current and to higher possible overall production rates in the facility. Lastly, grant applications are sought to develop software that adds significantly to the state-of-the-art in the simulation of beam physics. Areas of interest include (1) electron cooling, (2) intra-beam and interbeam scattering, (3) spin dynamics, (4) polarized beam generation including modeling of cathode geometries for high current polarized electron sources, (5) generating and transporting polarized electron beam, (6) beam dynamics, transport and instabilities; and (7) electron or plasma discharge in vacuum under the influence of charged beams. The software should use modern best practices for software design, should run on multiple platforms, and should run in both serial and parallel configurations. Grant applications also are sought to develop graphical user interfaces for problem definition and setup.
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