Abstract
The study of magnetized electron beam has become a high priority for its use in ion beam cooling as part of electron ion colliders and the potential of easily forming flat beams for various applications. In this paper, a purpose-specific diagnostic is described with the intention of studying transverse magnetized beam properties. The device is a modification to the classic pepper-pot, used in this context to measure the uncorrelated components of transverse emittance in addition to the typical effective emittance. The limitations of traditional methods are discussed, and simulated demonstrations of the new technique shown.
Highlights
Research at Thomas Jefferson National Accelerator Facility (JLab) has recently focused on the production of magnetized electron beams [1,2] for use within an electron cooler for the Jefferson Laboratory Electron Ion Collider (JLEIC) [3]
Due to the conservation of momentum, electrons gain angular momentum as they exit through the fringe of the magnetic field
It is estimated that the cooling rate between a copropagating electron and ion beam in a solenoid channel could be improved by about two orders of magnitude if the electron bunch was not following Larmor rotations as it would with a typical electron beam [4,5]. The angular momentum it has in free space can be removed precisely through the fringe fields of the cooling channel solenoid, such that it does not make large Larmor rotations, effectively reducing the emittance inside the solenoid
Summary
Research at Thomas Jefferson National Accelerator Facility (JLab) has recently focused on the production of magnetized electron beams [1,2] for use within an electron cooler for the Jefferson Laboratory Electron Ion Collider (JLEIC) [3]. The angular momentum it has in free space can be removed precisely through the fringe fields of the cooling channel solenoid, such that it does not make large Larmor rotations, effectively reducing the emittance inside the solenoid. The concept for the JLEIC cooler is to produce a bunched magnetized beam in the injector which is transported, without degradation, via a multipass energy recovery linac to a cooling solenoid [6,7]. A further consideration is DC guns typically have a low electric field gradient at the cathode, and provide low overall energy gain (< 500 keV) This results in an operating regime where the beam dynamics of both space-charge forces in the electron bunch must be managed with the magnetized rotation. A diagnostic which quantifies the quality of magnetization and emittance is of value both experimentally and as a simulation benchmarking tool
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