Enhanced Optical Cooling of Particle Beams in Storage Rings

Abstract

A method of enhanced optical cooling (EOC) based on nonlinear selective interaction between particles and theirs amplified undulator radiation wavelets (URW) in storage rings is discussed. It leads to non-exponential fast damping. The selectivity is arranged by a moving screen located on the image plane of the optical system projecting URW there.

Polarized positrons in Jefferson lab electron ion collider (JLEIC)

“…A new approach, referred to as Polarized Electrons for Polarized Positrons (PEPPo) technique [16,17,18], has been investigated at the CEBAF of the Thomas Jefferson National Accelerator Facility. Taking advantage of advances in high polarization, high intensity electron sources [28], it exploits the fact that polarized photons generated by the bremsstrahlung radiation of low energy longitudinally polarized electrons within a high-Z target produce polarized e + e --pairs.…”

“…A new approach, referred to as the Polarized Electrons for Polarized Positrons (PEPPo) technique [16,17], has been investigated at the Continuous Electron Beam Accelerator Facility (CEBAF) of the Thomas Jefferson National Accelerator Facility. Polarized positrons are generated by the bremsstrahlung radiation of low energy longitudinally polarized electrons within a high-Z target and e + e -pair production.…”

Proposal for an Enhanced Optical Cooling system test in an electron storage ring

“…The screen permits us to select in pickup undulator electrons with positive deviations of both betatron and synchrotron oscillations, and such a way to produce effective cooling both in the transverse and longitudinal direction (we suggested 0 x η ≠ in pickup and kicker undulators in this case). Using the number of kicker undulators permits to cool the beam either in two directions or in the transverse or in the longitudinal directions only by selecting corresponding distances between kicker undulators [4], [6].…”

“…Several methods for the particle beam cooling are in hand now: (i) radiation cooling, (ii) electron cooling, (iii) stochastic cooling, (iv) optical stochastic cooling, (v) laser cooling, (vi) ionization cooling, and (vii) radiative (stimulated radiation) cooling [1][2][3]. Recently a new method of EOC was suggested [4][5][6][7] and in this proposal we discuss an experiment which might test this method in an existing electron storage ring having maximal energy ~ 2.5 GeV, and which can also function down to energies of ~100-200 MeV. Figure1: The scheme of the EOC of a particle beam (a) and unwrapped optical scheme (b) EOC [4] appeared as the symbiosis of enhanced emittance exchange and Optical Stochastic Cooling (OSC) [8][9][10].…”

“…OPA), optical filters, optical lenses, movable screen(s) and optical line with variable time delay (see Fig.1). An optical delay line can be used together with (or in some cases without) isochronous pass-way between undulators to keep the phases of particles such that the kicker undulator decelerates the particles during the process of cooling [6], [7].…”