Enhanced Optical Cooling of ion beams for LHC

Abstract

The possibility of the enhanced optical cooling (EOC) of Lead ions in LHC is investigated. Nonexponential feature of cooling and requirements to the ring lattice, optical and laser systems are discussed. Comparison with optical stochastic cooling (OSC) is represented.

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

“…In this case the electric field strength is determined by the replacement of the energy 1 em ph (7) and the frequency of the emission of photons , where…”

“…Below we investigate the possibility of lead ions cooling (Z=82) in the storage ring LHC based on using the version 5 (section 3) of EOC. We take the example 2 considered in [7]. In this case the energy eV, ( (20) is satisfied.…”

“…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].…”

Enhanced Optical Cooling of Particle Beams in Storage Rings

“…where , The electric field value (4) does not interact with their URWs every turn, the jumps of the electron closed orbit lead to lesser jumps of the amplitude of synchrotron and betatron oscillations [6]. According to (6), the damping time in the longitudinal plane is short (proportional to the energy spread, not to the initial energy of particles). Moreover, because of nonexponential decay the degree of cooling can be much higher than 1/e reduction of the beam emittance.…”