Abstract
We propose using an optical parametric amplifier, with a $\ensuremath{\sim}12\text{ }\ensuremath{\mu}\mathrm{m}$ wavelength, for optical-stochastic cooling of $^{79}\mathrm{Au}$ ions in the Relativistic Heavy Ion Collider. While the bandwidth of this amplifier is comparable to that of a Ti:sapphire laser, it has a higher average output power. Its wavelength is longer than that of the laser amplifiers previously considered for such an application. This longer wavelength permits a longer undulator period and higher magnetic field, thereby generating a larger signal from the pickup undulator and ensuring a more efficient interaction in the kicker undulator, both being essential elements in cooling moderately relativistic ions. The transition to a longer wavelength also relaxes the requirements for stability of the path length during ion-beam transport between pickup and kicker undulators.
Highlights
Electron cooling was proposed as a mechanism to counteract the growth of emittance and beam loss due to intrabeam scattering (IBS) in the Relativistic Heavy Ion Collider (RHIC) [1]
We propose using an optical parametric amplifier, with a 12 m wavelength, for optical-stochastic cooling of 79Au ions in the Relativistic Heavy Ion Collider
In all possible applications of optical-stochastic cooling (OSC) to heavy particles, including 79Au ions in the RHIC, the power required in such a system appears to be several orders of magnitude larger than that feasible with modern optical amplifiers [6]
Summary
Electron cooling was proposed as a mechanism to counteract the growth of emittance and beam loss due to intrabeam scattering (IBS) in the Relativistic Heavy Ion Collider (RHIC) [1]. The interaction of a particle with amplified radiation from other particles results in heating It was shown in [5] that the balance between cooling and heating define the optimal power of the amplifier needed to achieve the ultimate cooling rate that is limited only by the bandwidth of the cooling loop, pickup-amplifier-kicker. In all possible applications of OSC to heavy particles, including 79Au ions in the RHIC, the power required in such a system appears to be several orders of magnitude larger than that feasible with modern optical amplifiers [6]. In this case, the amplifier’s power limits the cooling rate
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