[SLAC] [SLAC Pubs and Reports]
SLAC-AP-120
Precise Beam-Energy Monitor Using Synchrotron Radiation Interferometry
Abstract
A new beam monitor system capable of measuring both beam energy and its spread is proposed. Composed of two neighboring dipole magnets in a straight section of a storage ring, a high resolution monochromator, and a photon detector, the system measures the spectral interference of two synchrotron radiations (synchrotron-radiation interferometry) emitted from fringing fields of dipole magnets. The modulation spacing and depth of the photon spectrum measure the absolute beam energy and energy spread, respectively. The sensitivity of the proposed monitor is estimated for the PEP-II rings, and the technical feasibility of the experimental set-up is described in detail. The achievable resolution of absolute beam energy measurement is estimated to be Delta-E/E~x10-4 for norminal operation of the PEP-II rings, and the resolution of energy spread measurement can be attained to be sigmaE/E ~1x10-4 and 8x10-4 for the PEP's low-energy ring and high-energy ring, respectively.
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