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Open Access Publications from the University of California

Non-gaussian beam tails at the Advanced Light Source

  • Author(s): Zholents, A.
  • Decking, W.
  • et al.

The coordinate and energy distributions of the electron beam density at the Advanced Light Source have been obtained from measurements of the beam lifetime at various storage-ring apertures in the horizontal and vertical planes. It is shown that these distributions have a gaussian core extended approximately up to five rms beam sizes. Beyond this point the electron density is defined by the electron scattering on the residue gas and electron intra-beam scattering and decreases as the cubic of the distance from the beam center. This behavior continues approximately up to ~;30 rms beam sizes in the horizontal plane and ~;60 rms beam sizes in the vertical plane. The horizontal and vertical emittances obtained from the measurements near the beam core suggest a presence of ~; 8.5 percent coupling in the ring at the time of measurements.

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