Storage Ring Operation Modes

Standard Operating Mode, top-up

• Fill pattern:
  102 mA in 24 singlets (single bunches) with a nominal current of 4.25 mA and a spacing of 153 nanoseconds between singlets.

• Lattice configuration:
  Low emittance lattice with effective emittance of 3.1 nm-rad and coupling of 1%.

• Bunch length (rms):
  33.5 ps.

• Refill schedule:
  Continuous top-up with single injection pulses occurring at a minimum of two minute intervals, or a multiple of two minute intervals.

Special Operating Mode - 324 bunches, non top-up

• Fill pattern:
  102 mA in 324 uniformly spaced singlets with a nominal single bunch current of 0.31 mA and a spacing of 11.37 nanoseconds between singlets.

• Lattice configuration:
  Low emittance lattice with effective emittance of 3.1 nm-rad and coupling of 1%.

• Bunch length (rms):
  22 ps.

• Refill schedule:
  Fill-on-fill two times per day, nominally at 7:45 AM and 7:45 PM. Lifetime is expected to be around 60 hours. There should be about 80 mA remaining at the time of each refill.

Special Operating Mode - hybrid fill, top-up

• Fill pattern:
  Total current is 102 mA. A single bunch containing 16 mA isolated from the remaining bunches by symmetrical 1.594 microseconds gaps. The remaining current is distributed in 8 group of 7 consecutive bunches with a maximum of 11 mA per group, a periodicity of 68 ns, and a gap of 51 ns between groups. The total length of the bunch train is 500 ns.

• Lattice configuration:
  Low emittance lattice with effective emittance of 3.1 nm-rad and coupling of 1% to 1.5%.

• Bunch length (rms):
  Singlet: 50 ps, septuplets: 27 ps.

• Refill schedule:
  Continuous top-up with single injection pulses occurring at a minimum of 1 minute intervals, or a multiple of one minute intervals.

Special Operating Mode - 1296 bunches, non top-up

• Fill pattern:
  102 mA in 1296 uniformly spaced singlets with a nominal single bunch current of 0.079 mA and a spacing of 2.84 nanoseconds between singlets.

• Lattice configuration:
  Low emittance lattice with effective emittance of 3.1 nm-rad and coupling of 1%.

• Bunch length (rms):
  22 ps.

• Refill schedule:
  Fill-on-fill two times per day, nominally at 7:45 AM and 7:45 PM. Lifetime is expected to be around 100 hours. There should be about 85 mA remaining at the time of each refill.

Special Operating Mode - Reduced horizontal beam size (RHB)

• Fill pattern:
  Can be any bunch pattern from listed above patterns.

• Lattice configuration:
  Low emittance lattice with slightly increased effective emittance of 3.4 nm-rad and coupling of 1%. The lattice has one or two locations with significantly reduced horizontal beam size: sectors 8 and/or 32 has horizontal beam size of 120 $\mu$m at their ID locations (instead of nominal 280 $\mu$m) at expence of increased divergence. All other radiation points are kept without changes.

• Bunch length (rms):
  Dependent on bunch pattern.

• Refill schedule:
  Dependent on bunch pattern.