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Effect of kicker parameters on extraction cell length

Effect of kicker parameters on extraction cell length. R. Apsimon. Extraction cell design. L kick. L drift. L sep 1. L sep2. The lengths defined on the above diagram are the variables used to minimise the extraction cell length.

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Effect of kicker parameters on extraction cell length

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  1. Effect of kicker parameters on extraction cell length R. Apsimon

  2. Extraction cell design Lkick Ldrift Lsep1 Lsep2 The lengths defined on the above diagram are the variables used to minimise the extraction cell length. Quad strengths in ext cell and matching cell used to match Twiss parameters at end of ext cell (5 quads in total). Fixed parameters The length of the quadrupoles and the a space either side of the kicker and septa (Lgap) are considered to be unchangeable. Lgapis required for bellows and diagnostics (eg. BPMs).

  3. “Nominal” beam and machine parameters Beam and Machine Parameters Beam envelope D is the local dispersion and β is the local beta function

  4. Kicker and septum parameters Septum parameters Kicker parameters

  5. Parameter scans • Reduce final quad radius (Rquad) • Reduces Lsep2 • Increase kicker stripline voltage (Vkick) • Reduces Lkick and Ldrift • Reduce kicker aperture (Akick) • Same effect as increasing stripline voltage • Reduce thin septum thickness (Xsep1) • Reduces Lkick and Ldrift • Increases Lsep1

  6. Scan of quadrupole radius

  7. Scan of stripline voltage

  8. Scan of kicker aperture

  9. Scan of thin septum thickness“relaxed tolerances” Mechanical tolerance = 1mm Closed orbit tolerance = 1mm

  10. Scan of thin septum thickness“strict tolerances” Mechanical tolerance = 0.5mm Closed orbit tolerance = 0.5mm 25-30cm reduction in cell length, independent of other parameters

  11. Parameter space local minima

  12. Parameter space local minima

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