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First results of the SPS MD in W39 with 25 ns beam in Q20 optics

Summary of SPS MD study conducted on 25 ns beam in Quadrupole 20 optics, evaluating stability and blow-up effects. Conditions include relevant parameters and settings to be optimized for beam performance.

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First results of the SPS MD in W39 with 25 ns beam in Q20 optics

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  1. First results of the SPS MD in W39 with 25 ns beam in Q20 optics J. Esteban Müller, T. Bohl, C. Lazaridis, E. Shaposhnikova LIU-SPS BD WG 27/09/2012

  2. Conditions for 25 ns • Nb~ 1.1 x 1011 ppb • 200 MHz voltage: 4.5 MV at FB • 800 MHz voltage: 10% of the 200 MHz • Longitudinal damper settings copied from the 50 ns operational beam • This needs to be checked • Blow-up: • Amplitude was changed in order to find good settings • Low frequency margin set to 0.85 (instead of 0.8) LIU-SPS BD WG 27/09/2012

  3. 25 ns Q20 • Unstable at FT without blow-up • Stable with blow-up, but the effect is stronger for bunches in the head and the tail of the batch • Blow-up needs to be optimized for this beam Blow-up OFF Blow-up ON LIU-SPS BD WG 27/09/2012

  4. 50 ns Q20 for LHC filling • Nb ~ 1.55 x 1011 ppb • 200 MHz voltage: 4.5 MV at FB • 800 MHz ON Blow-up OFF Blow-up ON Few bunches unstable at FT Stable LIU-SPS BD WG 27/09/2012

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