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Multi-Turn Extraction for PS2 Resonance Modification Study

Study on the principle of crossing excited resonances to modify the stable area of phase space, splitting the beam into beamlets without mechanical action for PS2. Current work focuses on resonance crossing and optimization for improved beam control. Acknowledgments to collaborators.

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Multi-Turn Extraction for PS2 Resonance Modification Study

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  1. Multiturn extraction for PS2 First results Antoine LACHAIZE LIS meeting 6/09/2010

  2. Multi-Turn extraction, principle Crossing an excited resonance modify the stable area of the phase space : some stable islands appear around a remaining core. The number of desired beamlets after capture gives us the order of the resonance to be crossed. In this way the beam is splitted into N beamlets without any mechanical action. For PS2 the beam is splitted into 5 beamlets so we cross a 4th order resonance (4 stable islands and the core) excited by an octupole. Antoine LACHAIZE LIS meeting 6/09/2010

  3. Which resonance ? Current working point for PS2 : (11.8, 6.71) 4th Order resonance νz= 11.75 The ring is tuned from 11.8 to 11.752 with classical matching process. The final tune ramp is achieved by varying central quads of each NMC cell. (PS2.MQB.MOD.3 & PS2.MQC.MOD.4). Antoine LACHAIZE LIS meeting 6/09/2010

  4. Octupoles 2 octupoles for the MTE : - One excitation octupole, located at maximum of Horizontal Beta function. - One correction octupole, to cancel the vertical coupling. Antoine LACHAIZE LIS meeting 6/09/2010

  5. Capture process Antoine LACHAIZE LIS meeting 6/09/2010

  6. MTE : First optimisation First step : to find an optimum for the octupole strength and the number of crossing turns Antoine LACHAIZE LIS meeting 6/09/2010

  7. Work to be Done • 20% of remaining particles in the core • More complete control of the beam during capture • Design of extraction bumps (W.Bartmann and al.) Acknowledgments : Massimo G., Simone G., Myriam N, Andrea F. Antoine LACHAIZE LIS meeting 6/09/2010

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