Control of Intra-Bunch Vertical Instabilities at the SPS - Measurements and Technology Demonstration

Fox, John; Bartosik, Hannes; De Santis, Stefano; Dusatko, John; HÃ¶fle, Wolfgang; Li, Kevin; MÃ©tral, Elias; Rivetta, Claudio; Salvant, Benoit; Turgut, Ozhan; Wehrle, Urs

doi:10.18429/JACoW-IPAC2017-TUPIK119

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RIS citation export for TUPIK119: Control of Intra-Bunch Vertical Instabilities at the SPS - Measurements and Technology Demonstration

TY - CONF
AU - Fox, J.D.
AU - Bartosik, H.
AU - De Santis, S.
AU - Dusatko, J.E.
AU - HÃ¶fle, W.
AU - Li, K.S.B.
AU - MÃ©tral, E.
AU - Rivetta, C.H.
AU - Salvant, B.
AU - Turgut, O.
AU - Wehrle, U.
ED - Schaa, Volker RW
ED - Arduini, Gianluigi
ED - Pranke, Juliana
ED - Seidel, Mike
ED - Lindroos, Mats
TI - Control of Intra-Bunch Vertical Instabilities at the SPS - Measurements and Technology Demonstration
J2 - Proc. of IPAC2017, Copenhagen, Denmark, 14â19 May, 2017
C1 - Copenhagen, Denmark
T2 - International Particle Accelerator Conference
T3 - 8
LA - english
AB - We present recent measurements demonstrating control of unstable beam motion in single bunch and bunch train configurations at the SPS. The work is motivated by anticipated intensity increases from the LIU and HL-LHC upgrade programs, and has included the development of a GHz bandwidth reconfigurable 4 GS/S signal processor with wideband kickers and associated amplifiers. The system was operated at 3.2GS/s with 16 samples across a 5 ns RF bucket (4.2 ns bunch at injection). The experimental results confirm damping of intra-bunch instabilities in both Q20 and Q26 optics configurations for intensities of 2x10¹¹ P/bunch. Instabilities with growth times of 200 turns are well-controlled from injection, consistent with the achievable gains for the 2 installed stripline kickers with 1 kW broadband power. Measurements from multiple studies in single-bunch and bunch train configurations show achieved damping rates, control of multiple intra-bunch modes, behavior of the system at injection and final damped noise floor. We present an analysis method to study the relative phase of slice motion during a transient to discriminate between TMCI and other types of Head-Tail instabilities.
PB - JACoW
CP - Geneva, Switzerland
SP - 2005
EP - 2007
KW - feedback
KW - controls
KW - injection
KW - kicker
KW - optics
DA - 2017/05
PY - 2017
SN - 978-3-95450-182-3
DO - 10.18429/JACoW-IPAC2017-TUPIK119
UR - http://jacow.org/ipac2017/papers/tupik119.pdf
ER -