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The SPS Wideband Feedback Processor: A Flexible FPGA-Based Digital Signal Processing Demonstration Platform for Intra-Bunch Beam Stability Studies
/ Dusatko, John (SLAC) ; Bjørsvik, Endre (CERN) ; Fox, John (SLAC) ; Höfle, Wolfgang (CERN) ; Rivetta, Claudio (SLAC) ; Turgut, Ozhan (Stanford U.)
A flexible digital signal processing platform based on FPGA technology has been developed for vertical intra-bunch beam stability studies at the CERN SPS. This system is unique in that samples at a very high rate (4GSa/s) in order to measure and control motion within the 1.7ns proton beam bunch. [...]
2018 - 5 p.
- Published in : 10.18429/JACoW-IBIC2017-WE1AB1
Fulltext: PDF;
In : 6th International Beam Instrumentation Conference, Grand Rapids, MI, USA, 20 -24 Aug 2017, pp.WE1AB1
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Impact of a Wideband Feedback Prototype System on TMCI in the SPS
/ Höfle, Wolfgang (CERN) ; Bartosik, Hannes (CERN) ; Bjørsvik, Endre (CERN) ; Dusatko, John (SLAC) ; Fox, John (SLAC) ; Kotzian, Gerd (CERN) ; Levens, Thomas (CERN) ; Li, Kevin (CERN) ; Rivetta, Claudio (SLAC) ; Turgut, Ozhan (Stanford U.)
The transverse mode coupling instability (TMCI) in the SPS has been identified as one of the potential performance limitations for future high intensity LHC beams that will be required for the High Luminosity (HL)-LHC era and is being addressed by the LHC Injector Upgrade Project (LIU). A potential mitigation can be provided by wideband feedback systems with a frequency reach of about 1 GHz . [...]
CERN-ACC-2018-169.-
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-TUZGBD4
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUZGBD4
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Control of Intra-Bunch Vertical Motion in the SPS with GHz Bandwidth Feedback
/ Fox, John (SLAC) ; Bartosik, Hannes (CERN) ; Bjørsvik, Endre (CERN) ; De Santis, Stefano (LBNL, Berkeley) ; Dusatko, John (SLAC) ; Höfle, Wolfgang (CERN) ; Kotzian, Gerd (CERN) ; Li, Kevin (CERN) ; Métral, Elias (CERN) ; Rivetta, Claudio (SLAC) et al.
A GHz bandwidth vertical beam feedback system has been in development at the CERN SPS for control of unstable vertical beam motion in single bunch and bunch train configurations. We present measurements and recent studies of stable and unstable motion for intensities up to 2 × 1011 p/bunch[1]. [...]
CERN-ACC-2018-170.-
2018 - 6 p.
- Published in : (2018) , pp. WEPAL079
- Published in : J. Phys.: Conf. Ser. 1067 (2018) 072024
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPAL079
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Recent Results from the Wideband Feedback System Tests at the SPS and Future Plans
/ Li, Kevin (CERN) ; Bartosik, Hannes (CERN) ; Beck, Mario (CERN) ; Bjørsvik, Endre (CERN) ; Dusatko, John (SLAC) ; Fox, John (SLAC) ; Höfle, Wolfgang (CERN) ; Kotzian, Gerd (CERN) ; Levens, Thomas (CERN) ; Rivetta, Claudio (SLAC) et al.
A high bandwidth transverse feedback demonstrator system has been devised within the LARP framework in collaboration with SLAC for the LHC Injectors Upgrade (LIU) Project. The initial system targeted the Super Proton Synchrotron (SPS) at CERN to combat TMCI and electron cloud instabilities induced for bunches with bunch lengths at the 100 MHz scale. [...]
2018 - 5 p.
- Published in : 10.18429/JACoW-HB2018-MOP2WA04
Fulltext: PDF;
In : 61st ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Daejeon, Korea, 17 - 22 Jun 2018, pp.MOP2WA04
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Control of Intra-Bunch Vertical Instabilities at the SPS - Measurements and Technology Demonstration
/ Fox, John (SLAC) ; Bartosik, Hannes (CERN) ; De Santis, Stefano (LBNL, Berkeley) ; Dusatko, John (SLAC) ; Höfle, Wolfgang (CERN) ; Li, Kevin (CERN) ; Métral, Elias (CERN) ; Rivetta, Claudio (SLAC) ; Salvant, Benoit (CERN) ; Turgut, Ozhan (SLAC) et al.
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. [...]
CERN-ACC-2017-200.-
2017 - 3 p.
- Published in : 10.18429/JACoW-IPAC2017-TUPIK119
Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPIK119
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Wideband Vertical Intra-Bunch Feedback at the SPS - Technology Development, Recent Accelerator Measurements and Next Steps
/ Fox, John (SLAC) ; Bartosik, Hannes (CERN) ; De Santis, Stefano (LBNL, Berkeley) ; Dusatko, John (SLAC) ; Höfle, Wolfgang (CERN) ; Rivetta, Claudio (SLAC) ; Salvant, Benoit (CERN) ; Turgut, Ozhan (SLAC) ; Wehrle, Urs (CERN)
A wideband vertical intra-bunch feedback system is in development at the CERN SPS for use to control potential Ecloud and TMCI instabilities. The work is motivated by planned intensity increases from the LIU and HL-LHC upgrade programs. [...]
2016 - 7 p.
- Published in : 10.18429/JACoW-IBIC2015-WECLA04
Fulltext: PDF;
In : International Beam Instrumentation Conference , Melbourne, Australia, 13 - 17 Sep 2015, pp.WECLA04
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Recent Upgrades to the CERN SPS Wideband Intra-bunch Transverse Feedback Processor
/ Dusatko, John (SLAC) ; Fox, John (SLAC) ; Höfle, Wolfgang (CERN) ; Rivetta, Claudio (SLAC) ; Turgut, Ozhan (Stanford U., Phys. Dept. ; SLAC)
In support of the CERN High Luminosity LHC (HL-LHC) upgrade program, a research and development effort has been underway to understand and develop feedback control techniques for mitigating transverse intra-bunch instabilities in the SPS driven by electron cloud and TMCI effects. These effects could be a limiting factor to overall machine performance. [...]
CERN-ACC-2016-200; CERN-ACC-2016-201.-
2016 - 3 p.
- Published in : 10.18429/JACoW-IPAC2016-WEPOR010
Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.WEPOR010
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Identification of Intra-bunch Transverse Dynamics for Feedback Control Purposes at CERN Super Proton Synchrotron
/ Turgut, Ozhan (SLAC) ; Fox, John (SLAC) ; Rivetta, Claudio (SLAC) ; Höfle, Wolfgang (CERN) ; Rock, Stephen (Stanford U., HEPL)
We present methods for parameter estimation of intra-bunch transverse beam dynamics. The dynamics is represented via reduced order linear models. [...]
2015 - 5 p.
- Published in : (2015) , pp. MOPAB24
Fulltext: PDF; External link: JACOW
In : 54th ICFA Advanced Beam Dynamics Workshop on High-Intensity, High Brightness and High Power Hadron Beams, East-Lansing, USA, 10 - 14 Nov 2014, pp.MOPAB24
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Wideband Vertical Intra-Bunch Feedback At The SPS - 2015 Results And Path Forward
/ Rivetta, Claudio (SLAC) ; De Santis, Stefano (LBL, Berkeley) ; Dusatko, John (SLAC) ; Fox, John (SLAC) ; Höfle, Wolfgang (CERN) ; Turgut, Ozhan (SLAC) ; Wehrle, U (CERN)
We present experimental measurements taken from CERN SPS machine development studies with a wideband intra-bunch feedback channel prototype. The demonstration system is a digital processing system with recently installed wideband kicker and amplifier components. [...]
CERN-ACC-2015-296.-
2015 - 3 p.
- Published in : (2015) , pp. TUAC2
Published version from JACoW: PDF; External link: JACOW
In : 6th International Particle Accelerator Conference, Richmond, VA, USA, 3 - 8 May 2015, pp.TUAC2
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Identification of Intra-Bunch Transverse Dynamics for Model Based Wideband Feedback Control at CERN Super Proton Synchrotron
/ Turgut, Ozhan (SLAC) ; Dusatko, John (SLAC) ; Fox, John (SLAC) ; Höfle, Wolfgang (CERN) ; Rivetta, Claudio (SLAC)
Multi-input multi-output (MIMO) feedback design techniques can be helpful to stabilize intra-bunch transverse instabilities induced by electron-clouds or transverse mode couplings at the CERN Super Proton Synchrotron (SPS). These MIMO techniques require a reduced order model of intra-bunch dynamics. [...]
CERN-ACC-2015-299.-
2015 - 4 p.
- Published in : (2015) , pp. MOPWI041
Published version from JACoW: PDF; External link: JACOW
In : 6th International Particle Accelerator Conference, Richmond, VA, USA, 3 - 8 May 2015, pp.MOPWI041
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