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1.
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A 4 GS/sec Instability Feedback Processing System for Intra-bunch Instabilities
/ Dusatko, J (SLAC) ; Cesaratto, J M (SLAC) ; Fox, J D (SLAC) ; Pollock, K (SLAC) ; Rivetta, C H (SLAC) ; Turgut, O (SLAC) ; Hofle, W (CERN)
We present the architecture and implementation overview of a proof-of-principle digital signal processing system developed to study control of Electron-Cloud and Transverse Mode Coupling Instabilities (TMCI) in the CERN SPS. This system is motivated by intensity increases planned as part of the High Luminosity LHC upgrade. [...]
SLAC-PUB-15830; IPAC-2013-WEPME059.-
2013 - 3 p.
- Published in : (2013) , pp. WEPME059
Fulltext: PDF; External link: Published version from JACoW
In : 4th International Particle Accelerator Conference, Shanghai, China, 12 - 17 May 2013, pp.3067
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2.
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A wideband slotted kicker design for SPS transverse intra-bunch feedback
/ Cesaratto, J M (SLAC) ; Fox, J D (SLAC) ; Rivetta, C H (SLAC) ; Alesini, D (Frascati) ; Gallo, A (Frascati) ; Zobov, M (Frascati) ; De Santis, S (LBNL, Berkeley) ; Hofle, W (CERN)
In order for the SPS to meet the beam intensity demands for the HL-LHC upgrade, control and mitigation of trans- verse beam instabilities caused by electron cloud and TMCI will be essential. For this purpose a wideband intra-bunch feedback method has been proposed, based on a 4 GS/s front end data acquisition and processing, and on a back end frequency response extending to at least 1 GHz. [...]
IPAC-2014-TUPRI087.-
2014 - 3 p.
- Published in : , pp. TUPRI087
External links: JACOW; Published version from JACoW
In : 5th International Particle Accelerator Conference, Dresden, Germany, 15 - 20 Jun 2014, pp.TUPRI087
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3.
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The hardware implementation of the CERN SPS ultrafast feedback processor demonstrator
/ Dusakto, J E (SLAC) ; Cesaratto, J M (SLAC) ; Fox, J D (SLAC) ; Olsen, J (SLAC) ; Rivetta, C H (SLAC) ; Höfle, W (CERN)
An ultrafast 4GSa/s transverse feedback processor has been developed for proof-of-concept studies of feedback control of e-cloud driven and transverse mode coupled intra-bunch instabilities in the CERN SPS. This system consists of a high-speed ADC on the front end and equally fast DAC on the back end. [...]
2013
Published version from JACoW: PDF;
In : 2nd International Beam Instrumentation Conference, Oxford, UK, 16 - 19 Sep 2013, pp.MOPC28
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4.
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A Wideband Slotted Kicker Design for SPS Transverse Intra-Bunch Feedback
/ Cesaratto, John M (SLAC) ; Alesini, D (Frascati) ; DeSantis, S (LBNL, Berkeley) ; Drago, A (Frascati) ; Fox, J D (SLAC) ; Gallo, A (Frascati) ; Hofle, W (CERN) ; Marcellini, F (Frascati) ; Rivetta, C H (SLAC) ; Zobov, M (Frascati)
Control and mitigation of transverse beam instabilities caused by electron cloud and TMCI will be essential for the SPS to meet the beam intensity demands for the HL-LHC upgrade. A wideband intra-bunch feedback method is in development, based on a 4 GS/s data acquisition and processing, and with a back end frequency structure extending to 1 GHz. [...]
SLAC-PUB-15498.-
2013 - 3 p.
External link: SLAC
In : 4th International Particle Accelerator Conference, Shanghai, China, 12 - 17 May 2013, pp.3073
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5.
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SPS Wideband Transverse Feedback Kicker: Design Report
/ Cesaratto, J M ; Fox, J D ; Rivetta, C H ; Alesini, D ; Drago, A ; Gallo, A ; Marcellini, F ; Zobov, M ; De Santis, S ; Paret, Z et al.
The SPS wideband transverse feedback system is being developed to control vertical beam instabilities arising from intensity dependent effects like electron cloud instability (ECI) and the transverse mode coupling instability (TMCI). [...]
CERN-ACC-NOTE-2013-0047.
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2013. - 20 p.
SPS_Wideband_Transverse_Feedback-CERN-ACC-NOTE-2013-0047-20131220
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6.
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Excitation of Intra-bunch Vertical Motion in the SPS - Implications for Feedback Control of Ecloud and TMCI Instabilities
/ Cesaratto, John (SLAC) ; Fox, J D (SLAC) ; Pivi, M T (SLAC) ; Rivetta, C H (SLAC) ; Turgut, O (SLAC) ; Uemura, S (SLAC) ; Hofle, W (CERN) ; Wehrle, U (CERN)
Electron cloud (ecloud) and transverse mode coupledbunch instabilities (TMCI) limit the bunch intensity in the CERN SPS. This paper presents experimental measurements in the SPS of single-bunch motion driven by a GHz bandwidth vertical excitation system [1]. [...]
SLAC-PUB-15046.-
2012 - 3 p.
- Published in : Conf. Proc.: C1205201 (2012) , pp. MOEPPB015
External link: Published version from JaCoW
In : 3rd International Particle Accelerator Conference, New Orleans, LA, USA, 20 - 25 May 2012, pp.112-114
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7.
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Estimation of Ecloud and TMCI Driven Vertical Instability Dynamics from SPS MD Measurements - Implications for Feedback Control
/ Turgut, O (SLAC) ; Bullitt, A (SLAC) ; Fox, J D (SLAC) ; Ndabashimiye, G (SLAC) ; Rivetta, C H (SLAC) ; Swiatlowski, M (SLAC) ; Höfle, W (CERN) ; Salvant, B (CERN) ; Secondo, R (LBL, Berkeley)
We present analysis of beam motion data obtained in high intensity SPS MD studies in 2009 and 2010. The single-bunch vertical E-cloud motion seen in parts of the bunch train after injection shows large tune shifts (roughly 0.02 above the 0.185 tune) developing between tail and head of unstable bunches. [...]
2011
External link: Published version from JACoW
In : 2011 Particle Accelerator Conference, New York City, NY, USA, 28 Mar - 1 Apr 2011, pp.WEP199
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8.
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Simulation Results of a Feedback Control System to Damp Electron Cloud Single-Bunch Transverse Instabilities in the CERN SPS
/ Secondo, R (LBL, Berkeley) ; Vay, J -L (LBL, Berkeley) ; Venturini, M (LBL, Berkeley) ; Fox, J D (SLAC) ; Rivetta, C H (SLAC) ; Höfle, W (CERN)
Transverse Single-Bunch Instabilities due to Electron Cloud effect are limiting the operation at high current of the SPS at CERN. Recently a high-bandwidth Feedback System has been proposed as a possible solution to stabilize the beam and is currently under study. [...]
2011
External link: Published version from JACoW
In : 2011 Particle Accelerator Conference, New York City, NY, USA, 28 Mar - 1 Apr 2011, pp.WEP153
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9.
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Mathematical Models of Feedback Systems for Control of Intra-Bunch Instabilities Driven by E-Clouds and TMCI
/ Rivetta, C H (SLAC) ; Fox, J D (SLAC) ; Mastoridis, T (SLAC) ; Pivi, M T F (SLAC) ; Turgut, O (SLAC) ; Höfle, W (CERN) ; Secondo, R (LBL, Berkeley) ; Vay, J L (LBL, Berkeley)
The feedback control of intrabunch instabilities driven by E-Clouds or strong head-tail coupling (TMCI) requires sufficient bandwidth to sense the vertical position and drive multiple sections of a nanosecond scale bunch. These requirements impose challenges and limits in the design and implementation of the feedback system. [...]
2011
External link: Published version from JACoW
In : 2011 Particle Accelerator Conference, New York City, NY, USA, 28 Mar - 1 Apr 2011, pp.WEP079
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10.
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Studies of RF Noise Induced Bunch Lengthening at the LHC
/ Mastoridis, T (SLAC) ; Fox, J D (SLAC) ; Rivetta, C H (SLAC) ; Baudrenghien, P (CERN) ; Butterworth, A C (CERN) ; Molendijk, J C (CERN)
Radio Frequency noise induced bunch lengthening can strongly affect the Large Hadron Collider performance through luminosity reduction, particle loss, and other effects. Models and theoretical formalisms demonstrating the dependence of the LHC longitudinal bunch length on the RF station noise spectral content have been presented*,**. [...]
2011
External link: Published version from JACoW
In : 2011 Particle Accelerator Conference, New York City, NY, USA, 28 Mar - 1 Apr 2011, pp.MOODS3
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