The LHC proton beam in the cern SPS: an update

Arduini, G.; Baudrenghien, P.; Bohl, Thomas; Collier, P.; Cornelis, K.; Höfle, Wolfgang; Linnecar, T.; Shaposhnikova, E.; Tückmantel, Joachim; Wenninger, J.

doi:10.1109/pac.2003.1288647

Cited by 5 publications

(4 citation statements)

References 4 publications

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“…The herepresented estimate is larger but still outmatches the emittances of conventional accelerators by more than one order of magnitude (e.g. ε n ≈ 3 μm for the CERN SPS (Arduini et al, 2003)), which clearly indicates the potential benefits of laser driven particle acceleration already at this early stage. The longitudinal emittance is defined as the product of the pulse duration and the energy spread, ε long = Δτ pulse · ΔW kin , and gives a measure for the re-compressibility of the particle beam, in analogy to the time-bandwidth-product of short laser pulses (cf.…”

Section: Comparison To Conventional Acceleratorsmentioning

confidence: 58%

“…Even if the pulse duration is conservatively approximated by the lifetime of the TNSA sheath field of roughly 10 ps, one still finds a theoretical emittance of ε long ≈ 2 · 10 −6 eVs, which is many orders of magnitude below the values achieved by conventional accelerators (e.g. ε long ≈ 0.35 eV s for CERN SPS (Arduini et al, 2003)). …”

Section: Comparison To Conventional Acceleratorsmentioning

confidence: 96%

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Laser‐Based Particle Acceleration

Schlenvoigt

Jäckel²,

Pfotenhauer³

et al. 2010

Optik & Photonik

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Using state‐of‐the‐art high‐power laser systems, we are able to routinely generate extreme energy densities and focused light intensities in a controlled laboratory environment. During the interaction of these laser pulses with matter a plasma is generated that can both sustain and support huge electric fields. These can be used as a novel type of accelerator structure for electrons and ions having properties favorable for a large number of future applications.

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Section: Comparison To Conventional Acceleratorsmentioning

confidence: 58%

Section: Comparison To Conventional Acceleratorsmentioning

confidence: 96%

Laser‐Based Particle Acceleration

Schlenvoigt

Jäckel²,

Pfotenhauer³

et al. 2010

Optik & Photonik

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“…As a result, the bunches show an increased tail population which could lead to losses at injection into the LHC due to uncaptured particles. To overcome these problems, the SPS impedance has been decreased and unused cavities have been removed [1][2][3]. Microwave instabilities are no longer observed at low energy, but coupled bunch instabilities still appear starting at energies between 200 and 280 GeV and continuing up to high energy.…”

Section: Introductionmentioning

confidence: 99%

rf amplitude modulation to suppress longitudinal coupled bunch instabilities in the CERN Super Proton Synchrotron

Vogel

Bohl

Wehrle

2005

Phys. Rev. ST Accel. Beams

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Without specific counter measures, the LHC type beam in the SPS suffers from longitudinal coupled bunch instabilities. To prevent them, the SPS impedance has been decreased over the last few years and the operation of a high frequency Landau damping system has been established. In the absence of this Landau damping system one may alternatively introduce an rf amplitude modulation to stabilize the beam. We present results obtained by this method in the SPS and considerations for a potential increase of the longitudinal beam stability in the LHC.

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“…With improved multipactoring control they should also allow low voltage without counterphasing, thus easing operation under beam loading [7]. In 2002, after the scrubbing run at the beginning of the operation year, the nominal intensity could be reached without serious problems from vacuum pressure increase due to e-cloud [6]. As a result of all upgrades to the 200 MHz RF system, this beam was stable on the flat bottom.…”

Section: Impedance Reductionmentioning

confidence: 99%

Nominal longitudinal parameters for the LHC beam in the CERN SPS

Baudrenghien

Bohl

Linnecar

et al.

Proceedings of the 2003 Bipolar/BiCMOS Circuits and Technology Meeting (IEEE Cat. No.03CH37440)

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A proton beam with the basic structure defined by the the LHC requirements, was first available for injection into the SPS in 1998. At the end of 2002, following a significant beam-studies and RF hardware upgrade programme, a beam having both the nominal LHC intensity and the correct longitudinal parameters was obtained at top energy for the first time. This beam, characterised by high local density, must satisfy strict requirements on bunch length, longitudinal emittance and bunch to bunch phase modulation for extraction to the LHC, where only very limited particle losses are acceptable. The problems to be solved came mainly from the high beam loading and microwave and coupled bunch instabilities which led both to beam losses and to unacceptably large longitudinal emittance on the flat top. In this paper the steps taken to arrive at these nominal beam parameters are presented. Large Hadron Collider Project NOMINAL LONGITUDINAL PARAMETERS FOR THE LHC BEAM IN THE CERN SPSP. Baudrenghien, T. Bohl, T. Linnecar, E. Shaposhnikova and J. Tuckmantel, CERN, Geneva, Switzerland Abstract A proton beam with the basic structure defined by the the LHC requirements, was first available for injection into the SPS in 1998. At the end of 2002, following a significant beam-studies and RF hardware upgrade programme, a beam having both the nominal LHC intensity and the correct longitudinal parameters was obtained at top energy for the first time. This beam, characterised by high local density, must satisfy strict requirements on bunch length, longitudinal emittance and bunch to bunch phase modulation for extraction to the LHC, where only very limited particle losses are acceptable. The problems to be solved came mainly from the high beam loading and microwave and coupled bunch instabilities which led both to beam losses and to unacceptably large longitudinal emittance on the flat top. In this paper the steps taken to arrive at these nominal beam parameters are presented.

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The LHC proton beam in the cern SPS: an update

Cited by 5 publications

References 4 publications

Laser‐Based Particle Acceleration

Laser‐Based Particle Acceleration

rf amplitude modulation to suppress longitudinal coupled bunch instabilities in the CERN Super Proton Synchrotron

Nominal longitudinal parameters for the LHC beam in the CERN SPS

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