Performance Limitations of the CERN SPS Collider

Evans, Lyn; Gareyte, J.

doi:10.1109/tns.1985.4333870

Cited by 14 publications

(15 citation statements)

References 2 publications

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“…The expressions for the growth rates can be integrated in time to find x , y , σ p at any later time. The results of the theory have been tested experimentally [7,8].…”

Section: Computations Of Intra-beam Scattering Growth Timesmentioning

confidence: 99%

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Measurements of intra-beam scattering growth times with gold beam below transition in RHIC

Fischer

Bai²,

Blaskiewicz³

et al.

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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While RHIC is filled with beam, bunches are stored for up to several minutes at the injection energy before acceleration starts. In gold operation, the RHIC injection energy is below transition. A bunch length increase, and correspondingly an increase in the longitudinal emittance, can lead to particle loss during transition crossing and rebucketing into the storage buckets. The longitudinal growth of gold beams in RHIC at injection is dominated by intra-beam scattering. Measurements of longitudinal growth times are presented and compared with computations.

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“…The expressions for the growth rates can be integrated in time to find x , y , σ p at any later time. The results of the theory have been tested experimentally [7,8].…”

Section: Computations Of Intra-beam Scattering Growth Timesmentioning

confidence: 99%

“…[6] for a more complete list). A number of computer codes were developed and tested with beam measurements [7,8,9]. With heavy ion beams at energies not attained thus far, the Relativistic Heavy Ion Collider (RHIC) allows measurements of intra-beam scattering in a new parameter regime.…”

Section: Introductionmentioning

confidence: 99%

Measurements of intra-beam scattering growth times with gold beam below transition in RHIC

Fischer

Bai²,

Blaskiewicz³

et al.

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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“…the ratio between the bunch population and its longitudinal and transverse emittances) largely surpassing that of the other multi-bunch beams produced so far by the accelerators of the LHC injector chain. The nominal bunch intensity has already been accelerated in the SPS during p-pbar operation, albeit with different longitudinal emittance and bunch length [1]. The main bunch parameters at SPS injection and at SPS extraction are presented in Table 1 for nominal and ultimate LHC beam operation.…”

Section: Introductionmentioning

confidence: 99%

Fast vertical single-bunch instability at injection in the CERN SPS - an update

Arduini

Bohl

Burkhardt

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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Following the first observation of a fast vertical instability for a single high-brightness bunch at injection in the SPS in 2002, a series of detailed measurements and simulations has been performed in order to assess the resulting potential intensity limitations for the SPS, as well as possible cures. During the 2006 run, the characteristics of this instability were studied further, extending the intensity range of the measurements, and comparing the experimental data with simulations that take into account the latest measurements of the transverse machine impedance. In this paper, we summarize the outcome of these studies and our understanding of the mechanisms leading to this instability. The corresponding intensity limitations were also determined. EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH CERN -AB Department AbstractFollowing the first observation of a fast vertical instability for a single high-brightness bunch at injection in the SPS in 2002, a series of detailed measurements and simulations has been performed in order to assess the resulting potential intensity limitations for the SPS, as well as possible cures. During the 2006 run, the characteristics of this instability were studied further, extending the intensity range of the measurements, and comparing the experimental data with simulations that take into account the latest measurements of the transverse machine impedance. In this paper, we summarize the outcome of these studies and our understanding of the mechanisms leading to this instability. The corresponding intensity limitations were also determined.

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“…Intrabeam scattering measurements have been performed primarily on hadronic [20,21,22,23] and heavy ion machines [24,25], where the effect tends to be more pronounced, though measurement reports on low emittance electron rings can also be found [26,27].…”

Section: Introductionmentioning

confidence: 99%

Intrabeam Scattering Analysis of Measurements at KEK's ATF Damping Ring

Bane¹

2002

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We derive a simple relation for estimating the relative emittance growth in x and y due to intrabeam scattering (IBS) in electron storage rings. We show that IBS calculations for the ATF damping ring, when using the formalism of Bjorken-Mtingwa, a modified formalism of Piwinski (where η 2 /β has been replaced by H), or a simple high-energy approximate formula all give results that agree well. Comparing theory, including the effect of potential well bunch lengthening, with a complete set of ATF steady-state beam size vs. current measurements we find reasonably good agreement for energy spread and horizontal emittance. The measured vertical emittance, however, is larger than theory in both offset (zero current emittance) and slope (emittance change with current). The slope error indicates measurement error and/or additional current-dependent physics at the ATF; the offset error, that the assumed Coulomb log is correct to within a factor of 1.75.

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Performance Limitations of the CERN SPS Collider

Cited by 14 publications

References 2 publications

Measurements of intra-beam scattering growth times with gold beam below transition in RHIC

Measurements of intra-beam scattering growth times with gold beam below transition in RHIC

Fast vertical single-bunch instability at injection in the CERN SPS - an update

Intrabeam Scattering Analysis of Measurements at KEK's ATF Damping Ring

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