On the Possibility of Observing Transverse Echos in RHIC

Brüning, O; Fisher, W.; Parker, B.

doi:10.2172/1061600

Cited by 4 publications

(7 citation statements)

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“…The status of the Large Hadron-electron Collider (LHeC) and its most recent developments, were reviewed at the conference. All in all, 6 contributions on behalf of the Study Group [9,10,11,12,13,14] and one more related with physics at the LHeC [15], were presented. They contained material previously released in the Conceptual Design Report [16] and contributed to the European Strategy Update [17] plus some more recent items [18].…”

Section: Status Of the Lhecmentioning

confidence: 99%

“…Oliver Brüning [10] reviewed the accelerator project from the initial constraints to the very recent developments. Concerning the latter: the choice of optimal radiofrequency to be 801.58 MHz, the celebration of a workshop in 2013 at Daresbury (UK) on the LHeC Energy Recovery Linac (ERL) Test Facility, and the reconsideration of the luminosity expectation.…”

Section: Status Of the Lhecmentioning

confidence: 99%

“…Finally, the plans for the future were discussed by Oliver Brüning [10] and Max Klein [11]. The project is entering a phase of R&D, with CERN mandate to continue the studies towards a technical design in three years, including the development of an ERL test machine and of the ERL LHeC design.…”

Section: Pos(dis 2013)030mentioning

confidence: 99%

See 2 more Smart Citations

WG7 Highlights - Future DIS Experiments

Perez¹,

Buniatyan²,

Sabatié³

2013

Proceedings of XXI International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS 2013)

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Section: Status Of the Lhecmentioning

confidence: 99%

Section: Status Of the Lhecmentioning

confidence: 99%

See 1 more Smart Citation

WG7 Highlights - Future DIS Experiments

Perez¹,

Buniatyan²,

Sabatié³

2013

Proceedings of XXI International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS 2013)

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“…At the design stage of the machine, a fast and continuous feedback from impedance calculations or measurements to hardware builders is thus necessary. An impedance database program (ZBASE [1]) has therefore been setup and already successfully applied to estimate the LEP impedance budget: it helps keeping track of all the known impedance sources, of the corresponding betatron functions and of the input files used by different programs, such as ABCI or MAFIA, to compute high order modes and loss factors for several bunch lengths. In the near future, a further interface is foreseen to existing beam dynamics codes for detailed calculations of multibunch transverse mode-coupling and microwave instability thresholds both in the LHC and SPS.…”

Section: Introductionmentioning

confidence: 99%

Summary of the single-beam collective effects in the LHC

Ruggiero

Berg²,

Brüning³

et al.

Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)

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SUMMARY OF THE SINGLE-BEAM COLLECTIVE EFFECTS IN THE LHCBerg, J.S.; Bruening, O.; Caspers, F.; D'yachkov, M.*; Morvillo, M.; Ruggiero, F.Single beam collective effects can limit the performance of the LHC and, together with parasitic losses, impose constraints on the design of the components of the LHC vacuum system. Because of the large number of bunches in the LHC, coherent losses and multibunch instability rise times generated by the impedance items can be rather large. For example, the vacuum chambers of the main experiments can lead to large parasitic losses and a continuous feedback from the impedance calculations during their design process is desirable. We first summarise the current status of the impedance model for the LHC and estimate rise times and threshold currents for different instabilities. In a second step, we discuss possibilities of controlling these instabilities, using feedback systems and Landau damping. Abstract Single beam collective effects can limit the performance of the LHC and, together with parasitic losses, impose constraints on the design of the components of the LHC vacuum system. Because of the large number of bunches in the LHC, coherent losses and multibunch instability rise times generated by the impedance items can be rather large. For example, the vacuum chambers of the main experiments can lead to large parasitic losses and a continuous feedback from the impedance calculations during their design process is desirable. We first summarise the current status of the impedance model for the LHC and estimate rise times and threshold currents for different instabilities. In a second step, we discuss possibilities of controlling these instabilities, using feedback systems and Landau damping.

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“…At SLAC, a 25% reduction was seen after a dose of ~10 18 e/cm 2 (15 Ah equivalent in PEP-II) [4], and at CERN a dose of 10 -3 C/cm 2 reduced the Cu SEY to below 1.3, the critical value for multipacting [28]. Data with the APS Al chambers show that the SE-dominated signal was reduced by 45% after 62 A-h of stored beam.…”

Section: Discussionmentioning

confidence: 99%

Theory and measurement of the electron cloud effect

Harkay

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)

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Photoelectrons produced through the interaction of synchrotron radiation and the vacuum chamber walls can be accelerated by a charged particle beam, acquiring sufficient energy to produce secondary electrons (SEs) in collisions with the walls. If the secondary-electron yield (SEY) coefficient of the wall material is greater than one, a runaway condition can develop. In addition to the SEY, the degree of amplification depends on the beam intensity and temporal distribution. As the electron cloud builds up along a train of stored bunches, a transverse perturbation of the head bunch can be communicated to trailing bunches in a wakefield-like interaction with the cloud. The electron cloud effect is especially of concern for the high-intensity PEP-II (SLAC) and KEK B-factories and at the Large Hadron Collider (LHC) at CERN. An initiative was undertaken at the Advanced Photon Source (APS) storage ring to characterize the electron cloud in order to provide realistic limits on critical input parameters in the models and improve their predictive capabilities. An intensive research program was undertaken at CERN to address key issues relating to the LHC. After giving an overview, the recent theoretical and experimental results from the APS and the other laboratories will be discussed.

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On the Possibility of Observing Transverse Echos in RHIC

Cited by 4 publications

References 0 publications

WG7 Highlights - Future DIS Experiments

WG7 Highlights - Future DIS Experiments

Summary of the single-beam collective effects in the LHC

Theory and measurement of the electron cloud effect

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