HB2018 - List of Authors (Papaphilippou, Y.)

Paper	Title	Page
WEP1WA02	Beam-Beam Studies in Present and Future Hadron Colliders
	Y. Papaphilippou CERN, Geneva, Switzerland
	The impact on beam-beam effects in the non-linear dynamics of colliding hadron beams is reviewed, with emphasis on simulation and measurement examples from the LHC and its High-Luminosity upgrade (HL-LHC). The main limitation encountered is the effect of the beam-beam long range (BBLR) interaction which limits the beam lifetime at collision and is well correlated with the minimum dynamic aperture (DA), as shown by measurements in the LHC. Thereby, multi-parametric DA simulations are used as a guide in order to define the collider settings and beam parameters through the LHC run. The same approach is used for validating the operational HL-LHC scenario and improving the beam performance at collision. Recent studies on the impact of tune modulation to the collider lifetime are briefly described. Finally, the potential of BBLR compensation in the HL-LHC era is evaluated through simulations and LHC machine studies.
	Slides WEP1WA02 [6.355 MB]
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WEP2PO008	SPS Long Term Stability Studies in the Presence of Crab Cavities and High Order Multipoles	284
	A. Alekou, H. Bartosik, R. Calaga, M. Carlà, Y. Papaphilippou CERN, Geneva, Switzerland R.B. Appleby, R.B. Appleby UMAN, Manchester, United Kingdom R.B. Appleby Cockcroft Institute, Warrington, Cheshire, United Kingdom
	A local Crab Cavity (CC) scheme will recover the head-on collisions at the IP of the High Luminosity LHC (HL-LHC), which aims to increase the LHC luminosity by a factor of 3-10. The tight space constraints at the CC location result in axially non-symmetric cavity designs that introduce high order multipole CC components. The impact of these high order components on the long term stability of the beam in the SPS machine, where two prototype crab cavities are presently installed in the CERN SPS to perform tests with beam, is presented. Furthermore, the Dynamic Aperture is studied in the presence of the SPS errors. Future plans are discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEP2PO008
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

WEP1WA02

Beam-Beam Studies in Present and Future Hadron Colliders

Y. Papaphilippou
CERN, Geneva, Switzerland

The impact on beam-beam effects in the non-linear dynamics of colliding hadron beams is reviewed, with emphasis on simulation and measurement examples from the LHC and its High-Luminosity upgrade (HL-LHC). The main limitation encountered is the effect of the beam-beam long range (BBLR) interaction which limits the beam lifetime at collision and is well correlated with the minimum dynamic aperture (DA), as shown by measurements in the LHC. Thereby, multi-parametric DA simulations are used as a guide in order to define the collider settings and beam parameters through the LHC run. The same approach is used for validating the operational HL-LHC scenario and improving the beam performance at collision. Recent studies on the impact of tune modulation to the collider lifetime are briefly described. Finally, the potential of BBLR compensation in the HL-LHC era is evaluated through simulations and LHC machine studies.

Slides WEP1WA02 [6.355 MB]

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEP2PO008

SPS Long Term Stability Studies in the Presence of Crab Cavities and High Order Multipoles

284

A. Alekou, H. Bartosik, R. Calaga, M. Carlà, Y. Papaphilippou
CERN, Geneva, Switzerland
R.B. Appleby, R.B. Appleby
UMAN, Manchester, United Kingdom
R.B. Appleby
Cockcroft Institute, Warrington, Cheshire, United Kingdom

A local Crab Cavity (CC) scheme will recover the head-on collisions at the IP of the High Luminosity LHC (HL-LHC), which aims to increase the LHC luminosity by a factor of 3-10. The tight space constraints at the CC location result in axially non-symmetric cavity designs that introduce high order multipole CC components. The impact of these high order components on the long term stability of the beam in the SPS machine, where two prototype crab cavities are presently installed in the CERN SPS to perform tests with beam, is presented. Furthermore, the Dynamic Aperture is studied in the presence of the SPS errors. Future plans are discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEP2PO008

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)