HB2018 - List of Authors (Stancari, G.)

Paper	Title	Page
TUP1WE02	Hollow Electron-Lens Assisted Collimation and Plans for the LHC	92
	D. Mirarchi, H. Garcia Morales, A. Mereghetti, S. Redaelli, J.F. Wagner CERN, Geneva, Switzerland W. Fischer, X. Gu BNL, Upton, Long Island, New York, USA H. Garcia Morales Royal Holloway, University of London, Surrey, United Kingdom D. Mirarchi The University of Manchester, The Photon Science Institute, Manchester, United Kingdom G. Stancari Fermilab, Batavia, Illinois, USA J.F. Wagner IAP, Frankfurt am Main, Germany
	The hollow electron lens (e-lens) is a very powerful and advanced tool for active control of diffusion speed of halo particles in hadron colliders. Thus, it can be used for a controlled depletion of beam tails and enhanced beam halo collimation. This is of particular interest in view of the upgrade of the Large Hadron Collider (LHC) at CERN, in the framework of the High-Luminosity LHC project (HL-LHC). The estimated stored energy in the tails of the HL-LHC beams is about 30 MJ, posing serious constraints on its control and safe disposal. In particular, orbit jitter can cause significant loss spikes on primary collimators, which can lead to accidental beam bump and magnet quench. Successful tests of e-lens assisted collimation have been carried out at the Tevatron collider at Fermilab and a review of the main outcomes is shown. Preliminary results of recent experiments performed at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven, put in place to explore different operational scenarios studies for the HL-LHC, are also discussed. Status and plans for the deployment of hollow electron lenses at the HL-LHC are presented.
	Slides TUP1WE02 [29.382 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUP1WE02
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WEA2WA04	Space-Charge Compensation Using Electron Columns at IOTA	247
	B.T. Freemire Northern Illinois University, DeKalb, Illinois, USA S. Chattopadhyay Northern Illinois Univerity, DeKalb, Illinois, USA M. Chung UNIST, Ulsan, Republic of Korea C.S. Park, V.D. Shiltsev, G. Stancari Fermilab, Batavia, Illinois, USA G. Penn LBNL, Berkeley, California, USA
	Funding: US Department of Energy contracts DE-AC02-07CH11359 and DE-AC02-05CH1123 and the GARD Program. Beam loss due to space charge is a major problem at current and future high intensity particle accelerators. The space charge force can be compensated for proton or ion beams by creating a column of electrons with a charge distribution matched to that of the beam, maintaining electron-proton stability. The column is created by the beam ionizing short sections of high pressure gas. The ionization electrons are then shaped appropriately using electric and magnetic fields. The Integrable Optics Test Accelerator (IOTA) at Fermilab is a test bed for beam loss and instability mitigation techniques. Simulations using the particle-in-cell code, Warp, have been made to track the evolution of both the electron column and the beam over multiple passes. A 2.5 MeV proton beamline is under construction at IOTA, to be used to study the effect of the electron column on a space charge dominated beam.
	Slides WEA2WA04 [8.501 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEA2WA04
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Hollow Electron-Lens Assisted Collimation and Plans for the LHC

92

D. Mirarchi, H. Garcia Morales, A. Mereghetti, S. Redaelli, J.F. Wagner
CERN, Geneva, Switzerland
W. Fischer, X. Gu
BNL, Upton, Long Island, New York, USA
H. Garcia Morales
Royal Holloway, University of London, Surrey, United Kingdom
D. Mirarchi
The University of Manchester, The Photon Science Institute, Manchester, United Kingdom
G. Stancari
Fermilab, Batavia, Illinois, USA
J.F. Wagner
IAP, Frankfurt am Main, Germany

The hollow electron lens (e-lens) is a very powerful and advanced tool for active control of diffusion speed of halo particles in hadron colliders. Thus, it can be used for a controlled depletion of beam tails and enhanced beam halo collimation. This is of particular interest in view of the upgrade of the Large Hadron Collider (LHC) at CERN, in the framework of the High-Luminosity LHC project (HL-LHC). The estimated stored energy in the tails of the HL-LHC beams is about 30 MJ, posing serious constraints on its control and safe disposal. In particular, orbit jitter can cause significant loss spikes on primary collimators, which can lead to accidental beam bump and magnet quench. Successful tests of e-lens assisted collimation have been carried out at the Tevatron collider at Fermilab and a review of the main outcomes is shown. Preliminary results of recent experiments performed at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven, put in place to explore different operational scenarios studies for the HL-LHC, are also discussed. Status and plans for the deployment of hollow electron lenses at the HL-LHC are presented.

Slides TUP1WE02 [29.382 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUP1WE02

Export •

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

WEA2WA04

Space-Charge Compensation Using Electron Columns at IOTA

247

B.T. Freemire
Northern Illinois University, DeKalb, Illinois, USA
S. Chattopadhyay
Northern Illinois Univerity, DeKalb, Illinois, USA
M. Chung
UNIST, Ulsan, Republic of Korea
C.S. Park, V.D. Shiltsev, G. Stancari
Fermilab, Batavia, Illinois, USA
G. Penn
LBNL, Berkeley, California, USA

Funding: US Department of Energy contracts DE-AC02-07CH11359 and DE-AC02-05CH1123 and the GARD Program.
Beam loss due to space charge is a major problem at current and future high intensity particle accelerators. The space charge force can be compensated for proton or ion beams by creating a column of electrons with a charge distribution matched to that of the beam, maintaining electron-proton stability. The column is created by the beam ionizing short sections of high pressure gas. The ionization electrons are then shaped appropriately using electric and magnetic fields. The Integrable Optics Test Accelerator (IOTA) at Fermilab is a test bed for beam loss and instability mitigation techniques. Simulations using the particle-in-cell code, Warp, have been made to track the evolution of both the electron column and the beam over multiple passes. A 2.5 MeV proton beamline is under construction at IOTA, to be used to study the effect of the electron column on a space charge dominated beam.

Slides WEA2WA04 [8.501 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEA2WA04

Export •

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