Space Charge 2026, 7th ICFA BD Mini-workshop

Session

C

C

30 Sept 2026, 13:30

Denys Wilkinson Building, Dennis Sciama Lecture Theatre (Oxford University, Physics Department)

Conveners

C: Resonances and Space Charge

• Giuliano Franchetti

C: Instabilities and Space Charge

• Adrian Oeftiger (University of Oxford)

C: New Concepts

• Elias Metral (CERN)

Description

Open Topics in Space-Charge Beam Physics

75. Lead talk: Resonances and Space Charge

Giuliano Franchetti

30/09/2026, 13:30

C-1. Resonances and Space Charge

64. Resonance Studies in the SPS for High-Brightness Beams.

Ingrid Mases Sole (CERN)

30/09/2026, 13:50

C-1. Resonances and Space Charge

Space charge effects in combination with betatron resonances limit the performance of high-brightness LHC beams in the CERN Super Proton Synchrotron (SPS). Here we report on experimental studies performed with single-bunch proton beams, monitoring transverse emittance evolution and particle losses while performing tune scans across the horizontal and vertical planes. Two significant resonances...

42. Study of beam redistribution on approach to the half integer resonance with space charge and the implications for ISIS RCS operations

Chris Warsop

30/09/2026, 14:05

C-1. Resonances and Space Charge

The half integer resonance is a potential cause of significant emittance growth, beam loss, and thus a possible performance limitation on high intensity hadron rings. Of key importance is the transverse redistribution of the beam with space charge, as it approaches resonance (in most cases from above). The behaviour is a combination of both coherent and incoherent effects whose relative...

37. Space charge simulation for the third order resonance corrections at J-PARC MR

Susumu Igarashi (High Energy Accelerator Research Organization (KEK))

30/09/2026, 14:20

C-1. Resonances and Space Charge

Third order resonances of 3νx=64 and νx+2νy=64 have been corrected for the high intensity operation of the main ring (MR) of the Japan Proton Accelerator Research Complex (J-PARC). The cause of the third order resonances would be error magnetic fields of the sextupole components. The resonances are corrected using the trim coils of the sextupole magnets and the beam loss in the operation are...

22. Space Charge Effects in a Ring-Based Electron Cooler

Sergey Seletskiy

30/09/2026, 14:35

C-1. Resonances and Space Charge

Electron cooling can be extended to highly relativistic energies by employing non-magnetized, RF-based electron coolers. An example of such a cooler is the Ring Electron Cooler (REC), which has been proposed to improve the average luminosity of the Electron Ion Collider at collision energy. The REC is a high-current electron storage ring operating at a relativistic gamma of 294, with beam...

76. Discussion Session C-1

Giuliano Franchetti

30/09/2026, 14:50

81. Lead talk: Instabilities and Space Charge

Adrian Oeftiger (University of Oxford)

01/10/2026, 10:45

C-2. Instabilities and Space Charge

Lead talk of session C-1.

Space Charge: Friend or Foe of Transverse Coherent Stability?

Transverse coherent stability of bunches is a key factor in the performance of high-intensity accelerators. As the brightness frontier is pushed further, space charge plays an increasingly important -- and seemingly contradictory -- role, both modifying and driving collective instabilities as well as...

9. Effects of space charge near transition energy of the CERN PS

Miltiadis Bozatzis (Goethe University Frankfurt (DE))

01/10/2026, 11:05

C-2. Instabilities and Space Charge

The CERN Proton Synchrotron (PS) accelerates proton and ion beams over such an energy range that the transition energy is crossed in normal operation. Recent studies, motivated by the growing demand for high‑intensity proton beams for fixed‑target experiments, have revealed potential operational limitations in this region. The observed dependence of beam losses and transverse mean‑position...

44. Space charge studies at a fourth-generation light source SOLEIL II

Vadim Gubaidulin (Synchrotron SOLEIL)

01/10/2026, 11:20

C-2. Instabilities and Space Charge

Many synchrotron light sources are in the stage of an upgrade to new-generation accelerators. These upgrades typically aim to reduce the transverse emittances by one or two orders of magnitude. Horizontal and vertical beta-functions are also smaller to further reduce the beam size at source points. At the same time, the beam energy typically remains unchanged. In these conditions, effects...

41. Space-charge effects during operation with Landau octupoles: coherent damping and single-particle stability

Vladimir Kornilov (GSI Helmholtzzentrum für Schwerionenforschung GmbH)

01/10/2026, 11:35

C-2. Instabilities and Space Charge

The use of octupole magnets for Landau damping of transverse instabilities in synchrotrons must be carefully balanced against requirements of the coherent and single-particle stability. The octupoles should provide sufficient damping to suppress the instabilities while fulfilling the dynamic aperture constrains. In beams with a space-charge dominated tune footprint, all these beam dynamics...

82. Mitigation of Proton Beam Instabilities under Strong Space Charge

David Posthuma de Boer

01/10/2026, 11:50

83. Discussion Session C-2

Adrian Oeftiger (University of Oxford)

01/10/2026, 12:05

Discussion contributions:

• Elias Métral on "Bunched-beam transverse coherent direct space charge modes"

90. Lead talk: New Concepts

Elias Metral (CERN)

02/10/2026, 15:30

Lead talk session C-3.

6. Simulation of Crystalline Beams in the BNL Booster

Stephen Brooks (BNL)

02/10/2026, 15:50

C-3. New Concepts

A method has been developed to match large three-dimensional Coulomb crystals into existing accelerators. These crystals exist at the space charge limit and have close to zero emittance. Simulations show bunch temperatures below 0.03 Kelvin persisting for 5500 turns in the BNL Booster lattice with modified magnet settings. This optics solution exploits the 'vortex effect' first seen in...

5. Space-Charge Impedance in Material-Filled Beam Regions for Ionization Cooling in a Future Muon Collider

Erik Kvikne (University of Oslo (NO))

02/10/2026, 16:05

C-3. New Concepts

Space-charge effects in material-filled beam regions are relevant for ionization cooling in a future muon collider, where low-$Z$ absorbers are used to reduce the beam emittance. We extend the conventional cylindrical space-charge impedance formalism to the case of a beam region filled with a material of arbitrary electromagnetic properties and surrounded by a perfectly conducting boundary....

70. Space Charge effects in the muon cooling section with RF-track

Bernd Michael Stechuner (CERN)

02/10/2026, 16:20

C-3. New Concepts

Multi-TeV muon colliders are promising machines for precision studies of the Standard Model (SM) of particle physics and for probing potential physics beyond the SM. In the proposed muon production scheme, muons are generated from pion decays, resulting in beams with very large phase-space volumes that must be reduced through ionization cooling.
During ionization cooling, muons reach the...

58. Simulation Studies of Space Charge Effects in the 6D Rectilinear Muon Cooling Channel

Dr Ruihu Zhu (IMP)

02/10/2026, 16:35

C-3. New Concepts

Six-dimensional muon cooling is essential for reducing the beam emittance to the level required for a high-luminosity muon collider. To investigate possible collective effects in such high-brightness muon beams, a new space charge module has been implemented in G4beamline and recently improved for simulations of muon cooling channels. The module has been assessed through benchmark,...

91. Discussion Session C-3

Elias Metral (CERN)

02/10/2026, 16:50