Joint Accelerator Performance Workshop 2024

Session

Beam dynamics modelling <-> Operation

11 Dec 2024, 11:25

Royal Plaza Montreux & Spa

Conveners

Beam dynamics modelling <-> Operation

• Foteini Asvesta (CERN)
• Daniele Mirarchi (CERN)

20. Fixed target beams and challenges for the future (15'+10')

Pablo Arrutia (CERN)

11/12/2024, 11:25

Prospect of running ISOLDE with higher intensity per shot in 2025 in view of future proton sharing, and status of upgrade project
Higher intensity for TOF
Fixed-target beams: bunch length/momentum spread/beam size (PSB, PS), spill quality (PS/SPS), losses
Higher intensity requests for North-Area post-LS3 + Beamline acceptance.
Beam for BDF/SHiP and intensity increase to 7e13, future beam...

24. Ions: overview and outlook accross the complex (20'+10')

Maciej Slupecki (CERN)

11/12/2024, 11:50

Overview 2024
LHC oxygen run in 2025
Development for future ions after LS3
Status of the source and LINAC3 accelerator model
ALICE background and crystals stability
Beam quality in the injectors, in particular LEIR and SPS (issue in 2023). What should be improved or done differently?

21. Beam quality preservation for LHC beams (20'+10')

Sofia Kostoglou (CERN)

11/12/2024, 12:20

Emittance growth and tail generation along the chain: mechanism, mitigation, and impact in LHC itself; influence of PS transition, transfer lines matching, degradation beyond burn-off.
Losses in PS-to-SPS, SPS, and at LHC injection: why is the situation improved in 2024? (blindable BLMs to be commissioned if long trains?)
Optimization of LHC2025 filling scheme in terms of filling time / beam...

22. Collimation aspects in the LHC and SPS (15'+10)

Frederik Van Der Veken (CERN)

11/12/2024, 14:10

Phase knob, collimator hierarchy breakage, DA simulations: how models feed into operation settings (theoretical modelling, simulations and understanding)
Tail population from scraping (EoF + MD), LRBB wire compensator effect on tail population, …
Beam studies towards a dedicated SPS collimation system

23. Optics aspects in the accelerator complex (20'+10')

Felix Simon Carlier (CERN)

11/12/2024, 14:35

LEIR - progress / challenges to optics measurement (tools, BPMs, lack of good models)
PS - zero dispersion optics to improve emittance measurement, deconvolution tests, comment on viability to other machines if progress made
LHC - general status of optics studies - what is standard vs expert. What developments of tools are needed.
LHC - AC-dipole status - critical spares.
LHC commissioning...

25. LHC: issues, mitigations (15'+10')

Andrea Calia (CERN)

11/12/2024, 15:05

LHC collimator hierarchy breakage operational response, mitigations
FASER/SND background, cures, compatibility with RP optics
LHC aperture: measurements and performance (beta*/xing angle) reach
Intensity limits at LHC from RF vacuum modules - can we unlock for 2025? RF fingers and bunch intensity limitation? (just a slide on long. Bunch. Control over ramp)

26. LHC: configuration 2025/26, intensity ramp-up, polarity reversal, optics (20'+10')

Xavier Buffat (CERN)

11/12/2024, 15:30

RP optics, crossing planes, flat optics, consider the use of flat optics either for necessity in the HV crossing configuration or for performance in the current VH configuration (e.g. 30/20cm). Further improvements: reducing the xing angle at the end of leveling? + wire …?
E-cloud modelling and heat-load in cold magnets (only impact on performance 2025-HL, confirmed trend from previous...

45. Session 2/3 discussion session

Cedric Hernalsteens (CERN), Daniele Mirarchi (CERN), Foteini Asvesta (CERN), Helga Timko (CERN)

11/12/2024, 16:00