A5068860409- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Radiation Therapy and Dosimetry
- Laser-Plasma Interactions and Diagnostics
- Gyrotron and Vacuum Electronics Research
- Particle physics theoretical and experimental studies
- Plasma Diagnostics and Applications
- Laser-induced spectroscopy and plasma
- Radiation Detection and Scintillator Technologies
- Distributed and Parallel Computing Systems
- Radiation Effects in Electronics
- Advanced Radiotherapy Techniques
- Nuclear Physics and Applications
- Graphite, nuclear technology, radiation studies
- Magnetic confinement fusion research
- Electrostatic Discharge in Electronics
- Advanced Data Storage Technologies
- Scientific Computing and Data Management
- Atomic and Molecular Physics
- Algorithms and Data Compression
- Real-time simulation and control systems
- Optical Systems and Laser Technology
- Rock Mechanics and Modeling
University of Oslo
2012-2023
European Organization for Nuclear Research
2015-2021
Ulsan National Institute of Science and Technology
2021
Cockcroft Institute
2019
Daresbury Laboratory
2019
Lancaster University
2019
Active plasma lensing is a compact technology for strong focusing of charged particle beams, which has gained considerable interest use in novel accelerator schemes. While providing $\mathrm{kT}/\mathrm{m}$ gradients, active lenses can have aberrations caused by radially nonuniform temperature profile, leading to degradation the beam quality. We present first direct measurement this aberration, consistent with theory, and show that it be fully suppressed changing from light gas species...
Abstract Very high energy electron (VHEE) beams have been proposed as an alternative radiotherapy modality to megavoltage photons; they penetrate deeply without significant scattering in inhomogeneous tissue because of their relativistic inertia. However, the depth dose distribution a single, collimated VHEE beam is quasi-uniform, which can lead healthy being overexposed. This be largely overcome by focusing small spot. Here, we present experiments demonstrate means concentrating into...
Abstract Understanding plasma initiation in vacuum arc discharges can help to bridge the gap between nano‐scale triggering phenomena and macroscopic surface damage caused by arcs. We present a new twodimensional particle‐in‐cell tool simulate direct‐current (DC) copper starting from single, strong field emitter at cathode. Our simulations describe detail how sub‐micron emission site evolve discharge, provide possible explanation for why cathode spots spread on surface. Furthermore, model...
The HALHF collaboration has discussed a new baseline for the project, taking into account comments from accelerator community on various aspects of original design. In particular, these concerned practicality dual-purpose linac to accelerate both colliding positron bunches and drive beams required plasma linac. addition, many other project were also considered; discussion conclusions are documented in this paper. Finally, is outlined that been optimised addresses several weaknesses design,...
Abstract As part of the Snowmass'21 community planning excercise, Advanced Accelerator Concepts (AAC) proposed future linear colliders with center-of-mass energies up to 15 TeV and luminosities 50 × 10 34 cm -2 s -1 in a compact footprint. In addition being compact, these machines must also be energy efficient. We identify two challenges that addressed design machines. First, Beam Delivery System (BDS) not add significant length accelerator complex. Second, beam parameters chosen mitigate...
Abstract The LHC@Home BOINC project has provided computing capacity for numerical simulations to researchers at CERN since 2004, and 2011 been expanded with a wider range of applications. traditional accelerator physics simulation code SixTrack enjoys continuing volunteers support, thanks virtualisation number applications from the LHC experiment collaborations particle theory groups have joined consolidated project. This paper addresses challenges related virtualized in environment, how...
The CERN Linear Electron Accelerator for Research (CLEAR) has now finished its second year of operation, providing a testbed new accelerator technologies and versatile radiation source. Hosting varied experimental program, this beamline provides flexible test facility users both internal external to CERN, as well being an excellent physics training ground. energy can be between 60 220 MeV, bunch length 1 4 ps, charge in the range 10 pC 2 nC, number bunches 200, at repetition rate 0.8 Hz....
Abstract The Beam Delivery System (BDS) is a critical component of high-energy linear collider. It transports the beam from accelerator and brings it to focus at Interaction Point. BDS system includes diagnostic sections for measuring energy, emittance, polarization, as well collimators machine protection. length increases with collision energy. Higher energies also require higher luminosities, this significant constraint on design energy-frontier machines. Here, we review designs based...
Abstract A method to monitor the length of a particle bunch, based on combination Radio Frequency Deflector (RFD) with magnetic focusing elements, is presented. With respect state-of-the-art bunch measurement, additional element allows measure also correlations between longitudinal and transverse planes in terms both position divergence. Furthermore, quadrupole-based increases input dynamic range measurement system (i.e. for larger beam Twiss parameters at entrance RFD). Thus, resolution...
Active plasma lenses are compact devices developed as a promising beam-focusing alternative for charged particle beams, capable of short focal lengths high-energy beams. We have previously shown that linear magnetic fields with gradients around 0.3 kT/m can be achieved in argon-filled preserve beam emittance [C.A. Lindstr\o{}m et al., Phys. Rev. Lett. 121, 194801 (2018)]. Here we show argon $500\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$ diameter capillary, the still focusing gradient 3.6...
The new CERN Linear Electron Accelerator for Research (CLEAR) facility at started its operation in fall 2017. CLEAR results from the conversion of CALIFES beam line former CLIC Test Facility (CTF3) into a testbed general accelerator R&D and component studies existing possible future applications. can provide stable reliable electron 60 to 220 MeV single or multi bunch configuration 1.5 GHz. experimental program includes high gradient acceleration methods, e.g. X-band plasma technology,...
SixTrack is a single-particle tracking code for high-energy circular accelerators routinely used at CERN the Large Hadron Collider (LHC), its luminosity upgrade (HL-LHC), Future Circular (FCC) and Super Proton Synchrotron (SPS) simulations. The based on 6D symplectic engine, which optimized long-term simulations delivers fully reproducible results several platforms. It also includes multiple scattering engines beam–matter interaction studies, as well facilities to run integrated with...
A good knowledge of the effects crab cavities, required for baseline High Luminosity LHC (HL-LHC), is needed before results first tests cavity prototypes in SPS, planned 2018, will be available. In case failures, we have to make sure that time scales are long enough so beams can cleanly dumped damage by beam loss occurs. We discuss our present and modeling induced losses, combined with mechanical deformation. lower limits on safe operation, possible failure mitigation methods.
The main objective of radiotherapy is to exploit the curative potential ionizing radiation while inflicting minimal radiation-induced damage healthy tissue and sensitive organs. Proton beam therapy has been developed irradiate tumor with higher precision dose conformity compared conventional X-ray irradiation. this treatment modality may be further improved if narrower proton beams are used. Still, limited by multiple Coulomb scattering protons through tissue. primary aim work was develop...
The SixTrack particle tracking code is routinely used to simulate trajectories in high energy circular machines like the LHC and FCC, deployed for massive simulation campaigns on CERN clusters BOINC platform within LHC@Home volunteering computing project. 2017 release brings many upgrades that improve flexibility, performance, accuracy. This paper describes new modules wire- electron lenses (WIRE ELEN), expert interface beam-beam element (BEAM/EXPERT), extension of number simultaneously...