Poster

With the upcoming High-Luminosity phase of the LHC, the CMS experiment is upgrading many of its subdetectors, notably the end-cap calorimeters. The High-Granularity Calorimeter (HGCAL) upgrade will completely replace the current electromagnetic and hadronic end-cap calorimeters with a radiation-hard, high granularity, silicon and SiPM-on-Tile sampling calorimeter. [...]

In plasma-based acceleration, an ultra-relativistic particle bunch - or an intense laser beam - is used to expel electrons from its propagation path, forming a wake that is devoid of electrons. The ions, being significantly more massive, are often assumed to be stationary. [...]

High-repetition-rate operation of plasma-wakefield accelerators is essential for their suitability in the design of colliders and FELs. Energy remaining in the plasma after the wakefield acceleration event can limit the ultimate repetition rate of the plasma accelerator as the plasma takes time to relax to its initial state. [...]

Electron-bunch-driven plasma-wakefield accelerators promise to revolutionise particle acceleration by providing compact and cost-effective energy boosters for electron linacs which could, for example, significantly enhance the photon energies produced by free-electron lasers. The FLASHForward facility at DESY has made substantial progress, demonstrating that accelerated electron bunches can maintain their charge, energy spread, and emittance during plasma acceleration. [...]

The linac of the European XFEL accelerates high-quality electron bunches up to a maximum of 17.5 GeV, which undergo free-electron lasing in undulators at photon energies of up to 30 keV. A plasma accelerator stage could be used to significantly increase the electron bunch energy of the European XFEL cheaply and over a short distance. [...]

We present studies of the b_bbar_4l (bb4l) package from the POWHEG BOX RES Monte Carlo generator, used to model top quark productions for the CMS experiment at the LHC. The bb4l package includes next-to-leading order matrix element calculations interfaced to parton shower for top quark pair production, the associated production of a single top quark with a W boson, their interferences, and the non-resonant production of two charged leptons, two neutrinos, and two b quarks. [...]

FLASHForward at DESY is a cutting-edge plasma wakefield accelerator (PWFA) facilitywhere electron beams from the FLASH linac are accelerated in plasmas with highaccelerating gradients of approximately 1 GV/m. The plasmas are created by high-voltagedischarges and are confined in sapphire capillaries. [...]

Twin electron bunches accelerated by high-energy linacs are attracting increasing interest especially in twin free-electron laser (FEL) pulse generation andbeam-driven plasma wakefield acceleration (PWFA) studies. High-energy linacs may benefit from plasma accelerators, where a trailing bunch is accelerated inGV/m fields in a plasma wave driven by the leading bunch. [...]

Plasma-wakefield acceleration (PWFA) promises to reduce the size of future machines significantly by providing multi-GeV/m acceleration gradients, orders of magnitude higher than conventional RF accelerators. However, PWFA is a process with many non-linear dependencies, making it difficult to understand the influence of input parameters. [...]

Plasma-based accelerators hold the potential to achieve mulit-giga-volt-per-metre accelerating gradients, offering a promising route to more compact and cost-effective accelerators for future light sources and colliders. However, plasma wakefield acceleration (PWFA) is often a nonlinear, high-dimensional process that is sensitive to jitters in multiple input parameters, making the setup, operation and diagnosis of a PWFA stage a challenging task. [...]