Gas-filled capillaries for plasma-based accelerators

8th International Particle Accelerator Conference

Filippi, F.^1 ; Anania, M.P.^1 ; Brentegani, E.^1 ; Biagioni, A.^1 ; Cianchi, A.^2 ; Chiadroni, E.^1 ; Ferrario, M.^1 ; Pompili, R.^1 ; Romeo, S.^1 ; Zigler, A.^3

Laboratori Nazionali di Frascati, INFN, Frascati, Italy^1

Dipartimento di Fisica, Universit di Roma Tor Vergata, Roma, Italy^2

Hebrew University of Jerusalem, Jerusalem, Israel^3

关键词: Accelerated particles;    Accelerating gradient;    Gas filled capillary plasma;    Gas-filled capillaries;    Plasma density distributions;    Plasma wake-field accelerators;    Plasma-based accelerators;    Temporal and spatial evolutions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/874/1/012036/pdf
DOI  :  10.1088/1742-6596/874/1/012036

来源: IOP

【 摘 要 】

Plasma Wakefield Accelerators are based on the excitation of large amplitude plasma waves excited by either a laser or a particle driver beam. The amplitude of the waves, as well as their spatial dimensions and the consequent accelerating gradient depend strongly on the background electron density along the path of the accelerated particles. The process needs stable and reliable plasma sources, whose density profile must be controlled and properly engineered to ensure the appropriate accelerating mechanism. Plasma confinement inside gas filled capillaries have been studied in the past since this technique allows to control the evolution of the plasma, ensuring a stable and repeatable plasma density distribution during the interaction with the drivers. Moreover, in a gas filled capillary plasma can be pre-ionized by a current discharge to avoid ionization losses. Different capillary geometries have been studied to allow the proper temporal and spatial evolution of the plasma along the acceleration length. Results of this analysis obtained by varying the length and the number of gas inlets will be presented.