Grigoriadis_et_al_Appl. Phys. Lett._118(13)_2021.pdfhttp://purl.tuc.gr/dl/dias/FAE2B731-E3AC-4474-94BD-2933BA17EA0CBetatron-type laser-plasma x-ray sources generated in multi-electron gas targetsfree2023-01-12application/pdf1.5 MB