The　Large　Hadron　Collider　(LHC)　is　the　world　largest　and　most　powerful　accelerator　for　high　energy　physics.　The　High　Luminosity　LHC　project　(HL-　LHC)　foresees　the　construction　and　installation　of　important　upgrades　to　increase　the　efficiency　of　the　LHC　machine.　Hollow　Electron　Lenses　(HEL)　are　one　of　the　most　promising　methods　being　considered　to　control　the　beam　halo　and　to　improve　the　beam　collimation　system　for　HL-LHC.　The　source　of　the　HEL　is　an　annular　shaped　cathode　which　delivers　a　total　current　up　to　5A.　We　developed　a　nano-sized　Scandia　doped　dispenser　cathode　much　smaller　in　size　than　the　previously　used　B-type　dispenser　cathodes.　The　tests　demonstrated　that　this　cathode　fulfils　the　specifications　and　can　supply　5A　full　Space　Charge　Limited　(SCL)　current　at　a　true　temperature　of　about　850°C.　©　2018　IEEE.