title: Linac4 H⁻ ion sources.
abstract: CERN's 160 MeV H(-) linear accelerator (Linac4) is a key constituent of the injector chain upgrade of the Large Hadron Collider that is being installed and commissioned. A cesiated surface ion source prototype is being tested and has delivered a beam intensity of 45 mA within an emittance of 0.3 π ⋅ mm ⋅ mrad. The optimum ratio of the co-extracted electron- to ion-current is below 1 and the best production efficiency, defined as the ratio of the beam current to the 2 MHz RF-power transmitted to the plasma, reached 1.1 mA/kW. The H(-) source prototype and the first tests of the new ion source optics, electron-dump, and front end developed to minimize the beam emittance are presented. A temperature regulated magnetron H(-) source developed by the Brookhaven National Laboratory was built at CERN. The first tests of the magnetron operated at 0.8 Hz repetition rate are described.
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: J
authors.initials: J
authors.lastname: Lettry
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: D
authors.initials: D
authors.lastname: Aguglia
authors.affiliation: Brookhaven National Laboratory, BNL-CA, Upton, New York 11973, USA.
authors.forename: J
authors.initials: J
authors.lastname: Alessi
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: P
authors.initials: P
authors.lastname: Andersson
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: S
authors.initials: S
authors.lastname: Bertolo
authors.affiliation: AG Experimentelle Plasmaphysik, Universität Augsburg, 86135 Augsburg, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Briefi
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Butterworth
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: Y
authors.initials: Y
authors.lastname: Coutron
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Dallocchio
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: N
authors.initials: N
authors.lastname: David
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: E
authors.initials: E
authors.lastname: Chaudet
authors.affiliation: RAL, Harwell Oxford, Didcot OX11 0QX, United Kingdom.
authors.forename: D
authors.initials: D
authors.lastname: Faircloth
authors.affiliation: AG Experimentelle Plasmaphysik, Universität Augsburg, 86135 Augsburg, Germany.
authors.forename: U
authors.initials: U
authors.lastname: Fantz
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: D A
authors.initials: DA
authors.lastname: Fink
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Garlasche
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Grudiev
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: R
authors.initials: R
authors.lastname: Guida
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: J
authors.initials: J
authors.lastname: Hansen
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Haase
authors.affiliation: Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Hatayama
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Jones
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: I
authors.initials: I
authors.lastname: Koszar
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: J-B
authors.initials: JB
authors.lastname: Lallement
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: A M
authors.initials: AM
authors.lastname: Lombardi
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: C
authors.initials: C
authors.lastname: Machado
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: C
authors.initials: C
authors.lastname: Mastrostefano
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: S
authors.initials: S
authors.lastname: Mathot
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: S
authors.initials: S
authors.lastname: Mattei
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: P
authors.initials: P
authors.lastname: Moyret
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: D
authors.initials: D
authors.lastname: Nisbet
authors.affiliation: Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Nishida
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: O'Neil
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Paoluzzi
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: R
authors.initials: R
authors.lastname: Scrivens
authors.affiliation: Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Shibata
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: D
authors.initials: D
authors.lastname: Steyaert
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: N
authors.initials: N
authors.lastname: Thaus
authors.affiliation: CERN-ABP, 1211 Geneva 23, Switzerland.
authors.forename: G
authors.initials: G
authors.lastname: Voulgarakis