title: Linac4 low energy beam measurements with negative hydrogen ions.
abstract: Linac4, a 160 MeV normal-conducting H(-) linear accelerator, is the first step in the upgrade of the beam intensity available from the LHC proton injectors at CERN. The Linac4 Low Energy Beam Transport (LEBT) line from the pulsed 2 MHz RF driven ion source, to the 352 MHz RFQ (Radiofrequency Quadrupole) has been built and installed at a test stand, and has been used to transport and match to the RFQ a pulsed 14 mA H(-) beam at 45 keV. A temporary slit-and-grid emittance measurement system has been put in place to characterize the beam delivered to the RFQ. In this paper a description of the LEBT and its beam diagnostics is given, and the results of beam emittance measurements and beam transmission measurements through the RFQ are compared with the expectation from simulations.
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: R
authors.initials: R
authors.lastname: Scrivens
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: G
authors.initials: G
authors.lastname: Bellodi
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: O
authors.initials: O
authors.lastname: Crettiez
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: V
authors.initials: V
authors.lastname: Dimov
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: D
authors.initials: D
authors.lastname: Gerard
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: E
authors.initials: E
authors.lastname: Granemann Souza
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: R
authors.initials: R
authors.lastname: Guida
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: J
authors.initials: J
authors.lastname: Hansen
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: J-B
authors.initials: JB
authors.lastname: Lallement
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: J
authors.initials: J
authors.lastname: Lettry
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Lombardi
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: Ø
authors.initials: Ø
authors.lastname: Midttun
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: C
authors.initials: C
authors.lastname: Pasquino
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: U
authors.initials: U
authors.lastname: Raich
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: B
authors.initials: B
authors.lastname: Riffaud
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: F
authors.initials: F
authors.lastname: Roncarolo
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: C A
authors.initials: CA
authors.lastname: Valerio-Lizarraga
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: J
authors.initials: J
authors.lastname: Wallner
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Yarmohammadi Satri
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: T
authors.initials: T
authors.lastname: Zickler