Transmission efficiency measurement at the FNAL 4-rod RFQ
  This paper presents measurements of the beam transmission performed on the 4-rod RFQ currently under operation at Fermilab. The beam current has been measured at the RFQ exit as a function of the magnetic field strength in the two LEBT solenoids. This measurement is compared with scans performed on the FermiGrid with the beam dynamics code TRACK. A particular attention is given to the impact, on the RFQ beam transmission, of the space-charge neutralization in the LEBT. 
J.-P. Carneiro, F.G. Garcia, J.-F Ostiguy, A. Saini, R. Zwaska   (Fermilab) B. Mustapha, P. Ostroumov (Argonne)
physics.acc-ph