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| Paper IPM / Particles / 14065 |
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CERN Linac4 is made of a 3 MeV front end including
a 45 keV source , a 3 MeV Radio Frequency Quadrupole
(RFQ) and a fast chopper, followed by a 50 MeV Drift
Tube Linac (DTL), a 100 MeV Cell-Coupled Drift Tube
Linac (CCDTL) and a 160 MeV Pi-Mode Structure
(PIMS). The Linac4 beam commissioning is performed in
6 stages of increasing energy. Movable beam diagnostics
benches, with various instruments, are used at each step to
allow the detailed characterisation of operational
parameters that will play a key role in the overall future
performance. The first three stages of the commissioning,
up to 12 MeV beam energy, have been completed at the
end of 2014. The RFQ and the chopper line at 3 MeV, as
well as the first tank of the DTL at 12 MeV were fully
characterised, using permanent diagnostic instruments
and a movable diagnostic bench equipped with a
spectrometer, a slit-grid emittance meter, a Bunch Shape
Monitor, Beam Position Monitors and a laser-emittance
device. This paper reports on the strategy and the results
of the commissioning up to 12 MeV. It also presents the
validation of the set-up strategy, which is essential for the next stages of commissioning
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