“School of Particles”
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| Paper IPM / Particles / 15778 |
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The CERN LINAC4 is part of the LHC injector upgrade. It accelerates H- ions with a peak current of 62 mA up to 160 MeV in an 80 m long accelerator housed in a tunnel 12 m underground. The LINAC4 successively consists of a 45 keV rf volume ion source, a two-solenoid low energy beam transport (LEBT), a 352/2 MHz radio-frequency quadrupole (RFQ) accelerating the beam to 3 MeV, a medium energy beam transport (MEBT) line, a 50 MeV FFDD periodic lattice drift tube linac (three DTL tanks), a 100 MeV FODO periodic structure cell-coupled drift tube linac (CCDTL), and a FODO periodic lattice pi-mode structure (PIMS) bringing the beam to the final energy of 160 MeV. The MEBT is shown in Fig. 1. The machine is equipped with various temporary and permanent diagnostic tools to monitor the performance over its entire length. The temporary diagnostics bench was placed downstream of the RFQ, MEBT, and the first DTL tank, respectively, during different phases of the LINAC4 low and medium energy beam commissioning. This diagnostics bench includes a slit-and-grid emittance meter device designed for a direct sampling of the horizontal and vertical phase space along with several other diagnostic devices. The slit-and-grid emittance measurement has an error of order 10 percentage.
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