Linac4 will be the new linear accelerator of the CERN accelerator chain delivering Hions at 160 MeV from 2016. The increased injection energy compared to the 50 MeV of its predecessor Linac2, combined with a Hcharge-exchange injection, will pave the way to reach ultimate goals for the LHC luminosity. Extensive commissioning of Linac4 is planned for the coming years. For this purpose, the beam will be studied after the exit of Linac4 in a straight line ending at the Linac4 dump, equipped with various beam instruments. An almost 180 m long transfer line will guide the beam to the charge-exchange injection point at the entry of the Proton Synchrotron Booster (PSB). About 50 m upstream of this point, two measurement lines will be upgraded to perform transverse emittance measurements as well as energy and energy spread measurements of the Linac4 beam. A detailed description of the beam measurement principles and setups at these three Linac4 diagnostics lines related to distinct Linac4 commissioning phases will be given.

/pdf/diagnostic-lines-for-the-160-mev-h-linac4-at-cern-22b5svi1hm.pdf

Diagnostic Lines for the 160 MeV H Linac4 at CERN

The Spallation Neutron Source (SNS) successfully met the primary construction project completion milestones in April 2006. An important ingredient of this successful commissioning was the development and use of software tools. With the increasing digitalization of beam diagnostics and increasing complexity of Integrated Control Systems of large accelerators, the need for high level software tools is critical for smooth commissioning. At SNS a special Java based infrastructure called XAL was prepared for beam commissioning. XAL provides a hierarchal view of the accelerator, is data base configured, and includes a physics model of the beam. This infrastructure and individual applications development along with a historical time line of the SNS commissioning will be discussed.

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SNS warm linac commissioning results

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SNS warm linac commissioning results