Progress on the Beam Energy Monitor for the SPIRAL2 Accelerator.
The first part of the SPIRAL2 project entered last year in the end of the construction phase at GANIL in France. The facility will be composed by an ion source, a deuteron/proton source, a RFQ and a superconducting linear accelerator. The driver is planned to accelerate high intensities, up to 5 mA and 40 MeV for the deuteron beams. A monitoring system was built to measure the beam energy on the BTI line (Bench of Intermediate Test) at the exit of the RFQ. As part of theMEBT commissioning, the beamenergy will be measured on the BTI with an Epics monitoring application. At the exit of the LINAC, another system will have to measure and control the beam energy. The control consists in ensuring that the beam energy stays under a limit by taking account of the measurement uncertainty. The energy is measured by a method of time of flight; the signal is captured by non-intercepting capacitive pick-ups. This paper describes the BTI monitor interface and presents the system evolution following the design review.
Energy and Longitudinal Bunch Measurements at the SPIRAL2 RFQ Exit
A new step of the SPIRAL2 commissioning started in December 2015 with the acceleration of a first proton beam at the RFQ exit. A test bench, with all the different diagnostics which will be used on the SPIRAL2 accelerator, was installed directly after the first rebuncher of the MEBT line in order to qualify beams but also to test and make reliable the diagnostic monitors. In 2016, different ion beams are qualified by the diagnostic test bench. This paper describes the results of the energy measurements done by a Time of Flight monitor and the longitudinal measurements using a fast faraday cup.
Machine protection strategies for high power accelerators
The Machine Protection System Requirements for a number of accelerators have been reviewed. The specific requirements vary depending on the type of machine, beam power, pulse length, etc. Some system concepts are common to a number of accelerators and these systems will be discussed. The Machine Protection System (MPS) must protect beam apertures and insertable devices from damage, minimize radiation produced by the beam (ALARA) for hands on maintenance, and shut down the beam when beam-on-target parameters drift outside specifications. MPS systems should be used as an Accelerator diagnostic. MPS can trigger data acquisition when a fault occurs, and start post mortem applications automatically. Tight integration with timing and other systems allows automatic recovery from beam faults.