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RF et instrumentation


Effort has been conducted to develop a 3D code for the modeling multipacting in RF structure. The MUSICC3D program is using particle in cell method. Based on Runge Kutta method and using relativistic equation of motion, the program solves the trajectory of a particle (e-) in the RF field. The integrations over the multi differential Secondary Emission Yield (SEY) is made of Montecarlo method. Two running modes are available. The first one is using a model of virtual particle, the other one make a generation of full cascade o individual electrons. Benchmarking calculations have been done with analytical calculations and 2D particle in cell code. Recently, a benchmarking with real cavity has been started and results have been obtained on QWR cavity from Spiral2.

RF power source SPARE

The LINAC projects which are under construction or going to be built in the coming years (FAIR, LINAC4, ESS) have some common needs in terms of high RF power sources.

In this context, IPN is setting up an RF power test station able to deliver a peak RF power of 2.8 MW (1.5 ms, 50 Hz or 3 ms, 14 Hz) at the required frequencies of these accelerators (352 MHz and 704MH). The station will be integrated into the technical infrastructure SupraTech.

A collaboration agreement between Thales Electron Devices Company and the CNRS has been signed to study, implement and test a klystron.

The Accelerator Division was in charge of the study and the simulation, with the FLUKA code, of the cross bar (transition waveguide - coaxial output), and of radiation levels emitted by the klystron.

IPN has also studied all power supplies required for the klystron operation. The specifications of all auxiliary power supplies were investigated.

Digital Low Level RF

Within the framework of the European research programs EUROTRANS and EURISOL on High Intensity Proton Accelerators, and particularly for the R&D on superconducting Spoke cavities, a Digital Low Level Radio Frequency system has been developed at IPN in collaboration with LPNHE.

This system is used for the control of the phase and the amplitude of the accelerating field in an SRF cavity. Several tests at room temperature and 4.2 Kelvin have been performed at low power (up to 300W) allowing to develop the test bench and the acquisition and supervision system.

Two prototypes of digital board including acquisition and supervision systems have been developed. Tests of the complete system have been performed at high power (up to 10kW) in cryomodule conditions for the SPIRAL2 cavities (@ 88MHz).

Beam diagnostics

The beam diagnostics are important equipment for the transport, the characterisation of the beam and the safety operations of Superconducting high power linacs. Through its commitment in IPHI, Spiral2, IPN has gained an experience in the development of equipment such as current transformer (TI), energy measurement by time of flight, wire scanner and beam position monitor. An R&D work on the TI is supported to improve sensitivity ; resolution and amplitude of the beam current that could be acceptable by the DCCT type detectors commonly used nowadays. The goal of this R&D is to face the challenging requirements in term of accuracy and contribute to the improvement of the safety operation of the new generation of superconducting linacs (MYRRHA and ESS) by measuring the beam losses.



Institut de Physique Nucléaire Orsay - 15 rue Georges CLEMENCEAU - 91406 ORSAY (FRANCE)
UMR 8608 - CNRS/IN2P3

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