The LUNEX5 (free electron Laser Using a New accelerator for the Exploitation of X-ray radiation of 5th generation) in France aims at investigating the generation of short, intense, and coherent pulses in the soft x-ray region (with two particular targeted wavelengths of 20 and 13 nm). It consists in a single Free Electron Laser (FEL) line with cryo-ready invacuum undulators using a Conventional Linear Accelerator (CLA) using the superconducting technology of 400 MeV or a Laser Wake Field Accelerator (LWFA) ranging from 0.4 to 1 GeV with multi-TW or PW lasers. The FEL line can be operated in the seeded (High order Harmonic in Gas seeding) and Echo Enable Harmonic Generation configurations, which performances will be compared. Two pilot user experiments for time-resolved studies of isolated species and magnetization dynamics will take benefit of LUNEX5 FEL radiation.

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Abstract. Now that the machine and beamlines are in operation, new requirements have been identified. On the machine, a significant effort is under way to improve beam orbit stability. Among the sources of noise which perturb the electron beam, the effect of the undulators' transient electromagnetic fields has been identified. On beamlines using electromagnetic insertion devices, fast variation of the electromagnetic field is required. In order to improve this performance, a new implementation of the control system for the electromagnetic insertion devices (HU256, HU640 and EMPHU) was designed. This new control is based on a set of boards developed at SOLEIL, called "SPI BOARD PACKAGE". 1.Introduction This paper describes enhancements to control of insertion devices. Firstly, we will present an overview of the "SPI BOARDS PACKAGE". We will then describe the architecture for upgrading the control of undulators, and explain the improvement to beam orbit stability. Finally, we will present the work done to improve the speed of the variation of magnetic field of insertion devices, which will be useful for dichroism experiments. 2.Overview of the SPI BOARDS PACKAGE This development has been specified in order to improve the performance and reliability of the machine and beamlines. The requirements identified are: beam stability improvement [1] (FeedForWarD(FFWD) for HU256, HU640), faster and more reliable control for insertion devices (HU640 and EMPHU), synchronization of data acquisition between equipment: monochromators, insertion devices, detectors (i.e. Pilatus, CCD, camera), nanopositioning… In order to provide a modular solution, the SOLEIL electronics group has developed a set of boards known as the "SPI BOARDS PACKAGE" [2]. This package of boards allows us to embed processspecific functions and to manage synchronizations at low level. It gives us a platform to develop solutions with simple, reliable and durable tools. In the SPI board package architecture (Figure 1), the boards can be connected together in a daisy chain and communicate with the controller via a SPI (Serial Peripheral Interface) Bus. Communication with the SOLEIL control system is via Ethernet. Each board can be connected with others as needed. The package also enables us to deliver solutions for applications with an analogue interface (SPIDAC/SPIADC) or motion interface (SPIETBOX). Published under licence by IOP Publishing Ltd

Abstract. LUNEX5 (free electron Laser Using a New accelerator for the Exploitation of X-ray radiation of 5th generation) aims at investigating the production of short, intense, and coherent pulses in the soft x-ray region. The single Free Electron Laser (FEL) line fed either by a superconducting Linear Accelerator of 400 MeV or a 0.4-1 GeV Laser Wake Field Accelerator (LWFA) enables seeding (High order Harmonic in Gas seeding and Echo Enabled Harmonic Generation) for the advanced fourth generation source with the conventional accelerator, and single spike operation for the fifth generation source with the LWFA. Two pilot user experiments for time-resolved studies of isolated species and solid state matter will take benefit of LUNEX5 FEL.