undulator

Paper	Title	Other Keywords	Page
TOAA03	Status of the X-Ray FEL Control System at SPring-8	controls, klystron, electron, linac	50
	T. Hirono, N. Hosoda, M. Ishii, T. Masuda, T. Matsushita, T. Ohata, M. T. Takeuchi, R. Tanaka, A. Yamashita JASRI/SPring-8, Hyogo-ken M. K. Kitamura, H. Maesaka, Y. Otake, K. Shirasawa RIKEN Spring-8 Harima, Hyogo T. Fukui RIKEN, Hyogo
	The X-ray FEL project at SPring-8 aims to build an X-ray lasing facility, which will generate brilliant coherent X-ray beams with wavelength of below 0.1nm. A combination of short-period in-vacuum undulators and an 8GeV high-gradient C-band linear accelerator makes the machine compact enough to fit into the SPring-8 1km-long beamline space. The machine commissioning will be started by March 2011. We designed the control system for the new machine based on the present SCSS test accelerator, which employs the MADOCA framework. The control system is based on the so-called “standard model” and composed of Linux-based operator consoles, database servers, Gigabit Ethernet, VMEbus system, and so on. The control system, also, has a synchronized data-taking scheme to achieve beam-based optics tuning. Most of the device control part is installed in water-cooled 19in. racks together with RF devices for temperature control, which guarantees stable RF phase control. This paper gives an overview of the project and describes the design of the control system. In addition, we briefly report the status of the SCSS test accelerator operated as a VUV-FEL user facility.
	Slides
TPPB32	EPICS at the Synchrotron Radiation Source DELTA	controls, photon, synchrotron, diagnostics	232
	S. Doering, U. Berges DELTA, Dortmund
	Since 1999 the control system at the synchrotron radiation source DELTA, located at the University of Dortmund, Germany, has operated under EPICS. The change from a nonstandard, handmade system to EPICS has been made stepwise till 2001. Since 2002 the first two beamlines in the soft X-ray region are also operated under EPICS to benefit from the easy communication with the accelerator control system. A complete plane-grating-monochromator-beamline (PGM-beamline U55) with its experiment is operated under EPICS, including the stepper motors and device readout. A toroidal-grating-monochromator-beamline (TGM-beamline) has been completely changed from an old system into EPICS control system. At both beamlines new photon-bpm-readout systems under a LINUX-PC and EPICS from the company ENZ are tested. Also a compact stepper motor driver unit with a small LINUX-PC has succesfully been developed in this cooperation. DELTA works as a test facility for these new developments. The easy and fast exchange of the necessary data with the machine control system is an advantage as is the benefit from the EPICS community.
RPPA19	Photon Diagnostic Station for TAC IR-FEL Test Facility	diagnostics, photon, laser, electron	556
	I. Tapan UU, Bursa
	The Turkic Accelerator Center (TAC) project has been accepted by Turkish government. According to this project, a linac-based infrared oscillator free electron laser (FEL) will be constructed as a TAC test facility by the end of 2010. Planning work has been ongoing for the firt FEL facility building in Turkey. Both 20- and 40-MeV electron energies will be used to obtain infrared photons in the wavelength region of 1 to 100 micrometers. The IR FEL photons generated by two undulators will be transported through the respestive two photon beam lines to the experimental hall, where they are fed in to eight experimental station. Photon diagnostic station will be located in the experimental hall to measure the properties of the photon beam. In this work, the performance of the designed IR-FEL photon diagnostic station for the TAC test facility has been discussed.
RPPA29	A Feed-Forward Procedure to Counteract Orbit Distortions and Photon Beam Displacements from Insertion Device Operation at the SLS	photon, insertion, insertion-device, electron	573
	T. Schmidt, A. Streun, D. Zimoch, J. T.M. Chrin PSI, Villigen
	Insertion devices of various types provide light of high brilliance to experimenters at the SLS beamlines. Changes in the photon energy and polarization by movement of the ID gap and phase shift, however, cause orbit distortions that result in a displacement of the photon beam in both angle and position at the beamline. A feed-forward correction scheme has been developed to quantify and precisely correct these effects using designated correctors local to the photon source. The corrector settings are determined using an orbit configuration consisting of 73 digital BPMs and associated correctors; recently commissioned X-ray BPMs located at the beamline front-end are also included in the correction algorithmn and serve to constrain the photon beam to its specified position. The feed-forward table is finally implemented at the local processor level and applied at a rate of 10 Hz. A photon pointing stability at the sub-microradian level is achieved. The entire gap scan, feed-forward generation and subsequent verification can now be completed within 15 to 60 minutes depending on the complexity of the ID. The methodology of the procedure and high-level software framework is described.