Böge, M.

Paper	Title	Page
THXCH01	Achieving Sub-micron Stability in Light Sources	211
	M. Böge PSI, Villigen
	One of the major goals for present and future light sources is to achieve sub-micron orbit stability of the electron beam at the photon beam source points over a large frequency range. This puts tight constraints on the design of the various accelerator components like girders, magnets, power supplies and diagnostic hardware. Fast orbit feedbacks systems based on high performance RF- and X-BPMs become essential to suppress residual orbit distortions. Furthermore the "top-up" operation mode which guaranties a constant electron beam current and thus a constant heat load in 3rd generation light sources is one of the key ingredients to reach sub-micron stability.
	Video of talk
	Transparencies
THOACH01	SPEAR3 Commissioning	216
	J.A. Safranek, S. Allison, P. Bellomo, W.J. Corbett, M. Cornacchia, E. Guerra, R.O. Hettel, D. Keeley, N. Kurita, D.J. Martin, P.A. McIntosh, H. Morales, G.J. Portmann, F.S. Rafael, H. Rarback, J.J. Sebek, T. Straumann, A. Terebilo, J. Wachter, C. Wermelskirchen, M. Widmeyer, R. Yotam SLAC/SSRL, Menlo Park, California M.J. Boland, Y.E. Tan ASP, Melbourne J.M. Byrd, D. Robin, T. Scarvie, C. Steier LBNL/ALS, Berkeley, California M. Böge PSI, Villigen H.-P. Chang, C.-C. Kuo, H.-J. Tsai NSRRC, Hsinchu W. Decking DESY, Hamburg M.G. Fedurin, P. Jines LSU/CAMD, Baton Rouge, Louisiana K. Harkay, V. Sajaev ANL/APS, Argonne, Illinois S. Krinsky, B. Podobedov BNL/NSLS, Upton, Long Island, New York L.S. Nadolski SOLEIL, Gif-sur-Yvette A. Ropert ESRF, Grenoble M. Yoon POSTECH, Pohang, Kyungbuk
	Starting in April, 2003, the SPEAR2 storage ring was removed and replaced with a new 500 mA, 3 GeV light source, SPEAR3. The SPEAR2 storage ring had been in use for high energy physics, then synchrotron radiation since 1972. Commissioning of SPEAR3 started on December 8, 2003 and synchrotron radiation will be delivered to the first users on March 8, 2004. SPEAR3 commissioning will be reviewed, including discussion of diagnostics, orbit control, optics correction and high current studies.
	Video of talk
	Transparencies
THPKF011	Vibration Measurements at the Swiss Light Source (SLS)	2275
	S. Redaelli, R.W. Assmann, W. Coosemans CERN, Geneva M. Böge, M. Dehler, L. Rivkin PSI, Villigen
	Vibration measurements have been carried out at the Swiss Light Source (SLS) site as part of a collaboration between the Paul Scherrer Institute (PSI) and the European Organization for Nuclear Research (CERN). The vibration level of the SLS floor and of some lattice elements of the SLS ring have been monitored under various experimental conditions. In particular, vibration spectra of lattice quadrupoles have been measured with a circulating beam and compared with the spectra of transverse beam positions, as measured with beam position monitors. This paper summarizes the results.
THPLT023	The Use of Photon Monitors at the Swiss Light Source	2517
	J. Krempasky, M. Böge, T. Schilcher, V. Schlott, T. Schmidt PSI, Villigen
	The photon beam position monitors (PBPM) in a synchrotron radiation facility are important tools for beam-line and machine diagnostics since they deliver position and angle information directly from the radiation source point. In the last two years a number of PBPMs have been installed and commissioned at the Swiss Light Source (SLS). Their readouts have been systematically studied and the results have been correlated with data from the digital beam position monitor (DBPM) system. It turns out that the PBPMs help understanding the influence of insertion device gap changes on photon beam position and thus on photon flux and/or energy resolution near the beam-line experimental stations. In addition to the global fast orbit feedback (FOFB), a local slow feedback based on PBPM data has been implemented to remove the remaining systematic effects of the DBPM system and to stabilize the photon beam to a micron level at the experimental station.
THPLT024	Commissioning and Operation of the SLS Fast Orbit Feedback	2520
	T. Schilcher, M. Böge, B. Keil, P. Pollet, V. Schlott PSI, Villigen
	The SLS Fast Orbit Feedback (FOFB) was successfully commissioned in 2003. Since November 2003 it runs during user operation of the accelerator. Taking into account 72 Digital Beam Position Monitors (DBPMs), the FOFB applies SVD-based global orbit corrections for 72 horizontal (x) and 72 vertical (y) correctors at a rate of 4 kHz, compared to ~0.5 Hz for the Slow Orbit Feedback (SOFB) that was used so far. While the SOFB was important for the elimination of orbit drifts due to temperature changes and slowly moving insertion device (ID) gaps, the FOFB is also able to damp orbit oscillations that are caused by fast changes of ID gaps or magnets, by ground and girder vibrations, 3 Hz booster crosstalk and power supply noise. This report presents experience from commissioning and user operation of the FOFB.