歐洲同步輻射裝置ESRF的Joel Chavanne博士于10月底來(lái)我所訪問(wèn)，將于10月28日做題為“Insertion Devices，From third-generation light sources to ultra-small emittance rings”的學(xué)術(shù)報(bào)告，歡迎各位老師、同學(xué)參加！ 

　　報(bào)告題目：Insertion Devices，From third-generation light sources to ultra-small emittance rings 

　　報(bào) 告 人：Joel Chavanne，ESRF 

　　主 持 人：王九慶 副所長(zhǎng) 

　　報(bào)告時(shí)間：10月28日(周一)，下午14:30 

　　報(bào)告地點(diǎn)：主樓C305會(huì)議室 

　　報(bào)告摘要： 

　　The technology of Insertion Devices (IDs) has evolved considerably over the past twenty years. This is due to a large demand for IDs, linked to the construction of many third-generation synchrotron light sources worldwide. 

　　Being the first facility of this kind built in the early 1990s, the European Synchrotron Radiation Facility (ESRF) has pioneered a number of developments in the field of Insertion Devices. This includes new types of magnetic structures, magnetic measurements techniques, field correction methods and studies on the interaction of IDs with a stored electron beam. 

　　The present trends in most existing facilities are largely centred on the development of short-period small gap undulators, such as In-Vacuum Undulators (IVUs) and the recently developed Cryogenic Permanent Magnet Undulators. Superconducting undulators are also being developed in some facilities. 

　　As a result of these developments, the brilliance of undulator sources could be pushed up by more than one order of magnitude. After this, however, any significant further gain in brilliance would only be achievable by reducing the existing few nanometre-radians of horizontal emittance by one or two orders of magnitude. The ESRF is presently involved in the design study of an ‘ultra-small emittance’ storage ring, in view of replacing the existing magnet layout with a new lattice. The resulting potential impact on Insertion Device requirements in terms of field quality needs to be studied to determine if our present achievements are still suitable. 

　　報(bào)告人簡(jiǎn)介： 

　　Following his PHD in electrical engineering, Joel Chavanne joined the ESRF in 1988 to setup the Insertion Device laboratory for building high quality permanent magnet undulators and wigglers as needed by third generation light sources. 

　　He has actively contributed to the magnetic design of insertion devices and new field correction methods known as multipoles and spectrum shimming. He played a significant role in the development of the 3D magnetic codes for Insertion devices which led to the well known RADIA software. 

　　Since 2001, Joel Chavanne is leading the ESRF Insertion Device group who has build more than 120 Insertion devices of various types including a number of structures with pioneering concept. He is presently also involved in the design of advanced magnets for a new ultra small emittance lattice in the frame of the ESRF accelerator upgrade.