VISA I Summary
Original VISA experiment took place at Accelerator Test Facility (ATF) at BNL in 1999-2001. The experiment was set as a collaboration of BNL, LLNL,SLAC, and UCLA to study SASE properties at linear gain regime and saturation, using high brightness electron beam available at ATF. The experiment utilized novel 4-m long strong focusing undulator, constructed at SLAC. FEL saturation was achieved at 840 nm wavelength, with the record short gain length of 17.9 cm:
In post-analysis of VISA I results start-to-end simulation model was developed and detailed agreement was achieved between measured and simulated SASE properties even for quite unusual results, such as hollow angular distribution of SASE radiation:
This extensive webpage, maintained by Heinz-Deiter Nuhn (SLAC), offers useful information relating to the VISA experiment including parameter tables, publications, an image gallery, a theory section and a brief historical overview of the VISA project.