Commissioning of the LCLS Linac and Bunch Compressors

The Linac Coherent Light Source (LCLS) is a SASE x-ray Free-Electron Laser (FEL) project under construction at SLAC [1]. The injector section, from drive-laser and RF photocathode gun through the first bunch compressor, was commissioned in the spring and summer of 2007. The second phase of commissioning, including the second bunch compressor and various main linac modifications, was completed in January through August of 2008. We report here on experience gained during this second phase of machine commissioning, including the injector, the first and second bunch compressor stages, the linac up to 14 GeV, and beam stability measurements. The final commissioning phase, including the undulator and the long transport line from the linac, is set to begin in December 2008, with first light expected in July 2009

Observation of Coherent Optical Transition Radiation in the LCLS Linac

The beam diagnostics in the linac for the Linac Coherent Light Source (LCLS) X-ray FEL project at SLAC includes optical transition radiation (OTR) screens for measurements of transverse and longitudinal beam properties. We report on observations of coherent light emission from the OTR screens (COTR) at visible wavelengths from the uncompressed and compressed electron beam at various stages in the accelerator

Commissioning of the LCLS LINAC

The Linac Coherent Light Source (LCLS) X-ray free electron laser project is currently under construction at the Stanford Linear Accelerator Center (SLAC). A new injector and upgrades to the existing accelerator were installed in two phases in 2006 and 2007. We report on the commissioning of the injector, the two new bunch compressors at 250MeV and 4.3 GeV, and transverse and longitudinal beam diagnostics up to the end of the existing linac at 13.6 GeV. The commissioning of the new transfer line from the end of the linac to the undulator is scheduled to start in November 2008 and for the undulator in March 2009 with first light to be expected in July 2009

Commissioning Results of the LCLS Injector

The Linac Coherent Light Source (LCLS) is a SASE xray Free-Electron Laser (FEL) project presently under construction at SLAC. The injector section, from drive-laser and RF photocathode gun through first bunch compressor chicane, was installed in fall 2006. Initial system commissioning with an electron beam has recently been completed. The second phase of construction, including second bunch compressor and full linac, is planned for 2008. In this paper, we report experimental results and experience gained during the first phase of machine commissioning. This includes the cathode, drive laser, RF photocathode gun, linac booster section, S-band and X-band RF systems, first bunch compressor, and the various beam diagnostics

De diagnostiek van comorbiditeit bij patiënten met een autismespectrumstoornis

achtergrond: Het is dikwijls lastig om te bepalen of er naast een autismespectrumstoornis (ASS) sprake is van psychiatrische comorbiditeit of dat het geobserveerde gedrag voldoende wordt beschreven door de diagnose ASS. doel: Aangeven wanneer men moet denken aan mogelijke comorbide stoornissen bij kinderen en volwassenen met ASS. Hierbij ligt de focus op de drie meest voorkomende comorbide stoornissen bij zowel kinderen als volwassenen met ass, namelijk depressie, angst en ADHD. methode: Bespreken van de beschikbare literatuur en klinische ervaring. resultaten: Bij de diagnostiek van ass en comorbide stoornissen is het belangrijk om een gedegen ontwikkelingsanamnese te hebben. Deze ontwikkelingsanamnese kan tevens dienen als zogenaamd uitgangspunt van het gedrag van de cliënt. Veranderingen in het gedragspatroon ten opzichte van vroeger zijn dikwijls indicatief voor de aanwezigheid van een comorbide stoornis. conclusie: Aangezien ASS een levenslange stoornis is en er in de verschillende levensfases comorbiditeit aanwezig kan zijn die ook behandeling of begeleiding behoeft, zal het diagnostische proces niet stoppen bij het vaststellen van ASS