New concept CCD camera for laser-produced plasmas imaging spectroscopy in the XUV spectral region

摘要

A new concept, compact and vacuum compatible CCD camera has been developed for application in the extreme ultraviolet and soft x-ray (XUV) spectroscopy. The main features of this detector are a 'remote cooling' system, the possibility to locate the same CCD camera on the Rowland circle of spectrometers having a normal or grazing incidence configuration, a compact and lightweight package, the vacuum compatibility and the compatibility with two CCD sensors, available for applications in the spectral region of interest (10 divided by 800 angstrom). The 'remote cooling' means a themoelectric cooler placed on the spectrometer wall, connected to the CCD camera by means of a 35 cm long, flexible thermal conductor allowing a minus 40 degree Celsius operative temperature of the sensor. The bidimensional capabilities of the CCD, in conjunction with the stigmaticity of the toroidal grating used as dispersing element inside the normal incidence spectrograph allow both spectral and spatial resolutions on the light source. THe first observation performed by this detector concerns the EUV spectrum of an aluminum laser produced plasma and it is presented here.