Development of a power meter equipped target for ISOLDE RILIS

The resonance ionization laser ion source (RILIS) at the ISOLDE on-line isotope separator is based on the selective excitation of atomic transitions by tuneable laser radiation. RILIS has become more and more important and is today requested by the ISOLDE users for more than 50% of the time. Up to three independent laser beams are sent from the laser installation to the ISOLDE frontend where the target and ion source is mounted [1]. To monitor the beam position, a virtual reference point is generated inside the laser room by means of a quarts plate, mounted half way between laser table and ion source. A reflection from this surface allows monitoring the laser beam positions in the reference point.