TBS source

The STAR laser system (HE-LASER) consists of a MAGMA 500 laser apparatus supplied by Amplitude.

Additionally, two optimized interaction chambers have been developed, one for the LE-linac and the other for the HE-linac. These chambers have been designed to be identical since both interaction zones follow the same optical layout for the electron beam.

The key requirements for the interaction chambers are:

• The ability to adjust the interaction angle between electrons and photons within the range of 175-178 degrees, achieved through a motorized mirror mounted on a gimbal block.
• The ability to modify the laser’s focal spot size by adjusting the focal length using a tunable telescope.
• The collision angle is maintained at 5°, as defined by the ICS nomenclature, where 0° represents a head-on collision.

The laser pulse is focused using a system with 2-inch lenses to prevent damage to optical components. Similarly, the high-incidence-angle mirror ensures laser extraction while remaining below the mirror damage threshold. The laser pointing stability is designed to be maintained within less than 5 μm.