A systematic study of photon and neutron radiation doses generated in high-intensity laser-solid interactions is underway at SLAC National Accelerator Laboratory. These laser-solid experiments are being performed using a 25 TW (up to 1 J in 40 fs) femtosecond pulsed Ti:sapphire laser at the Linac Coherent Light Source's (LCLS) Matter in Extreme Conditions (MEC) facility. Radiation measurements were performed with passive and active detectors deployed at various locations inside and outside the target chamber. Results from radiation dose measurements for laser-solid experiments at SLAC MEC in 2014 with peak intensity between 10 and 7.1 × 10 W cm are presented.

Abstract. The LCLS-II superconducting electron accelerator at SLAC plans to operate at up to 4 GeV and 240 kW average power, which would create higher radiological impacts particularly near the beam loss points such as beam dumps and halo collimators. The main hazards to the public and environment include direct or skyshine radiation, effluent of radioactive air such as 13 and its waste water discharge; explosion from H2 build-up in surge tank and release of radionuclides] associated with the high power beam dumps are also presented.

Comprehensive measurements for photon and neutron radiation doses generated from laserplasma interaction at SLAC's MEC laser facility have been conducted. The goals of the measurements were to:1. determine the radiation dose per laser shot as a function of laser, optic and target parameters that are relevant to the MEC laser operations, 2. validate the RPD-developed analytic model for photon dose calculations, and 3. evaluate the performance of various types of passive and active detectors in the laserinduced radiation fields.The MEC radiation measurements had laser irradiance between 3x10 16 and 6x10 17 W/cm 2 (about 30 to 150 mJ per pulse and 40 fs) hitting mainly thin gold and copper target plates. Radiation measurements with 10 Hz of laser pulses rastering over the target surface were conducted at various distances and angles relative to laser beam and target using a comprehensive set of passive and active detectors placed inside and outside the MEC aluminum target chamber, as well as outside the MEC hutch 6.Both passive and active detectors measured photon doses that agree with the RPD dose model calculations in this irradiance range. Active detectors were not affected by the electromagnetic pulses associated with the laser operation.

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