Speaker
Description
The Beam-Test Facility (BTF) of the INFN - National Laboratories of Frascati is an extraction and transport line of DAFNE LINAC. It is optimized for the production of electrons and positrons in a wide range of intensity, energy (30 MeV – 750 MeV), beam spot dimensions and divergence, using both primary and secondary beam of the DAFNE LINAC.
Through the years, the BTF has gained an important role in particle detectors electron/positron beam test and development. A small fraction of the BTF’s shifts have been dedicated to radiation damage test using LINAC electron primary beam up to $5 \times 10 ^ {10}$ e-/s.
As radiation protection group, we are in charge of dose evaluation when electrons impinging on a target from:
- photon Bremsstrahlung production on a Pb target;
- photo-production of neutrons from electrons impinging on a Pb target.
Two dedicated tests with 503 MeV electrons impinging on a $\sim$ 16 cm tick Pb target have been carried out in February and June 2022 using TLD700 and TLD600, measuring doses at several charge intervals. The detector response have been calibrated at Cs-137, so that a MC comparison has needed to validate the results at higher energies and benchmark the simulation itself.
For the last exposition test in June, in addition to TLDs, more detectors have been exposed in the same experimental condition and at 90 degrees w.r.t. the lead target: two WENDIs from Thermo Fisher; two Gamma Tracers Wide from Bertin and CR39s.
The experimental setup, data acquisition and analysis, together with FLUKA modeling of the test will be presented. A great MC-data agreement has been achieved for gamma dose estimation. At the moment of writing, the neutron dose study is ongoing.