Irradiation Area n TOF collaboration meeting CERN 27

Irradiation Area n. TOF collaboration meeting CERN 27 -28 Nov 2018 Vasilis. Vlachoudis@cern. ch Francisco. Ogallar. Ruiz@cern. ch Lucia. Anna. Damone@cern. ch

Introduction • • Make use of the instantaneous high neutron flux, existing close to the spallation target for activation/integral measurements. Possible locations under investigation: • • Interior of the shielding (TARget area) Outside the shielding (NEAR area) The locations will be accessible with the rabbit/pneumatic system Possible Measurements: • • • Activation with threshold elements (n, lcp) Activation with filters Radiation to electronics Imaging Dosimetry …

Geometry

Target area with rabbit

Geometry Small variation of flux based on location TAR rabbit stop Collimation System Possible location of filter station NEAR rabbit stop

Neutron Fluence

Navette

Filters TARget area • Big navette dimensions and useful payload poses limitations on the use of filters NEAR area • The flux is uni-directionial permits the use of filters with a remote filter exchanger mechanism • Some filters (preliminary calculations) • Nat-Cd [5 mm] • • 10 B [10 mm] Al [20 mm] S [100 mm] V[28 mm] Background out of this scale

Filters TARget area • Big navette dimensions and useful payload poses limitations on the use of filters NEAR area • The flux is uni-directionial permits the use of filters with a remote filter exchanger mechanism • Some filters (preliminary calculations) • Nat-Cd [5 mm] • • 10 B [10 mm] Al [20 mm] S [100 mm] V[28 mm]

Filters TARget area • Big navette dimensions and useful payload poses limitations on the use of filters NEAR area • The flux is uni-directionial permits the use of filters with a remote filter exchanger mechanism • Some filters (preliminary calculations) • Nat-Cd [5 mm] • • 10 B [10 mm] Al [20 mm] S [100 mm] V[28 mm] Not working

Filters TARget area • Big navette dimensions and useful payload poses limitations on the use of filters NEAR area • The flux is uni-directionial permits the use of filters with a remote filter exchanger mechanism • Some filters (preliminary calculations) • Nat-Cd [5 mm] • • 10 B [10 mm] Al [20 mm] S [100 mm] V[28 mm]

Filters TARget area • Big navette dimensions and useful payload poses limitations on the use of filters NEAR area • The flux is uni-directionial permits the use of filters with a remote filter exchanger mechanism • Some filters (preliminary calculations) • Nat-Cd [5 mm] • • 10 B [10 mm] Al [20 mm] S [100 mm] V[28 mm]

Summary and whats next… • • • Both locations have potential and can be targeted for different types of measurements TARget interior location, isotropic high instantaneous flux (>1010 n/cm 2/pulse) • • Y R A N I M I L E R P Y R E V thermal and epithermal flux is indifferent of the location higher energy neutrons, is reduced when far away from the target NEAR area, directional flux of (~109 n/cm 2/pulse) • • relatively good background condition (to be verified with the new shielding) Possibility to have a filter station Nat. Cd, 10 B, S, V seems to work well. Studies just started: • • Simulation of the whole setup Filters and reconstruction of the cross section Collimation system to reduce the unwanted halo Side Target “moderator” to shape the neutron spectrum Engineering problems: • • • Accuracy on the positioning/vertical direction of the sample Controls (cables) for the R 2 E or any other possible active measurement …