“n @ BTF”… Study and Design of an experiment at the DAFNE BTF for neutron Photo-production S. Bartalucci, R. Bedogni , B. Buonomo, A. Esposito , G. Mazzitelli, L. Quintieri Technical support of FISA, Acc. Div. And Res. Div. of LNF G. Mazzitelli – CSN5, Ferrara 17 Sep 2008

G. Mazzitelli – CSN5, Ferrara 17 Sep 2008 The DAFNE BTF BTF high current Linac: 1 - 500 mA e- 200 mA e+, 1 - 10 ns pulses, at least 107 particles The BTF is a e-/e+ test-beam facility in the Frascati DAFNE collider complex Need to attenuate the primary beam: Single particle regime is ideal for detector testing purposes Allows to tune the beam intensity Allows to tune the beam energy G. Mazzitelli – CSN5, Ferrara 17 Sep 2008

G. Mazzitelli – CSN5, Ferrara 17 Sep 2008 BTF layout BTF Hall 4 m 5.5 m Hall control room LINAC tunnel momentum analyzer main ring G. Mazzitelli – CSN5, Ferrara 17 Sep 2008

LINAC beam attenuation Selected energy (MeV) N. of particles detector 1e- 2e- 3e- 103 102 10 1 W slits LINAC Beam 1-500 mA 100 300 500 450 magnet tunable Cu target: 1.7, 2.0, 2.3 X0 G. Mazzitelli – CSN5, Ferrara 17 Sep 2008

BTF beam characteristic Beam (e- or e+) intensity can be adjusted by means of the energy dispersion and collimators, down to single particle per pulses Number (particles/pulse) 1105 11010 Energy (MeV) 25-500 25750 Repetition rate (Hz) 20-50 50 Pulse Duration (ns) 10 1 or 10 p resolution 1% Spot size (mm) sx,y ≈ 2 (single particle) up to 10*10 (high multiplicity) Divergence (mmrad) s’x,y ≈ 2 (single particle) up to 10 (high multiplicity) Multi-purpose facility: H.E. detector calibration and setup Low energy calorimetry & resolution Low energy electromagnetic interaction studies High multiplicity efficiency Detectors aging and efficiency Beam diagnostics G. Mazzitelli – CSN5, Ferrara 17 Sep 2008

G. Mazzitelli – CSN5, Ferrara 17 Sep 2008 Motivation General interest of BTF scientific community for the neutron production at BTF Possibility to test detector diagnostic at low neutron flux and low energy Generation of the knowhow needed for next generation of high energy source (see FEL) Possibility to have a new European facility in ISO standard G. Mazzitelli – CSN5, Ferrara 17 Sep 2008

Study of optimized target: lead TGT sphere R=12X0 Up to 100 MeV the spectrum is described as a Maxwellian distribution with average around 1 MeV Approaching the higher energies the Quasi-Deuteron Effects adds a tail of high-energy neutrons to the Giant resonance spectrum. The slope becomes stepper as the incident electron energy is approached Monte Carlo simulation ( by Fluka code) Fluka result:1.6826 10-1 neutron/primary G. Mazzitelli – CSN5, Ferrara 17 Sep 2008

G. Mazzitelli – CSN5, Ferrara 17 Sep 2008 Experimental Set-up BTF Experimental Hall Taget with multiple beam extraction lines (MC model) e- beam neutron exit at different angle Transfer Line G. Mazzitelli – CSN5, Ferrara 17 Sep 2008

High lights and support LNF Facility LNF is ideal site for testing neutron photo-production: BTF is the only European facility running with high electron intensity at low energy The energy limitation of the BTF allows to investigate a neutron production energy rage of interest for many purpose, that will not be overlapped with the next high intensity future facility Acc. Div. Technical support for operation and setup The service support Accelerator Division (mechanical design, alignment, etc) FISA (FIsica SAnitaria) Research Division (electronics, machinery, etc) G. Mazzitelli – CSN5, Ferrara 17 Sep 2008

G. Mazzitelli – CSN5, Ferrara 17 Sep 2008 Conclusion Neutron Detectors R&D for very precise Spectra measurement in high energy electron accelerators R&D experiment to study the neutronic photoproduction source in order to acquire the necessary KNOW-HOW for future application with high intensity source (for medical and industrial applications) build an European INFN facility that allows the study and calibration of detectors and instrumentations for high energy neutrons with application in nuclear physics, dosimetry and radioprotection investigate the feasibility of a could neutron source (with energy less than 1eV). This kind of source has a great interest both in fundamental physics and for applications in nano-technologies G. Mazzitelli – CSN5, Ferrara 17 Sep 2008

G. Mazzitelli – CSN5, Ferrara 17 Sep 2008 Work done e to be done Preliminary Monte Carlo Simulations to estimate the source term and neutron spectra; Definition of the optimized Target and of extraction lines (done) Individuate different working configurations (using different moderating material layers) to reproduce different neutron spectra (in progress); Individuate a configuration for having monochromatic cold neutron beams (i.e with energy < 1eV) (estimation of the neutron rate) Target + Shield + Support final DESIGN and construction The techniques needed for the determination of the neutron spectra from thermal to GeV neutrons are already known and consolidated (Bonner Spheres, activtion foils,nuclear track detectors....) G. Mazzitelli – CSN5, Ferrara 17 Sep 2008

Richieste 1.8 fte Primo Anno Voce Costo kEuro G. Mazzitelli (responsible), S.Bartalucci, B.Buonono (art.23), R. Bedogni (art.23), A.Esposito, L.Quintieri (art.23) 1.8 fte Primo Anno Voce Costo kEuro realizzazione bersaglio di Tungsteno 10/10 sub judice Schermatura ottimizzata 22/22 sub judice Meccanica per movimentazione 8/1 Diagnostica di base 5/0 Missioni Estere 8/2 Missioni Interne 4/1 Secondo Anno Diagnostica Avanzata per quantametria di fascio 20 Elettronica 10 Consumo (gas,etc) 5 8 4 G. Mazzitelli – CSN5, Ferrara 17 Sep 2008