Gr.A.A.L.
is the acronym
GRenoble Anneau Accelerateur
Laser
The purpose of the project is to build a polarized and tagged intermediate
energy photon beam
(E = 350-1500 MeV)
by Compton backscattering of laser photons off the 6.04 Gev electrons
stored in the ESRF ring in Grenoble.
The gamma-ray beam obtained with this technique is highly polarized
and can be tagged by measuring the scattered electron position analysed
by the dipole magnet downstream of the interaction region.
The coupling of a fully polarized gamma-ray beam with a large solid
angle detector will give access to:
- polarization degrees of freedom in photonuclear experiments,
- measuremets of very low photonuclear cross sections,
The beam and the detector are built by an international collaboration
including
7 INFN laboratories and sections
(Roma2, Laboratori Nazionali di Frascati, Genova, Roma1,
Catania, Laboratori Nazionali del Sud and Torino),
2 IN2P3 laboratories (LPSC Grenoble,
IPN Orsay),
2 Russian Institutions (INR-The Russian Academy of Sciences, Kurchatov
Institute)
