6th Framework Programme
Structuring the ERA
(Contract No. RII3-CT-2004-506078)
TARI is the acronym for Transnational Access to Research Infrastructures. It is one of the activities that make up the Integrated Infrastructures Initiative "Strongly Interacting Matter" (acronym: "HadronPhysics"), financed by the European Commission and coordinated by INFN.
The objective of TARI is to provide researchers from the European and Associated Countries with free access supported by the European Commission to the major research infrastructures in Europe.
The access to the HERMES experiment is implemented within the contract HadronPhysics I3. This contract includes three blocks of activities: networking, research projects and transnational access and involves 120 Institutes. Referring to the transnational access, this contract will support the mobility costs of visiting scientists and the expenses for the infrastructure.
HERMES employs targets of nuclear-polarized atomic hydrogen or deuterium gas and various unpolarized gases in the 27.5 GeV HERA polarized-electron storage ring. Various polarization asymmetries are measured for inclusive and semi-inclusive deeply inelastic scattering, as well as exclusive processes such as deeply virtual Compton scattering (DVCS). The angles and energies of scattered particles are determined by a magnetic spectrometer with complete hadron identification. Measurements with longitudinal target polarization were made in 1995-2000, and more with transverse polarization have continued since 2002. A target recoil detector surrounding an unpolarised hydrogen target for further DVCS measurements is scheduled for installation for the last two years of HERMES data taking.
The access to HERMES will include all the infrastructural, logistical, technological and scientific support that is normally provided to external researchers given access to the infrastructure.