PIF_General_2008 by panniuniu



            W. Hajdas, R.Brun, K.Egli (PSI), R.Harboe-Sorensen, A.Mohamadzadeh, R.De Marino (ESA-ESTEC)

    New Proton Irradiation Facility PIF test site was installed in the experimental area of the PROSCAN biomedical
    accelerator. First protons were delivered in September 2008 and since then several test and exposure runs were
    successfully conducted. Primary beam energies can be set between 70 and 250 MeV. Further reduction down to few
    MeV is possible with a local degrader. Beam profiles can be adjusted to uniformly cover targets with areas of tens
    cm2. Beam intensities of up to 10 nA allow for efficient irradiations by both space and particle physics communities.

The new exposure site of the PIF facility has been installed        based on the SRAM memory. The SUE monitor was
in the experimental area of the PROSCAN biomedical                  provided for PIF by the European Space Agency ESA – the
accelerator – see Fig. 1. The area has been commissioned in         main user of the facility.
August 2008 and first beam have been successfully
delivered in September. Experimental setup for PIF
irradiations is arranged in a similar manner as in the low
energy site in the NEB area. This way, the former facility
users can conduct their standard tests without any
additional modifications. Moreover the beam line itself has
been equipped with new, more advanced diagnostics like
extra profile and current monitors. The experimental setup
consists of a large bench with a local dosimetry block and a
user frame fixed on the XY-table. A laser aligned with the
beam line axis is mounted at the rear side of the bench. The
beam dump is located directly in the area wall. The
dosimetry block consists of two flat, air filled ionization         Fig. 2: Dosimetry block (ICs, WC) and energy degrader.
chambers ICs and the XY wire chamber WC for monitoring
of the beam intensity and profiles. A local energy degrader
made of 7 Cu-plates of various thicknesses is placed
between the chambers – see Fig. 2. The degrader allows for
a quasi continuous setting of the energy on target down to
ca. 10 MeV. Both setting of the energy with the degrader

                                                                    Fig. 3: Plastic scintillator detectors on DUT frame.
                                                                    Initial energies of protons entering the area can be set
                                                                    between 70 and 250 MeV. Beam optics setups available to
Fig. 1: Location of the PIF facility at PROSCAN.                    date exist for energies of 235, 200, 150, 100 and 70 MeV.
                                                                    They are optimized for both wide and narrow field beams at
and positioning of the user device under test DUT with the
                                                                    DUT with FWHM between 60 and 6 mm respectively.
XY-table are remotely controlled from the PIF
                                                                    Maximum beam intensities allowed for the PIF site are 2
measurement barrack that is located on the roof of the
                                                                    nA for energies above 200 MeV and 10 nA for energies
experimental area. Calibrations of the beam intensity
                                                                    below 100 MeV. The intensity can be remotely set from the
measured by the ionization chambers are performed using
                                                                    operating console in the PIF barrack. As the day shifts are
small plastic scintillator detectors of precisely know area.
                                                                    reserved for biomedical applications, the facility runs either
The detectors are mounted exactly at the position of DUT
                                                                    during the late and night shifts or at weekends. Beam setup
and count single protons passing through the scintillator –
                                                                    and its diagnostic are user friendly and can be performed
see Fig. 3. Calibration runs are performed before starting
                                                                    locally. First tests also showed both high quality of the
the DUT exposures at low beam intensity for all energies
                                                                    beam and stability of the beam-line settings. It should
used in the experiment. Further verification of the proton
                                                                    assure reliable exposures and large number of users tests.
flux is possible with a Single Event Upset SEU Monitor

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