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We developed a new concept of RF (Radio Frequency)
deflector to eliminate undesired nuclear particles from
the secondary RI (Radio Isotope) beam, using their flight
velocity difference in combination with the existing magnetic
beam analyzer. The deflector was installed into the
"RI Beam Factory" in the Institute of Physical and Chemical
Research. In the preliminary test, purity of the secondary
beam was 30 times higher in the separation of 16O, 17F
and 18Ne when compared with the beam obtained only
by the conventional magnetic analyzer system. The
deflector consists of a coaxial cavity, a deflecting electrode,
discriminating slits, a 500 l/s TMP vacuum system
and 25kW RF power supply. The major specifications are
as follows : frequency range from 12 to 18MHz, maximum
voltage of 100kV, electrode gap of 40mm and its
length of 700mm. The discriminating slits are located
1760mm downstream of the deflecting electrode and
their analyzing power is adjusted by the gap. We expect
more precise experiment result will be obtained by using
the RF deflector in "RI Beam Factory". |
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