Speaker
Dr
Yoshiyuki Yanagisawa
(RIKEN Nishina center)
Description
The high-power production target system of the superconducting RI beam separator
BigRIPS [1,2,3] at RI beam factory (RIBF) was constructed in 2007 and has been
successfully operated since then with the beam powers up to 8 kW. The system
was designed to withstand the energy loss of 22 kW in a Be target of 5.4mm
(1g/cm$^{2}$) thickness for a $^{238}$U beam at 345 MeV/nucleon and 1
particle $\mu$A (82 kW in a beam power). The spot size of the primary beam at
the production target is about 1 mm in a diameter. Therefore the power density
in the target becomes high with 28 kW/mm$^{2}$ on the target surface and
with 5.2 kW/mm$^{3}$ in the target volume. A water-cooled rotating disk target was
developd to cope with such high power density. Stationary targets mounted
on a water-cooled ladder were also provided for low intensity beams.
In the meeting, operational experiences of the water cooled rotating targets as
well as the stationary targets will be presented together with the temperature
measurements of the beam spot for various beam powers up to 8 kW. The maintenance
system of the target will also be discussed.
References
[1] A. Yoshida et. al.: Nucl. Instr. Meth. A 521, 65 (2004).
[2] A. Yoshida et. al.: Nucl. Instr. Meth. A 590, 204 (2008).
[3] A. Yoshida et. al.: Nucl. Instr. Meth. A 655, 10 (2011).
Primary author
Dr
Yoshiyuki Yanagisawa
(RIKEN Nishina center)
Co-authors
Dr
Koichi Yoshida
(RIKEN Nishina Center)
Dr
Toshiyuki Kubo
(RIKEN Nishina Center)