TY - JOUR
T1 - High resolution beam line for the Grand Raiden spectrometer
AU - Wakasa, T.
AU - Hatanaka, K.
AU - Fujita, Y.
AU - Berg, G. P.A.
AU - Fujimura, H.
AU - Fujita, H.
AU - Itoh, M.
AU - Kamiya, J.
AU - Kawabata, T.
AU - Nagayama, K.
AU - Noro, T.
AU - Sakaguchi, H.
AU - Shimbara, Y.
AU - Takeda, H.
AU - Tamura, K.
AU - Ueno, H.
AU - Uchida, M.
AU - Uraki, M.
AU - Yosoi, M.
N1 - Funding Information:
We are grateful to the RCNP accelerator group for their help in various stages of construction and R/D. We also thank Professors H. Ejiri and Y. Nagai for their continuous encouragement throughout the work, and the RCNP Ring Cyclotron crew for their efforts in providing a good quality beam. We greatly thank Professor J. Cameron for donating the decommissioned IUCF K600 dipole magnets. The experiments were performed at RCNP by using R/D beam time and also under Program Number E155. This work was supported in part by the Grant-in-Aid for Scientific Research No. 12740151 of the Ministry of Education, Science, Sports and Culture of Japan.
PY - 2002/4/11
Y1 - 2002/4/11
N2 - We have designed and constructed a new beam line which can accomplish both lateral and angular dispersion matching with the Grand Raiden spectrometer. In dispersive mode, lateral and angular dispersions of the beam line are b16 = 37.1 m and b26 = -20.0 rad, respectively, to satisfy matching conditions for Grand Raiden. In achromatic mode, the beam line satisfies the double achromatic condition of b16 = b26 = 0. The magnifications of the beam line are (Mx, My) = (-0.98, 0.89) and (-1.00, -0.99) for dispersive and achromatic modes, respectively. In the commissioning experiments, we have succeeded to separate the first excited 2+ state of 168Er with Ex = 79.8 keV clearly from the ground state in the (p, p′) reaction. We achieved energy resolutions of ΔE = 13.0 ± 0.3 and 16.7 ± 0.3 keV in full width at half-maximum for 295 and 392 MeV protons, respectively. These energy resolutions agree with the resolving power of Grand Raiden for an object size of about 1 mm.
AB - We have designed and constructed a new beam line which can accomplish both lateral and angular dispersion matching with the Grand Raiden spectrometer. In dispersive mode, lateral and angular dispersions of the beam line are b16 = 37.1 m and b26 = -20.0 rad, respectively, to satisfy matching conditions for Grand Raiden. In achromatic mode, the beam line satisfies the double achromatic condition of b16 = b26 = 0. The magnifications of the beam line are (Mx, My) = (-0.98, 0.89) and (-1.00, -0.99) for dispersive and achromatic modes, respectively. In the commissioning experiments, we have succeeded to separate the first excited 2+ state of 168Er with Ex = 79.8 keV clearly from the ground state in the (p, p′) reaction. We achieved energy resolutions of ΔE = 13.0 ± 0.3 and 16.7 ± 0.3 keV in full width at half-maximum for 295 and 392 MeV protons, respectively. These energy resolutions agree with the resolving power of Grand Raiden for an object size of about 1 mm.
KW - (p, p′) Reaction
KW - Beam transport
KW - Dispersion matching
KW - Magnetic spectrometer
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U2 - 10.1016/s0168-9002(01)01686-2
DO - 10.1016/s0168-9002(01)01686-2
M3 - Article
AN - SCOPUS:0037061795
VL - 482
SP - 79
EP - 93
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
SN - 0168-9002
IS - 1-3
ER -