Status of the intense pulsed neutron source Page: 2 of 28
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Status of the Rapid Cycling Synchrotron
Recently RCS has run with high reliability and delivered time-average
currents of 12 pA (see Figures 1 and 2). Our standard operating mode is to
accelerate to 450 MeV, since the increased reliability at that energy
compensates for the higher neutron yield at the design energy of 500 MeV. In
the October 1984 running period RCS suffered a leak in the cooling line of the
extraction septum magnet, which cost several months of availability which have
been made up in the succeeding months. Recent developments have improved the
performance of the accelerator, namely the installation of a new clock which
enables the accelerator to run almost synchronously with the power line while
still allowing the choppers to operate with high reliability, and the use of
carbon stripping foils which require less conditioning than the polymer foils
used until now, and seem to live longer. These improvements have led to average
currents near 13 pA. At the time of shutdown.for the summer on 3 July, 1985,
the current was 14 pA! Other contributions^ ’ * in this Meeting describe these
developments in greater detail.
Argonne is developing the design for an advanced super pulsed-spallation
neutron source called ASPUN that uses a fixed-field alternating-gradient
accelerator as the proton source. Vork on this design has gone on at a somewhat
reduced pace in the past months, due to the work on other accelerator projects
of importance to the Laboratory.
The design goal for ASPUN is to deliver a peak flux greater than 1 x lO1^
thermal neutrons/cm sec at the beam target with a repetition rate of somewhere
between 10 Hz and 100 Hz. If a direct scaling from the IPNS target, which is
presently in operation at Argonne, is reasonable, an average beam current of
1380 pA at 1500 MeV would be sufficient to achieve this neutron flux. In order
to provide a sizeable safety margin in startup, the design goal for ASPUN is
3800 pA. Table 1 shows a summary of the main-ring parameters.
Status of the ASPUN-FFAG
ASPUN Main Ring Parameters
Injection energy (H~)
Number of sector magnets
Magnetic field (injection/extraction)
Field index k = (R/B) (dB/dR)
Betatron tunes v /v
RF frequencies (5ndzharmonic)
0.413 T/1.327 T
650 n mm-mrad
500 n mm-mrad
Peak RF voltage per turn
Protons per pulse (design goal)
1 x 1014/6 x 1014
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Carpenter, J.M.; Brown, B.S.; Kustom, R.L.; Lander, G.H.; Potts, C.W.; Schulke, A.W. et al. Status of the intense pulsed neutron source, article, January 1, 1985; United States. (digital.library.unt.edu/ark:/67531/metadc1064256/m1/2/: accessed November 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.