Impedance considerations for the Intense Pulse Neutron Source (IPNS) Rapid Cycling Synchrotron (RCS). Page: 4 of 12
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Injection/extraction energy (W;.', Wext) 50 MeV, 450 MeV
Injection/extraction frequency (fii, fext) 2.21 MHz, 5.14 MHz
Average machine radius, R 6.83 m
Bending radius, p 3.68 m
Initial Tunes v,,v, 2.25, 2.35
Lattice DOFDFO (combined fn. dipoles n=11.7)
Injected pulsewidth 70-80 as
Injected charge 3.6x1012 H- (0.58 C)
Extracted ulsewidth (FWHM) 38 ns
Extracted charge 3.2x1012 H (0.51 C)
Rep rate 30 Hz
Peak current 14 A
Bunching factor at extraction 0.19
Table 1: IPNS RCS parameters
d E = V($,0)- V(Os,0)+Vs ($)]
dt coo 2n
0O$= ho1t DE
where V(O,0) = Vof (0, 0), with
f($,0) = sin($) -3sin(2$ + 0).
The space-charge voltage term is expressed as,
Vsc ($) = -q dX($) Rg2 - L$2c2
d$ 12eO2 IR2
To quantitatively evaluate the effects of space-charge and second harmonic (SH) rf
on the bunch, the synchrotron numerical analysis program, CAPTURESPC[1,2] is
employed. CAPTURE_SPC solves the preceding equations with a second-order
"leap-frog" differencing algorithm:
Wn+1/2=Wn-1/2+~nu(f($nen)-f($sn,,0)+_2go h2t dk($)
21t 4nro Rys n d$ 4
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Brumwell, F. R.; Dooling, J. C. & McMichael, G. E. Impedance considerations for the Intense Pulse Neutron Source (IPNS) Rapid Cycling Synchrotron (RCS)., article, September 8, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc621175/m1/4/: accessed February 20, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.