Y. Kawashima et al., New synchronization method of arbitrary different radio frequencies in accelerators - art. no. 082001, PHY R SPE T, 4(8), 2001, pp. NIL_1-NIL_5
Citations number
7
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS
In electron accelerator facilities, radio frequencies for a linac accelerat
or and a circular accelerator including a booster synchrotron ring and a st
orage ring are completely different. In order to improve the beam transmiss
ion efficiency from a linac to a circular accelerator, and to make the beam
intensity constant, both rf's are generally synchronized. This method is w
ell known and uses a common subharmonic frequency of around 10 MHz. The rf'
s used are generated by using a frequency multiplier from the common freque
ncy, and they are continuously generated. We paid attention to the fact tha
t the electron beam from a linac accelerator is always pulsed, and the rf o
f the linac requires only a moment during beam emission and acceleration. T
aking this fact into account, we invented a new synchronization method for
the rf's of both the linac and the circular accelerators. The new method is
explained by describing a concrete example at the synchrotron radiation fa
cility, SPring- 8 (Super Photon ring 8 GeV). A 2856 MHz rf for the linac is
generated by 508.58 MHz rf of the storage ring for a short duration of abo
ut 290 mus. Thus, the phase difference between the two rf's is automaticall
y fixed. This method can be applied to any combination of arbitrary differe
nt rf's.