T. Tanabe et al., DEVELOPMENT OF AN IN-VACUUM MINIPOLE UNDULATOR ARRAY FOR NATIONAL SYNCHROTRON LIGHT-SOURCE IN-VACUUM UNDULATOR, Review of scientific instruments, 69(1), 1998, pp. 18-24
An in-vacuum minipole (short period) insertion device has been develop
ed in a collaboration between SPring-8 and the National Synchrotron li
ght Source (NSLS). The magnetic arrays were assembled, field measured,
corrected, and vacuum tested by SPring-8 and were installed in an NSL
S-developed chamber with mechanical parts in the NSLS X-Ray Ring (E =
2.584 GeV) in May 1997 and a successful commissioning of the device wa
s carried out in June 1997. The device is made of permanent magnets wi
th 30.5 periods and a period length of 11 mm, It is designed to produc
e fundamental radiation at 4.6 keV, and with a modest value of deflect
ion parameter (K = 0.7 at 3.3 mm gap) enables higher harmonics to be u
sed as well, fora variety of experiments. A detailed description of th
e mechanical support and vacuum chamber will be reported elsewhere. We
describe technical challenges encountered in constructing this type o
f device, and present an outline of our collaboration. (C) 1998 Americ
an Institute of Physics.