Fast excitation variable period wiggler Page: 3 of 6
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X, =» 23.5 mm., is shown in Fig. 7. In this case also, the
harmonic content (harmonic and non-suusoidal content) of the
central section of the wiggler models was measured and found
to be acceptably small.
m. Summary and conclusions
It is evident from the foregoing that fast excitation driven,
laminated Vanadiurn-PerrnanHnr wiggiers or undulators, with
periodic interleaving of conductive 'field reflectors*, can
provide state of the an (in terms of B(max) vs \Jg) wiggiers
or undulators, which may be optimum for specific applica-
tions, such as, for example, the IFEL accelerator mndnla, for
which a tapered period length is required.
It is worthwhile to note that similar maTimmn field on axis
versus \J g enhancement as achieved here for the fast excita-
tion wiggler, should be obtainable for a dc electromagnetic
wiggler or permanent magnet wiggler with the periodic
interleaving (KJ2 separation) of superconducting field exclu-
sion sheets*. The possible maTimmri enhancement achievable
in this case is given by the limiting value of B^coshf
with f =» (xg/XJ [71, i.e. malting use of periodic supercon-
ducting 'field reflectors* could, for example, for the case of
a X,/g value =■ 3, yield a factor of two enhancement in the
wiggler B^, versus \Jg value, when compared with a room
temperature hybrid SaCo,-VaP.
Taking advantage of inherent symmetry, the fast excitation,
Cu sheet interlaced, undulator/wiggler can be constructed in
the form of a passive septum bounded periodic magnet ,
As such, it may find also application as a small gap, large
number of periods, undulater in conjunction with a storage
ring without the need for a bypass configuration.
 C. Pellegrini, P. Sprangle, W. Zakowicz, Intern. Conf. on He
P] E. Courant, C. Pellegrini, W. Zakowicz, Phys. Rev. A 32.
P] E. Courant, J. Sandweiss, BNL Report 38915.
 A. van Steenbergen, in Exp. Progr., ATF, BNL 42664, 1988;
and "IFEL Accelerator Demonstration Stage,* ATF, BNL 43702,
 A. van Steenbergen, J. Gallardo. T. Romano, M. Woodle, "Fast
Excitation Wiggler Development," Proc. Workshop 1 Angstrom
FEL. Sag Harbor, NY, 1990, Editor J. Gallardo, p.79, BNL
 A. van Steenbergen, Patent Application 368618, June 1989
(issued August 1990).
 K. Halbach, priv. comm.. Workshop 1 Angstrom FEL, April.
“Note added in proof; The suggested use of periodic located
superconducting laminations in a dc electromagnetic wiggler is
mentioned by R. Tatchyn, et al. in the Proc. Workshop "PEP as a
Synchrotron Radiation Source”, SSRL, p. 229, Oct. 1987.22
Erct. ACCELERATOR DEMONSTRATION STAGE
T « 1, vi :
(B - constant accelerator. S^wijgier) » '..25 T.]
[Dleleemc coated jmde laser eanspott. a » 0.0S m'']
[ 7,w » I-* 10» - L, expHCRC,) - tf1]
<u cu a;- o-t a.; q.7 m
Computed 2D Field Disiribnooa (Sirifwmwn io tA)
Fast Excitation Variable Period Wiggler
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van Steenbergen, A.; Gallardo, J.; Romano, T. & Woodle, M. Fast excitation variable period wiggler, article, January 1, 1991; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc1102869/m1/3/: accessed January 18, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.