NSLS Insertion Devices | VISA Undulator

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Insertion Devices - VISA Undulator

Demonstrate SASE gain to saturation at 600-800 nm
Operate with ATF linac beam (72-85 MeV)
Fit in available space in ATF -- 4 m long
Must achieve gain length of <0.4 m
Must control e-beam walk-off to < 50 mm
Need strong focusing
Need ultra-precise alignment techniques

VISA Magnetic Structure

Halbach-type Pure-Permanent Magnet Undulator with Distributed Strong Focusing

VISA

VISA Undulator Properties
Undulator magnet length [m]	4
Undulator type	Planar permanent magnet
Magnet material	NdFeB
	40 mm x 10 mm x 4.45 mm
Thickness of magnet block (z) [mm]	4.45 � 0.05
Length of magnet block (x) [mm]	30 � 0.1
Height of magnet block (y) [mm]	10 � 0.1
Separation between magnet blocks [mm]	0.05 � 0.025
Total Number of magnet blocks	1760
Undulator period l_w[mm]	18
Full gap g [mm]	6
Undulator field B_max [T]	0.75
Undulator parameter K	1.26
a_w	0.89
Number of periods per segment	55
Number of segments	4
segment magnet length [m]	0.99
Number of periods N_w	220
Wiggle plane	horizontal

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