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LCLS Conceptual Design Report - Stanford Synchrotron Radiation ...

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A.4 Undulator<br />

A.4.1 Undulator<br />

A.4.1.1 Undulator Magnet<br />

L C L S C O N C E P T U A L D E S I G N R E P O R T<br />

Parameter Name Low Energy High Energy All Energies Unit<br />

Undulator type planar hybrid undulator<br />

Magnet material NdFeB<br />

Magnet block dimensions (h, t, w) 66 mm × 9 mm × 56.5 mm<br />

Permeable material Va Permendur<br />

Pole block dimensions (h, t, w) 44 mm × 6 mm × 48 mm<br />

Undulator period 30 mm<br />

Full gap 6 mm<br />

Nominal undulator field 1.325 T<br />

Nominal undulator parameter 3.711<br />

Linear field taper 0.2 %<br />

Number of magnet blocks per jaw 225<br />

Number of pole blocks per jaw 226<br />

Segment magnet array length 3.381 m<br />

Segment end piece length 0.0195 m<br />

Segment device length (w/ end pieces) 3.42 m<br />

Number of segments 33<br />

Overall device length (w/o breaks) 112.860 m<br />

Overall device length (w/ breaks) 121.045 m<br />

Number of periods 3729<br />

Break length between segments 1 and 2 0.281 m<br />

Break length between segments 2 and 3 0.256 m<br />

Break length between segments 3 and 4 0.473 m<br />

Regular short segment break length 0.187 m<br />

Regular long segment break length 0.421 m<br />

Break pattern after segment 4 short-short-long<br />

Wiggle plane horizontal<br />

P A R A M E T E R T A B L E S♦ A-17

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