The LCLS-II undulator phase shifter is a variable gap, pure permanent magnet (PPM) device. The phase shifter is used to correct and maintain phase between the LCLS-II electron beam and electromagnetic (radiation) field. SLAC has developed two magnet assemblies, each arranged in a 7-magnet Halbach configuration, for use in the HXR and SXR beam lines. The magnetic material shall be NdFeB, with magnets installed in a common holder with lateral and longitudinal adjustment capability for each magnet. Shims are to provide vertical magnet adjustment. The drive system utilizes a Servomotor to vary the magnetic gap, which is in turn monitored by an absolute encoder. The device must fit within a strict space envelope and have features to provide 6 degree-of-freedom (DOF) adjustment. Phase shifters must be delivered fully assembled, tuned, and fiducialized.

Requirement will be for 1 prototype, and upon approval, Options of a production run of 20 SXR's and/or 31 HXR's each.

• Minimum gap = 10 mm

• Maximum gap = 100 mm

• Gap height accuracy = +/- 28 µm

• Minimum gap repeatability = 16 µm

• Maximum gap change velocity = 10 mm/s

• Gap encoder accuracy = 4 µm

• Gap encoder resolution = 2 µm

• Overall device adjustment resolution = 25 µm (all three principal DOF)

• Approximate magnetic force at minimum gap = 190 lbf

• Approximate magnetic force at maximum gap = 0 lbf

• Magnetic axis fiducialization accuracy, lateral = 330 µm

• Magnetic axis fiducialization accuracy, vertical = 70 µm

Do not propose any pricing to this posting, this is a source sought by posting only.

 

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