SPEAR3 is a third-generation synchrotron light source at SLAC.

SPEAR3 uses three iGp12-372F for transverse feedback and vertical instability interlock. Vertical instability interlock is required for protecting in-vacuum undulators when the gaps are closed.

In the winter-spring of 2021, a successful demonstration of LLRF9/476 was performed in SPEAR3 RF system, demonstrating RF station operation without and with beam.