Ken Finkelstein Retires after 32 years at CHESS
Before he could build the wiggler at CHESS, an opportunity arose for Ken to learn how to use the first hard x-ray undulator prototype for APS. Ken participated in a month-long beam test on how to steer the beam through the undulator. "My 'particle of choice' was neutrons," says Ken, "and this was a chance for me to learn how x-rays work.”