Tuning the ultralow <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>β</mml:mi><mml:mo>*</mml:mo></mml:msup></mml:math> optics at the KEK Accelerator Test Facility 2
Physical review. Accelerators and beams