On March 11, 2025, we began scientific commissioning. During the APS shutdown to replace the storage ring, we also rebuilt the GM/CA beamlines. The X-ray beam is very small and extremely bright!
On November 25, 2024, we received permission to begin technical commissioning of the new optics and endstation instruments with X-rays for GM/CA@APS beamlines. Technical commissioning of beamline 23-ID-B began immediately. An intense, focused sub-micron beam was achieved, and before the APS shutdown (December 19 - January 26), we began testing as many components as possible. Just before the shutdown, we performed "heroic" experiments under manual conditions and obtained high-quality electron-density maps (see below). The current focus is on transitioning from these proof-of-principle experiments to user-friendly beamline operability as soon as possible. This is a complex process because we replaced many outdated or end-of-life components on the beamline, including the focusing optics, the beam-delivery system, the goniometry, and the low-level hardware and software that drives all motions on the beamline and the data acquisition system. See this website for future announcements.
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Figure:
Left: trypsin (1.0-Å resolution, 50µm beam, 20 keV X-rays).
Right: crambin (0.7-Å resolution, 1µm beam, 20 keV X-rays).
2Fo-Fc density (blue) is contoured at 1.0 σ for trypsin and 1.5 σ
for crambin, and Fo-Fc density at 3 σ for both in green (+) and red (-).
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GM/CA @ APS
