Call for regular proposals (round 2027-I) at PETRA III, DESY (Hamburg). PETRA III enters an extended shutdown from September 2026 until spring 2027; this call covers post-shutdown beamtime. Beamlines P08, P11, P22, P23 and P24 use a separate rolling (on-demand) procedure with no deadline.
Deadline: 1 September 2026, 23:59 CET. See Calls and deadlines.