PETRA III runs at full speed

Status monitor of PETRA III: the facility runs for days at a constant current of 100 mA.

Last week, PETRA III was running with a beam current of 100 milliamperes (mA) during user operation for the first time. With this, the brilliant synchrotron radiation source has reached the final stage of its design values. “The PETRA III positron beam now simultaneously reaches all of our sophisticated beam parameters of emittance, beam current and beam position stability,” explains Klaus Balewski from the DESY accelerator division.

A total of 240 positron bunches, combined to groups of four, rush through the 2.3-kilometre ring, each at 130 000 times per second. Top-up operation keeps the beam current on a constant level of one percent for days, ranging between 99 and 100 milliamperes, now uninterrupted for more than 70 hours.

„Of course, the users are very happy to fully exploit the extraordinary light quality of PETRA III for their experiments”, says experiment coordinator Hermann Franz.

This week, the upgrade of two additional beamlines has been concluded, so that after the PETRA III service week, 9 of 14 PETRA beamlines will be in operation. Currently, three beamlines are available for regular user operation.

Right now, the evaluation of the applications for the next user run has come to an end. Starting in March, after a planned winter shutdown, about 50 user groups will have the opportunity to experiment at five PETRA beamlines.