Journal
JOURNAL OF SYNCHROTRON RADIATION
Volume 12, Issue -, Pages 665-669Publisher
BLACKWELL PUBLISHING
DOI: 10.1107/S090904950501770X
Keywords
fast shutter; phase locking; photocrystallography; air bearing
Categories
Ask authors/readers for more resources
A new high-speed high-repetition- rate X-ray beam shutter for time-resolved photocrystallography at synchrotron sources has been developed and tested. The new design is based on a commercially existing DC servomotor and a frequency-lock control capable linear amplifier. Accurate speed control combined with an air bearing results in extremely low jitter in the motor rotation. Measured jitter at rotation speeds of 12000 to 30000 r min(-1) is less than 2 ns at a 6 sigma confidence level. The chopper disc is interchangeable, allowing maximum flexibility. The chopper disc currently installed has 45 radial slots which allows synchronization from the 12th to the 20th subfrequencies of the orbit frequency of the Advanced Photon Source storage ring, corresponding to X-ray pulse frequencies of 13.6 to 22.6 kHz. At 30000 r min(-1) the opening time window with a 350 mm slot size is 2.11 mu s, and correspondingly less with smaller openings, which may be compared with the 3.68 mu s orbit time of the Advanced Photon Source. The shutter provides high accuracy and efficient use of X-rays at a modest cost.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available