Abstract
An x-ray beam position monitor (XBPM) prototype that can be operated in pulse mode has been designed and demonstrated. The monitor has a microstripline structure for signal transmission lines and a titanium electrode sputtered on a diamond heat sink as a photocathode. The detection elements of this monitor generate unipolar single pulses with a full width at half maximum of less than 1 ns, allowing a pulse-by-pulse measurement of the synchrotron radiation beam. By synthesizing these pulses, a directly readable position sensitive signal is provided from pulse to pulse. This monitor can be used in the direct current mode in which it exhibits a stability and resolution as good as those of conventional XBPMs. Results of the performance tests of the monitor at the SPring-8 synchrotron radiation beam line are also presented.
Highlights
X-ray beam position monitors (XBPMs) are widely used tools to provide information on the photon beam position and pointing stability in the front end in a synchrotron radiation facility
Operating in the dc mode, the existing conventional XBPMs in the SPring-8 constantly monitor the short- and long-term photon beam positions, and the beam vibration, typically, at frequencies lower than 500 Hz. This pulse-mode monitor is optimized for pulse-mode measurements, it can be used in the dc mode similar to conventional XBPMs
We have designed and manufactured a pulse-mode XBPM prototype using diamond heat sinks aiming to use it in the insertion device beam lines (ID-BLs) in a synchrotron radiation facility
Summary
X-ray beam position monitors (XBPMs) are widely used tools to provide information on the photon beam position and pointing stability in the front end in a synchrotron radiation facility. In a user experiment, time-resolved measurements of the electronic properties via x-ray pulse excitation are carried out by synchronizing the SR pulse with a wideband pulse laser by using pump-probe techniques.
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