Optical transition radiation used in the diagnostic of low energy and low current electron beams in particle accelerators.

Optical transition radiation (OTR) plays an important role in beam diagnostics for high energy particle accelerators. Its linear intensity with beam current is a great advantage as compared to fluorescent screens, which are subject to saturation. Moreover, the measurement of the angular distribution of the emitted radiation enables the determination of many beam parameters in a single observation point.

Developing 152Eu into a standard for detector efficiency calibration.

A gamma-gamma coincidence experiment was performed to check the 152Eu 13-year decay scheme and the placement of the observed gamma-ray transitions. The multi-detector array for residual activity measurement of the Linear Accelerator Laboratory was used. The source activity was 1 MBq, and about 10(9) coincidence events were observed.

The interplay between the statistical correlations of gamma-ray emission probabilities and efficiency calibration.

The procedure to determine the statistical correlations between gamma-ray intensities is described here, as well as that required to take these correlations into account. The advantages of using branching-ratios and feeding fractions instead of gamma-ray intensities in the gamma-ray standards are discussed.