A steel-scintillator counter to detect neutrons

A steel-scintillator sandwich counter was used as a simple and highly efficient detector for both neutrons and protons. The validity of simple approximations for the detection efficiency was investigated by experimental tests and a detailed Monte Carlo calculation of the nuclear and electromagnetic cascades in the counter.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/32659/1/0000024.pd

Benchmarking of electro-optic monitors for femtosecond electron bunches

The longitudinal profiles of ultrashort relativistic electron bunches at the soft x-ray free-electron laser FLASH have been investigated using two single-shot detection schemes: an electro-optic (EO) detector measuring the Coulomb field of the bunch and a radio-frequency structure transforming the charge distribution into a transverse streak. A comparison permits an absolute calibration of the EO technique. EO signals as short as 60 fs (rms) have been observed, which is a new record in the EO detection of single electron bunches and close to the limit given by the EO material properties