Schematic of the Compton scattering process. All the parameters are given in the laboratory frame. Here, and are the kinetic energies of incident and scattered electron, and are the energies of incident laser photon and LCS x-ray, and and are the incident angle of laser photon and scattered angle of LCS x-ray with respect to the direction of incident electron beam, respectively.
LCS experimental setup.
Amplitude of electron macropulse current monitored by WCM as a function of time.
Electron macropulse width (rms) monitored by WCM as a function of time. The average value of electron macropulse width (rms) is 0.95 ns.
Laser pulse amplitude monitored by as a function of time. The line is the mean value of laser pulse amplitudes. The unstability is estimated to be (The unstability is defined as the ratio of one sigma deviation of mean value to mean value.)
Laser pulse width (FWHM) monitored by EPM1000 as a function of time. The line is the average value of laser pulse width (FWHM) measured to be 21.2 ns.
X-ray spectrum of source. Three x-ray peaks of radioactive are 27.47, 31.0, and 35.46 keV, respectively.
Spot images of an electron beam (left) and a He–Ne laser beam (right) at the center of the LCS chamber (interaction point).
Layout of synchronization between Nd:YAG laser pulse and electron macropulse. Both M1 and M2 are eight-channel programmable pulse generators. M1 runs with a repetition of 5 Hz and provides TTL trigger signals to the following devices: (1) Electron gun, (2) Nd:YAG laser, and (3) M2. M2 provides an pretrigger signal to Nd:YAG laser. Oscillograph (TDS 7104) and its LABVIEW program are used to monitor and record the relative time difference between laser pulse and electron macropulse.
Time difference between Nd:YAG laser pulse and electron macropulse measured by the oscillograph as a function of time. The error bar includes systematic error and statistical error.
A cartoon picture of working modes of the LCS experiment.
The measured LCS x-ray spectrum. The histogram labeled by laser on (solid line) is LCS x-ray signals including background radiation. The histogram labeled by laser off (dashed line) is mainly background radiation. The inserted histogram labeled by is the LCS x-ray spectrum after background subtraction.
Schematic view of the collision between laser and electron beam. In the 42° interaction scheme, is dependent on the electron beam waist size and laser incident angle with regard to electron beam.
Basic parameters of the Si(Li) detector.
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