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Storage-ring-based, ultrashort positron beam source
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Image of FIG. 1.
FIG. 1.

(a) A -ray spectrum peaked at . (b) The total flux as a function of the peak photon energy. An acceptance angle of is used in the calculation, where is the relativistic factor of the beam. The crossing angle is . In (b), the peak photon energy is tuned by changing the interaction angle between the laser and the electron beam. Here a laser repetition rate of and an optical cavity with a quality factor of 1000 at are considered.

Image of FIG. 2.
FIG. 2.

(Color online) Electron loss as a function of -ray photon energy and the radiation probability per turn. Note the thresholdlike behavior at photon energy of about .

Image of FIG. 3.
FIG. 3.

(Color online) Total, trapped, and emitted positron yields per photon as functions of target length by EGS4 Monte Carlo simulation. The calculation is for the spectrum in Fig. 1(a).

Image of FIG. 4.
FIG. 4.

(Color) Positron spectrum as a function of time, calculated by EGS4 Monte Carlo simulation. The calculation is for the spectrum in Fig. 1(a) with a tungsten target. The intensity scale is relative.


Generic image for table
Table I.

Advanced Photon Source Beam parameters and the laser pulse parameters.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Storage-ring-based, ultrashort positron beam source