Using a two-dimensional electromagnetic and relativistic particle-in-cell (PIC) code, we show that high-frequency electromagnetic waves can be emitted by the plasma maser from Langmuir waves generated by cold electron beam instability in pair plasmas. It is confirmed that the presence of a magnetic field is essential for the plasma maser mechanism.

The detailed analysis of plasma maser interaction between high-frequency electromagnetic waves with right-handed polarization (R mode) and electrostatic Langmuir waves excited by an electron beam is presented. The analysis shows that generation of R-mode radiation near 2ωpe is possible only for magnetized plasmas; here ωpe is the electron plasma frequency. Simulations using a two-dimensional electromagnetic and relativistic particle code show that high-frequency electromagnetic waves with right-handed polarization (R mode) can be generated by a plasma maser mechanism from electrostatic Langmuir waves excited by an electron beam.

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