A wide-band travelling-wave maser

The bandwidth of a Travelling Wave Maser (T.W.M.) is limited primarily by the width of the resonance line employed at the signal frequency. If neither the orientation of the paramagnetic crystal with respect to the external magnetic field nor the magnitude of the field vary along the length of the T.W.M. then it is found [l] that the bandwidth to half power points is 1<math display='block'> <mrow> <mi>B</mi><mo>=</mo><mfrac> <mn>1</mn> <mrow> <mi>&#x03C0;</mi><msub> <mi>T</mi> <mn>2</mn> </msub> </mrow> </mfrac> <msqrt> <mrow> <mfrac> <mn>3</mn> <mrow> <msub> <mi>G</mi> <mi>o</mi> </msub> <mo>&#x22C5;</mo><mn>3</mn> </mrow> </mfrac> </mrow> </msqrt> </mrow> </math>$$B = \frac{1}{{\pi {T_2}}}\sqrt {\frac{3}{{{G_o} \cdot 3}}} $$