ÿþ<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" > <html> <head> <title>Institute for ElectroMagnetic Research / Our Products / Modulated Electron Beam-Driven Generator </title> <meta http-equiv="Content-Type" content="text/html; charset=Windows-1252"> <meta name= "Description" content="Powerful microwave oscillators"> <meta name="Keywords" content="IEMR - Microwave Oscillators, MILO, MCG"> <link rel="stylesheet" href="style/institute.css" type="text/css"> </head> <body> <table width="90%"> <tr><td> <h3><a href="home_page.htm" >Home Page</a> > <a href="our_prod.htm" >Our Products</a> > Modulated Electron Beam-Driven Generator </h3> <hr> <p>Modulated electron beam-driven generator (MBG) relates to klystron-like devices by employing mildly relativistic e-beams of microsecond duration.</p> <p>A modified split-cavity oscillator is used as e-beam modulator. To ensure the efficient microwave radiation energy extraction across a broad frequency range, this option of the generator employs a custom-made de-modulator which is compatible with mode converter and antenna. </p> <p>MBG employs a coaxial-sector antenna of a proprietary configuration that provides for such angle between the generator axis and that of maximum emission that varies between 0 and 25<SUP>0</SUP>.</p> <p>As its power source, MBG can use either magnetocumulative generator (MCG) or storage capacitance. </p> <p>The general view of a MBG, as powered by storage capacitance, with the radiating antenna is given in Fig. 1. </p> <table border="0" align="center" width="80%"> <tr align="center"> <td>&nbsp;</td> <td><a href="./Figures/meb_gen_01a.jpg"><img src="./Figures/smeb_gen_01a.jpg" width="300" height="169" border="0"/></a> &nbsp; <a href="./Figures/meb_gen_01b.jpg"><img src="./Figures/smeb_gen_01b.jpg" width="165" height="300" border="0"/></a></td> <td>&nbsp;</td> </tr> </td>><td>&nbsp;</td></tr> <tr><td>&nbsp;</td><td align="center">Fig. 1. General view of modulated electron beam-driven generator: 0)  Side view; b)  View from antenna port side. </td><td>&nbsp;</td></tr> </table> <table border="0" align="center" width="80%"> <tr align="center"> <td>&nbsp;</td> <td><a href="./Figures/meb_gen_02.jpg"><img src="./Figures/smeb_gen_02.jpg" width="300" height="225" border="0"/></a></td> <td>&nbsp;</td> </tr> <tr><td>&nbsp;</td><td align="center">Fig. 2. General view of modulated beam-driven generator at lab stand. </td><td>&nbsp;</td></tr> </table> <p>Main parameters of this generator are given in Table 1</p> <h3 align="center">Table 1. Main parameters of modulated relativistic electron beam-driven generator </h3> <table border="1" align="center"> <title>Table 1. Main parameters of modulated relativistic electron beam-driven generator </title> <tr><td>&nbsp; No &nbsp;</td><td>&nbsp;Designation of characteristic&nbsp;</td><td>&nbsp; Value of characteristic&nbsp;</td></tr> <tr><td>&nbsp;1.&nbsp;</td><td>&nbsp; Generation frequency &nbsp; </td><td>&nbsp;1.5 GHz&nbsp;</td></tr> <tr><td>&nbsp;2.&nbsp;</td><td> &nbsp;Power per pulse&nbsp; </td><td> &nbsp;0.9-0.95 GW&nbsp;</td></tr> <tr><td>&nbsp;3.&nbsp;</td><td> &nbsp;Generation pulse width &nbsp;</td><td>&nbsp;70-80 ns&nbsp;</td></tr> <tr><td>&nbsp;4.&nbsp;</td><td> &nbsp;Directivity pattern breadth, not more than&nbsp; </td><td> &nbsp; &#177; 25<SUP>0</SUP>-27<SUP>0</SUP> at the level of 3 dB&nbsp;</td></tr> <tr><td>&nbsp;5.&nbsp;</td><td>&nbsp; Mode of operation&nbsp; </td><td> &nbsp;Single pulses; bursts containing 2-4 pulses &nbsp;</td></tr> <tr><td>&nbsp;6. &nbsp;</td><td>Supply voltage</td><td> 400-450 kV</td></tr> <tr><td>&nbsp;7.&nbsp; </td><td>&nbsp;Generator s length&nbsp;</td><td> &nbsp;Not more than 870 mm&nbsp;</td></tr> <tr><td>&nbsp;8.&nbsp; </td><td>&nbsp;Generator s diameter&nbsp;</td> <td>&nbsp;Not more than 250 mm&nbsp;</td></tr> <tr><td>&nbsp;9.&nbsp; </td><td>&nbsp;Power source type&nbsp;</td><td> &nbsp;MCG, storage capacitance&nbsp;</td></tr> </table> </td></tr></table> <table border="0" align="left" width="90%" > <tr><td> <hr> </td></tr> <tr><td align="center"> <a href="information.htm" target="mainFrame" >Information about IEMR</a> &nbsp; <a href="departments.htm" target="mainFrame" >Departments</a> &nbsp; <a href="our_prod.htm" target="mainFrame" > Products</a> &nbsp; <a href="our_res.htm" target="mainFrame" > Research Projects </a> </td></tr> <tr><td align="center"> <a href="http://www.emph.com.ua" target="_blank" >Electromagnetic Phenomena Journal</a> &nbsp; <a href="Address.htm" target="mainFrame" >Contact us </a> </td></tr> </table> </body> </html>