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<p>and its wear due to particle flow over it. Another design proposes to use a spiral ramp over which particles flow due to the combined effect of the <a href="page.php?w=Gravity">gravitational force</a> and mechanically induced <a href="page.php?w=vibration">vibration</a>s. Tests showed that it is possible to reach particle temperature of 650&nbsp;°C and thermal efficiency of around 60%. However, this design requires beam-down optics that would result in additional optical losses, and significant particle flow could be difficult to obtain using</p><p>
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