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Analytical RF Pulse Heating Analysis for High Gradient Accelerating Structures

Daniel González Iglesias; Daniel Esperante; Benito Gimeno; Marçà Boronat; César Blanch; Nuria Fuster-Martínez; Pablo Martinez-Reviriego; Pablo Martín Luna; Juan Fuster


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    <subfield code="a">Daniel González Iglesias</subfield>
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    <subfield code="a">Analytical RF Pulse Heating Analysis for High Gradient Accelerating Structures</subfield>
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    <subfield code="a">&lt;p&gt;The main aim of this work is to present a simple&lt;br&gt;
method, based on analytical expressions, for obtaining the temperature&lt;br&gt;
increase due to the Joule effect inside the metallic walls&lt;br&gt;
of an RF accelerating component. This technique relies on solving&lt;br&gt;
the 1D heat transfer equation for a thick wall, considering that&lt;br&gt;
the heat sources inside the wall are the ohmic losses produced&lt;br&gt;
by the RF electromagnetic fields penetrating into the metal with&lt;br&gt;
finite electrical conductivity. Furthermore, it is discussed how the&lt;br&gt;
theoretical expressions of this method can be applied to obtain&lt;br&gt;
an approximation to the temperature increase in realistic 3D&lt;br&gt;
RF accelerating structures, taking as an example the cavity of&lt;br&gt;
an RF electron photoinjector and a travelling wave linac cavity.&lt;br&gt;
These theoretical results have been benchmarked with numerical&lt;br&gt;
simulations carried out with a commercial Finite Element Method&lt;br&gt;
(FEM) software, finding good agreement among them. Besides,&lt;br&gt;
the advantage of the analytical method with respect to the&lt;br&gt;
numerical simulations is evidenced. In particular, the model could&lt;br&gt;
be very useful during the design and optimization phase of RF&lt;br&gt;
accelerating structures, where many different combinations of&lt;br&gt;
parameters must be analysed in order to obtain the proper&lt;br&gt;
working point of the device, allowing to save time and speed&lt;br&gt;
up the process. However, it must be mentioned that the method&lt;br&gt;
described in this manuscript is intended to provide a quick&lt;br&gt;
approximation to the temperature increase in the device, which of&lt;br&gt;
course is not as accurate as the proper 3D numerical simulations&lt;br&gt;
of the component.&lt;/p&gt;</subfield>
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