Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurements of SCRF cavity dynamic heat load in horizontal test system   The Horizontal Test System (HTS) at Fermilab is currently testing fully
assembled, dressed superconducting radio frequency (SCRF) cavities. These
cavities are cooled in a bath of superfluid helium at 1.8K. Dissipated RF power
from the cavities is a dynamic heat load on the cryogenic system. The magnitude
of heat flux from these cavities into the helium is also an important variable
for understanding cavity performance. Methods and hardware used to measure this
dynamic heat load are presented. Results are presented from several cavity
tests and testing accuracy is discussed.

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The categories of this paper are: math
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ph
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The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: gr-qc