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The Horizontal Test System (HTS) at Fermilab is currently testing fullyassembled, dressed superconducting radio frequency (SCRF) cavities. Thesecavities are cooled in a bath of superfluid helium at 1.8K. Dissipated RF powerfrom the cavities is a dynamic heat load on the cryogenic system. The magnitudeof heat flux from these cavities into the helium is also an important variablefor understanding cavity performance. Methods and hardware used to measure thisdynamic heat load are presented. Results are presented from several cavitytests and testing accuracy is discussed.

Measurements of SCRF cavity dynamic heat load in horizontal test system