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We present a systematic study of the effects of shielding on the internalquality factors (Qi) of Al and TiN microwave resonators designed for use inquantum coherent circuits. Measurements were performed in an adiabaticdemagnetization refrigerator, where typical magnetic fields of 200 {\mu}T arepresent at the unshielded sample stage. Radiation shielding consisted of 100 mKand 500 mK Cu cans coated with infrared absorbing epoxy. Magnetic shieldsconsisted of Cryoperm 10 and Sn plating of the Cu cans. A 2.7 K radiation canand coaxial thermalization filters were present in all measurements. TiNsamples with Qi = $1.3*10^6$ at 100 mK exhibited no significant variation inquality factor when tested with limited shielding. In contrast, Al resonatorsshowed improved Qi with successive shielding, with the largest gains obtainedfrom the addition of the first radiation and magnetic shields and saturatingbefore the addition of Sn plating infrared absorbing epoxy.

Optimization of infrared and magnetic shielding of superconducting TiN and Al coplanar microwave resonators