I present recent high angular resolution (9") Sunyaev-Zel'dovich
effect (SZE) observations with MUSTANG, a 90-GHz bolometric receiver
on the 100 meter Green Bank Telescope. MUSTANG has now imaged several
massive clusters of galaxies in some of the highest-resolution SZE
imaging to date, revealing complex pressure substructure within the
hot intra-cluster gas in merging clusters. Here I focus on two
merging, intermediate redshift clusters: MACS J0744.8+3927 and MACS
J0717.5+3745. In MACS J0744.8+3927, the MUSTANG observation revealed
shock-heated gas previously undetected in X-ray (or any) observations,
while preliminary observations of MACS J0717.5+3745 confirm the
suspected shock found in X-ray and radio observations. Finally, I
discuss prospects for MUSTANG2, the proposed successor to MUSTANG with
over two orders of magnitude faster mapping speed.
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