Lawler, G.E. Bosco, F. Fukasawa, A. Li, Z. Majernik, N. Parsons, J.R. Rosenzweig, J.B. Sakai, Y. Spataro, B. Tantawi, S.G. JACoW Publishing Geneva, Switzerland 2673-7000 978-3-95450-232-5 10.18429/JACoW-NAPAC2022-TUPA80 English 512-515 gun cathode cavity cryogenics simulation Contribution to a conference proceedings 2022 2022-10 https://doi.org/10.18429/JACoW-NAPAC2022-TUPA80 https://jacow.org/napac2022/papers/tupa80.pdf Xray free electron laser (XFEL) facilities in their current form are large, costly to maintain, and inaccessible due to their minimal supply and high demand. It is then advantageous to consider miniaturizing XFELs through a variety of means. We hope to increase beam brightness from the photoinjector via high gradient operation (>120 MV/m) and cryogenic temperature operation at the cathode (<77K). To this end we have designed and fabricated our new CrYogenic Brightness-Optimized Radiofrequency Gun (CYBGORG). The photogun is 0.5 cell so much less complicated than our eventual 1.6 cell photoinjector. It will serve as a prototype and test bed for cathode studies in a new cryogenic and very high gradient regime. We present here the fabricated structure, progress towards commissioning, and beamline simulations.