GeminiFocus April 2019 - Page 16

Figure 1. Computer-aided design rendering of the vacuum chamber and cameras on the MAROON-X bench. The actual spectrograph is expected to arrive at Gemini North in May. with Acting GNAO Project Manger Stephen Goodsell during the Conceptual Design Stage, allowing Stephen to step back from the role after the Conceptual Design Review. Preparations for MAROON-X MAROON-X is the new radial velocity spec- trograph being built at the University of Chicago and expected to be deployed at Gemini North within the next year (Figure 1). This high-resolution, bench-mounted spectrograph has been designed to deliver 1 meter/second radial velocity precision for M dwarfs down to and beyond Vā€†=ā€†16, and is expected to have the capability to detect Earth-size planets in the habitable zones us- ing the radial velocity method. Following the success of the Front End com- missioning, we are planning to install and align the spectrograph in the dedicated en- closure in the Pier Lab in May 2019. If all goes well, we hope to complete commissioning in time to include this exciting new visiting instrument in the 2020A Call for Proposals. 14 GeminiFocus Watch this space for more information as in- tegration and commissioning progresses on Maunakea. Second On-sky Testing of GHOST The Gemini High-resolution Optical Spec- Trograph (GHOST) team completed the sec- ond round of on-sky testing at Gemini South in November, 2018. The team successfully demonstrated proper operation of the at- mospheric dispersion correctors (ADCs), the instrument on the side-port of the instru- ment support structure, and the interactions between GHOST and the Observatory Con- trol System (OCS) software. GHOST uses ADCs to correct for the disper- sion of light by the atmosphere. Rather than a full-field ADC, GHOST features mini-ADCs for each fiber positioner, which offers im- proved efficiency. The build team tested each of the mini-ADCs to ensure that the hardware and software were working cor- rectly to provide the optimal dispersion cor- rection as expected. Each ADC was tested April 2019