Public surveys and new instrumentation for Calar Alto Observatory

The Calar Alto observatory (CAHA) is a key institution for the international astronomical community, for its highly competitive astronomical facilities (telescopes and instrumentation). From 2019 on, the current administration of CAHA includes the Junta de Andalucía as a new partner - replacing the Max Planck Gesellschaft -, and together with the Spanish National Research Council (CSIC) these two institutions manage the operation of the observatory. The recent success of long-term observational projects already finished (CALIFA) or close to finalization (CARMENES), together with the innovative tradition in available instrumentation of CAHA, point to the necessity of a new call to the international astronomical community for scientific and technological proposals that will contribute to keep the level of excellence of the observatory. With this motivation, we are pleased to announce a workshop focused on two different subjects: 1. Public surveys to be carried out with instrumentation already available at the 3.5m telescope. These projects must require at least four observational semesters and a minimum of 20 nights per semester for completion. They might require simultaneous observations with other telescopes/instruments in CAHA or from other ground-based or space-born astronomical facilities. 2. Public surveys to be carried out with new instruments at the 2.2m and 3.5m telescopes. The impossibility to carry out these projects with the instrumentation already available at the observatory shall be justified in detail. In addition to this, the proposal must include a sketching of the characteristics of the instrumental design and telescope implementation. As in the previous case, these projects must require at least four observational semesters and a minimum of 20 nights per semester for completion.