Opening and scope of workshop

• Julian Rautenberg
• Jörg Hörandel (Radboud University Nijmegen dep. Astrophysics)

—> develop straw man design(s) for detectors and arrays to be used for (more) detailed performance studies (resolution for energy, mass, direction)

Discussion: Overview and Recommendations of the Snowmass UHECR white paper

• Fred Sarazin

Discussion: Particle physics in the context of GCOS

• Dennis Soldin

Discussion: Astrophysics in the context of GCOS

• Michael Unger

Define concrete goal of workshop, define key questions/key performance indicators what detector do we need to achieve the science goal(s)?

Brainstorming and blackboard discussions to prepare afternoon expert rounds and to set up structure of the workshop document

• all

- science case(s)
 - straw man designs - begin writing document

Discussions editing document

Brainstorming and blackboard discussions to converge on document: GCOS workshop 2022
 - concepts and ideas for the science case and a straw man design

Next steps, towards building prototypes, working groups, funding opportunities for prototypes, synergies with other initiatives