The introduction to Launch Window Trade Analysis for the James Webb Space Telescope reads:
The James Webb Space Telescope (JWST) is a large-scale space telescope mission designed to study fundamental astrophysical questions. General topics include studying the assembly of galaxies, planetary systems / origin of life, birth of stars / proto-planetary systems and the concept of first light / re-ionization. One of the primary trade analyses for JWST determines when the observatory can successfully launch. This is traditionally called the launch window trade analysis.
This paper presents the first launch window analysis for JWST with the inclusion of higher fidelity propulsion finite-burn modeling. Significant requirements affecting the JWST orbit design are the overall Libration Point Orbit (LPO) size, the avoidance of any Earth/Moon eclipses, and propulsion/other hardware restrictions. This launch window trade analysis focuses on meeting these requirements and finds feasible epochs to launch the JWST observatory under these conditions. The paper first presents an in-depth view of the JWST mission with emphasis on the requirements and constraints affecting the launch window analysis. The full trade study is then described alongside its methodology. Finally, results that observe the overall nature of the launch window with the updated JWST models are presented with final conclusions and future development.
The 2014 presentation James Webb Space Telescope Launch Window Trade Analysis by Wayne Yu (NASA GSFC) and Karen Richon (NASA GSFC) 5 May 2014, 24th International Symposium on Space Flight Dynamics (ISSFD) includes the following slide with the text
Over a single launch day, the JWST orbit launch time is critical to its success. The allowable daily launch window exists within the launch window trade space of 11:30 – 14:00 UTC.
Question: What is "trade space" in the context of libration orbit mission design? (used in trade analysis and trade study)