TY - RPRT TI - The magnetic gradient scale length explains why certain plasmas require close external magnetic coils AU - Kappel, John (ORCID:0009000609682556) AU - Landreman, Matt (ORCID:000000027233577X) AU - Malhotra, Dhairya (ORCID:0000000195671322) PY - 2024 DO - 10.1088/1361-6587/ad1a3e UR - https://www.osti.gov/biblio/2281754 ID - 2281754 ER -