Within a global effort to understand and standardize the nitrogen-infusion and the low T bake procedure, one large grain and two fine grain single-cell cavity were treated and tested at FNAL and then send to other labs including DESY and JLab for further studies.
Within a cross-laboratory effort to understand and standardize the nitrogen-infusion and the low T bake procedure, one large grain and two fine grain single-cell cavities were treated and tested at FNAL. Subsequently they were sent to JLab and/or DESY for a cross-laboratory comparison of the RF performance and its dependence on test conditions like cooldown and the magnetic environment of the cryostat. MOTIVATION