PITMinutes 10-07 and 14-2019
M. Aiken, R. Bachimanchi, K. Baggett, J. Benesch, E. Daly, M. Drury, B. Freeman, C. Hovater, J. Grames, C. Ginsburg, A. Kimber, G. Krafft, R. Michaud, C. Mounts, R. Nelson, T. Plawski, T. Powers, Y. Roblin, M. Spata, A. Solopova, S. Suhring, M. Tiefenback, and P. Vasilauskis.
Agenda and Notes
1. Extended PIT Meeting (Resumption of Operations)
1:00 Goal for Meeting (Ginsburg)
1:10 Experiment Requirements and Desires for next running periods (HALL APLs, Grames)
Comments: Clyde has lobied for, and a scheduled test will be performed have early running at 300 muA. This will stress the cavities under the maximum near-term load. A High current (150 muA) 1 pass running. Not too much stress! 30 muA to C is a target max. This 5-pass summed with A is 300 muA. A could run at lower energy with benefit. High current parity quality. trip interaction with target not bad. Question, stability of the match into hal depends on the gradient distribution. Two hours up to several days to correct. Can pre-prepare matches. 10.6 GeV needed to get beyond a physics threshold. 10.5 not good enough. energy in slide. Target faults.
Camille requested a "similar" requirements table be provided for all Halls. Here is a tech note from 31 March 2018 summarizing expected requirements for all Halls at the time
1:25 Performance Expectations in Relocated Modules (Drury)
1:50 RF Configuration after SAD (Hovater)
Comments: Expectations for NL07 gradient 35-40 MeV energy gain from meeting discussion. This means a net gain of 25-30 MeV. NL07 will have new LLRF system (LCLS-II like). Gradients, from an RF point of view, are likely not limited at low average current. Because of power limitations at high current (the near-term program max is 300 muA total average current), the cavities running above about 10 MV/m may have to be turned down. This effect included in energy estimate above.
Second Day of Meeting on 10-14-2019
1:30 Gradient Choice at Turnon (Benesch)
1:40 Present Gradient Limitations (Drury)
1:50 Running the Cavities at Turnon (Mounts)
2:20 Gradient Change Instructions for OPS (Solopova)
2:40 Normal Conducting Systems (Plawski)
3:00 Energy Reach (Baggett)
3:15 CEBAF Performance Plan (Michaud)