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| | == Attendance == | | == Attendance == |
| | | | |
| − | R. Bachimanchi, K. Baggett, J. Benesch, R. Geng, C. Hovater, G. Krafft, A. Kimber, F. Marhauser, C. Mounts, R. Nelson, T. Plawski, T. Powers, C. Reece, and R. Rimmer.
| + | M. Drury, G. Krafft, T. Powers, and A. Solopova. |
| | | | |
| | == Agenda and Notes == | | == Agenda and Notes == |
| | | | |
| − | 1. Operations Status and Summary/Review (Freyberger) | + | 1. Because of KeK visits and other "busyness", the meeting |
| − | | + | was only sparsely attended. The discussions postponed until |
| − | Four Hall Ops has started. Have had a rough couple weeks
| + | April 9. |
| − | as the beam average current was raised. CEBAF seems to have
| + | |
| − | an average current limit around the spec average current of
| + | |
| − | 460 muA 5 pass beam. This current has been briefly achieved,
| + | |
| − | but steady OPs at around 325 muA. BBU looked for but none
| + | |
| − | obviously present. Much optics work has cleaned up beam and
| + | |
| − | made more substantial apertures, but the average current limitation
| + | |
| − | remains. OPS trip rates now dominated by RF trips.
| + | |
| − | | + | |
| − | C75 Review completed. Will post review report when available.
| + | |
| − | | + | |
| − | RF separators seem to have settled down. circulator loads unstable.
| + | |
| − | Recovery reboot?
| + | |
| − | | + | |
| − | 2. Beam Loading and Q_ext (Krafft)
| + | |
| − | | + | |
| − | Jay has gathered some data that indicates that perhaps
| + | |
| − | the Q_ext on many cavities is incorrect. This means the
| + | |
| − | RF systems are not matched to the cavities at the highest
| + | |
| − | operating currents, leading to addition power loads on
| + | |
| − | the klystrons. Could this be a contributor to the average
| + | |
| − | current limits?
| + | |
| − | | + | |
| − | [https://casa.jlab.org/LINACPIT/Full_Power_Test_Note_98-009.pdf Full Power Test Note]
| + | |
| − | | + | |
| − | [https://casa.jlab.org/LINACPIT/Optimal_Qext.ppt Presentation on Optimal Qext]
| + | |
| − | | + | |
| − | [https://casa.jlab.org/LINACPIT/ced_20feb2018.txt CED All Qs list]
| + | |
| − | | + | |
| − | [https://casa.jlab.org/LINACPIT/RF_Power_C75.xlsx Xcel with power calculations]
| + | |
| − | | + | |
| − | 3. C100 Refurbishment Planning (Freyberger)
| + | |
| − | | + | |
| − | Jay has gathered some data that indicates that perhaps
| + | |
| − | the Q_ext on many cavities is incorrect. This means the
| + | |
| − | RF systems are not matched to the cavities at the highest
| + | |
| − | operating currents, leading to addition power loads on
| + | |
| − | the klystrons. Could this be a contributor to the average
| + | |
| − | current limits?
| + | |
| − | | + | |
| − | [https://casa.jlab.org/LINACPIT/Optimal_Qext.ppt Presentation on Optimal Qext]
| + | |
| − | | + | |
| − | [https://casa.jlab.org/LINACPIT/ced_20feb2018.txt CED All Qs list]
| + | |
| − | | + | |
| − | [https://casa.jlab.org/LINACPIT/RF_Power_C75.xlsx Xcel with power calculations]
| + | |
| − | | + | |
| − | 3. Draft Cryomodule Specification (Benesch)
| + | |
| − | | + | |
| − | Jay has written up a set of goals for the cryomodules:
| + | |
| − | [https://casa.jlab.org/LINACPIT/2017CM_specR2.pdf Draft Cryomodule Specification]
| + | |
| − | | + | |
| − | 4. Draft Acceptance Criteria (Legg)
| + | |
| − | | + | |
| − | Bob shared the LCLS II module acceptance criteria that the
| + | |
| − | LCLS II project is working under. We should perhaps adopt something
| + | |
| − | similar for C75? (Discuss Pros and Cons)
| + | |
| − | | + | |
| − | [https://casa.jlab.org/LINACPIT/Acceptance_criteria.pptx LCLS II Module Acceptance Criteria]
| + | |
| − | | + | |
| − | Frank and Gigi (mainly) have written up a C75 performance specification
| + | |
| − | document.
| + | |
| − | | + | |
| − | [https://casa.jlab.org/LINACPIT/2017-11-22_Draft_3.0.pdf JLAB-TN-17-055: Draft C75 Specification Document]
| + | |
| − | | + | |
| − | == Action Items ==
| + | |
| − | | + | |
| − | Leadership of quenches. Offline discussion.
| + | |
| − | | + | |
| − | Complete C75 Module Specifications (Marhauser, Benesch, Krafft)
| + | |
| − | | + | |
| − | C100 Refurbishment Project for the future?
| + | |
M. Drury, G. Krafft, T. Powers, and A. Solopova.
1. Because of KeK visits and other "busyness", the meeting
was only sparsely attended. The discussions postponed until
April 9.
