Next Meeting
Attendees
J. Bennett, S. Benson, J. Bisognano, C. Bohn, J. Delayen, D. Douglas, M. Drury, F. Dylla, D. Engwall, C. Hovater, K. Jordan, G. Krafft, R. Legg, R. Li, L. Merminga, G. Neil, P. Piot, R. Walker; R. Oepts (FOM, Netherlands)
Addenda/Errata to Previous Minutes
Items of Discussion
C. Bohn also presented the current lists of commissioning tasks, principal investigators (PIs), and system owners. They are the same as the ones developed and discussed in August, with the following exceptions: (1) G. Neil is lead PI for lasing, (2) D. Engwall will join full-time beginning 16 Oct 97 and will participate broadly in commissioning, (3) C. Hovater is added to the RF Tune Teamlet, and (4) R. Legg is Injector System Owner. We are in process of assigning people to staff the shifts from now to Christmas, and staffing will be consistent with these lists. Other people will also be included as necessary, such as software people, for example. Legg will present the results of this activity at the next meeting. An open question is how to define the role of the performance integrators in this context. Bohn will ponder the question and seek advice.
The interested reader (if any) can obtain charts, materials, and memos concerning these matters from Bohn.
P. Piot then presented the methodology that he and D. Douglas have put together for doing emittance measurements in support of CSR experiments. His slides can be viewed on the www at http://www.cebaf.gov/~piot. Piot plans to rely principally on the multimonitor and quad-viewer techniques that have been proven on the main machine. The method should yield the projected rms transverse emittance to about 10% accuracy. This makes it possible to pinpoint a serious problem in the optical chicane, as well as resolve significant emittance growth in the first recirculation bend. A point was raised that care is needed in defining phase-space volume during the measurement because the beam bunch will almost surely be far from gaussian. It also was pointed out that beam halo can be readily observed by running the beam through a viewer with a hole. These two remarks fell in context with a general observation that a tomographic reconstruction of the beam bunch's four-dimensional phase space would be most desirable. Piot said the software for doing this is not being worked, but he will discuss its development with J. Song, who has experience with this type of code. Otherwise, Piot reported that the necessary software is a straightforward extrapolation from Dunham's code and is already available. He still needs to test the revised software and will do so once the FEL model server is brought up.
New Issues
Action Items
Action Priority Items (assigned)A-15 1 Commissioning Procedure Legg 7/16/97 A-19 0 Web Documentation weekly A-34 2 Consistent Linac phasing plan Yunn A-44 1,2 Start Rui, Jinhu? on emittance code Douglas 8/13/97 Action Items (pending)
P-05 1 Devise fine-tuning procedure for buncher gradient Legg P-08 1,2 How do we change energy? What is the energy range? Benson P-20 1 Lock plans (who in particular) Johannes? P-21 1 Save/restore plans Benesch P-25 1,2 RF control sensitivities/ Merminga Microphonics Diff for FEL/ Pathlength effect P-29 2 FEL/linac interaction Merminga Agenda for Next Meeting
Item Person Responsible Time ---- ------------------ ----- Review of Minutes/Errata All 5 min Manpower for 1Q98 Commissioning Legg 15 min Methodology for Gradient Calibration with Beam Merminga 20 min New Issues All 10 min Agenda for next week All 5 min