Next Meeting

Date: September 2, 1997

Time: 3:00 - 4:00

Place: Bldg 89, Large Conference Room

Attendees

R. Legg, D. Douglas, K Jordan, F. Dylla, G.A.Krafft, L. Merminga, G. Biallas

Addenda/Errata to Previous Minutes

• None.

Items of Discussion

• D. Douglas gave an update to the Magnet Performance Integration Plan. It is presently on version 1.90 with release scheduled at ver. 2.0. The document presently has 9 sections and 7 levels and is 80% complete. Dave went on to explain that the document also defines when the task is complete. After the overview of the plan, we discussed the DW's, an application of the plan. The DW's meet several of the field specs, but 3 out of the 7 measured failed to meet the integrated field flatness spec. The data had only been taken Tuesday morning and it was not yet clear why there was a problem. Kevin suggested a geometry effect related to the coil packs and perhaps swapping coils might help. Dave said that the coils must be installed in particular ways to meet mechanical tolerances around the magnets. Bob asked about shims to fix the problem. Dave said that without remeasuring every article, shims might introduce field errors of another kind and we wouldn't know.

  The other question was do we need the entire 9 cm aperture? And Dave said the aperture was chosen as a 6 sigma plus 2 cm aperture and is consistent with the quads, so stopping down the aperture to meet the field integral spec would also cut the acceptance. Dave's plan is to allow Jeff Karn to re-examine the data and then check the end fields. The measurements will take about 1/2 day after Jeff and Dave decide what to do.

  The other question is that as a statistical group, the DWs probably meet spec and could be installed. The one problem is that without knowing what type of error the data indicates, we cannot model it and we could install a set of magnets which would lead to a long term commitment to setup by "tweaking".

  For the time being Jeff will re-examine the data for the source of the flaw.

• Bob said that the commissioning schedule was going to be changed to adopt Kevin's suggestion that we go as far in the machine as possible before Christmas and work the problems during the January down.

• Geoff wrote a memo concerning the commissioning schedule which pointed out that the schedule did not allow time to characterize the accelerator. the schedule only allowed time to press-on to program milestones. Bob agreed with that and explained that with the present funding limits, a demonstration that the accelerator CAN work was important. Fred said that the schedule shouldn't be obsessed with demonstrations to secure funding and that finding funding was his job.

Action Items

• High level apps for diagnostics meeting first week in Sept. (LEGG)

A-15   1  Commissioning Procedure                  Legg, Krafft    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        Krafft/Kehne
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 agenda/corrections to minutes            Legg             5 min.
*  Rf integration update                           Merminga        15 min
*  Discussion                                      ALL             20 min
*  New issues                                      All             10 min
*  Agenda for next meeting                         All              5 min.