Target workshop: 12Mar10, 11:00 -- Imperial

1. Summary of target operation to date:

See slides.
Points noted during discussion:
- Spread of BCD (full width) 0.6 mm which is acceptable in ISIS and similar to the spread of the T1
- Electrical noise in R78 larger than in ISIS. Believed to be due to pure ground, proximity of power-supply and control/daq rack, and routing of cables. Agreed to try and address the issue of noise at source before running the next iteration of the target in R78.

See slides.
Result of study was inconclusive. AA will extend the range of data considered and make a reasonable estimate of the temperature rise expected.
We should consider viewing the target through the quartz window with a 'pucka' video or still camera.

Inspection and analysis of T2 plans for build of T3, T4 ...: JT:
- See slides.
Is T2 acceptable in the machine? Discussion
- Consensus:
  - We believed that:
    - Performance of target (i.e. stability of BCD and acceleration) was sufficient for it to be acceptable to MICE for running in ISIS:
      - Full width of BCD (~0.6 mm) is less than spread of vertical position of ISIS beam during a run
      - Dust that enters vacuum vessel from wear of plastic bearings not significant to affect operation of ISIS
  - Therefore, T2r, has demonstrated target has demonstrated that the present design is satisfactory.
  - The various ideas for improvements:
    - Smooth second flat;
    - Burnished bearing surfaces to size before assembly;
    - Improvement of alignment of magnetic axis;
    - Consideration of improved bearing material;
    - Dust 'management' through installation of dust catcher;
    - and other measures
  - will be implemented to improve performance and to further mitigate the production of dust and the ingress of dust into the vacuum vessel.

Magnetic QA: GB
- Rig ready ... photo of rig: here
- Will install on DLS magnet rig next week assuming availability and support from Emily.

See slides.
Agreed:
- Raise issue of whether additional BPS signals/interlocks are required at Trgt mtg with ISIS.
- Consider adding a 'hooter' for target raising under interlock conditions.
- Add cover for cabinet in vac-rack area

We agreed:

JT's plan for target build includes an 'emergency action' line to provide a replacement should the target on ISIS fail We therefore agreed that we would take the attitude that 'if it works, dont fix it' and propose not to move the present target out of the machine in the Easter shutdown;
T3 would be available in May, according to JT's plan, so would be able to consider installation in June s/d. But would need to review closer to the date.
Controls/DAQ work would need to be completed before Christmas. Looks OK on present schedule. Agreed that PS would help with magnetic analsys once phase 1 controls u/g was done. Start on Phase 2 on 01May10 'come what may' to be sure to finish by Christmas.

Agreed: