1. Target tests 1 st – 2 nd Nov. Chris Booth Sheffield 7 th December 2006

2. Chris BoothUniversity of Sheffield 2 MICE beam pipe installed in ISIS, pumped down Target drive on support frame connected above gate valve Cables & optical fibres laid between MICE hall & ISIS vault Control electronics installed in MICE hall Power electronics installed in ISIS vault Scintillators installed by wall of ISIS vault –10 m from target, at correct production angle Installation late October

3. Chris BoothUniversity of Sheffield 3 Beam pipe and target stand

4. Chris BoothUniversity of Sheffield 4 Target drive in place Photos courtesy of Chris Nelson & Paul Drumm!

5. Chris BoothUniversity of Sheffield 5 Target drive in place

6. Chris BoothUniversity of Sheffield 6 Shielded RAL scintillation counters

7. Chris BoothUniversity of Sheffield 7 MICE hall - data taking in progress!

8. Chris BoothUniversity of Sheffield 8 ISIS signals: –Machine Start (MS) synchronisation signals –Beam loss monitors Two RAL scintillators, in shielded box Two small Glasgow scintillators Target position readout All digitised on scopes and read out by PC. Instrumentation

9. Chris BoothUniversity of Sheffield 9 Several mono-mode fibres damaged during installation, 2 beyond use –No replacement in Europe! –Specialist company located to repair & reinstall 3-channel semiconductor laser stopped working –Revived 4 days later when rep. arrived with spare! –(but another channel later stopped for several hours) No motor drive for jacking mechanism –Required accesses to operate by hand, at start & end of shifts Problem with limit switches prevented gate-valve operation –Fixed during access Problems!!

10. Chris BoothUniversity of Sheffield 10 Target drive electronics only 10 A max. –Only capable of modest accelerations ISIS running at 50 Hz  64 –Pulse every 1.28 s Survey run on night of 1 st Nov. –No signals into DAQ(!!). (Phone calls to control room!) Full run on night of 2 nd Nov. Two target modes: –Held static at various depths (to find beam size at injection) –Maximum amplitude pulses, initially late then timing advanced to meet beam Tests

11. Chris BoothUniversity of Sheffield 11 Still very preliminary –Analysis of scintillator data continuing in Glasgow & RAL –Beam loss studies in Sheffield “On-line” conclusions: –Beam is much smaller at injection than expected! (Does not “nearly fill the pipe”) –It has a hard edge Present state of analysis – from beam loss (see plots) –Acceleration of target only just adequate to sample beam at extraction –Beam (halo) reaches maximum size ~2 ms after injection –With optimum timing, target just scraped the shrinking beam through the ISIS cycle –Beam shrinkage is ~16 mm Results

12. Chris BoothUniversity of Sheffield 12 Beam loss versus position Injection Extraction

13. Chris BoothUniversity of Sheffield 13 Beam loss versus position Losses after ~2 ms Losses at extraction

14. Chris BoothUniversity of Sheffield 14 Loss versus time and depth Edge of pipe Combined data – many run conditions

15. Chris BoothUniversity of Sheffield 15 Still very preliminary –Analysis of scintillator data continuing in Glasgow & RAL –Beam loss studies in Sheffield “On-line” conclusions: –Beam is much smaller at injection than expected! (Does not “nearly fill the pipe”) –It has a hard edge Present state of analysis (see plots) –Acceleration of target only just adequate to sample beam at extraction –Beam (halo) reaches maximum size ~2 ms after injection –With optimum timing, target just scraped the shrinking beam through the ISIS cycle –Beam shrinkage is ~16 mm Results

16. Chris BoothUniversity of Sheffield 16 Drive remains in ISIS (electronics back in Sheffield) Old target drive recommissioned (with new optical readout) in Sheffield New drive electronics from Daresbury last week –Some problems, to be sorted –Higher current, but significant voltage droop through the pulse Tuning of control electronics in progress –Higher accelerations seen –Some reliability problems (due to droop?) Possibility of further run at end of ISIS period (week before Christmas) With higher acceleration, hope to clip beam at extraction only Next steps

17. Chris BoothUniversity of Sheffield 17 Tests were difficult, but successful Major effort by Sheffield, RAL, Glasgow (Thanks to all involved!) Much analysis still to do We hope we can obtain even more information in 2 weeks Conclusions