ISIS operational update David Findlay Accelerator Division ISIS Department

1. ISIS operational update David Findlay Accelerator Division ISIS Department Rutherford Appleton Laboratory / STFC DL-RAL Joint Accelerator Workshop, RAL20–21 January 2009

2. ISIS Second Target Station now operational

3. ISIS Second Target Station now operational 70 MeV H– linac 800 MeV proton synchrotron TS-1

4. ISIS Second Target Station now operational 70 MeV H– linac 800 MeV proton synchrotron TS-1

5. Dec. 2007: first protons to TS-2 Aug. 2008: first neutrons from TS-2

6. First beam — 340 V double pulse into 25 ohms1 hour 17 minutes to get beam from synchrotron to TS-2 First neutrons

7. Spallation neutron sources: • for investigating structure and dynamics of molecular matter • Currently operating spallation neutron sources: • PSI (Villigen, Switzerland) • SNS (Oak Ridge) • ISIS (RAL, Oxon.) • LANSCE (Los Alamos) • J-PARC (Tokai-mura) Decreasing power

8. Guinness Book of Records — can no longer show this photo

9. ISIS — world’s most productive spallation neutron facility • ISIS • J-PARC, LANSCE, PSI, SNS • ISIS: 800 MeV protons on to tungsten targets, 0.2 MW • TS-1, 0.16 MW, 40 pps; TS-2, 0.04 MW, 10 pps • ~800 neutron experiments per year • ~1600 visitors/year (~5000 visits) • ISIS accelerators wholly for neutron factories • Also muon factory Decreasing number of target stations

10. ISIS Diamond Rutherford Appleton Laboratory, looking north

11. ISIS Rutherford Appleton Laboratory, looking north-east

12. 70 MeV H– linac 800 MeV proton synchrotron TS-1

13. ISIS from air

14. View down north side of ISIS 70 MeV H– MeV linac

15. Inside Tank 1

16. Inside Tank 4

17. Tanks 2 and 3 — built in 1954

18. Superperiods 9, 0 and 1 of the ISIS 800 MeV synchrotron

19. 1RF cavity 9

20. 2RF cavity 6

21. MICE pion beam line in synchrotron room

22. ISIS TS-1 experimental hall

23. ISIS TS-2 experimental hall

24. Proton beam line EPB2 to TS-2 — 1

25. Proton beam line EPB2 to TS-2 — 2

26. Proton beam line EPB2 to TS-2 — 3

27. Overall target system schematic — 1

28. Target in operational position Target withdrawn into remote handling cell Overall target system schematic — 2

29. Target, reflectors and moderator assembly

30. Moderators Solid tungsten cylinder, tantalum coated, surface cooled, 68 mm dia., 307 mm long — exploded view Reflector TS-2 tungsten target, tantalum coated, heavy water cooling

31. Target, reflectors and moderator assembly — 2

32. Solid methane moderators — containing aluminium foam for heat conduction

33. Target services trolley — 1

34. Target services trolley — 2

35. TS-2 optimised for cold neutrons • Long wavelengths, big molecules • TS-2 runs at 10 pps — 100 ms between pulses • 10 pps stolen from 50 pps from synchrotron • Only 40 pps left for TS-1 • Beam current × 50/40 • Dual harmonic RF — JWGT later • Commissioning TS-2 • Difficult while running full programme to TS-1 • Also CDM restrictions

36. ISIS 70 MeV H– linac 0.2 MW + 800 MeV H+ synchrotron J-PARC 180 MeV H– linac 0.2 MW1 + 3 GeV + 50 GeV synchrotrons LANSCE 800 MeV H+ /H– linac 0.8 MW + accumulator ring PSI 590 MeV cyclotron 1.2 MW + 72 MeV injector cyclotron SNS 1 GeV H– linac 0.6 MW2 + accumulator ring 1: For limited time during commissioning; ultimate design 1 MW with 400 MeV linac. 2: Still commissioning; 1 MW design operation.

37. J-PARC

39. LANSCE

41. PSI — Villigen, Switzerland

42. PSI cyclotron PSI target station

43. SNS — Oak Ridge

45. 2/3 power law

46. Other accelerator work • H– ion sources • Front ends • DHRF, ring R&D • ISIS upgrades • Electrical engineering Letchford Thomason Glover