1. ISIS operational update
David Findlay
Accelerator Division
ISIS Department
Rutherford Appleton Laboratory / STFC
DL-RAL Joint Accelerator Workshop, RAL 20–21 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 ohms 1 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. Rutherford Appleton Laboratory, looking north
ISIS
Diamond
Rutherford Appleton Laboratory, looking north

11. Rutherford Appleton Laboratory, looking north-east
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 15

16. Inside Tank 4 16

17. Tanks 2 and 3 — built in 1954 17

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

19. 1RF cavity 9 19

20. 2RF cavity 6 20

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Target withdrawn into remote handling cell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. TS-2 tungsten target, tantalum coated, heavy water cooling
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 MW GeV + 50 GeV synchrotrons
LANSCE 800 MeV H+ /H– linac 0.8 MW accumulator ring
PSI 590 MeV cyclotron MW MeV injector cyclotron
SNS 1 GeV H– linac MW 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