1. ISIS OPTIMVS NEVTRONVM SPALLATIONENSIVM FONS MVNDI
ISIS Developments
David Findlay
Accelerator Division
ISIS Department
Rutherford Appleton Laboratory
ISIS OPTIMVS NEVTRONVM SPALLATIONENSIVM FONS MVNDI

2. ISIS — world’s leading spallation neutron source
But ISIS accelerators primarily a neutron factory
~800 experiments/year
~1600 visitors/year
Output and reliability are key quantities

4. ISIS from air

5. ISIS outline
17 kV H– ion source
35 kV DC gap
665 keV RFQ — new
70 MeV drift tube linac
800 MeV proton synchrotron — new 2RF
Target station 1 — 50 pps at present pps when TS-2 running
Target station 2 — 10 pps — new
Obsolescence mitigation — on-going

6. 10 amp-hours delivered on 12 December 2005
2.25E+23 protons
4.4E+24 neutrons
7.5 g neutrons
~£30M/g

7. 202½ MHz 4-rod RFQ LEBT Ion source

8. RFQ rods + stems assembly

9. Old Cockcroft-Walton

10. 2RF: High power driver Cavity

11. Four 2RF cavities in Straights 4, 5, 6 & 8

12. 4 × 200–2000 A cavity bias regulators

13. 4 × 20 kV, 10 A anode power supplies

14. Obsolescence mitigation
Replacing ageing equipment
E.g. the NINA big choke
linac RF systems
extraction fast kickers
...

15. Old and new chokes for synchrotron main magnet power supply

16. Extraction kickers: 5000 A, 100 ns rise time

17. Tantalum wire shock tests for neutrino factory target

18. Tantalum wire during and after pulsing

19. Aim of RFQ + 2RF: 200 µA → 300 µA
New beam dynamics régime in synchrotron
Commission 2RF with beam — Andy Seville
Beam losses — Steve Payne
Diagnostics — Ben Pine