ISIS operational update David Findlay Accelerator Division ISIS Department Rutherford Appleton Laboratory / STFC DL-RAL Joint Accelerator Workshop, RAL 20–21 January 2009

ISIS Second Target Station now operational

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

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

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

First beam — 340 V double pulse into 25 ohms 1 hour 17 minutes to get beam from synchrotron to TS-2 First neutrons

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

Guinness Book of Records — can no longer show this photo

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

Rutherford Appleton Laboratory, looking north ISIS Diamond Rutherford Appleton Laboratory, looking north

Rutherford Appleton Laboratory, looking north-east ISIS Rutherford Appleton Laboratory, looking north-east

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

ISIS from air

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

Inside Tank 1 15

Inside Tank 4 16

Tanks 2 and 3 — built in 1954 17

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

1RF cavity 9 19

2RF cavity 6 20

MICE pion beam line in synchrotron room

ISIS TS-1 experimental hall

ISIS TS-2 experimental hall

Proton beam line EPB2 to TS-2 — 1

Proton beam line EPB2 to TS-2 — 2

Proton beam line EPB2 to TS-2 — 3

Overall target system schematic — 1

Target in operational position Target withdrawn into remote handling cell Overall target system schematic — 2

Target, reflectors and moderator assembly

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

Target, reflectors and moderator assembly — 2

Solid methane moderators — containing aluminium foam for heat conduction

Target services trolley — 1

Target services trolley — 2

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

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.

J-PARC

LANSCE

PSI — Villigen, Switzerland

PSI cyclotron PSI target station

SNS — Oak Ridge

2/3 power law

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