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 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

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

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

Rutherford Appleton Laboratory, looking north ISISDiamond

Rutherford Appleton Laboratory, looking north-east ISIS

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

Inside Tank 4

Tanks 2 and 3 — built in 1954

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

1RF cavity 9

2RF cavity 6

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

Overall target system schematic — 2 Target in operational position Target withdrawn into remote handling cell

Target, reflectors and moderator assembly

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

Target, reflectors and moderator assembly — 2

Solid methane moderators — containing aluminium foam for heat conduction

Target services trolley — 1

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 ISIS70 MeV H – linac0.2 MW MeV H + synchrotron J-PARC180 MeV H – linac0.2 MW GeV + 50 GeV synchrotrons LANSCE800 MeV H + /H – linac0.8 MW + accumulator ring PSI590 MeV cyclotron1.2 MW + 72 MeV injector cyclotron SNS1 GeV H – linac0.6 MW 2 + 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

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

47