ISIS operational update

David FindlayAccelerator DivisionISIS DepartmentRutherford Appleton Laboratory / STFC

DL-RAL Joint Accelerator Workshop, RAL20–21 January 2009

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ISIS Second Target Station now operational

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ISIS Second Target Station now operational

70 MeV H– linac

800 MeV proton synchrotronTS-1

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ISIS Second Target Station now operational

70 MeV H– linac

800 MeV proton synchrotronTS-1

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Dec. 2007: first protons to TS-2

Aug. 2008: first neutrons from TS-2

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

First neutrons

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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

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ISIS — world’s most productive spallation neutron facility

ISISJ-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-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Target withdrawn into remote handling cell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

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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

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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

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Trip rates / High power proton accelerators

0.01

0.1

1

10

100

1000

0.1 1 10 100 1000 10000 100000 1000000

Trip length (seconds)

Tri

ps

pe

r d

ay

lo

ng

er

tha

n t

rip

le

ng

th

ISIS

LANSCE

PSI

SNS

2/3 power law

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Other accelerator work

H– ion sources

Front ends

DHRF, ring R&D

ISIS upgrades

Electrical engineering

Letchford

Thomason

Glover

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