Transcript CCLRC Template

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
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ISIS Second Target Station now operational
70 MeV H– linac
TS-1
800 MeV
proton
synchrotron
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ISIS Second Target Station now operational
70 MeV H– linac
TS-1
800 MeV
proton
synchrotron
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Dec. 2007: first
protons to TS-2
Aug. 2008: first
neutrons from TS-2
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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
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Guinness Book of Records — can no longer show this photo
ISIS — world’s most productive spallation neutron facility
ISIS
Decreasing
number of
J-PARC, LANSCE, PSI, SNS
target stations
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
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ISIS
Diamond
Rutherford Appleton Laboratory, looking north
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
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
Target in operational
position
Target withdrawn into
remote handling cell
Overall target system schematic — 2
Target, reflectors and moderator assembly
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
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ISIS
70 MeV H– linac
+ 800 MeV H+ synchrotron
J-PARC
180 MeV H– linac
0.2 MW1
+ 3 GeV + 50 GeV synchrotrons
LANSCE
800 MeV H+ /H– linac
+ accumulator ring
0.8 MW
PSI
590 MeV cyclotron
+ 72 MeV injector cyclotron
1.2 MW
SNS
1 GeV H– linac
+ accumulator ring
0.6 MW2
0.2 MW
1: For limited time during commissioning; ultimate design 1 MW with 400 MeV linac.
2: Still commissioning; 1 MW design operation.
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J-PARC
LANSCE
PSI — Villigen, Switzerland
PSI cyclotron
PSI target station
SNS — Oak Ridge
Trip rates / High power proton accelerators
Trips per day longer than trip length
1000
ISIS
LANSCE
PSI
SNS
100
10
2/3 power law
1
0.1
0.01
0.1
1
10
100
1000
10000
100000
1000000
Trip length (seconds)
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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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