Accelerator and Target news

Higher beam currents at ISIS

Sustained beam currents of 230 µA have been produced during ISIS run cycles, meaning that ISIS can deliver the same number of protons to TS-1 whilst also supplying TS-2. The secret is reducing beam loss in the synchrotron.


The performance of the ISIS accelerators is limited by the amount of beam that is lost during the acceleration cycle. Simulation studies (top) can be compared with measured (bottom) beam loss in the synchrotron to better understand the causes of beam loss.
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The ISIS dual harmonic system - which consists of four new accelerating cavaties inserted into the accelerator - enables beam intensity to be increased by reducing proton beam loss. The figure shows beam loss with and without the dual harmonic system in operation.
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dual harmonic

A dual harmonic accelerating cavity in the ISIS synchrotron.
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beamline choppers

The three beamline choppers for Wish ready for installation, with team Mike Brind, Paul Chorley, Erik Johnson, Peter Galsworthy and Adam Davis (ISIS).
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radiation monitors

Robin Burridge (ISIS) inspecting a newly-installed cabinet of radiation monitors for TS-1's services area. The monitor heads are positioned around the services trolley to detect any changes in background levels and to highlight any fluctuations within the D2O water cooling circuits during operation.
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reflector and moderator

The second target station, reflector and monitor assembly being prepared.
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Steve West (ISIS) inspecting the new synchrotron main magnet power supply chokes during installation in May.
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tungsten target

Final preparations being made on the new tungsten neutron target and reflector assembly prior to its first operational run in May. This work was undertaken within the remote handling cell via two pairs of master/slave manipulator arms positioned either side of the target and moderator assembly.
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buffer tanks

Mike Ruddle (ISIS) in front of new buffer tanks for the first target station cryogenic moderators. Each has a capacity of 2000 l. Five are used to hold methane following the daily transfer, with the sixt for any gas vented from the hydrogen system.
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dan faircloth

Dan Faircloth (ISIS) inspects ISIS ion sources. An ion source typically 20 to 30 days before needing to be replaced, and a collection of ten sources, which are made at ISIS, is kept ready to be used.
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tom noone

ISIS Duty Officer Tom Noone keeping a watchful eye on accelerator parameters.
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