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Sensors & Instrumentation Live

NEC Birmingham(B40 1NT)

25/09/2019 - 26/09/2019

Sensors & Instrumentation Live will celebrate its 10 year anniversary in 2019 and the UK’s (more)

PPMA Show 2019

NEC, Birmingham(B40 1NT)

01/10/2019 - 03/10/2019

The UK’s largest ever event in the processing and packaging sector calendar. With over 350 exhibitors (more)

Advanced Engineering 2019

NEC, Birmingham(B40 1NT)

30/10/2019 - 31/10/2019

The UK's largest annual advanced manufacturing trade show, Advanced Engineering is your opportunity to (more)

Opening doors for neutrons

Opening doors for neutrons
ISIS located in Harwell, Oxfordshire is the world's most successful pulsed spallation neutron source. It is used by scientists to probe the microscopic structure and dynamics of matter by providing controlled beams of neutrons and muons. Within the facility Power Jacks screw jacks have been providing a reliable linear actuation mechanism for the target station that permits the neutrons to reach the experimental instruments.

High energy protons from the ISIS accelerator are sent to the target station where neutrons are generated by the 'spallation process' and their characteristics are modified to make them usable for the neutron scattering experiments. The neutrons are produced when a 160kW proton beam hits a metal target made from thick tungsten plates. The resulting neutrons are directed into beam channels that surround the target and are the neutrons' route to the scattering instruments.

In total there are 18 beam channels and each has a shutter mechanism, which is opened if neutrons are required by an experiment. The shutters are made from steel and and are required to actuate in a vertical plane on an individual basis. Providing the linear actuation on each shutter is a Power Jacks 300kN E-series metric machine screw jack driven by a 7.5kW geared motor. The screw jack has an inverted translating screw configuration with 500mm of stroke and 16mm lead driven by a 32:1 worm gear set.

The standard design was customised to meet the exact customer installation and operation requirements. The special features ranged from large components such as a special lead screw to nuclear grade grease for screw and gear set lubrication. The screw jack is connected to the geared motor via a pin type lubricant free flexible coupling. The combination of the screw jacks gear type, screw type, gear ratio, screw lead and the additional gear set in the geared motor mean that screw jack is self-locking to prevent the possibility of back-driving.
 

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