TARGET WORKSHOP – IMPERIAL COLLEGE LONDON

Friday 8 May 2009

The ISIS – MICE interface

Eddie McCarron

Contents1.Vessel mods.

2.TC performance.3.Wiring mods.4.Conclusion.

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Mods to MICE vessel M113 in synchrotron

The melting of the target tip endangered the observation window below the target. The window will be moved.A thermocouple will be added to a new VAT isolation valve so the target tip temperature can be monitored.

Thermocouple enters here

New ISIS pumpingport and valve.

Beam direction Moved observation windowLighting window

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Mirror

Light

Observation port

Hand operatedVAT valve

17 kg

7.5 kg

Vessel

All parts have been delivered except vessel. Vessel due 15 th May 2009.

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SECTION A-A

SECTION B-B

20 mm

Target radiates 2J or 120J

TC absorbs 2/20 Jor 120/20 J

TC temp rise 0.05Cor 0.2C

Assume Emissivity = 0.5All heat transfer is via radiation.

Radiation view factor of 1/20 assumesTarget comes to rest in position shown.If it sticks in down position the view factorwill be much less than 1/20.

*Ref CNB 27th September 2006

‘Normal’ energy absorbed is 2J per shot i.e.2W. Hence target steady tempis 360C.*‘Target stuck down’ energy absorbed is 120J. Temp rise per shot = 150C.*

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To reduce installation time and radiation dose the cable ID and plug need to be on the other side.

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Conclusion

1.The TC does not seem to have a very good response time during normal operation. More detailed calculationsneed to be done to check this. AA.

2.The vessel and valve assembly is heavy (25kg). EM to consider lifting device from triangular frame to assist.3.The vessel and valve being heavy may spoil the aluminium diamond vacuum seal. EM to test in R78.4.The thermal calculations are based on the old target shape with an area of ~770mm 2 . The new target shape needs

to be considered.

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