SCX User Meeting 2017:Report from OCL

Copenhagen, 20/06/16 OCL Report by J.C. Müller 2

OCL - Topics

● Beam Time– 2016

– 2017

● Troubles & Projects– Ion Source

– Beam Diagnostics

– Radio Frequency System

Copenhagen, 20/06/16 OCL Report by J.C. Müller 3

Beam Time at Ocl 2016

● 18 Experiments / Runs

– 9x Nuclear and Energy Physics group (~912 hrs)

– 4x Biophysics Group (~72hrs)

– 3x ESS (~40hrs)

– 2x PET (~2hrs)

● Overall Beam Time was ~1026hrs

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Beam Time at Ocl 2017

● 8 Experiments / Runs

– 1x Nuclear and Energy Physics group (~48 hrs)

– 2x Biophysics Group (~48hrs)

– 5x ESS (~48hrs)

● Overall Beam Time so far was ~144hrs

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Ion Source Trouble - Indicators

● Difficulties accelerating certain particles

● Low yield, only hundreds nA instead of several µA

● Strange magnet settings for Circular Correction Coil 1

● Very high Voltage on the Arc Power Supply, > 1kV instead of 500kV - 900kV

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Ion Source Trouble - Measures taken so far

● Screws replaced with new Titanium screws

● The Tubes and Swagelok connections between Chimney Selector Valves and the Anode Plug were replaced

● The Anode was cleaned and later replaced, the port covers replaced and aligned

● A water leak in the upper Anode Plug was fixed

● The Center Regions alignment was checked, the Dee Tips were sandblasted for cleaning

● The piping between the Mass Flow Controller and the Chimney Selector Valve (N=1 & N=2) were replaced, as were the valves

● Different Ion Source Angles were tested, best yield for 4He at 3°

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Ion Source Trouble - Measures to be taken

● The lower Anode Plug will be serviced due to a suspected vacuum leak between the Anode Plug and the Cathode Holder

● Overall regular / annual service of the Ion Source and Center Region

● Replacing the Dee Tips

● Suggestions?

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Ion Source Trouble - Anode

● Old Anode– Cracked port covers

– Clogged Gas Channels

– Cavitys in the Gas Channels

– Overall badly burned

● New Anode– Reworked 2 times due to

water leaks

– Finally installed mid-September

– All types of particles were succesfully accelerated

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Ion Source Trouble – Upper Anode Plug

● Water Leak– A Swagelok connection was

worn out

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Beam Diagnostics

● Deflector Exit Sonde– The sondes housing has

serverely been burned, the sondes probe heads have been shortened to ground and therefore no readout

– The Beam Current Amplifiers work, but on two out of four channles IBA has installed a moving mean value on the PLC which causes huge delays

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Radio Frequency System

● ENI RF driver amplifier10Ω Resistors were burned and replaced.

● FlapA fixation pin on one of the gears had sheared off causing the RF to crash.A supporting PVC cylinder was mounted to avoid veering of the drive shaft.

● ResonanceAir hose had burned through on the slider.

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Thank you for your attention!

Any Questions?