WP6: Mechanical Studies LCFI collaboration meeting 19/9/2006 Erik Johnson CCLRC Rutherford Appleton Laboratory.

WP6: Mechanical Studies

LCFI collaboration meeting 19/9/2006Erik Johnson

CCLRC Rutherford Appleton Laboratory

Erik Johnson, RAL LCFI Collaboration meeting 19/9/2006

Recent Activities at RAL

• In the Lab– Measurement of ladders with the upgraded

LASS– Acquainting myself with the Cooling test rig

• In the Office– Silicon Stress studies simulation– Ladder construction concept

Erik Johnson, RAL LCFI Collaboration meeting 19/9/2006

Ladder Measurement

• Had two ladders already constructed– RVC-1, carbon foam core sandwiched by thin

silicon (damaged in construction)– SiC-1, Silicon carbide substrate with silicon

“floating above it” attached by adhesive pillars– Both cycled in temperature, from room

temperature down to approx. -50 degrees C

• Upgraded Lass working well– No longer seeing ripples generated by the

measurement system

Erik Johnson, RAL LCFI Collaboration meeting 19/9/2006

Erik Johnson, RAL LCFI Collaboration meeting 19/9/2006

Erik Johnson, RAL LCFI Collaboration meeting 19/9/2006

Results

Erik Johnson, RAL LCFI Collaboration meeting 19/9/2006

Erik Johnson, RAL LCFI Collaboration meeting 19/9/2006

Silicon stress studies

• Current work to date has not come up with a reasonable reason for the magnitude and direction of curl– Assumes an homogenous layers of material deposited on the

silicon• In reality the material deposited is in strips

• Simulation of this is required and may give us the

explanation we need

Erik Johnson, RAL LCFI Collaboration meeting 19/9/2006

Construction concept

• Started a plan for building a RVC ladder– Made a cartoon

strip for the construction process

• Naturally lead to a concept for the end of a ladder

Erik Johnson, RAL LCFI Collaboration meeting 19/9/2006

Other ongoing work

• Plans for other testing of ladders– Hydrothermal aging, radiation damage etc

• Informal discussions with Lola Composites about alternative uses of carbon fibre structures, eg carbon fibre barrels

Erik Johnson, RAL LCFI Collaboration meeting 19/9/2006

Work in Oxford

Erik Johnson, RAL LCFI Collaboration meeting 19/9/2006

Work in Oxford