wp6: mechanical studies lcfi collaboration meeting 19/9/2006 erik johnson cclrc rutherford appleton...
TRANSCRIPT
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