OSEM Preliminary Design Review
12th July 2005
Interface Control Document (ICD):
Suspension, UK Scope (SUS/UK) –
Suspension, US Scope (SUS/US)
E050160-01 (draft2)
Document Highlights
S. Aston / D. Hoyland
LIGO-G050xxx-00-K
OSEM Preliminary Design Review
12th July 2005
OSEM Local Coordinate System
» x & y axes on the plane of the coil former front face
» (Sensing) z-axis, is axial through the centre of coil former cylinder
– Origin at the centre of the front face of coil former
z
see section 1.1.1.1, figure 3
OSEM Mass Properties
» Mass given is that measured for the actual prototype OSEM device
– Need to specify a target OSEM mass, (any requirement on upper
limit?)
» Centre of Mass figures taken from Solidworks model (using
available z-axis OSEM adjustment)
z
LIGO-G050xxx-00-K
see section 1.1.1.1.1
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OSEM Preliminary Design Review
12th July 2005
OSEM Envelope
» ‘Slimmed Down’ version of OSEM clamp
– Now uses the same (external) dimensions as the Hybrid OSEM clamp
z
see section 1.1.1.1.2, figure 4
OSEM Adjustment (to summarize)
» x-y axes have ± 0.3 mm (via oversized tapped mounting holes)
» (Sensing) z-axis, has ± 5.6 mm (via OSEM adjustment assembly)
– Need to specify a target OSEM mass, (any requirement on upper
limit?)
» Centre of Mass figures taken from model (using OSEM adjustment
z
LIGO-G050xxx-00-K
see section 1.1.1.1.1
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OSEM Preliminary Design Review
12th July 2005
OSEM Flag Dimensions
» Length driven by sensor and actuator separation
– For reference T050111-00-K - OSEM Preliminary Design Document
» Dimensions for prototype design are as follows:– ∅ 3 mm cylindrical flag, extended section ≈ 30 mm
» Coil Former Key Dimensions
– Coil former (minimum) ID of flag port = 4.78 mm
– (Coil former (maximum) ID of magnet port = 12.7 mm)
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OSEM Preliminary Design Review
12th July 2005
Power Interface
» Local Regulation on low rails and TBC high voltage rails (pending
further investigation,
» Voltages at the Subrack input specified ±1V
Cabling – Rack to satellite box and satellite box to vac
» Should now be compatible and consistent with vac cables for
LASTI
Input/ Output Ranges
» Common understanding: 0V/10V to 10V/0V = +/-10V = 20V pk-pk
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OSEM Preliminary Design Review
12th July 2005
Cable Driving
»
Assuming 100pF/m core to core and core to ground for testing
Noise
» Sensor 8uV/rtHz at 10Hz?
» Actuator (not penultimate) 100pA/rtHz with input noise 1uV/rtHz
» Actuator (penultimate) 30pA/rtHz with input noise 1uV/rtHz
Coil Drive Output Impedance
» Non penultimate – 100R
» Penultimate – 1KR
Power Dissipation
» Convection Cooling
LIGO-G050xxx-00-K
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