ECR: Replacement of the coil-series resistors in the HAM-A coil drivers

Document #:

LIGO-E1201027-v1

Document type:

E - Engineering documents

Abstract:

The dynamic range requirement for the aLIGO HAM-A coil driver is 35 mA p-p for frequencies 1 kHz. However, under the current design they are generating a maximum of 201 mA, which has potential for introducing unwanted actuation noise, as well as some potential for damage. An increase in the coil-series resistance by a factor of 10 will correct this problem.

Files in Document:

• E1201027-v1 ECR- HAM-Aux and Tip-Tilt replace resistor.pdf (22.1 kB)

Other Files:

• HAM-A replace resistor ECR Form-1.docx (23.3 kB)

Topics:

• Upgrades
• Requirements
• Final Design
• Sensing and Control
• Commissioning
• Suspensions
• Input Optics

Authors:

• David Feldbaum

Keywords:

coil driver ham-a haux htts hamaux tip-tilt electronics

Notes and Changes:

11/16/2012: Approved by Dennis Coyne & Peter Fritschel

Referenced by:

• LIGO-E1201036: DCN for schematic changes to aLIGO HAM Auxilary and Tip/Tilt SUS Coil Driver
• LIGO-E1400300: Changes Resulting from Input Mode Cleaner Testing