Reports until 00:05, Wednesday 05 March 2014
H1 ISC
daniel.sigg@LIGO.ORG - posted 00:05, Wednesday 05 March 2014 (10512)
LSC front-end model changes for adding the REFL DC BIAS path

We completed the changes in the lsc model to include the ALS-C_REFL_DC_BIAS path. It is split off the input matrix and now has power normalization, an extra LSC filter module (LSC-REFL_BIAS), and triggers. It bypasses the output matrix and directly links to the ALS filter module which is outputed to the DAC. The DAC channel is available at the DB9 breakout panel at the ISC-R4 rack. It is intended to be wired into the CM summing node. Currently, it is wired to the second input of the common mode board. Medm screens have been updated to add the extra matrix row where needed. The new filter modules are only available from the ALS_CORNER overview screen. Model and medm screens have been submitted to svn.