Krishna

BRS-2, the ground-rotation sensor for installation at EndY, will be delivered by us on March 23rd. The installation and commissioning is expected to take ~2-3 weeks. The aim is to reduce the impact of wind on the ISI and consequently DARM. This post is to describe the components and the current plan.

Refer to T1500596 for the wiring diagram. Refer to the following SWG logs for more info on BRS-2: 11355, 11362. Here is a check-list of major components:

1. BRS-2 Instrument including the autocollimator, platform and foam box. Also includes the 30-meter optical fiber and light source. 

 2. An Ion pump and pump controller.

 3. The Satellite controller box is done (pic attached) - this is the same as in the diagram except for the AI filters and preamp which are not needed. There is no pressure gauge on the vacuum can, but there is a 2-3/4" CF port to which one can be added. The RTDs are included.

 4. The ISI interface chasis (not yet built). We will bring the EP4374 and EP4174 but we need help building the chasis. Specifically, the AI filter, the SE to Diff Amplifier, the Front Panel adapter board and associated wiring. 

 5. The Beckhoff computer and the C# and PLC code. The C# code reads the camera at 2 kHz and can send data out at ~200 Hz to the PLC, which is currently running at 250 Hz and writing out the following signals: Tilt, Drift and Ref signals and the Status bits.

 6. We will bring the Piezo stacks and Piezo amplifiers to measure the tilt-transfer function.

 7. Spare flexures, and additional hardware for the assembly process.