SPEAR3 HLS Sensors from ID6 to ID4

To detect a tilt of the insertion device (ID) 6, one sensors has been placed on each end of the support structure along the beam, see Figure below. To look at the floor movement along the path of beam line 6 an HLS sensor has been installed close to the mirror. Further down the ring one HLS sensors has been installed on both sides of ID 4 on the floor. All the sensors are connected to each other to detect relative floor movements.

The presented data are filtered to eliminate noise caused by bumps on the pipes or the HLS sensors themselves. The filter applied eliminates data if they change more than 5 µm in 2 sec.

The data presented here are filtered mean values for 15 min periods.

The movements at the sensor position seem to be correlated with precipitation, the data shown here are extracted from www.wunderground.com.

Filtered data with a sampling rate of 2 seconds.

The pitch is calculated as (HLS4-HLS5)/2.45 m.

The data presented here are filtered mean values for 15 min periods.

Filtered data with a sampling rate of 2 seconds.

The pitch is calculated as (HLS1-HLS2)/2.08 m.

The data presented here are filtered mean values for 15 min periods.

Filtered data with a sampling rate of 2 seconds.

Water level: 6187 µm

Temperature at