Re-surveying the LBA

As part of the summer maintenance, we surveyed the LBA heights. One of the concerns was that the freeze/thaw cycle in the soil and gravel that supports the LBA would cause subsidence or a minor 'palsen' effect which in turn would distort the array field.

To carry out this test, we used a laser level and investigated the relative heights of the different aerials. This task was carried out by some of our summer workers.

Conducting the LBA survey with the laser level is in the foreground. (Photo: D. McKay-Bukowski)