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Homestake Meeting, 08/21/2014

Attending: Riccardo, Gwynne, Tanner, Vuk, Noah, Eric, Nelson

Homestake wiki: https://zzz.physics.umn.edu/groups/homestake/home

Our agenda:

1) Homestake update

1. planning next visit: Sep 21-27
2. status of various orders:
   1. GPS units: ordered 25 transceivers and 10 splitters. Expect 6 week delivery, hoping to get a few units earlier than that, for tests during the next visit to Homestake
   2. fiber: ordered 13000', should be delivered within 1 week
   3. network components: ordered network switches, media converters, boxes to house equipment etc, expect delivery within 1 week
   4. poly panels: ordered ~50 panels, should already be delivered at Homestake
   5. granite tiles: still have not heard back from Homestake, will probably purchase several at MSP
   6. anything for surface stations?
3. status of various documents (MOU, Exp. Planning Statement, Insurance certificates)

2) UMN test setup (Tanner): setting up the equipment in the new lab, and writing down a procedure to streamline it for Homestake. Then will focus on streaming the data.

3) Analysis of existing data

1. Estimation algorithms (Shivaraj, Eric, Noah):
   1. Noah's S-wave study: corrected the error (different velocity used in injection and recovery), and reproduced different tests discussed at the last meeting. Correctly recover injection position, shows strong dependence on scale of the array (or equivalently on the frequency of the wave), as well as on the array configuration. Changing polarization can change the shape of the recovered blob, but the blob is typically well centered.
   2. Noah's P-wave study: found that averaging over recoveries at different frequencies improves the recovered position (have to check if this is dominated by the lowest frequencies), while averaging over longer periods of time yields the same checker board patterns.
2. Analysis of Sweetwater Array data: Michael's pdf