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The High-Altitude Water Cherenkov (HAWC) Observatory is used for detectingTeV gamma rays. HAWC is operating at 4,100 meters above level sea on the slopeof the Sierra Negra Volcano in the State of Puebla, Mexico, and consists of anarray of 300 water Cherenkov detectors (WCDs) covering an area of 22,000 $m^2$.Each WCD is equipped with four photomultiplier tubes (PMTs) to detect Cherenkovemission in the water from secondary particles of extensive air-shower (EAS)that are produced in the interactions of primary particles (gamma rays orcharged cosmic rays) in the atmosphere. HAWC is able to reconstruct the EAS inthe 0.5 to 100 TeV energy range. In order to improve the core determination forevents with high energy ($>10$ TeV) when the events arrive outside of the HAWCarray, the Outrigger upgrade project is adding 350 small WCDs around the mainarray. These outrigger tanks each have one PMT in a 1.5 meter diametercylindrical polyethylene tank, covering a total area four times larger thanthat of the HAWC array. In this work we present leak light testing to identifythe stability of the detector and an analysis of deposited charges tounderstand the detector performance.

Stability and behavior of the outer array of small water Cherenkov detectors, outriggers, in the HAWC observatory