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We report spectroscopic confirmations of 15 Lyman-alpha galaxies at $z\sim7$,implying a spectroscopic confirmation rate of $\sim$80% on candidates selectedfrom LAGER (Lyman-Alpha Galaxies in the Epoch of Reionization), which is thelargest (24 deg$^2$) survey aimed at finding Lyman-alpha emitters (LAEs) at$z\sim7$ using deep narrow-band imaging from DECam at CTIO. LAEs athigh-redshifts are sensitive probes of cosmic reionization and narrow-bandimaging is a robust and effective method for selecting a large number of LAEs.In this work, we present results from the spectroscopic follow-up of LAEcandidates in two LAGER fields, COSMOS and WIDE-12, using observations fromKeck/LRIS. We report the successful detection of Ly$\alpha$ emission in 15candidates (11 in COSMOS and 4 in WIDE-12 fields). Three of these in COSMOShave matching confirmations from a previous LAGER spectroscopic follow-up andare part of the overdense region, LAGER-$z7$OD1. Additionally, two candidatesthat were not detected in the LRIS observations have prior spectroscopicconfirmations from Magellan. Including these, we obtain a spectroscopicconfirmation success rate of $\sim$$80$% for LAGER LAE candidates. Apart fromLy$\alpha$, we do not detect any other UV nebular lines in our LRIS spectra;however, we estimate a 2$\sigma$ upper limit for the ratio of NV/Ly$\alpha$,$f_{NV}/f_{Ly\alpha} \lesssim 0.27$, which implies that ionizing emission fromthese sources is mostly dominated by star formation. Including confirmationsfrom this work, a total of 33 LAE sources from LAGER are now spectroscopicallyconfirmed. LAGER has more than doubled the sample of spectroscopicallyconfirmed LAE sources at $z\sim7$.

New spectroscopic confirmations of Lyman-$\alpha$ emitters at z $\sim$ 7 from the LAGER survey