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We show the feasibility of generating X-ray pulses in the 4 to 8 keVfundamental photon energy range with 0.65 TW peak power, 15 fs pulse duration,$9\times10^{-5}$ bandwidth, using the LCLS-II copper linac and hard X-ray (HXR)undulator. Third harmonic pulses with 8-12 GW peak power and narrow bandwidthare also generated. High power and small bandwidth X-rays are obtained usingtwo electron bunches separated by about 1 ns, one to generate a high power seedsignal, the other to amplify it by tapering the magnetic field of the HXRundulator. The bunch delay is compensated by delaying the seed pulse with afour crystals monochromator. The high power seed leads to higher output powerand better spectral properties, with $>$94\% of the X-ray power being withinthe near transform limited bandwidth. We discuss some of the experiments madepossible by X-ray pulses with these characteristics, like single particleimaging and high field physics.

Very high brightness and power LCLS-II hard X-ray pulses