high energy
(8) Linac Coherent Light Source II high energy upgrade (A) Definitions In this paragraph: (i) High energy The term “high energy”, with respect to an x-ray, means a photon with an energy in the 5 to 13 kiloelectron volt range. (ii) High repetition rate The term “high repetition rate” means the delivery of x-ray pulses up to 1,000,000 pulses per second. (iii) Ultra-short pulse The term “ultra-short pulse”, with respect to an x-ray, means that the x-ray has bursts capable of durations of less than 100 femtoseconds. (B) Upgrade The Secretary shall— (i) provide for the upgrade to the Linac Coherent Light Source II facility described in the publication approved by the Basic Energy Sciences Advisory Committee on June 9, 2016 , entitled “Report on Facility Upgrades”, including the development of experimental capabilities for high energy x-rays to reveal fundamental scientific discoveries; and (ii) ensure such upgrade enables the production and use of high energy, ultra-short pulse x-rays delivered at a high repetition rate. (C) Start of operations The Secretary shall, subject to the availability of appropriations, ensure that the start of full operations of the upgrade under this paragraph occurs before December 31, 2026 . (D) Funding Out of funds authorized to be appropriated under subsection (j), there are authorized to be appropriated to the Secretary to carry out the upgrade under this paragraph— (i) $100,000,000 for fiscal year 2023; (ii) $130,000,000 for fiscal year 2024; (iii) $135,000,000 for fiscal year 2025; and (iv) $99,343,000 for fiscal year 2026.