Shenguang-IV Laser ICF Facility

Shenguang-IV (Chinese: 神光-IV, meaning 'Divine Light IV') is China's next-generation laser inertial confinement fusion (ICF) facility under construction at the China Academy of Engineering Physics (CAEP) in Mianyang. Shenguang-IV represents China's commitment to advancing laser-driven ICF for both weapons physics simulation and fusion energy research.

Key aspects of Shenguang-IV:

1. ICF for weapons simulation: The primary dual-use application of Shenguang-IV is nuclear weapons physics simulation. Under the Comprehensive Test Ban Treaty (CTBT), nuclear weapons states use ICF facilities to simulate nuclear weapon physics without underground testing. China's secret underground nuclear test (June 2020, per DiNanno) highlights the weapons simulation context.

2. Construction timeline: Construction began in 2017. The facility represents a significant investment in Chinese laser ICF capability, bringing China closer to US National Ignition Facility (NIF) and French Laser Mégajoule (LMJ) capabilities.

3. Predecessor — Shenguang-III: Shenguang-III is the operational predecessor, an earlier-generation laser ICF facility at CAEP Mianyang. Shenguang-III has been used for ICF experiments and weapons physics research. Shenguang-IV represents a significant upgrade in laser energy and capability.

4. CAEP Mianyang: The facility is located at CAEP Mianyang, China's equivalent to the US NNSA. CAEP is responsible for Chinese nuclear weapons development, testing, and stewardship. The co-location of Shenguang-III, Shenguang-IV, Julong-2, Qiangguang-1, and PTS at CAEP Mianyang creates one of the world's most concentrated pulsed power and ICF research campuses.

5. Dual-use and Military-Civil Fusion: Under China's Military-Civil Fusion (MCF) policy, technology from Shenguang-IV can flow to both military and civilian applications. The laser technology, diagnostics, and target fabrication have both weapons and energy applications. This is a textbook example of China's dual-use technology strategy.

6. Comparison to US NIF: The US National Ignition Facility (NIF) at Lawrence Livermore National Laboratory achieved ignition in December 2022. Shenguang-IV represents China's effort to close the gap with US ICF capability. While NIF is primarily a weapons stewardship facility, Shenguang-IV has both weapons and energy missions.

7. Connection to Chinese ICF ecosystem:

• CAEP Mianyang — operator
• Julong-2 (50 MA pulsed power) — complementary pulsed power ICF
• Z-FFR — fusion-fission hybrid using Z-pinch driver
• Qiangguang-1 and PTS — supporting pulsed power facilities
• The Chinese ICF ecosystem is one of the world's most comprehensive

Shenguang-IV represents China's most advanced laser ICF capability and a direct challenge to US ICF leadership. The dual-use nature of the facility, combined with China's Military-Civil Fusion policy, means that advances in ICF technology can flow to both weapons stewardship and energy production applications.