Abstract
We present an overview of the performance of the Neutralized Drift Compression Experiment-II (NDCX-II) accelerator at Berkeley Lab, and report on recent target experiments on beam-driven melting and transmission ion energy loss measurements with nanosecond and millimeter-scale ion beam pulses and thin tin foils. Bunches with around 1011 ions, 1 mm radius, and 2-30 ns full width at half maximum duration have been created with corresponding fluences in the range of 0.1-0.7 J/cm2. To achieve these short pulse durations and mm-scale focal spot radii, the 1.1 MeV [megaelectronvolt (106 eV)] He+ ion beam is neutralized in a drift compression section, which removes the space charge defocusing effect during final compression and focusing. The beam space charge and drift compression techniques resemble necessary beam conditions and manipulations in heavy ion inertial fusion accelerators. Quantitative comparison of detailed particle-in-cell simulations with the experiment plays an important role in optimizing accelerator performance.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 373-378 |
| Number of pages | 6 |
| Journal | Laser and Particle Beams |
| Volume | 35 |
| Issue number | 2 |
| DOIs | |
| State | Published - Jun 1 2017 |
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Electrical and Electronic Engineering
Keywords
- Fusion energy
- Induction accelerator
- Materials
- Radiation damage
- Space charge