{"paper":{"title":"Soft X-ray harmonic comb from relativistic electron spikes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.optics"],"primary_cat":"physics.plasm-ph","authors_text":"A. Sagisaka, A. S. Pirozhkov, A. Ya. Faenov, B. Dromey, C. Brenner, D. Neely, D. R. Symes, E. N. Ragozin, H. Ahmed, H. Daido, H. Kiriyama, H. Kotaki, H. Okada, I. Daito, J. Green, J. K. Koga, K. Kawase, K. Kondo, K. Ogura, L. Chen, M. Borghesi, M. Coury, M. Kando, M. Mori, N. Nishimori, P. Foster, P. Gallegos, P. McKenna, P. Rajeev, S. V. Bulanov, T. A. Pikuz, T. Imazono, T. Kameshima, T. Kawachi, T. Kimura, T. Tajima, T. Zh. Esirkepov, Y. Fukuda, Y. Hayashi, Y. Kato","submitted_at":"2012-01-01T07:01:38Z","abstract_excerpt":"We demonstrate a new high-order harmonic generation mechanism reaching the `water window' spectral region in experiments with multi-terawatt femtosecond lasers irradiating gas jets. A few hundred harmonic orders are resolved, giving uJ/sr pulses. Harmonics are collectively emitted by an oscillating electron spike formed at the joint of the boundaries of a cavity and bow wave created by a relativistically self-focusing laser in underdense plasma. The spike sharpness and stability are explained by catastrophe theory. The mechanism is corroborated by particle-in-cell simulations."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1201.0333","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}