{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"8d92659b622b7994eaec311070898eaf7299db39aff4841174aef594b852e92d","created":"2026-10-03T07:18:08Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"2b6e939a1d9bdf199fa4d6f60a53c3542178f96c4b74c4764c2bfe76bbbd3c3c","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"plasma.edge-pedestal-elms.elm-free-reactor-regime","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"Several tokamak operating modes keep good confinement without large ELM bursts, but each has been found only under conditions that a reactor may not reach. Whether any of them survives at reactor density, low rotation and a cool divertor is unknown.","posed_since":"","precise":"Candidate regimes are QH-mode (edge harmonic oscillation), I-mode, EDA H-mode, small or grassy ELM regimes (quasi-continuous exhaust) and negative-triangularity L-mode edges. Determine whether at least one achieves $H_{98}$ near 1, no type-I ELMs and a detached divertor simultaneously at reactor-relevant $n_{e}/n_{G}$ of about 0.8 or more, low external torque, high separatrix density and pedestal collisionality as low as ITER $Q = 10$. An answer is a demonstrated discharge meeting all conditions on one device, or a validated stability analysis showing that each regime's access window excludes them.","problem_ref":null,"references":"","settled_by":"A steady discharge meeting all listed conditions simultaneously, together with a validated model of its access window extrapolated to ITER.","status_note":"","title":"Is any ELM-free or small-ELM regime compatible with reactor conditions","topic_ref":"037681ebe2f068d361e19b0b90c7ad8b9281d3aee6de68370b6a285f803d9ac9"},"content_withheld":"false","files":[],"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"20533b0e83e6778a8547a5f7ebb3b815e42e6969f80fff7e3f6449d666011b2b","schema":"pubphys.attested/1"},"id_token":null,"id_token_withheld":"false","envelope":{"attested_hash":"45442612aa3e7d1accb2fbe57cc9820e6c645216ad60f8af09d9da76e1597829","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"9EA17nKN16jln9z9LPAELtzuHXxoWrnO3aFDJ6DS2O59Azs0TUyksxhkak3npaXumsXIk9M_0JzZakk2IAl6CA"},"schema":"pubphys.envelope/1"},"ots":{"attested":["AE9wZW5UaW1lc3RhbXBzAABQcm9vZgC_ieLohOiSlAEIRUQmEqo-fRrMsvvlfMmCDmxkUhatYPivCdnaduFZeCnxIEU_HtO1LqzZlLor_8UxtNEfoRh-VOf6LRWfCx1-XPPsCPEgASb8432U6U7Z9ktQwVfLKgasmpn16oIAPT8oPtcBPNwI8SAginaiWrqpPZ5fzvAVk_okU-TWc7PWMTotSERU7g93agjxIFSazwZrNcJJFWmUMrxUcpEM95d2br6kudMRcftFz9XDCPEgpTwNvPSXoI80KIHf3E-_zzHkVx3ceTkiynZSrDLUubII8SDqh7ZKV0FP9bj6-wHJxi1ULARNTFUNvmnF519BY4N0-gjxIO0D7CRgiEuDrwg_IQ4Djq6tg8Px2LVb4_GnOkvNiXBICPAgDwiS_6mbTnnYK_oMGqQLov2YRVYIj9Er1NWLuDHHhV8I8CDcBxRb7fDApTWNNvjZ_r2lDpQT60DYte3pStKjciGgOAjwIK9SXvHBwgJE5CknXtp2lOqKcbHlJ-ncP9sNjnTHUJsmCPEgytIBB3x7TFDT-XqOV-9vpqw1NKoAu0dhtsCbAMql2L0I8CCtNZgmApuKULvPC9nsMCaM05arV-F3o5FTlnJCnRvdMgjwIBGYo5Vxy-d7U5zKv5vp3Ii7hJPH_BDLCzA13c47p9q7CP_wCHbghVgOFMuNCPAQPZK2lHbTMqcCYUotzOQcmQjwIJ7ruRIs6HnufKxCpmLUgeUl0aUu0ov4_3PqcppS-bddCPEgI530vHzdwz_3o9jYQ3WablSaV64Wfn7Pmby5WLyI-A0I8QRqwKw78AhITF7Tr3a1xACD3-MNLvkMjiwraHR0cHM6Ly9ib2IuYnRjLmNhbGVuZGFyLm9wZW50aW1lc3RhbXBzLm9yZ_AIfrBm5kAMH2cI8BAGKsbR52Yj2ZyRBj8fybyrCPEg15Kg4Ne2LGSKxM-WnEce5gVwiluZijYEWJ8P_lNnKQ4I8QRqwKw68AhHyujKJ6ONvACD3-MNLvkMji4taHR0cHM6Ly9hbGljZS5idGMuY2FsZW5kYXIub3BlbnRpbWVzdGFtcHMub3Jn"],"envelope":["AE9wZW5UaW1lc3RhbXBzAABQcm9vZgC_ieLohOiSlAEIXlZgUQhJBqPCxKD2ggWzw2AJ1F9rd0u04aiyEHAumLPxIF4qx40rPlfPAzNho9w-_H8PXrH-fMdUDkIYOE-736YnCPEgIWedWZD76D9Y3lyH-lOjm-aOz-UFYGvuQARByhwnV2gI8SAHRhNdUf6OqYaZhCJqzUyy-EdiKYuzXgSfcrum82KWzAjxIALm0mFZVkHQTjqTnqZoGoQeAUTZvQ1j24A29NAJmW_NCPAgR5y3O2hwPyeBTwNy8kD8XFRzdlsg3y_OMJpypErimZMI8CCL_EDkCssOXbg4vDbxyEKBP8nbQKKXbwKWyEP0FEdh0wjwIA39tRHVS-t0TQxXFjjmNWwvQiyD5mU_N02z3yp2_tlNCPAgOatp97sEGfSkPectTIcXn_UGSclxLvXC9ouOsHYFkl8I8CBPLfD1TsHdjhkyZ9iTm9m5GTCSBT-7GhYUfap1vptsnQjxINBAKCf3cKChW811B6TkfdlxdONUiLQA88uJMnPer4KuCPEgytIBB3x7TFDT-XqOV-9vpqw1NKoAu0dhtsCbAMql2L0I8CCtNZgmApuKULvPC9nsMCaM05arV-F3o5FTlnJCnRvdMgjwIBGYo5Vxy-d7U5zKv5vp3Ii7hJPH_BDLCzA13c47p9q7CP_wCHbghVgOFMuNCPAQPZK2lHbTMqcCYUotzOQcmQjwIJ7ruRIs6HnufKxCpmLUgeUl0aUu0ov4_3PqcppS-bddCPEgI530vHzdwz_3o9jYQ3WablSaV64Wfn7Pmby5WLyI-A0I8QRqwKw78AhITF7Tr3a1xACD3-MNLvkMjiwraHR0cHM6Ly9ib2IuYnRjLmNhbGVuZGFyLm9wZW50aW1lc3RhbXBzLm9yZ_AIfrBm5kAMH2cI8BAGKsbR52Yj2ZyRBj8fybyrCPEg15Kg4Ne2LGSKxM-WnEce5gVwiluZijYEWJ8P_lNnKQ4I8QRqwKw68AhHyujKJ6ONvACD3-MNLvkMji4taHR0cHM6Ly9hbGljZS5idGMuY2FsZW5kYXIub3BlbnRpbWVzdGFtcHMub3Jn"]},"log":{"leaf_index":"1832","tree_size":"2123","proof":["53c0f613a5c41096d1ecbdad195c37115b8a159b3d6b7c39fe103ee879c06de0","1d5b36de7e4b65623e578630fdd9964ca9b0a3f4e0280bcef1117194ce3b4688","99bf03792590edf31916c86adc2f796ed6c31aed529d7f30da95e56df14b9663","dcf8a7c5e9f787d760b714f631c2fa2ad918811c3c4fa9bae075104494c345ef","018a81dfe575e4b8fdb2a66010332c1cc819441834197671ca4cfa8c4089206e","8952b983f2ce281ad5f10946422f9daa7580c90cf1398ccd6b59b528436b033b","b73402096879b4fe9cefd6400a0af7275456693eb436b0ec30da9a5e8b5c5f74","14dd2e4d4f3bd929d86d1750195d13ee9ec70c54f432e6d8f0e58a81711d074d","89c88540ca484f1a3c3976a552c40aeb6520d68a5a5ecc248a08fd399e828af4","35f1d0a5e69da98f9992a5251e4e3df1933c2f26543c7a40b2681ecfa194443a","2b97406e15e4d451a5450b3b53b677749fe0fa759579146dbfa1544c1e61a0ed","addcf2e0ff7974e4aa99af5e30d409f90d9f4311a4d85f5baf3e125eeb45b4c1"],"checkpoint":"pubphys.com/log/v1\n2123\npXVcluz7BF4vgChQs6lShuU0386gCH0RxrC1sxyE3rI=\n\n— pubphys.com/log/v1 JFPwIOLzsUD22XoTVyTfk/FMVj/u3f3DxZk4V/Ws10KVSS+8WQSwhunQ//EAhyS9Td5CyM0E++85GMezmKd8240j9Q8=\n","promise":null},"orcid_key_evidence":[],"attesting":null}