Pith Number

pith:TCCC5BB5

pith:2025:TCCC5BB5NFLAFAKCTUGL7K4NIO

not attested not anchored not stored refs pending

Constraints on the magnetic field evolution in tokamak power plants

Allen H Boozer

Boozer coordinates yield exact expressions for Faraday's law and related quantities that constrain magnetic field evolution in tokamak power plants.

arxiv:2507.05456 v8 · 2025-07-07 · physics.plasm-ph

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\pithnumber{TCCC5BB5NFLAFAKCTUGL7K4NIO}

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Record completeness

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3 Author claim open · sign in to claim

4 Citations open

5 Replications open

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The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

Expressions for Faraday's Law, the safety factor, and the internal inductance derived in Boozer coordinates provide constraints useful in the design of tokamak power plants and explain why disruptions are common, why current-profile control may be required especially during shutdowns, and why only pulsed tokamaks seem possible.

C2weakest assumption

That the Boozer coordinate system, established for stellarator equilibria, directly yields simple exact expressions for Faraday's Law and related quantities in tokamak power-plant-relevant conditions without additional modeling assumptions that break under realistic plasma evolution.

C3one line summary

Boozer coordinates applied to tokamaks yield constraints on magnetic field evolution that limit steady-state operation and highlight requirements for current control to avoid disruptions.

Receipt and verification

First computed	2026-06-26T00:15:22.273771Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

98842e843d69560281429d0cbfab8d43a74c95561b251d536acd3ed0e4b76092

Aliases

arxiv: 2507.05456 · arxiv_version: 2507.05456v8 · doi: 10.48550/arxiv.2507.05456 · pith_short_12: TCCC5BB5NFLA · pith_short_16: TCCC5BB5NFLAFAKC · pith_short_8: TCCC5BB5

Agent API

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/TCCC5BB5NFLAFAKCTUGL7K4NIO \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 98842e843d69560281429d0cbfab8d43a74c95561b251d536acd3ed0e4b76092

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b12fc6b1c867c6ab66a92d46c9910c40e75ce487b5b173d7875879fb6f4e17ff",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.plasm-ph",
    "submitted_at": "2025-07-07T20:17:20Z",
    "title_canon_sha256": "a2dbae92ffed8e978fa98921fe8c92581b8936e0e7d830b4b389901848ddebef"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2507.05456",
    "kind": "arxiv",
    "version": 8
  }
}