CaltechExperimentalGravity/system_ident

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• Designed Excitation Biased Towards High Frequencies

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  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  CaltechExperimentalGravity/system_ident#38 · Opened Aug 14, 2026

• [deferred] Hardware-state faults needing EPICS: suspension watchdog / Guardian / SDF

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  enhancement

  Difficulty 5/5 Over a week Newbie friendliness 15/100

  CaltechExperimentalGravity/system_ident#37 · Opened Aug 5, 2026

• Per-record integrity verdict + excitation-readback-vs-commanded drive round-trip

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  CaltechExperimentalGravity/system_ident#36 · Opened Aug 5, 2026

• CDS transport fault taxonomy, chunked live read with adjacency verification, and an asymmetric retry policy

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  CaltechExperimentalGravity/system_ident#35 · Opened Aug 5, 2026

• Pre-flight channel validation: existence, retrievability class, per-channel rate, liveness, injectability

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  Difficulty 5/5 Over a week Newbie friendliness 25/100

  CaltechExperimentalGravity/system_ident#34 · Opened Aug 5, 2026

• Pre-push redaction + lint pipeline — make the repo site-agnostic by construction

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  CaltechExperimentalGravity/system_ident#33 · Opened Aug 4, 2026

• CDS Backend Edge Cases

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  Difficulty 5/5 Over a week Newbie friendliness 25/100

  CaltechExperimentalGravity/system_ident#32 · 1 comment · Opened Aug 4, 2026

• Segmented ArbitraryStream excitation with a cosine on/off envelope; ArbitraryLoop as a peer mode

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  Difficulty 5/5 Over a week Newbie friendliness 38/100

  CaltechExperimentalGravity/system_ident#31 · Opened Aug 4, 2026

• [deferred] python 3.12 deployment environment — blocked on CDS support, which is NOT promised

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  Difficulty 5/5 Over a week Newbie friendliness 25/100

  CaltechExperimentalGravity/system_ident#30 · Opened Aug 4, 2026

• [deferred] Foton ZPK/SOS export + provenance manifest for a delivered fit

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  Difficulty 5/5 Over a week Newbie friendliness 25/100

  CaltechExperimentalGravity/system_ident#29 · Opened Aug 3, 2026

• [deferred] Guardian / lock-state abort, and full filter-module snapshot/restore

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  Difficulty 5/5 Over a week Newbie friendliness 15/100

  CaltechExperimentalGravity/system_ident#28 · Opened Aug 3, 2026

• [deferred] Operator-answer gate + the six hardware-only unknowns, before any live injection

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  question

  Difficulty 5/5 Over a week Newbie friendliness 25/100

  CaltechExperimentalGravity/system_ident#27 · 3 comments · Opened Aug 3, 2026

• [deferred] Site-profile layer: generalise the CDS backend beyond the 40m

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  Difficulty 5/5 Over a week Newbie friendliness 28/100

  CaltechExperimentalGravity/system_ident#26 · Opened Aug 3, 2026

• Does the trunk-based rule still hold for parallel (multi-developer, multi-agent) development?

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  question

  Difficulty 5/5 Over a week Newbie friendliness 35/100

  CaltechExperimentalGravity/system_ident#25 · Opened Aug 3, 2026

• Stage I: documentation — register CDSBackend, correct its docstring, record the non-defects

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  documentation

  Difficulty 4/5 3-5 days Newbie friendliness 45/100

  CaltechExperimentalGravity/system_ident#24 · Opened Aug 3, 2026

• Stage H: py3.9 / numpy 1.22 / scipy 1.8 / control 0.9 compatibility + a py3.9 CI leg

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  bug

  Difficulty 4/5 3-5 days Newbie friendliness 42/100

  CaltechExperimentalGravity/system_ident#23 · 1 comment · Opened Aug 3, 2026

• Stage H: deployment environment — probe a modern CDS-capable env, else clone the site CDS env

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  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  CaltechExperimentalGravity/system_ident#22 · 4 comments · Opened Aug 3, 2026

• Stage G: EXIT GATE — full-stack CDSBackend run through TwinTransport against x1hsts

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  CaltechExperimentalGravity/system_ident#21 · Opened Aug 3, 2026

• Stage F: wire --cds (CLI, build_cds_backend, BACKENDS registry, mandatory channels.drive)

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  Difficulty 5/5 Over a week Newbie friendliness 42/100

  CaltechExperimentalGravity/system_ident#20 · 1 comment · Opened Aug 3, 2026

• Stage E: an out-of-band STOP path must be mandatory on the hardware backend

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  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  CaltechExperimentalGravity/system_ident#19 · 1 comment · Opened Aug 3, 2026

• Stage E: fail fast on a bad Pyy, and add --skip-background (1.7 h before the first injection)

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  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  CaltechExperimentalGravity/system_ident#18 · Opened Aug 3, 2026

• Stage E: per-injection human-approval gate; reject --yes on hardware; fix _confirm(twin=True)

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  Difficulty 4/5 3-5 days Newbie friendliness 52/100

  CaltechExperimentalGravity/system_ident#17 · Opened Aug 3, 2026

• Stage D: lifecycle — nothing stops an excitation on Ctrl-C; idempotent stop; snapshot/restore

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  bug

  Difficulty 4/5 3-5 days Newbie friendliness 55/100

  CaltechExperimentalGravity/system_ident#16 · 1 comment · Opened Aug 3, 2026

• Stage D: read cache — simultaneous mode is currently slower than sequential (7.0 h -> 2.5 h)

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  Difficulty 5/5 Over a week Newbie friendliness 45/100

  CaltechExperimentalGravity/system_ident#15 · 1 comment · Opened Aug 3, 2026

• Stage D: CDSBackend.read() invariants — never synthesise X, never GPS-align

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  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  CaltechExperimentalGravity/system_ident#14 · 1 comment · Opened Aug 3, 2026

• Stage D: CDSBackend construction + staging (channel maps, rate/periodicity checks)

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  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  CaltechExperimentalGravity/system_ident#13 · 1 comment · Opened Aug 3, 2026

• Stage C: TwinTransport — route CDSBackend at a compiled rtsfreerun model

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  CaltechExperimentalGravity/system_ident#12 · Opened Aug 3, 2026

• Stage C: CDSTransport seam + AWGNDSTransport (awg/cdsutils/gpstime)

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  CaltechExperimentalGravity/system_ident#11 · 1 comment · Opened Aug 3, 2026

• resample_poly destroys the drive's periodicity (53% on the last period) — live in RTSfreerunBackend

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  bug

  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  CaltechExperimentalGravity/system_ident#10 · Opened Aug 3, 2026

• Ramp contract: _soft_start_stop is wrong for a looping transport (2.8e-1 FRF error)

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  bug

  Difficulty 4/5 3-5 days Newbie friendliness 55/100

  CaltechExperimentalGravity/system_ident#9 · 1 comment · Opened Aug 3, 2026

• H_err and coherence are structurally blind: a 200%-wrong FRF reports coherence 1.00000

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  bug

  Difficulty 5/5 Over a week Newbie friendliness 35/100

  CaltechExperimentalGravity/system_ident#8 · 1 comment · Opened Aug 3, 2026

• loop.py:419-423 keeps the span, not the contiguous run, of full-energy periods

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  bug

  Difficulty 4/5 3-5 days Newbie friendliness 52/100

  CaltechExperimentalGravity/system_ident#7 · Opened Aug 3, 2026

• P_eff < 2 sets var_H = 0, which the 1e-9 floor turns into weight 4.6e19 forever

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  bug

  Difficulty 3/5 1-2 days Newbie friendliness 58/100

  CaltechExperimentalGravity/system_ident#6 · Opened Aug 3, 2026

• Stage A: fake CDS transport test harness (awg/cdsutils/gpstime stubs)

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  enhancement

  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  CaltechExperimentalGravity/system_ident#5 · 1 comment · Opened Aug 3, 2026

• Additons regarding the amplitude of excitation

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  CaltechExperimentalGravity/system_ident#4 · 2 comments · Opened Aug 3, 2026

• Invite: real LIGO O3/O4 calibration-line heights (physical units) for the DARM twin

  May be free again @rxa254 claimed this 62 days ago, and no pull request is open. Open

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  CaltechExperimentalGravity/system_ident#3 · 1 assignee · Opened Aug 1, 2026

• Reducing Dependence on Model Completeness.

  May be free again @Nangush claimed this 97 days ago, and no pull request is open. Open

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  enhancement

  CaltechExperimentalGravity/system_ident#2 · 1 assignee · Opened Jun 26, 2026

• Improve FRF estimation by using GraFIT method.

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  CaltechExperimentalGravity/system_ident#1 · 2 comments · Opened Jun 26, 2026