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The Unittest_INHERIT_DIAPHRAGM Instrument

Whole-component INHERIT: Diaphragm (DEFINE COMPONENT Diaphragm INHERIT Slit)

Identification

• Site: Tests_grammar
• Author: Peter Willendrup
• Origin: DTU
• Date: Oct 7th, 2026

Description

Unit test for whole-component inheritance, see
docs/GRAMMAR/ADR-records/ADR_20261007_GRAMMAR_FIXES.md

Diaphragm.comp is just "DEFINE COMPONENT Diaphragm INHERIT Slit" + END,
so all of its code sections must come from Slit.

One unit of intensity is emitted uniformly from a 1x1 m square:
- a Slit of 0.5x0.5 m passes 1/4:    AfterSlit_I = 0.25
- a Diaphragm of 0.25x0.25 m passes 1/16 of the source: AfterDiaphragm_I = 0.0625

Before the fix, a component inheriting all of its code got none of it, so
the Diaphragm let everything through (AfterDiaphragm_I = 0.25).

Examples

(Test cases in bold)

• Test: Detector: AfterSlit_I=0.25
• Test: Detector: AfterDiaphragm_I=0.0625

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
Pp0	1	Dummy input parameter used internally	0

Links

• Source code for Unittest_INHERIT_DIAPHRAGM.instr.
• docs/GRAMMAR/ADR-records/ADR_20261007_GRAMMAR_FIXES.md

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[ Identification | Description | Examples | Input parameters | Links ]

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Last Modified: Monday, 02-Nov-2026 21:43:07 CET