STATUS.md

Implementation status

This document details the list of simulation modules that the Simulation Team plans to implement in litebird_sim.

List of modules

Module	Status	Priority	Notes	Links
Pointing generation	Complete			#48
Interface with Ephemerides	Complete		Through AstroPy	#48
Synthetic sky map generation	Complete		Based on PySM3	#76
Binning map-maker	Complete			#73
Destriping+calibration map-maker	Complete		Provided by TOAST+Madam	#86
				#186
Spacecraft simulator	Complete			#122
Dipole calculation	Complete			#122
Map scanning	Complete			#131
White+1/f noise generation	Complete			#100
Gain drift simulation	Complete			#243
Synthetic bandpass generation	Complete			#160, #200
Calibration non-idealities	Complete			#243
Beam convolution	Partial		Through ducc0	ducc.totalconvolve
Cosmic-ray glitch generation	Partial			No PRs yet
HWP simulation	Partial			#117
ADC simulation	Partial		Through the CR glitch generator	No PRs yet
Correlated noise generation	Missing
Dipole calibration	Missing

Beam convolution

• ducc0 already provides a 4π convolution code, and it is already available within litebird_sim
• A high-level interface to ducc0 is still missing

Destriping+calibration map-maker

• Provided by TOAST2, PR#86

• PR#186 adds the possibility to interface Madam

Calibration non-idealities

• Code available in toast-litebird
• Still not integrated in litebird_sim
• No PR yet

Cosmic-ray glitch generation

• Simulation code available
• Not integrated with the IMO nor with litebird_sim
• No PR yet

HWP simulation

• A mathematical model is already available, based on Giardiello et al. (2021).
• PR#117.

ADC simulation

• Need to simulate the following effects:

  • Signal quantization

  • Clipping of the signal outside the dynamic range

  • Non-linearity effects

• Signal clipping is already available in the Cosmic-ray glitch generator (see above)

Correlated noise generation

• Not implemented yet

Dipole calibration

• The interface with Ephemerides codes is already in place

• No PRs yet