Harlequin is a Julia package that simulates the operations of a space mission measuring the CMB. The program includes the following basic features:

• Generation of pointing information;
• Simulation of the CMB dipolar signal;
• Production of maps.

If you are looking for a more mature and comprehensive toolkit, which includes several more features, be sure to have a look at TOAST. This includes a full-scale map-maker (MADAM), beam convolution, half-wave plate simulation, atmospheric effects (useful for ground experiments). Moreover, it uses Python instead of Julia, and it is much better supported on HPC superclusters.

A few advantages of Harlequin over TOAST are the following:

• It works under Linux, Mac, and Windows;
• It strives to have comprehensive documentation;
• It can use the Julia ecosystem, including awesome tools as plot recipes, interactive widgets, error propagation, etc.

Start the julia prompt and run the following commands:

import Pkg
Pkg.add("Harlequin")

It is available both for the stable and dev branches.

Harlequin is released under a permissive MIT license. See LICENSE for more information.