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PIMP - Pet(it) Interferometer Martin-Puplett

The PIMP is a compact Martin Puplett Interferometer (MPI) constructed in house by Institut Neel and IRAM. It was specifically designed to be able to perform measurements of the NIKA2 transmission directly at the telescope in complement to those performed at the lab with the Neel-LPSC MPI.

Quick installation guideline with photos

A couple of photos can help for the step-by-step installation of PIMP:

PIMP on its frame

PIMP installed PIMP installed, but unconnected

PIMP minimal spacing to NIKA2 window

PIMP Raspberry control unit and Electronics plugged Raspberry display of running scan Electronics box front view Electronics box back view, unplugged

PIMP external optics 1 PIMP external optics 2 PIMP convergent lens PIMP window without external optics

How to setup the PIMP with the acquisition

when the pimp is plugged on the NIKA2 network, it sends various kind of data to the network (scan start and stop, the speed, frequency and so on). These data can be read by the NIKA2 acquisition, providing that there's the correct variable declarations in the ini file. The Pimp is treated by the acquisition like an "instrument", exactly like each Nikel board is treated. If you look in the folder where the ini file are you will find 3 ini files that contain PIMP specific variable declarations. You will have to use them. If you are not so sure about these ini file you can have help from Juan, Martino, and Alessandro.

Measurements of the NIKA2 bandpasses

2018, 2019 campaigns

March 2025 campaign

After some iterations, the Raspberry was setup with the following parameters:

Appendix

NIKA2 bandpasses before the upgrade of 3/2025

Documentation on wiki.iram.fr

Some documentation on PIMP is available in the NIKA2 private wiki documentation page. See

Daily reports wiki pages of measuring campaigns


Created: 2025.Mar.20 created by CK, initially based on various mails from SL.

pimp (last edited 2025-03-26 08:36:45 by NikaBolometer)