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| Planck High Frequency Instrument | |
|---|---|
| Name | Planck High Frequency Instrument |
| Mission | Planck |
| Operator | European Space Agency |
| Manufacturer | Astrium |
| Launch | 14 May 2009 |
| Launch site | Guiana Space Centre |
| Orbit | Sun–Earth L2 |
| Mission duration | 4 years (operational cryogenic lifetime) |
Planck High Frequency Instrument The High Frequency Instrument provided sensitive millimetre and submillimetre measurements on the Planck mission, mapping anisotropies of the Cosmic microwave background across a wide frequency range. Designed in collaboration among European Space Agency, Centre National d'Études Spatiales, Jet Propulsion Laboratory, and multiple European research institutes, the instrument complemented the Low Frequency Instrument to deliver high‑resolution sky maps used by teams at Max Planck Institute for Astrophysics, Institut d'Astrophysique Spatiale, and University of Cambridge. Its data underpinned key results published by the Planck Collaboration and used by cosmologists at Princeton University, Stanford University, Harvard University, and observatories such as Atacama Cosmology Telescope.
The instrument served as Planck's high‑frequency focal plane, observing bands centered near 100–857 GHz to separate Cosmic microwave background signals from foregrounds such as emission from interstellar dust, Sunyaev–Zel'dovich effect in galaxy clusters, and synchrotron from supernova remnants. It worked together with the Low Frequency Instrument to provide multi‑frequency component separation for cosmological parameter estimation used by teams at European Space Agency science centers, NASA, and university groups. By mapping temperature and polarization anisotropies, the instrument contributed to constraints on the ΛCDM model, measurements of Hubble constant tensions, and studies of large‑scale structure connecting to surveys like Sloan Digital Sky Survey and Dark Energy Survey.
The instrument consisted of a cold focal plane mounted behind the Planck telescope's Gregorian telescope optics, incorporating feed horns, band‑defining filters, and dichroic elements. Its optical chain interfaced with the High Frequency Instrument's cryogenic enclosure and the spacecraft's V-groove radiator thermal shielding. The mechanical layout was developed by industrial partners including Airbus Defence and Space affiliates and scientific consortia from Cardiff University, University of Oxford, and University of British Columbia. Electronics subsystems included readout modules, bias supplies, and digital processors integrating heritage from missions like Herschel Space Observatory and COBE.
The detector array used bolometric detectors based on spider‑web and polarization‑sensitive designs fabricated by teams at Jet Propulsion Laboratory, SRON Netherlands Institute for Space Research, and University of British Columbia. Transition‑edge sensors and Neutron‑Transmutation Doped thermistors were read out with low‑noise electronics. The cooling chain achieved sub‑Kelvin temperatures using a combination of a passive V-groove radiator, a hydrogen sorption cooler, a 4 K mechanical cooler, and a dilution refrigerator developed with engineering assistance from Thales Alenia Space and CEA Saclay. Thermal interfaces and vibration control were coordinated with ESA mission engineering groups and tested at facilities such as ESTEC and national cryogenic laboratories.
Instrument calibration used celestial calibrators including the Cosmic microwave background dipole, observations of Jupiter, Mars, and infrared sources characterized by teams at European Southern Observatory. The Planck data processing pipeline was run by the Planck Collaboration Data Processing Centres at institutions like Max Planck Institute for Astrophysics, CNES, and University of Barcelona, employing mapmaking algorithms, beam reconstruction, time‑ordered data filtering, and component separation methods such as Commander, SMICA, and NILC. Calibration addressed beam asymmetries, time constants, and detector nonlinearity; systematic error budgets were assessed by instrument scientists and validation groups at University College London and Caltech.
High‑frequency maps enabled precise measurements of CMB temperature and polarization power spectra, refining estimates of parameters in the ΛCDM model and informing debates over inflation scenarios. The instrument's bands were crucial for mapping thermal emission from interstellar medium dust, cataloguing compact sources in the Planck Catalogue of Compact Sources, and detecting the Sunyaev–Zel'dovich effect in hundreds of galaxy clusters used by teams at XMM‑Newton and Chandra X-ray Observatory for multiwavelength studies. Results fed into analyses by the Planck Collaboration that impacted work at Institute for Advanced Study, Perimeter Institute, and national science agencies.
The instrument achieved beam sizes of arcminute scale at the highest frequencies, with detector sensitivity limited by photon noise and residual systematics such as cosmic ray hits and microphonic coupling. Performance was constrained by the finite lifetime of the dilution refrigerator and by foreground complexity from diffuse dust and extragalactic infrared sources catalogued with assistance from Herschel Space Observatory teams. Data releases included quantified uncertainties affecting cosmological parameter covariance matrices used by groups at Cambridge University and University of Chicago.
Development involved international consortia coordinating design reviews, qualification campaigns, and flight acceptance tests at facilities including ESTEC, RAL, and national metrology labs. Integration with the Planck satellite and final verification occurred at the Guiana Space Centre prior to launch aboard an Ariane 5 launch vehicle. In‑flight operations were managed from ESA mission control with science planning by the Planck Collaboration and operational support from teams at CNES and NASA centers. Post‑mission archiving and legacy exploitation continue through archives at ESA Science Data Centre and partner institutions.
Category:Cosmic microwave background instruments Category:European Space Agency spacecraft instruments