Category Archives: Development

The PFI test stage and environment control chamber have been fully assembled.

Written by Shiang-Yu Wang (ASIAA, Taiwan) One of the PFS subsystems called Prime Focus Instrument (PFI), which will be installed to the prime focus at the Subaru telescope, comprises of a lot of different modules such as ~2400 fibers and their positioners, 6 cameras for acquisition and guide of a targeted sky field. These modules will be assembled at various… Read more »

Mass production of fiber positioners have started

PFS will accurately position 2400 fibers to stars and galaxies on the sky in the field of view of about 1.3 degree diameter and deliver spectra for such a large number of objects at one exposure. The key component of this fiber positioning process is the actuator named “Cobra”. In the previous article, we described our testing activities to characterize… Read more »

Updates on Integration and Test of Spectrographs

From David Le Mignant (LAM) As of early 2016, several PFS spectrograph activities are on-going in parallel in France, led by Laboratoire d’Astrophysique de Marseille (LAM) with the support from the other PFS members. Among them, two major items are: 1) the thermal validation for the Visible Camera Unit: Since last year we have been undertaking this validation process (https://pfs.ipmu.jp/blog/2015/11/p124)…. Read more »

Network Connection Test at Subaru Telescope

Subaru Telescope, where PFS will be installed, has been used for cutting-edge researches in astronomy and astrophysics since 1999 when it started its science operation. Because we will install a brand-new, state-of-the-art instrument on the more than 15-years old telescope, we sometimes run into difficulties due to “generation gap”. Today we will talk about network connection, one of many such… Read more »

Thermal validation of the Visible Camera Unit is in progress

— From David Le Mignant (LAM) We talked about the cooling verification of the cryostat body of the Visible Camera Unit for the Spectrograph at Johns Hopkins University (USA). https://pfs.ipmu.jp/blog/2015/09/p68 After that process, the cryostat body was shipped to Laboratoire d’Astrophysique de Marseille (LAM) in France, where other parts are also delivered from the collaborators and a complete Visible Camera… Read more »

A prototype dichroic mirror is now ready for integration to Spectrograph.

As introduced in the previous post, a various parts for Spectrograph are arriving in France, where we started building up the Spectrograph and verifying its performance. https://pfs.ipmu.jp/blog/2015/08/p17 This time, we are talking about dichroic mirror as one key parts in the spectrograph. PFS delivers spectra covering such a wide range of wavelengths as from visible to near infrared with a… Read more »

The fiber positionar is under the experiment

One of the unique features of the PFS instrument is its multiplicity: Using 2400 fibers, a number of spectra of stars and galaxies can be obtained simultaneously. The actuator named “Cobra”, which is comprised of two motors, is used for moving each fiber to the position of an astronomical object of interest on the focal plane. The “patrol area”, where each fiber attached to Cobra… Read more »

Cooling Experiment of Camera Modules is Going on

The cooling experiment of camera modules for spectrograph is going on at Johns Hopkins University, the US. In order to observe faint stars and galaxies, astronomical detectors in visible and near infrared are used under very low temperature (-100 degree Celsius / -148 degree Fahrenheit or less than it) and high vacuum (less than one billion of atmospheric pressure). By this experiment… Read more »

First Spectrograph Module started to be built

The PFS project has reached a major milestone toward completing the instrument. PFS has four identical spectrograph modules in order to observe about 2400 astronomical objects. Among them, various modules for the first spectrograph are coming to a clean room at Marseille Observatory (LAM) in France from our team over the world. (delivery of modules) Below are the pictures of the modules;… Read more »