Tag Archives: Spectrograph

Subaru renovated a dome floor for the PFS Spectrographs / 分光器設置室完成

In July 2017, the Spectrograph Clean Room  was finally built up on the fourth floor of the dome building at Subaru Telescope! Spectrograph Clean Room at Subaru Telescope It has been one year and a few month since the previous instrument was cleaned up from the floor, in order to accommodate four PFS spectrographs. Since then, floor has been reinforced,… Read more »

Fiber Cable: Slit Assembly of Spectrograph arrived in Marseille / ファイバーケーブル:分光器のスリット部がフランスに到着

For the PFS instrument, the lights from about 2400 astronomical objects are designed to be delivered through long fiber cable from the prime focus of the telescope to the spectrograph modules on the fourth floor in the dome building. This fiber cable subsystem, which is about 65m long in total, consists of 3 parts: (1) short cables accommodated into the… Read more »

Joint Work for Spectrograph Development at LAM / マルセイユ天文台での分光器開発強化週間

At Laboratoire d’Astrophysique de Marseille (LAM), PFS Spectrograph Module (SM) is fully integrated and its performance is validated. As a part of these processes, two visible-red camera units are being tested; one is for thermal performance test and the other is for optical performance test.  From 19th to 29th June, we got together at LAM and dedicated ourselves to joint… Read more »

Commissioning of IR detector at JHU / ジョンズ・ホプキンス大学で赤外検出器実験開始

PFS is a spectrometer that disperses light and measures the intensity as a function of wavelength using photosensitive detectors. The operational bandpass for the PFS instrument covers the wavelengths from 380nm to 1260nm. The light delivered to the spectrograph is initially separated into three channels of blue, red, and near-infrared (NIR) by two dichroic mirrors. Each channel is deflected to… Read more »

Spectrograph Integration & Test at LAM / マルセイユ天文台での活動:分光器の組み上げ試験

Among the PFS instrument subsystem, four spectrographs are developed under the leadership of LAM (Laboratoire d’Astrophysique de Marseille). Since 2015, the first spectrograph module has been integrated and tested for its performance. In this article, we’ll talk about integration and test activities at LAM. Below photo shows the Visible-Red camera unit under assembly: optical components were accommodated in the cryostat… Read more »

Installation of Spectrographs Clean Room Crane / 分光器設置室用クレーン設置

The integration of the Spectrographs Clean Room has been progressing at the Subaru Telescope observatory since last May, when the floor of the dome building was cleaned up. Recently, a crane has been installed to the ceiling structure of the spectrograph floor. This 500kg-capacity crane will be used to carry the individual components and sub-assemblies of the spectrograph module such… Read more »

Renovation for the PFS spectrograph system / PFS分光器システムを迎えるために…

The PFS spectrograph system, consisting of four identical modules, will be accommodated in a designated clean room on the fourth floor of the Subaru telescope enclosure building. Envisioning the delivery of the first modules in 2017, we have been developing the design and implementation plan of the floor and clean room. After we had a design review meeting in August… Read more »

Updates on Integration and Test of Spectrographs / 分光器組み上げ試験は今・・

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 (http://pfs.ipmu.jp/blog/2015/11/p124)…. Read more »

Thermal validation of the Visible Camera Unit is in progress / 可視光域カメラユニットの熱試験が進行中

— 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). http://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. / 分光器の部品・ダイクロイックミラーの試作品が完成しました

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. http://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 »