Instruments
MOIRCS
Spectrograph
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MOIRCS Stray Light Information PageCurrent Status and the UpdateThis page is dedicated for sending the information about the current status of the stray light and the related updates by MOIRCS team to users.
The thermal-cut filter installation plan is still continuously going on. We will announce the progress through this homepage. If the filters deliver as planned, the installation will occure around October. 2006-08-19 update: The stray-light blocking mechanism (SBM) movement test in cool condition has finished with no problem. The imaging test for SBM indicates that the level of the remaining stray light is now only 1-2% of its original level, which is consistent with the expectation for current SBM mechanism. The level of the remaining stray light is mostly well below the typical sky level, as shown below. Thus, the instrument team is well satisfied by the result of the refurbishment. The MOIRCS commissioning officer will assess the result soon, and then the final judgement for the refurbishment will officially be made.
2006-08-07 update: The stray-light blocking mechanism (SBM) has successfully installed on MOIRCS a few days ago! :-) Now MOIRCS is preparing for cooling down. Cooling process will be finished by next Monday. The mechanical test will start on that day. 2006-08-05 update: A new version of the sky spectra has provided by the MOIRCS team (courtesy of Dr.Tokoku), so the old version is now updated to the new version. In the figure the level of stray light is now explicitly shown for the observers' convenience. Please check the sky spectra page. Also, the two-dimensional view of the stray lights are now available.
The figure for HK500 will also come soon.
2006-07-29 update:
As you can guess from the sky spectra page, the level of the stray light in R500 grating is rather strong. We already started the refurbishment. Hardware installation to block stray light will occure in early August. And also, filters to suppress the affection of the stray light (thermal cut filter) have already planned to ship to Subaru soon. The filter for HK500 will hopefully be available in mid September. The filter for zJ500 (stray-light cut and order blocking) will be delayed.
Please make contact to the SS for more details. Created by Ichi Tanaka |