SUBARU Instrument Status and Prospects Hiroshi TERADA and
SUBARU Instrument Status and Prospects Hiroshi TERADA and the members from Science Operation Division New CCD Upgrade Major Problem and Upgrade of MOIRCS Suprime-Cam MOIRCS Main Issue Operating Engineering grade array on Channel-1 due to array problem. Characteristics of Channel-1 array ■ Ring shaped anomaly on dark frame High dark current ( ~20 e- / sec) High “reset anomaly” for the first image High noise level and latents ■ Sensitivity, linearity, readout noise As long as the anomaly region is avoided, Q. E. ~75% ~82% Ch. 1 Ch. 2 1% Non-Linearity ~74, 000 e~110, 000 e- Project Status Final evaluation and performance confirmation is on-going Dark pattern (600 s): The data were taken with NDUMMYREAD=2 option under 8 -times multi-sampling. The image is displayed with the range of 0 -512 ADU. Readout Noise 27. 7 e 29. 5 e. New CCDs and Dewar Note Quantum Efficiency @ -100℃ Although performance level of the normal regions is as good as Channel-2, the anomaly region spreads over almost the entire array. Therefore, special caution should be paid if Channel-1 data is used. Linearity measurement for Channel-1: Dome image in K-continuum filter with NDUMMYREAD=2 is used. The residual from the linear fitting is shown. The conversion factor for Ch. 1 is 2. 95 e-/ADU. For more detail information, please refer to http: //subarutelescope. org/Observing/Instruments/MOIRCS/chip 1 info. html. Upgrade High Dispersion VPH Grisms (R=3, 000 @ J- and H-bands) Will be open to public use from S 08 B (limited number of proposals) Note that the sensitivity curve highly depends on the slit position Readout time: 20 sec (detailed tuning planned) Readout noise: ~5 e. Preparation done for testing on Hilo simulator Schedule Plan 2008 Early Jun Start to replace into the new CCDs system after the last observing run. 2008 Late July Readout Noise Evaluation Engineering run For up-to-date detailed information, please refer to http: //subarutelescope. org/Observing/Instruments/SCam/upgrade. html. FOCAS VPH grism (J) Total efficiency of VPH grisms Schematic view for efficiency shift with different slit position. Project Status Purchase of CCD chips is on-going. CCDs will be the same as the ones for Hyper-Suprime. Cam. Thickness of the depletion layer => TBD (200 um or 300 um) ※ t 300 um: better sensitivity, less fringe in red, but worse image quality Schedule Plan 2008/05, 06: Delivery of New CCDs --2008/09: Evaluation of the new CCDs & fabrication of new dewar --2009/03: Assembly, control software check, and laboratory test --2009/08: Engineering run Newly Opening of AO 188 Prospects ■ Open after S 09 A IRCS+AO 188 Status Will be open from S 08 B (Shared risk) Finer pixel scale (12. 5 mas/pix; >1. 8 um) Coronagraph mask (0”. 2, 0”. 5, 0”. 8) Polarimetry (0. 9 -5. 5 um) with limited nights, proposals, and functions Image. Rotator in AO 188 is brand-new. ⇒ Caution needed for image rotation. E JKL’ N JHK ■ Recoating Image. Rotator at Ns. IR ⇒ Better sensitivity for IRCS @ thermal band High Resolution Upgrade Status Ion beam dry-etching method established for Si immersion grating 23” x 23” 20 mas camera 53” x 53” 52 mas camera (J, H, K-bands) Test piece for Si immersion grating and its performance F-conversion Optics Coronagraph mask Si Immersion grating High Resolution Spectrograph Unit No Major Status Change COMICS HDS Status Four cold head failures on the imaging side occurred during S 07 A & B. ⇒ its cause is still under investigation Now stable after replacing all the components related to the cooler. Status Continue stable operation in 2007. To ensure high precision spectroscopy, detailed evaluation and investigation of linearity is on-going. Decommissioning CISCO AO 36 Status No longer available from S 07 B. Plan Will be transferred to University of Tokyo for the other project. Status Operatoinal within S 08 A with CIAO. Plan No longer available from S 08 B. CIAO will be opened without AO function. SUBARU USER’S MEETING 2007 NAOJ in Mitaka: 2008/01/30, 31
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