1 / 15

Performance of the engineering model of the MAXI/SSC

Performance of the engineering model of the MAXI/SSC. Katayama H. a , Tomida H. a , Matsuoka M. a , Tsunemi H. a,b , Miyata E. a,b , Kamiyama D. b , and Nemes N. b a) Japan Aerospace Exploration Agency (JAXA) b) Osaka University http://www-maxi.tksc.jaxa.jp. Outline. Overview of MAXI

carsyn
Download Presentation

Performance of the engineering model of the MAXI/SSC

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Performance of the engineering model of the MAXI/SSC Katayama H.a, Tomida H.a, Matsuoka M.a, Tsunemi H.a,b, Miyata E.a,b, Kamiyama D.b, and Nemes N.b a) Japan Aerospace Exploration Agency (JAXA) b) Osaka University http://www-maxi.tksc.jaxa.jp

  2. Outline • Overview of MAXI • Overview of SSC • Calibration system of SSC • Performance of the SSC-EM • Screening results of the flight CCDs • Summary and future plan

  3. MAXI JEM ISS motion Overview of MAXI • All Sky X-ray Monitor on ISS • Attached to JEM-EF • Scanning all sky every 90 min • launched by HIIA Transfer Vehicle in 2008 • Mission life ~ 2years

  4. Overview of MAXI • X-ray detectors • Gas Slit Camera (GSC) • Solid-state Slit Camera (SSC) • Attitude determination • Ring Laser Gyro (RLG) • Visual Star Camera (VSC) • Thermal control system • ATCS • LHPRS

  5. ROSAT All Sky map Scientific target for MAXI • GSC (Proportional counter) • Energy range : 2-30 keV • E/DE=18%@6keV • Aeff=5340cm2 • Long-term AGN Variability • X-ray Novae • GRB afterglow • SSC (CCD) • Energy range : 0.5-10 keV • E/DE=2%@6keV • Aeff =200cm2 • Diffuse Galactic source (line mapping at OVII, OVIII) HEAO-1 All Sky map

  6. Slit Collimator 200mm CCDs Overview of SSC • Slit + Slat collimator + CCD • Number of CCDs • 16 CCDsX 2 • Sensitivity • 5.6mCrab/day • FOV • 1.5x90 • Pointing accuracy • 0.1 • Clocking • Parallel-summing • Operation Temperature • <-60 oC (LHPRS+Peltier) SSC-Z SSC-H

  7. Slats of collimator (phosphorus bronze) Tungsten slit SSC/Collimator • FOV • 1.5X90 ° • Slit • Tungsten slit • Width 2.7 mm • Collimator • 24 thin slats (~100mm thickness, 2.4mm intervals) Slit Collimator CCD FOV 1.5X90

  8. SSC-EM SSC/CCD • FFTCCD-4673 (Hamamatsu) • Pixel size • 24x24mm • Number of Pixels • 1024x1024 • Depletion layer • ~70mm • Coated with 2000ÅAl 244mm 112mm

  9. SSC Electronics • SSC Electronics (SSCE) • CCD driver / readout • Peltier control • CCD charge transfer rate = 125/62.5 kHz • Readout noise < 5e- rms • Energy resolution < 150 eV @ 5.9keV SSCE-EM

  10. Calibration system of SSC • Calibration system using fluorescent X-ray • Second targets • Al, Cl, Ti, V, Fe , Ni and Zn • Cool down -20 oC with cryogenic cooler SSC chamber Target chamber Kevex X-ray generator

  11. V spectrum Performance of the SSC-EM(1) • Energy spectrum of florescent X-rays • Ka, Kb peaks are clearly resolved • Readout noise ~ 5e- • Main peak + low energy tail • Spectra are fitted with double gaussian + constant • Energy scale • Energy resolution Cl Al V Ti Zn Fe Cr Ni

  12. Energy resolution Energy Scale Performance of the SSC-EM(2) • Energy scale • Linear function • 0.1% accuracy • Energy resolution • Estimated energy resolution at 0.5 keV ~ 80 eV > 60 eV (s0~5e-) • Measurement of low energy response below 2 keV is needed

  13. Screening results of the flight CCDs (1) • Screening of the flight CCDs at Osaka University (Miyata et. al 2004) • Flight candidate CCD 64 • Flight CCD 32 • Spare camera CCD 16 • Energy resolution • 66 % of flight candidate CCDs show a good energy resolution below 150 eV Kamiyama (2003)

  14. 70mm Screening results of the flight CCDs (2) • Quantum efficiency • Quantum efficiency at 5.9 keV is more than 90 % for almost all CCDs • 90 % efficiency corresponds to the depletion layer of 70 mm • Hot pixels and dead columns • The number of hot pixels and dead columns is very small

  15. Summary and future plan • We have developed the engineering model of the MAXI/SSC. • We achieved the low readout noise (~5e- rms) and a good energy resolution (150 eV @ 5.9keV). • We selected 32 CCDs for flight camera and 16 CCDs for spare camera. These CCDs show a good performance. Future plan… • Measurements of the soft X-ray response and quantum efficiency. • Fabrication of the flight camera is schedule to start in the end of 2004.

More Related