IHEP OpenIR  > 硬X射线调制望远镜卫星
Quantum efficiency calibration for low energy detector onboard hard X-ray modulation telescope satellite
Alternative Title硬X射线调制望远镜低能探测器量子效率标定
Zhu Y(朱玥); Zhang ZL(张子良); Yang YJ(杨彦佶); Xue RF(薛荣峰); Cui WW(崔苇苇); Lu B(陆波); Wang J(王娟); Chen TX(陈田祥); Wang YS(王于仨); Li W(李炜); Han DW(韩大炜); Huo J(霍嘉); Hu W(胡渭); Li MS(李茂顺); Zhang Y(张艺); Zhu YX(祝宇轩); Liu M(刘苗); Zhao XF(赵晓帆); Chen Y(陈勇); Zhu-Yue; Zhang, ZL; Yang, YJ; Xue, RF; Cui, WW; Lu, B; Wang, J; Chen, TX; Wang, YS; Li, W; Han, DW; Huo, J; Hu, W; Li, MS; Zhang, Y; Zhu, YX; Liu, M; Zhao, XF; Chen, Y

Low energy X-ray telescope, working over 0.7-15 keV energy band, is one of the main payloads in the hard X-ray modulation telescope satellite. The primary scientific objectives are to survey large sky area to investigate galactic X-ray transient sources as well as the cosmic X-ray background, and to observe X-ray binaries or black holes for studying the dynamics and emission mechanism in strong gravitational or magnetic field. The detector of low energy X-ray telescope is CCD236, a new generation of swept charge device, which has good time and energy resolution. Quantum efficiency (QE) of the detector has a crucial influence on X-ray spectrum fitting and absolute luminosity calculation. To provide valuable scientific data, QE should be calibrated in detail. In this paper, QE calibration is accomplished with respect to a silicon drift detector (SDD), using an Fe-55 radioactive source, at energy points Mn-K-alpha (5.899 keV) and Mn-K-beta (6.497 keV). The energies of Mn-K-alpha and Mn-K-beta are near that of iron-K, which is an important line in X-ray observation. Additionally, Mn-K-alpha and Mn-K-beta X-ray will partially pass through the depletion region of CCD236, and these energy points can be used to measure the depletion thickness. This experiment is set up in a vacuum cooling chamber. The X-ray source perpendicularly illuminates SDD and CCD236 through a small hole, whose area is far less than those of two detectors; therefore, QE measurements are irrelevant to neither the distance nor the azimuth angle between the X-ray source and the detector. For CCD236, split events should be corrected. Energy spectra of SDD and CCD236 are fitted with two Gaussian distributions, respectively, to obtain peak positions and standard variations of Mn-K-alpha and Mn-K-beta. With known structure of SDD, the QE of CCD236 can be calculated. QE values at Mn-K-alpha and Mn-K-beta are 71% and 62%, respectively. QE and temperature are uncorrelated with each other in a temperature range from -95 degrees C to -30 degrees C. According to the specific structure of CCD236 and the measured QE, without considering the effect of channel stop, the best-fit thickness of depletion region is obtained to be 38 mu m. When CCD236 is applied with different driving or substrate voltages, no obvious variation of QE is observed. It indicates that the thickness values of depletion region with high and low level voltages are equal. Furthermore, it shows that working CCD236 is deep depleted, and the thickness of depletion region will not change because it reaches its maximum, the edge of epitaxial layer and substrate layer.

Keywordcharge-coupled device quantum efficiency depletion region
Research Direction仪器
Member Type核心团队
WOS Research AreaPhysics, Multidisciplinary
WOS SubjectPhysics
WOS IDWOS:000403091100007
EI Accession Number20173103998753
EI KeywordsCalibration - Charge coupled devices - Cosmology - Electron sources - Modulation - Quantum efficiency - Radioactivity - Spacecraft equipment - Stars - Substrates - Telescopes - X ray apparatus - X ray optics - X rays
EI Classification Number622 Radioactive Materials - 655.1 Spacecraft, General - 657.2 Extraterrestrial Physics and Stellar Phenomena - 714.2 Semiconductor Devices and Integrated Circuits - 931.4 Quantum Theory ; Quantum Mechanics - 932.1 High Energy Physics
ADS CITATIONShttps://ui.adsabs.harvard.edu/#search/q=citations(%22%22)&sort=date%20desc%2C%20bibcode%20desc
major scientific facilities硬X射线调制望远镜
Citation statistics
Document Type期刊论文
First Author AffilicationInstitute of High Energy
Recommended Citation
GB/T 7714
Zhu Y,Zhang ZL,Yang YJ,et al. Quantum efficiency calibration for low energy detector onboard hard X-ray modulation telescope satellite[J]. ACTA PHYSICA SINICA,2017,66(11):112901.
APA Zhu Y.,Zhang ZL.,Yang YJ.,Xue RF.,Cui WW.,...&Chen, Y.(2017).Quantum efficiency calibration for low energy detector onboard hard X-ray modulation telescope satellite.ACTA PHYSICA SINICA,66(11),112901.
MLA Zhu Y,et al."Quantum efficiency calibration for low energy detector onboard hard X-ray modulation telescope satellite".ACTA PHYSICA SINICA 66.11(2017):112901.
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