Current status of SRG/ART-XC

Transcription

1 Current status of /ART-XC Mikhail Pavlinsky (IKI, Moscow) AXRO-2014, 10 December

2 Roscosmos Space Research Institute, IKI, Moscow Lavochkin Association, Khimki VNIIEF, Sarov MSFC/NASA Max-Planck-Institute for Astrophysics, Garching Istitut fur Astronomie und Astrophysik, Univ. Tubingen Astrophysikalishes Institut Potsdam University Erlangen-Nuernberg Hamburg University Max-Planck-Institute for Extraterrestrial Physics, Garching DLR 2

3 Composition of the head module erosita ART-XC Navigator Fregat-SB Buster 3

4 26 March, 2016 L2 Parking orbit Injection into parking orbit with Zenit LV ΔV2 ΔV1 Fregat 2 nd burn Fregat 1 st burn 4

5 Observational strategy: 1. Three months flight to L2, verification and calibration of payload 2. 4 years all sky survey 3. 3 years on follow-up pointed observations of a selection of the most interesting galaxy clusters and AGNs. 5

6 Halo-orbit parameters: Transfer to L2 point vicinity days min/max X ( 1000 km): 100 / 300 min/max Y ( 1000 km): 900 / 900 min/max Z ( 1000 km): 200 / 150 6

7 Ground control stations 7

8 Radio-visibility 8

9 The S/C rotation axis is always pointed between the Sun and the Earth to ensure that the Earth is always within the beam pattern of the S/C medium gain antenna. Movement of the S/C around the L2 point combined with the movement of the Earth around the Sun leads to no uniform sky coverage. 9

10 10

11 ART-XC 1. Energy range 5 30 kev 2. FOV On-axis resolution 1 4. Total weight 350 kg 5. Power consumption 300 W 11

12 ART-XC 12

13 ART-XC programs: STM QM of carbon fiber structure, materials, coating, thermal balance system, MLI, harness mechanical and TV tests; EM FM design except for mirror systems (7 mass dummy) and detectors (2 EM DSSD CdTe detectors & 5 electrical imitators) electrical tests, aboard S/W debugging; QM FM design except for mirror systems (VNIIEF design, cone-cone approximation) mechanical, climatic, TV, EMC, electrostatic discharge and life time tests; FM FM design; SM 1 mirror system (MSFC) and 3 detectors (IKI) 13

14 ART-XC 1) VNIIEF, Sarov design of telescope, QM X-ray mirror systems, structure, tests, AIT 2) IKI, Moscow CdTe DSSD X-ray detectors, aboard computer and memory, thermal balance system control block, star sensor, X-ray ground calibration of detectors and mirror systems 3) MSFC/NASA FM X-ray mirror systems and their ground calibration 4) Lavochkin Association, Khimki MLI, heat pipes, pyropin 5) Obninsk Research and Production Enterprise "Technologiya carbon fiber structure 14

15 ART-XC: STM model 15

16 ART-XC: EM model 16

17 17

18 FOV: ART-XC vs NuSTAR mm = 36.3 NuSTAR = mm 18

19 ART-XC vs NuSTAR Source effective area 1:2 Background N MS (HPD*F L ) 2 1:10 19

20 Simulated effective area for one mirror module D 8 kev P H S D rays doubly reflected from the P and H mirrors; P singly reflected from the parabolic mirrors, H singly reflected from the hyperbolic mirrors, S unreflected rays passing straight-through the mirror module. 20

21 ART-XC: AGN ART-XC All-sky Polar Point Survey [deg 2 ] Average sensitivity [2-10 kev, erg cm -2 s -1 ] Expected number 41, , ,000 21

22 ART-XC: X-ray mirror systems MSFC/NASA 22

23 ART-XC: X-ray mirror systems MSFC/NASA 1. Number of mirror systems 7 2. Number of nested mirror shells Form of shell Wolter-I 4. FOV with detector mm On-axis angular resolution, HPD Focal length 2700 mm 7. Length of shell 580 mm 8. Diameter of mirror shells mm 9. Material of shells Ni/Co 10. Mirror coating materials Iridium 23

24 FM MSFC/NASA mirror system at IKI 24

25 FM MSFC/NASA mirror system backside 25

26 Results of ground calibration of 7 FM + SM mirror systems Total on axis effective area 470 cm 2 at 8 kev Module # HPD, arcsec 29,7 32,2 43,0 34,3 on axis Eff. Area, cm 2 at 8 kev 71,0 69,0 66,0 67,0 Module # SM 8 HPD, arcsec on axis Eff. Area, cm 2 at 7-9 kev 67,0 65,2 64,0 66,6 26

27 Half Energy Width (arcsec) FM #1 tests 200 Minus 15 mm Minus 7 mm Nominal Focus Off Axis Angle (arcmin) Average of (0, 45, 90, 135) scans for nominal focus (blue), 7 mm (brown), 15 mm (green) True-to-scale images at 7 mm from focus, as a function of off-axis angle in arcmin 27

28 Percentage of counts FM #1, on-axis PSF size arcmin - Percentage of counts vs Pinhole diameter 4 to 5 5 to 6 6 to 7 7 to 8 8 to 9 9 to to to to to to to to 30 HPD 30 W Diameter (arcsec) 28

29 ART-XC: DSSD CdTe detector 1. CdTe manufacturer ACRORAD 2. Dimensions mm 3 3. Working area mm 2 4. Energy range kev 5. Number of strips Strip pitch mm (45 ) 7. Be entrance window 30 mm 100 m 8. ASIC VA64TA1 9. Dead time 1 ms 10. Working temperature 30 C 11. Energy resolution 14 kev 29

30 ART-XC: QM DSSD CdTe crystals and their holders 30

31 ART-XC: QM detector system assembling 31

32 ART-XC: QM, technological run at room temperature 32

33 ART-XC: QM some test images mm = mm Left panel the image at 55 Fe line 5.9 kev; Center panel the total image of 237 Np lines: 13.9, 17.8, 20.8 kev and 241 Am line 26.3 kev Right panel the image at 241 Am line 59.6 kev. The dark areas are a shadow from the cover with Be entrance window 30mm 100 m. The detector cover is transparent for the photons at energies 50 kev. 33

34 ART-XC: energy spectrum 34

35 ART-XC: energy spectrum 35

36 boundary effect B1T1 B1T2 dislocations B2T1 B2T2 36

37 Images of 7 holes with 0.5 mm at energy 5.9 kev 37

38 Thank you 38