X-ray Timing and Polarizationmission & instrumentation

DONG Yongwei

Center for Particle Astrophysics

Institute of High Energy Physics, Chinese Academy of Sciences

XTP Scientific objectives

Scientific Problems One Singularity (BH), Two Stars (NS and magnetar), Three Extremes (gravity, density, magnetism)

The effective area of focusing telescope has been confirmed to be the breakthrough capability of the merged mission.

The unique polarization measurement capability has been selected as the distinguishing feature. XTP will open a new window using its powerful capability of polarization observation.

XTP payload configuration

3

FL: 4.5m, FoV 16’,0.5~15keV5000cm2@2~6keV

FL: 5.5m, FoV 16’,1~30keV4000cm2@2~6keV, 300cm2@30keV

1°×1°,8-100 keV2500 cm2

Summary of focal payload

  HFA LFA

Optics MirrorQuasi-Wolter I, nested,Multi-layerShell substrate ： Al foil or slumped glass

Quasi-Wolter I, nestedShell substrate ： Al foil or slumped glass

Focal length 5.5m 4.5mFOV 16’ 16’HPD 2’ 2’Energy range

1~30keV 0.5~15keV

Effective Area

4000cm2@2~6keV300cm2@30keV

5000cm2@2~6keV

Units5(3GEM-TPC+CZT,2SDD/DEPFET)

10

Focal plane detector

GEM-TPC(top)+CZT(focal point): CZT(1mm*1mm*1mm) ： 16*16SPD(or DEPFET): 10×10 pixels,1mm×1mm×0.5mm

SDD(or DEPFET): 10×10 pixels1mm×1mm×0.5mm

Energy resolution

CZT ： 600 eV@5.9 keVSDD/DEPFET ： 150eV@5.9keV

SDD/DEPFET ：150eV@5.9keV

Nested quasi-wolter I type Mirror length 100 mm Thickness 0.2 mm F/D ~ 10 Inner: W/Si; outer Ir Slumped Glass/ Al foil

X-ray optics

Focal plane detectors

SDD/SPD, or DePFET(MPE)

7 SDD detectors.FWHM=160eV@5.9keV at room temp.

100-pixel Si-PIN detectors.FWHM=1.1keV@60keV at room temp.

Polarization meas. using GEM-TPC

Cross-section of photoelectric effect

2cosdd

Transmissive design of GEM-TPC

@Tsinghua University

Focal planeFocused beam

High energy X-ray Collimating Array

Sketch map of One HCA moduleCZT detector is applied.

•The collimator is made using Lithographie - Galanoformung - Abformung (LIGA) technique.

•Nickel, hole size 170*170μm, •Grid thickness 30μm, •Height 0.6mm

Wide Field Camera

The WFC is to monitor the transient X-ray sources and to localize them with an accuracy of 5 arcmin.

With the slew of platform, other instruments will be guided to make follow-up observations.

XTP area and background

XTP effective area

Launcher

LM-3C, 2 boosters.

12

LM-3C launch capability

The launch capability of the LM-3C for LEO mission into a 200 km circular orbit with an inclination of 28.5 deg is 9,100 kg.

550km & 28.5 deg ~ 6 t. Altitude easy to be changed. Inclination

angle NOT!

13

LM-3C launch capa. for GTO orbit

XTP orbit

Basic para. Altitude 550 km Inclination angle 28 degree (14 degree as

backup). It depends on the particle background, particle flux, SAA crossing time, earth occulation, ground stations

Miscellaneous

Mass: <3200 kg (satellite); ~1100kg (payload) Power: 1300W (platform); 1000W(payload) Launch time: ~2020 Lifetime: 5 years (expected, 10 years)

XTP has been selected as a background project by the Strategic Pioneer Program (SPP) on Space Science of the Chinese Academy of Sciences.

X band data: rely satellite or international collaboration (if the inclination angle is too small)

Focal plane detectors & collimating detectorsThanks!