Shu Zhang(on behalf of the HXMT team)

Institute of High Energy Physics, Chinese Academy of Science

The current status of HXMT and its calibrations

News of the mission & Progress of

payload

Calibrations in Panter

Calibration facilities

Outline

Satellite Facts:Weight: ~2800 kgOrbit: 550 km, 43°Attitude: 3-Axis Stabilized precision 0.1 °Lifetime: 4 yearsObservation modes: Scan and pointing

HXMT collaborationInstitute of High Energy Physics (PI institute, payloads, scientific operation)Chinese Academy of Space Technology (satellite platform)National Space Science Center, CAS (space environment monitor, mission operation)Tsinghua University (participation in payloads and scientific operation)

HE: NaI/CsI, 20-250 keV, 5000 cm2

Size ： 1900×1650×1000 mm

ME:Si-PIN

,5-30 keV, 952 cm2

LE:SCD,1-15 keV, 384 cm

2

Star tracker

12/2012

12/2013 2015

We are here .

News of the mission & progress of payload

Launch date: end of 2015

The mechanical model of the satellite in dynamical environment tests

The electric model of HXMT’s payloads in testing.

The payloads before the vacuum thermal balance tests

Progress of the payload

6/23

The electric fitting of the qualification model.

Progress of payload

2013 July 29- August 21,

ME&LE : Energy response, QE and their T

dependences

LE: PSF measurement, QE, linearity

Panter calibration

We calibrated the energy linearity, energy resolution, quantum efficiency of one Si-PIN detector in PANTER X-Ray Test-Facility from July 29 to August 21, 2013.

• Monochromatic spectra of ME detector at -17 .℃

• The peaks of the spectra varied with different temperature.

• Left is the energy linearity of ME detector at -6 .℃• Right is the slope of energy linearity in different temperature.

The energy resolutions varied with different temperature.

Quantum efficiency of ME detector at different temperature

Facility for HE We have successfully finished (in 2013) a calibration facility for HE togather with China National Institute of Metrology. (10-150 keV）

X-ray machine

Double crystal monochromator

Background shielding box for the calibrated detector

Monoenergy peaks

Mono-energy fraction >90%

Monochromaticity <1%

Instrument Calibration We are building on IHEP campus the calibration facility for ME and LE. It will be finished in middle 2014. （ 1-30 keV）

Vacuum charmber

X tube DCM Vacuum tube

See details of calibration issues in the later talk, which will be handled in SGS the background, the calibration dataset and software.

Thank you for your attention!

4. Summary

Backup materials

Detectors LE: SCD, 384 cm2;ME : Si-PIN, 950 cm2

HE : NaI/CsI, 5000 cm2

Energy Range LE: 1-15 keV;ME: 5-30 keV;HE: 20-250 keV

Time Resolution HE: 25μs; ME: 180μs;LE: 1ms

Working Temperature

HE: 18±1 ; ME: -50~-20 ; LE: -80-45℃ ℃ ℃

Energy Resolution LE: 2.5% @ 6 keV ME: 14% @ 17.8 keV HE: 19% @ 60 keV

Field of View of one module

LE: 6°×1.6°; 6°×4°; 60°×3°; blind;ME: 4°×1°; 4°×4°; blind;HE: 5.7°×1.1°; 5.7°×5.7° ； blind

Source Location <1' (20σ source)

Characteristics of the HXMT Mission

prototype for observation program draw up HXMT mission movement trajectory Observation visibility study

Monitoring of payload working status

The detailed design of the scientific ground segments and the software requirements have been finished. We are writing the codes of the softwares, which will be finished in the first season of the next year.

Observation Schedule

3. Project status and schedule

Orbit Altitude: ~550 km ; Inclination: ~43°

Attitude Three-axis stabilizedControl precision: ±0.1°Measurement accuracy: ±0.01°

Data Rate LE: 3 Mbps; ME: 3 Mbps; HE: 300 kbps

Payload Mass ~1000 kg

Nominal Lifetime 4 years

Working Mode Scan survey, small region scan, pointed observation

Total background of HE varying with time

Different background components of HE

Background components of ME Background components of LE

Simulation of the in-orbit background of HXMT

Test the performance of the automatic gain control by changing the angle between the main detector and the geomagnetic field.

With out the gain control ， the amplitude variation of the same energy incident photons can reach 10.6% ， and it decreased to 0.243% using the AGC, the effect on the energy resolution is as small as 1.31%。

Automatic Gain Control

The sensitivities of the three telescopes of HXMT. The sensitivities of NuSTAR, INTEGRAL/IBIS and RXTE/HEXTE were reprinted from Koglin et al. (2005)3.

2. Introduction to the payloads

HXMT/LE

HXMT/ME

HXMT/HENuSTAR

INTEGRAL/IBIS

RXTE/HEXTE

25

2. Introduction to the payloads

HXMT RXTE INTEGRAL/IBIS SWIFT NuSTAR

Energy Band (keV)

LE: 0.8-15ME: 5-30HE: 15-250

PCA: 2-60HEXTE: 15-250

15-10000 XRT: 0.5-10BAT: 10-150

3-79

Detection Area (cm2)

LE: 384ME: 950HE: 5000

PCA: 6000 HEXTE: 1600

2600 XRT: 110BAT: 5200

847 @ 9 keV60 @ 78 keV

Energy Resolution (eV)

150@ 6 keV2500@ 20 keV10000@60 keV

1200@6keV10000@60 keV

8000@ 100 keV

150 @ 6 keV3300 @ 60 keV

900 @ 60 keV

Time Resolution (ms)

LE: 1ME: 0.18HE: 0.012

PCA: 0.001HEXTE: 0.006

0.06 XRT: 0.14, 2.2,2500 BAT: 0.1

0.1

Sensitivity (@100keV, 3σ ，105s, mCrab)

0.5 1.5 3.8 9 0.03 @ 20 keV

Comparison between HXMT and other major hard X-ray telescopes