XIS2 Calibration Status at Osaka U.

2004/03/16

• Overview and current status of calibration in the soft X-ray region

• Energy-Pulse Height relation• Energy-Resolution relation• Quantum Efficiency• Line Profile

K. Torii (Osaka U.), XIS2 team

Calibration method at Osaka U.

• We use a (calibrated) proportional counter as an absolute reference counter

• Calibrate XIS-EU (Seg. C) against the reference proportional counter

• Calibrate XIS-FM against XIS-EU (Seg. C)

Proportional counter

XIS-EU (Seg. C)

XIS-FM

Calibration of EU

PD PCXIS-EU

Dispersed X-ray from spectrometer

Calibration of FM

PD Fe55XIS-FM

Dispersed X-ray from spectrometer

The datasets (2003/12-2004/3)

• EU : 8s × 14000 fr. (2003/12/12-30, 2004/2/17-19)• FM S0: 8s × 5262 fr. (2004/2/26-27, 2004/3/8-10)• FM S1: 8s × 9225 fr. (2004/3/3-6)• FM S2: 8s × 11930 fr. (2004/1/6-14, 2/7-11)• FM S3: 8s × 12810 fr. (2004/1/26-2/6)• FM S1, S2, S3 are complete, some additional data have t

o be taken for S0 and EU • EU:125-126eV, FMS2:127-129eV, FMS3:128-130eV• EU:2.1-2.4e-, FMS2:1.9-2.5e-, FMS3:2.2-2.5e- (Normal, grade 0)

• PH=a ・ E + b• 1/a=3.720 eV/ch• b=1.38 ch

Energy-PH relation (FM S2, Segment C)

Si-K edge

• Qualitatively similar results are obtained for all the sensors.

S0, Seg.A, Grade0 S1, Seg.C, Grade0

Energy-PH relation (S0-A, S1-C)

Energy-PH Relation (FM S3-A)

• Fe55 で決めたゲインと～ 0.1% で一致• Qualitatively similar results are obtained for

grade 0 and 02346.

Energy-Resolution (FM S2, Segment C)

• FWHM = sqrt (f02 + wf ・ E)

• f0 　 =15.2eV, ｗｆ＝ 0.45

Si-K edge

Energy-Resolution (FM S3, Segment A)

• Qualitatively similar results are obtained for all the sensors.

Q.E.: Input flux is variable …

+15%

C-K

O-K

Se-L (1.38 keV)W-M (1.77 keV)

Si　 edge

Al　edge

Au　edge

Ratio of 2004/2003 EU data

Se L-α(1.38 keV)

W-M (1.77 keV)

The dispersed spectra for Seg. C, Grade 02346

Se-L

C-K O-K

EU1

S3(×4)

S2(×16)

S1(×256)S0(×1024)

EU2(×64)

Uncorrected relative Q.E. (Seg. C, Grade 02346)

S3S2EU2S1S0

EXAFS and XANES at Oxygen K edge• FMS2, Segment 2, Grade 02346

EXAFS, XANES

Carbon K

Oxygen K

Line profile (low energy tail) Oxygen-K (0.525 keV), H.V. = 1 and 5kV

• The effect of applied high voltage (5 kV) is almost negligible.• Tail component is significantly smaller than that for XIS 1.

1 kV5 kV

Pulse Height

Counts

XIS1 (H.Katayama master thesis)

XIS2-S2

Summary• Cal. Data were obtained with Fe55 and spectrom

eter (~0.2-3 keV).• E-PH, E-Resolution relations are as expected.• Low energy tail component is smaller than that f

or XIS1 sensors.• We find that X-ray flux from the generator is var

iable on long timescale. This has to be taken into account before calculating QE.

• BPSG layer thickness does not seem to be significantly thinner for FM sensors than for EU (preliminary).

Line profile (low energy tail)

Pulse Height

• Tail component is significantly smaller than that for XIS 1.

Counts

Dispersed spectra (Q.E.)

EU(1)

EU(2)

S0

S1

S2

S3

Energy [keV]