2007/12/08-10 Hinode Workshop in China 1

XRT On-orbit Performance

R. Kano (NAOJ)& Japan-US XRT Team

Hinode Workshop in China 22007/12/08-10

Contents

Optical Performance (Telescope Temperature) Mechanics CCD Performance Effect of Radiation Environment Unexpected Things

The temperature in the front part of XRT. The motion of one of the filter wheel (FW1). The change of the XRT response.

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Optical Performance: PSF

From the observation of a Mercury transit, FWHM = 1.0 ± 0.12 arcsec(Weber et al. 2007, PASJ).

This is statistically consistent with the pre-launch measurement.FWHM 〜 0.8 arcsec.

Mercury

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Optical Performance: Scattered Lights

“Al/Mesh”“Ti/Poly”

Non-occulted data

Occulted data

Eclipse observations suggest the scattered lights, which have not yet parameterized.

For the analysis of faint objects, especially in a coronal hole and above the limb, we have to pay a great attention to the scattered lights.

Kano et al. 2008

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Mechanism

XRT has 2 filter wheels, 2 shutters, and 1 focusing motor.

Except for 1 filter wheel (FW1), all mechanism works well.

Latter I will talk about FW1.

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XRT Camera Temperature

カメラエレキ (XRT-E) 温度

(CCD 冷却用 ) 放熱板温度

CCD 温度

カメラ ON OPヒーター ON　　　　 (2007/06/18)

CCDヒーター OFF

CCD が軌道上で最も高温となるケース（ベークアウト時を除く）

Goal ： -43℃

CCDベークアウト

( カメラ搭載 ) プリアンプ温度　 (11 月以降のスパイクは技術試験による影響で既知の事象 )

( 水色 ) ヒーター制御用の CCD 温度センサー (-60℃ では誤差大 )

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Dark Current

•黒い実線が打上げ前データ。•青プロットが軌道上の通常観測時。•赤プロットは軌道上での Bake-out の際に 測定したもの。

（緑線は 64sec で 1DN となるレート）

図 : 暗電流値の軌道上および地上試験での測定結果

軌道上高温ケース

通常の露光時間（～ 10sec 以下）では無視できるほど小さい！

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solar disk

2007/02/09 20:32:32

(b)

Insi

de

of S

AA

solar disk

2007/02/09 21:12:44

(a)

Ou

t of S

AA

Pseudo signalsby high-energy-particle events.

DC-offset levelfor 8”x8” images

Effects of High Energy Particles

Histogram of XRT counts

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SAAでは CCD 画質が悪化HLZではそれほどでもない

< 10 pixel 　　　　　 = < 0.04%

10 ～ 30 pixel = 0.04 ～ 0.12%

30 ～ 100 pixel = 0.12 ～ 0.41%

100 ～ 300 pixel = 0.41 ～ 1.22%

300 ～ 1000 pixel = 1.22 ～ 4.07%

1000 ～ 3000 pixel = 4.07 ～ 12.2%

> 3000 pixel = > 12.2%

SAA

HLZ

HLZ

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Temperature Diagnostics

Narukage et al. 2007

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Unexpected Things

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There are some unexpected things.

The temperature in the front part of XRT. Higher than our expectation, but no serious problem

for XRT operations and observations. FW1 accidentally stopped in November, 2006.

But it returned to normal operations since May 10th, 2007.

The change of the XRT response. We have the data to calibrate the XRT response. XRT team will deriver the database of the XRT

response through SSWDB in near future.