XRT Stray Light Study 2024 -- phase 6 and 7 (after 11-May-2024).

Link to the 2014 summary page.
Link to the 2015 phase 1 summary. (after 9-May-2012 ← 1st pre-filter failure event)
Link to the 2015 phase 2 summary. (after 14-Jun-2015 ← 2nd failure event)
Link to the 2016 page and 2017 phase 2 page.
Link to the 2017 phase 3 page (after 27-May-2017 ← 3rd event).
Link to the 2018 phase 4 page (after 29-May-2018 ← 4th event).
Link to the 2019 phase 4 page.
Link to the 2020 phase 4 page.
Link to the 2021 phase 4 page.
Link to the 2022 phase 4 page.
Link to the 2022 phase 5 page (after 8-Jun-2022 ← 5th event).
Link to the 2023 phase 6 page (after 5-May-2023 ← 6th event).

(12 Jun 2024 initial version by Aki Takeda)

1. Purposes of the stray light measurement in 2024.

5/11 between 06:05 and 08:52

2. Summary of Results.

3. Measurements 2024 (phase 6 and 7) at a glance.

ID No. date & time (UT) XOB purposes (link: obtained plots & images) memo
1 4-May-2024, 18:53:30 1D14 light crv., Al-mesh (1.4s) and Al-poly (2.0s) at DC. previous bakeout + 10 day.
2 5-May-2024, 17:49:00 1D15 light crv., thin-Be (11.3s) at DC. prev. b.o. + 11 day.
3 6-May-2024, 18:25:30 1D16 light crv., med-Be (22.6s) at DC. prev. b.o. + 12 day.
4 7-May-2024, 18:57:00 1D14 light crv., Al-mesh (1.4s) and Al-poly (2.0s) on W-limb prev. b.o. + 13 day.
5 8-May-2024, 17:52:30 1D14 light crv., Al-mesh (1.4s) and Al-poly (2.0s) on E-limb. prev. b.o. + 14 days.
6 9-May-2024, 18:26:30 1D14 light crv., Al-mesh (1.4s) and Al-poly (2.0s) on N-pole prev. b.o. + 15 days.
7 10-May-2024, 17:22:00 1D14 light crv., Al-mesh (1.4s) and Al-poly (2.0s) on S-pole prev. b.o. + 16 days.
8 11-May-2024, 17:55:30 1D14 light crv., Al-mesh (1.4s) and Al-poly (2.0s) on (-528.4,-528.4) prev. b.o. + 17 days.
9 15-May-2024, 18:35:00 1D14 light crv., Al-mesh (1.4s) and Al-poly (2.0s) on (528.4,-528.4) prev. b.o. + 0 days.
10 16-May-2024, 19:09:00 1D14 light crv., Al-mesh (1.4s) and Al-poly (2.0s) on (528.4,528.4) prev. b.o. + 1 days.
11 17-May-2024, 18:04:30 1D14 light crv., Al-mesh (1.4s) and Al-poly (2.0s) on (-528.4,528.4) prev. b.o. + 2 days.
12 23-May-2024, 18:10:30 1D14 light crv., Al-mesh (1.4s) and Al-poly (2.0s) at DC prev. b.o. + 8 days.
13 24-May-2024, 18:44:30 1D15 light crv., thin-Be (11.3s) at DC. prev. b.o. + 9 days.

4. Stray light images 2023 (phase 6 and 7), at a glance.

The stray light component included in the Al_mesh filter was increased by the factor of 1.25 compared with the corresponding 2021 July data (phase 5). E-limb images started to show new stray light pattern.

- DC pointings
[NOTE] pnt. indicates the satellite pointing at the time of data acquisition, i.e., (index.xcen, index.ycen) corrected by the the coalignment DB.

Al-mesh, 20240504(1.4s)
phase 6 [pbo+10d]
pnt.(-xx., xx.)
Al-mesh, 20240523(1.4s)
phase 7 [pbo+8d]
pnt.(-xx, xx.)
Al-mesh, 20230506(1.4s)
phase 6 [pbo+10d]
pnt.(-15.9, 17.3)
Al-mesh, 20220709(1.4s)
phase 5 [pbo+3d]
pnt.(-20.5,28.2)
After PREP comparison
with phase 6 & 7
pnt.(-20.5,28.2)

- limb pointings

Al-mesh, 20230509(1.4s)
[pbo+13d]
pnt.(-14.4, 869.1)
Al-mesh, 20230509(1.4s)
[pbo+13d]
pnt.(-986.3 46.7)
Al-mesh, 20230518(1.4s)
[pbo+1d]
pnt.(-35.7, 952.6)
Al-mesh, 20230519(1.4s)
[pbo+2d]
pnt.(-978.4, 3.4)
Al-mesh, 20230519(1.4s)
[pbo+2d]
pnt.(945.0, 46.5)
Al-mesh, 20230518(1.4s)
[pbo+1d]
pnt.( 2.4,-926.2)

- Other pointings

Al-mesh, 20230509(1.4s)
[pbo+13d]
pnt.( 483.7, 7.0)
Al-mesh, 20230510(1.4s)
[pbo+14d]
pnt.( 301.1, 712.8)
Al-mesh, 20230511(1.4s)
[pbo+15d]
pnt.( 231.9, 24.4)
Al-mesh, 20230512(1.4s)
[pbo+16d]
pnt.(-266.8, 17.0)
Al-mesh, 20230513(1.4s)
[pbo+17d]
pnt.(-516.6, 12.7)
Al-mesh, 20230720(1.4s)
[pbo+22d]
pnt.(-540.4,-513.9)
The stray light component included in the Al_poly filter was increased. The the same factor as Al_mesh, 1.1 (compared with 2018) is aplicable to the Al_poly filter. The West pointing anomaly (significant amount of stray light intensity near West-limb pointing) is now the level of ~44 DN/sec/half-res pix).

- DC pointings

Al-poly, 20240504(2.0s)
phase 6 [pbo+10d]
pnt.(xx, xx)
Al-poly, 20240523(2.0s)
phase 7 [pbo+8d]
pnt.(xx, xx)
Al-poly, 20230506(2.0s)
phase 6 [pbo+10d]
pnt.(-15.9, 17.3)
Al-poly, 20220709(2.0s)
phase 5 [pbo+3d]
pnt.(-20.5, 28.2)
After PREP comparison
with phase 6 & 7

- limb pointings

Al-poly, 20230509(2.0s)
[pbo+13d]
pnt.( -14.4, 869.1)
Al-poly, 20230509(2.0s)
[pbo+13d]
pnt.(-986.3, 46.8)
Al-poly, 20230508(2.0s)
[pbo+12d]
pnt.( 935.4, -3.4)
Al-poly, 20230518(2.0s)
[pbo+1d]
pnt.( -35.6, 952.6)
Al-poly, 20230519(2.0s)
[pbo+2d]
pnt.(-978.4, 3.5)
Al-poly, 20230519(2.0s)
[pbo+2d]
pnt.( 944.5, 46.5)
Al-poly, 20230518(2.0s)
[pbo+1d]
pnt.( 2.3, -926.2)

- Other pointings

Al-poly, 20230509(2.0s)
[pbo+13d]
pnt.( 483.7, 7.0)
Al-poly, 20230510(2.0s)
[pbo+14d]
pnt.( 301.1, 712.8)
Al-poly, 20230511(2.0s)
[pbo+15d]
pnt.( 232.0, 24.4)
Al-poly, 20230512(2.0s)
[pbo+16d]
pnt.(-266.8, 17.0)
Al-poly, 20230513(2.0s)
[pbo+17d]
pnt.(-516.6, 12.7)
Al-poly, 20230720(2.0s)
[pbo+22d]
pnt.(-540.4,-513.8)
Stray light level in the thin_Be and Al_poly/Ti_poly images are in negligible level.

thin_Be,20230507
(11.3s), pnt.(-15.9,17.5)
Apol/Tpol,20250507
(4.0s), pnt.(935.6,-3.4)