ACIS FOCAL PLANE COOLING TESTS

Introduction

This webpage is a summary of ACIS focal plane cooling tests that are regularly executed whenever the HRC instrument is conducting a long observation of more than 50 ks. During such tests, the focal plane temperature is set to -130 to investigate the current margin against maintaining a cold focal plane.

Results

DATE PLOT Duration (ks) Pitch (deg) EarthRad Min Temp (C)
1999:354 ps|pdf 54 90 Yes -123.09
1999:363 ps|pdf 24 165 Yes -116.37
2003:130 ps|pdf 54.6 136 Yes -121.64
2003:133 ps|pdf 19.4 136 Yes -121.96
2004:201 ps|pdf 20.0 72 Yes -121.58
2004:349 ps|pdf 43.0 136 Yes -119.98
2005:024 ps|pdf 68.0 127 Yes -120.53
2005:070 ps|pdf 44.5 84 Yes -121.86
2005:105 ps|pdf 144.0 72 Yes -120.32
2005:139 ps|pdf 111.3 68 No -122.52
2005:353 ps|pdf 168.5 68/150 (var) Yes -122.12
2005:355 ps|pdf 49.8 68 Yes -121.97
2005:356 ps|pdf 51.4 68 Yes -120.84
2006:002 ps|pdf 99.8 66 Yes -121.64
2006:033 ps|pdf 111.0 139 Yes -120.32
2006:189 ps|pdf 141.0 55 Yes -122.45
2006:236 ps|pdf 150.0 47 Yes -122.59
2007:009 ps|pdf 60.8 127 Yes -120.48
2007:012 ps|pdf 20.0 126 Yes -120.31
2007:155 ps|pdf 117.0 135 Yes -120.39
2007:183 ps|pdf 77.5 140 Yes -120.02
2007:226 ps|pdf 97.5 65 Some -122.47
2007:267 ps|pdf 100.36 65 No -122.50
2008:017 ps|pdf 44.7 140 No -120.02
2008:022 ps|pdf 96.49 140 No -119.90

2008:112 ps|pdf 51.67 49 No -125.28*
2008:123 ps|pdf 53.20 145 Yes -122.61*

Data after this point use solid angle of Earth on cold radiator

2008:261 ps|pdf 80.89 151 No -123.50*
2008:263 ps|pdf 52.21 150 No -123.78*
2008:266 ps|pdf 76.03 149 No -123.73*
2008:273 ps|pdf 57.49 146 No -122.44*
2008:281 ps|pdf 92.25 151 Some -121.96*
2008:284 ps|pdf 98.72 138 No -123.59*
2009:079 ps|pdf 130.18 59 No -125.338*
2009:085 ps|pdf 124.98 59 No -125.338*
2010:222 ps|pdf 75.5 59 Yes -125.190*
2010:313 ps|pdf 75.5 151 Partial -123.190*
2010:363 ps|pdf 92.5 137 Yes -122.72*
2011:024 ps|pdf 80 150 No -121.32*
2011:061 ps|pdf 88 150 No -121.93*
2011:064 ps|pdf 71 152 No -123.57*
2011:124 ps|pdf 167 147 Yes -122.76*
2011:126 ps|pdf 176 148 Yes -121.45*
2011:169 ps|pdf 155 136 No -120.84*

2012:044 ps|pdf 189.3 53 No -125.28*

2013:190 ps|pdf 89.8 68.4 Partial -125.28*

2013:208 ps|pdf 98.6 81.3 Partial -125.28*

2014:096 ps|pdf 79.5 80.1 Partial -125.28*

2014:192 ps|pdf 59.4 127.7 No -124.5*

2014:194 ps|pdf 49.5 126.5 No -120.4*

2014:242 ps|pdf 23.46 92.6 No -122.6*

2014:259 ps|pdf 61.0 128.2 Partial -121.2*+

2017:017 ps|pdf 56.4 77.13 Partial -124.5*

2018:249 ps|pdf 40.0 63 No -123.8*

2020:048 png|pdf 58.0 54 Some -125.0*

2020:088 png|pdf 44.8 88 Some -122.6*

2021:240 png|pdf 41.3 60 Some -124.2*

* Focal Plane Temperature setpoint = -126 C [WSFTNEG126]
+ Detector Assembly Housing Heater on

DATE	PLOT	Duration (ks)	Pitch (deg)	EarthRad	Min Temp (C)
1999:354	ps\|pdf	54	90	Yes	-123.09
1999:363	ps\|pdf	24	165	Yes	-116.37
2003:130	ps\|pdf	54.6	136	Yes	-121.64
2003:133	ps\|pdf	19.4	136	Yes	-121.96
2004:201	ps\|pdf	20.0	72	Yes	-121.58
2004:349	ps\|pdf	43.0	136	Yes	-119.98
2005:024	ps\|pdf	68.0	127	Yes	-120.53
2005:070	ps\|pdf	44.5	84	Yes	-121.86
2005:105	ps\|pdf	144.0	72	Yes	-120.32
2005:139	ps\|pdf	111.3	68	No	-122.52
2005:353	ps\|pdf	168.5	68/150 (var)	Yes	-122.12
2005:355	ps\|pdf	49.8	68	Yes	-121.97
2005:356	ps\|pdf	51.4	68	Yes	-120.84
2006:002	ps\|pdf	99.8	66	Yes	-121.64
2006:033	ps\|pdf	111.0	139	Yes	-120.32
2006:189	ps\|pdf	141.0	55	Yes	-122.45
2006:236	ps\|pdf	150.0	47	Yes	-122.59
2007:009	ps\|pdf	60.8	127	Yes	-120.48
2007:012	ps\|pdf	20.0	126	Yes	-120.31
2007:155	ps\|pdf	117.0	135	Yes	-120.39
2007:183	ps\|pdf	77.5	140	Yes	-120.02
2007:226	ps\|pdf	97.5	65	Some	-122.47
2007:267	ps\|pdf	100.36	65	No	-122.50
2008:017	ps\|pdf	44.7	140	No	-120.02
2008:022	ps\|pdf	96.49	140	No	-119.90
2008:112	ps\|pdf	51.67	49	No	-125.28*
2008:123	ps\|pdf	53.20	145	Yes	-122.61*
Data after this point use solid angle of Earth on cold radiator
2008:261	ps\|pdf	80.89	151	No	-123.50*
2008:263	ps\|pdf	52.21	150	No	-123.78*
2008:266	ps\|pdf	76.03	149	No	-123.73*
2008:273	ps\|pdf	57.49	146	No	-122.44*
2008:281	ps\|pdf	92.25	151	Some	-121.96*
2008:284	ps\|pdf	98.72	138	No	-123.59*
2009:079	ps\|pdf	130.18	59	No	-125.338*
2009:085	ps\|pdf	124.98	59	No	-125.338*
2010:222	ps\|pdf	75.5	59	Yes	-125.190*
2010:313	ps\|pdf	75.5	151	Partial	-123.190*
2010:363	ps\|pdf	92.5	137	Yes	-122.72*
2011:024	ps\|pdf	80	150	No	-121.32*
2011:061	ps\|pdf	88	150	No	-121.93*
2011:064	ps\|pdf	71	152	No	-123.57*
2011:124	ps\|pdf	167	147	Yes	-122.76*
2011:126	ps\|pdf	176	148	Yes	-121.45*
2011:169	ps\|pdf	155	136	No	-120.84*
2012:044	ps\|pdf	189.3	53	No	-125.28*
2013:190	ps\|pdf	89.8	68.4	Partial	-125.28*
2013:208	ps\|pdf	98.6	81.3	Partial	-125.28*
2014:096	ps\|pdf	79.5	80.1	Partial	-125.28*
2014:192	ps\|pdf	59.4	127.7	No	-124.5*
2014:194	ps\|pdf	49.5	126.5	No	-120.4*
2014:242	ps\|pdf	23.46	92.6	No	-122.6*
2014:259	ps\|pdf	61.0	128.2	Partial	-121.2*+
2017:017	ps\|pdf	56.4	77.13	Partial	-124.5*
2018:249	ps\|pdf	40.0	63	No	-123.8*
2020:048	png\|pdf	58.0	54	Some	-125.0*
2020:088	png\|pdf	44.8	88	Some	-122.6*
2021:240	png\|pdf	41.3	60	Some	-124.2*