X-ray Imaging Spectrometer (XIS)
HK Monitoring

CCD Temperature Jumps

I sent a script through all of the hk data that I have (all of which was copied from hikari.astro.isas.jaxa.jp:/usr/local/astroe/data/xis) looking for temperature jumps of more than 4C on either the CCD, S?_TCECCR1_CAL, or base plate, S?_TCECCR2_CAL.

As of July 6, 2010 a total of 152 temperature jumps have been found.

Sensor value total jumps up jumps down jumps

XIS0 CCD 22 15 7 (43112 seconds)

XIS0 baseplate 24 13 11

XIS1 CCD 13 10 3 (18256 seconds)

XIS1 baseplate 26 22 4

XIS2 CCD 5 2 3 (18208 seconds)

XIS2 baseplate 13 6 7

XIS3 CCD 6 6 0

XIS3 baseplate 43 29 14

Note that a CCD sensor jump up results in the CCD going colder and a CCD sensor jump down results in the CCD going warmer. CCD temperature jumps up aren't a big impact because the TECs aren't capable of driving the CCDs much more than a a few degrees colder than the setpoint (-90C). However, the CCDs can get very warm (as high as -50C) when the sensor jumps down. Such a warm temperature will impact the performance of the device.

hk date s_time note

S3_TCECCR2_CAL baseplate 20100723 333225671

S0_TCECCR2_CAL baseplate 20100723 333207349

S3_TCECCR2_CAL baseplate 20100720 332898517

S3_TCECCR2_CAL baseplate 20100625 330741981

S0_TCECCR1_CAL CCD 20100618 330186603 XIS0 actually got warmer (over -68C) for 6048 seconds

S3_TCECCR2_CAL baseplate 20100609 329428421

S1_TCECCR2_CAL baseplate 20100601 328714139

S1_TCECCR2_CAL baseplate 20100523 327899997

S1_TCECCR2_CAL baseplate 20100507 326538042

S3_TCECCR2_CAL baseplate 20100407 323980258

S3_TCECCR2_CAL baseplate 20100405 323813876

S3_TCECCR2_CAL baseplate 20100313 321773690

S0_TCECCR2_CAL baseplate 20100304 321027672

S3_TCECCR2_CAL baseplate 20100225 320417476

S1_TCECCR1_CAL CCD 20100218 319781380 XIS1 actaully got slightly colder

S1_TCECCR2_CAL baseplate 20100202 318413668

S3_TCECCR2_CAL baseplate 20100112 316614089

S0_TCECCR2_CAL baseplate 20091225 315040721

S1_TCECCR2_CAL baseplate 20091205 313340154

S3_TCECCR1_CAL CCD 20091102 310443331 XIS3 actaully got slightly colder

S3_TCECCR2_CAL baseplate 20090922 306522937

S1_TCECCR2_CAL baseplate 20090825 304513015

S3_TCECCR1_CAL CCD 20090814 303519614 XIS3 actaully got slightly colder

S3_TCECCR2_CAL baseplate 20090805 302823770

S3_TCECCR2_CAL baseplate 20090724 301738296

S0_TCECCR2_CAL baseplate 20090705 300086776

S3_TCECCR2_CAL baseplate 20090701 299778238

S0_TCECCR1_CAL CCD 20090518 295950091 XIS0 actually got warmer (nearly -60C) for 6104 seconds

S3_TCECCR2_CAL baseplate 20090508 295123687

S0_TCECCR2_CAL baseplate 20090501 294525755

S0_TCECCR2_CAL baseplate 20090429 294353247

S1_TCECCR2_CAL baseplate 20090419 293416256

S3_TCECCR2_CAL baseplate 20090414 293008914

S0_TCECCR1_CAL CCD 20090413 292916790 XIS0 actually got slightly colder

S1_TCECCR2_CAL baseplate 20090409 292571528

S3_TCECCR2_CAL baseplate 20090406 292342594

S3_TCECCR2_CAL baseplate 20090323 291110678

S3_TCECCR2_CAL baseplate 20090318 290697578

S3_TCECCR2_CAL baseplate 20090317 290629588

S0_TCECCR1_CAL CCD 20090218 288237707 XIS0 actually got slightly colder

S1_TCECCR2_CAL baseplate 20090128 286480351

S1_TCECCR2_CAL baseplate 20090120 285733937

S0_TCECCR2_CAL baseplate 20090113 285198197

S1_TCECCR2_CAL baseplate 20081231 284082433

S1_TCECCR2_CAL baseplate 20081224 283428748

S0_TCECCR1_CAL CCD 20081206 281905846 XIS0 actually got slightly colder

S0_TCECCR1_CAL CCD 20081027 278416402 XIS0 actually got slightly colder

S3_TCECCR2_CAL baseplate 20081024 278182008

S0_TCECCR2_CAL baseplate 20081024 278156000

S3_TCECCR2_CAL baseplate 20080926 275733992

S0_TCECCR2_CAL baseplate 20080925 275665086

S3_TCECCR1_CAL CCD 20080918 275067712 XIS3 actually got slightly colder

S0_TCECCR1_CAL CCD 20080910 274347247 XIS0 actually got slightly colder

S0_TCECCR1_CAL CCD 20080801 270882239 XIS0 actually got slightly colder

S0_TCECCR2_CAL baseplate 20080625 267743925

S1_TCECCR2_CAL baseplate 20080618 267084119

S3_TCECCR2_CAL baseplate 20080524 264950958

S0_TCECCR1_CAL CCD 20080421 262101914 XIS0 actually got slightly colder

S1_TCECCR2_CAL baseplate 20080408 260980160

S3_TCECCR2_CAL baseplate 20080403 260548540

S3_TCECCR2_CAL baseplate 20080324 259709976

S1_TCECCR2_CAL baseplate 20080223 257089319

S3_TCECCR2_CAL baseplate 20080125 254578699

S3_TCECCR2_CAL baseplate 20080121 254221961

S1_TCECCR2_CAL baseplate 20080119 254049373

S1_TCECCR2_CAL baseplate 20080101 252544217

S3_TCECCR2_CAL baseplate 20071231 252452097

S1_TCECCR1_CAL CCD 20071223 251693549 XIS1 actually went warmer for 5808 seconds

S0_TCECCR1_CAL CCD 20071219 251422777 XIS0 actually got slightly colder

S3_TCECCR2_CAL baseplate 20071217 251244043

S3_TCECCR2_CAL baseplate 20071203 249973701

S0_TCECCR1_CAL CCD 20071105 247611988 XIS0 actually went warmer for 6176 seconds

S1_TCECCR2_CAL baseplate 20071102 247334724

S1_TCECCR1_CAL CCD 20071029 246957358 XIS1 actually went slightly colder

S0_TCECCR1_CAL CCD 20071008 245157822 XIS0 actually went slightly colder

S3_TCECCR2_CAL baseplate 20070921 243702676

S3_TCECCR2_CAL baseplate 20070918 243455932

S0_TCECCR2_CAL baseplate 20070910 242771524

S3_TCECCR2_CAL baseplate 20070909 242617152

S1_TCECCR1_CAL CCD 20070817 240692166 XIS1 actually went slightly colder

S0_TCECCR2_CAL baseplate 20070810 240064436

S3_TCECCR2_CAL baseplate 20070803 239490660 my script didn't find this one, it was reported by Hironori Matsumoto

S1_TCECCR1_CAL CCD 20070720 238214379 XIS1 actually went slightly colder

S0_TCECCR2_CAL baseplate 20070719 238134051

S0_TCECCR1_CAL CCD 20070622 235821891 XIS0 actually went warmer for 6320 seconds

S0_TCECCR2_CAL baseplate 20070609 234736407

S1_TCECCR2_CAL baseplate 20070601 234052003

S1_TCECCR2_CAL baseplate 20070531 233965719

S0_TCECCR2_CAL baseplate 20070501 231368869

S3_TCECCR2_CAL baseplate 20070420 230395212

S0_TCECCR2_CAL baseplate 20070419 230265180

S3_TCECCR1_CAL CCD 20070408 229383806 XIS3 actually went slightly colder

S0_TCECCR1_CAL CCD 20070408 229327926 XIS0 actually went warmer for 6160 seconds

S1_TCECCR2_CAL baseplate 20070401 228729974

S3_TCECCR2_CAL baseplate 20070324 228057630

S3_TCECCR2_CAL baseplate 20070324 228033324

S3_TCECCR2_CAL baseplate 20070312 227052070

S3_TCECCR1_CAL CCD 20070305 226379438 XIS3 actually went slightly colder

S1_TCECCR1_CAL CCD 20070301 226078380 XIS1 actually went warmer for 6280 seconds

S3_TCECCR2_CAL baseplate 20070212 224573404

S3_TCECCR2_CAL baseplate 20070208 224234236

S1_TCECCR2_CAL baseplate 20070115 222217309

S1_TCECCR1_CAL CCD 20070110 221767545 XIS1 actually went slightly colder

S0_TCECCR1_CAL CCD 20061205 218646711 XIS0 actually went warmer for 6176 seconds

S0_TCECCR1_CAL CCD 20061120 217357841 XIS0 actually went slightly colder

S1_TCECCR1_CAL CCD 20061109 216352425 XIS1 actually went warmer for 6240 seconds

S0_TCECCR1_CAL CCD 20061108 216266147 XIS0 actually went slightly colder

S2_TCECCR1_CAL CCD 20061027 215254635 XIS2 actually went warmer for 6288 seconds

S2_TCECCR2_CAL baseplate 20061013 214070401

S1_TCECCR2_CAL baseplate 20061012 214008219

S0_TCECCR1_CAL CCD 20060921 212139567 XIS0 actually went slightly colder

S3_TCECCR2_CAL baseplate 20060821 209493992

S0_TCECCR2_CAL baseplate 20060819 209345540

S2_TCECCR2_CAL baseplate 20060819 209315220

S2_TCECCR2_CAL baseplate 20060730 207550986

S2_TCECCR2_CAL baseplate 20060726 207211798

S3_TCECCR2_CAL baseplate 20060725 207149654

S2_TCECCR1_CAL CCD 20060723 206971046 XIS2 actually went slightly colder
S0_TCECCR2_CAL baseplate 20060701 205096236

S2_TCECCR1_CAL CCD 20060629 204872858 XIS2 actually went slightly colder

S3_TCECCR1_CAL CCD 20060616 203739317 XIS3 actually went slightly colder

S0_TCECCR2_CAL baseplate 20060611 203305616 my script didn't find this one, it was reported by Hironori Matsumoto

S2_TCECCR1_CAL CCD 20060607 202974411 XIS2 actually went warmer for 6208 seconds

S2_TCECCR2_CAL baseplate 20060528 202141593

S0_TCECCR2_CAL baseplate 20060520 201444803

S1_TCECCR2_CAL baseplate 20060515 201049497

S3_TCECCR2_CAL baseplate 20060511 200692151

S1_TCECCR1_CAL CCD 20060511 200686113 XIS1 actually went colder

S0_TCECCR1_CAL CCD 20060511 200679985 XIS0 actually went colder

S2_TCECCR1_CAL CCD 20060420 198859161 XIS2 was actually warm (probably between -85C and -80C) for 5712 seconds

S2_TCECCR2_CAL baseplate 20060418 198668871

S0_TCECCR2_CAL baseplate 20060403 197385983

S1_TCECCR1_CAL CCD 20060310 195282340 XIS1 actually went colder

S1_TCECCR1_CAL CCD 20060217 193499686 XIS1 actually went colder

S0_TCECCR2_CAL baseplate 20060106 189835405

S1_TCECCR1_CAL CCD 20060105 189755219 XIS1 actually went colder

S2_TCECCR2_CAL baseplate 20051230 189267778

S2_TCECCR2_CAL baseplate 20051210 187380188

S0_TCECCR2_CAL baseplate 20051208 187380188

S2_TCECCR2_CAL baseplate 20051202 186824450

S1_TCECCR1_CAL CCD 20051127 186368526 XIS1 actually went colder

S0_TCECCR1_CAL CCD 20051122 185985102 XIS0 actually went colder

S2_TCECCR2_CAL baseplate 20051120 185812540

S2_TCECCR2_CAL baseplate 20051119 185714310

S3_TCECCR2_CAL baseplate 20051112 185103761

S3_TCECCR2_CAL baseplate 20051110 184943713

S0_TCECCR1_CAL CCD 20051004 181729315 XIS0 actually went warmer for 6128 seconds

S1_TCECCR2_CAL baseplate 20050928 181205393

S0_TCECCR2_CAL baseplate 20050905 179199339

S0_TCECCR1_CAL CCD 20050904 179107519 XIS0 actually went colder

S2_TCECCR2_CAL baseplate 20050813 177261498

S2_TCECCR2_CAL baseplate 20050804 176502410

Each of the figures below contains a plot of the suspect value, the deltaT (between the base plate and the CCD), and the TEC voltage over the interesting time. The vertical lines are the times at which the ehk.t_saa value goes to and from 0.