MTA Monitoring Report 01/30/15 - 02/05/15

Archive of all weekly reports
Archive of monthly reports

Radiation

Quiet

Detrended CTI

Although we prefer to quote CTI values of the cleanest data (FT <= -119.7 C, int time > 7000sec), the data that fulfills these conditions are getting rare. We now quote CTI based on temperature corrected data for Focal plane temperature <= -118.5 C).

The unit is now CTI/year not CTI/day.

ACIS Warm Pixels

We display all bad pixels that have showed up in past, and, if any, previously unknown bad pixels appeared in the last 14 days. We also list hot pixels (defined as 1000 above the average of bias background). Warm columns 509-514 are probably due to boundaries.

New definitions of warm pixels and flickering pixels (May 15, 2014). If a pixel displays the level beyond a threshold for more than 70% of the time in the past two weeks, the pixel is categorized as a "warm" pixel. If a pixel is above the threshold more than 30% of time but less than 70% of the time in the past two weeks, the pixel is categorized as a "flickering" pixel.

ACIS Focal Plane Temperature

For this period, 3 peaks are observed.

Day (DOY)	Temp (C)	Width (Days)
30.18	-116.15	0.30
30.43	-111.79	0.25
31.35	-118.37	0.07
31.76	-118.44	0.01
31.81	-118.31	0.10
33.13	-111.14	0.90
35.40	-115.93	0.93
35.73	-112.44	0.26

Weekly focal plane temperature with sun angle, earth angle, and altitude overplotted. Sun angle is the solar array angle, that is the angle between the sun and the optical axis (+X axis). The earth angle is the angle between earth and the ACIS radiator (+Z axis). Altitude varies from 34 kkm to 128 kkm.

Telemetry

New violations or new extrema are shown in blue cells.

IRUs

• Gyro Bias Drift
• Gyro Bias Drift Histogram

Recent Observations

Trending

This week's focus is SIM.

Last reported on Nov 20 (2014).

Only the most interesting or representative msids are shown below. For a full listing choose the bulletted link.

Min/max envelopes in dark blue appear on the trending plots. The envelopes are 4th degree fits to the monthly minimum and maximum values for each MSID. The final polynomial form and binning are still being experimented with. We will soon add to the trending pages a report of the fits and predictions they give on future limit violations. The light blue curve is our original smoothing of all the data over 30 day moving boxcars. The green/yellow line is a linear fit to all the data; the break occurs at a limit change.

SIM Thermal

MSID	MEAN	RMS	DELTA/YR	DELTA/YR/YR	UNITS	DESCRIPTION
3FABRCAT	271.48	8.00	1.296e-01	8.340e-01	K	FA STRUCTURE AT BEARING C ABORT HTR. FA6 TEMP
3FAMYZAT	271.92	11.42	-5.743e-01	2.729e+00	K	FA STRUCTURE +X FACE AT -Y-Z END ABORT HTR. FA6 TEMP
3FAPYZAT	269.33	6.15	-9.527e-01	3.227e+00	K	FA STRUCTURE +X FACE AT +Y+Z END ABORT HTR. FA6 TEMP
3TSMXCET	227.18	30.85	1.403e+00	1.538e+00	K	-X TURTLE SHELL NR HRC CEA
3TSMXSPT	271.41	29.82	-9.258e-01	3.903e+00	K	-X TURTLE SHELL NR ACIS SS
BOXTEMP	282.83	2.13	-4.087e-01	9.684e-01	K	SEA box temperature (3FASEAAT)
FAMTRTEMP	276.60	5.33	-1.117e+00	1.370e-02	K	FA motor temperature
FLEXATEMP	270.06	3.20	1.995e-02	1.250e+00	K	Flexure A temperature (3FAFLAAT)
PSUTEMP	312.26	1.91	-5.645e-01	8.198e-01	K	SEA power supply temperature (3FAPSAT)

SIM Thermal - Previous Quarter

MSID	MEAN	RMS	DELTA/YR	DELTA/YR/YR	UNITS	DESCRIPTION
3FABRCAT	271.91	7.89	2.026e+01	1.053e-12	K	FA STRUCTURE AT BEARING C ABORT HTR. FA6 TEMP
3FAMYZAT	271.20	10.49	2.352e+01	-6.326e-12	K	FA STRUCTURE +X FACE AT -Y-Z END ABORT HTR. FA6 TEMP
3FAPYZAT	268.94	3.32	7.987e+00	2.024e-12	K	FA STRUCTURE +X FACE AT +Y+Z END ABORT HTR. FA6 TEMP
3TSMXCET	239.11	3.378e+01	-3.767e+01	5.852e-12	K	-X TURTLE SHELL NR HRC CEA
3TSMXSPT	279.48	3.177e+01	-3.467e+01	1.815e-11	K	-X TURTLE SHELL NR ACIS SS
BOXTEMP	282.54	1.71	2.147e+00	2.500e-13	K	SEA box temperature (3FASEAAT)
FAMTRTEMP	272.54	3.02	8.250e+00	-3.534e-12	K	FA motor temperature
FLEXATEMP	271.04	2.99	7.786e+00	-9.111e-13	K	Flexure A temperature (3FAFLAAT)
PSUTEMP	311.27	1.38	1.200e+00	1.931e-13	K	SEA power supply temperature (3FAPSAT)

If you have any questions, please contact: swolk@head.cfa.harvard.edu