MTA Monitoring Report 08/17/01 - 08/23/01

Archive of all weekly reports

Archive of Monthly reports

Radiation

Continued from last week:
SCS107 ran at 2001:228:02:08
SCS107 recovery made at 2001:229:15:43
Rad Zone entry at 2001:229:18:32
Return to science at 2001:230:13:43
Total lost science time: 40h 24m = 145.4 ks
obsid 1900 was partial, obsid 1880 will be rescheduled

ACIS/Radiation Environment correlations

CTI Trend

Average of ACIS-I CCDs (MnKa) slope 1.560e-8 CTI/day
Detrended slope 1.367e-8 CTI/day

ACIS Warm Pixels

The following pixels consistently showed a bias level more than 5 sigma away the chip's mean level during this period.
For more information see the link above and MTA monthly reports.

ACIS Focal Temperature

For this period, 2 peaks were observed.

MTA Problem Tracking

Note: Problem Tracking system is currently not working properly. Many problems reported are not listed on the table.

SIM Movements

14 TSC moves this period
weekly average time/step 0.00137 s
mission average time/step 0.00136 s

Telemetry

8/17 8/18 8/23

Recent Observations

The ACA Problem is in the specified handling of guide star positional errors.
This issue in not significant to the final product and so is being worked at low priority.
OBSID DETECTOR GRATING TARGET ANALYSIS ACA
2097 ACIS-S NONE 3C 334 OK Problem
2513 ACIS-S NONE WZ SGE CC - OK OK
2413 HRC-I NONE M15 OK OK
2195 ACIS-S NONE 3C 452 OK OK
2099 ACIS-S NONE LBQS 0021-0213 OK Problem
2074 ACIS-I NONE NGC7619/NGC7626 OK Problem
993 HRC-S NONE VEGA CAL - OK OK
991 HRC-S NONE VEGA CAL - OK OK
989 HRC-S NONE VEGA CAL - OK OK
987 HRC-I NONE VEGA CAL - OK OK
2426 ACIS-I NONE PSR J1740+1000 CC - OK OK
983 ACIS-I NONE HD 152404 OK OK
982 ACIS-I NONE HD150193 OK Missing
1989 ACIS-I NONE PSR J1740+1000 OK OK
1965 ACIS-S NONE MSH15-56 OK OK
2317 ACIS-I NONE RCW103 OK OK
3360 ACIS-S NONE NGC 6440 TOO - OK OK
1012 HRC-S LETG HZ43 OK /Grat OK
2506 HRC-S LETG WZ SGE TOO /Grat OK
1900 HRC-S LETG CAL 83 Partial /Grat OK

Trending

This Week's focus HRC.
Temperatures in degrees K.
Current in amps.
Voltage in volts.

No significant changes since last reported on Jun 07 .
The most interesting trends are indicated with "*".

Comments about the rise in HRC temperatures.
from Mark Freeman -
First, HRC is passively cooled by radiating to the inner wall of the ISIM. As the optical surface treatments of the SIM degrade (both the OSRs
and the white paint will gradually do so), we should expect the temperatures of the HRC to rise slowly. Secondly, because during
almost all of the OAC period we were at or near "normal sun", which is a cold orientation for the SIM, with the passive behavior we would
expect temperatures to be lower and show less scatter. If you look at the graphs, this is indeed the case. If the OAC period were removed
from the trendline I think that the trends, though still upward, would be significantly flatter.

Overall, I think this looks pretty much like what we expected.
Aug 25, 2001