MTA SIM Movement Monitoring

These pages track the movement of Chandra's Science Instrument Module (SIM). Motion between detectors and focus positions is plotted. Data is processed using full-frame raw telemetry, so the temporal resolution is about 32s. Moves between ACIS-I and ACIS-S are usually shorter than 32s, so times shown below for these moves are understated. Processing parameters/assumptions include a maximum move time of 500s and minimum time "settled"at a particular detector of 1500s.

SIM Position --- SIM position when it stays at the same spot more than 1,500 seconds

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  TSC Position (z-axis) FA position (x-axis) Max Pulse Width Modulation
ACIS-I
ACIS-S
HRC-I
HRC-S

Note: Instruments and Expected SIM Ranges

ACIS I 89000 94103
ACIS S 71420 76823
HRC I -51705 -49306
HRC S-100800 -98400

SIM Transit Times --- A total transition time from one instrument to another

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ACIS-I
ACIS-S
HRC-I
HRC-S

SIM Stepping Times --- A length of time to take each step

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ACIS-I
ACIS-S
HRC-I
HRC-S

Summary Table

FromTo# ObsTime (sec)/ StepAverage Time
ACIS-IACIS-S10540.0020835.0+/-13.4
ACIS-IHRC-I850.00135191.9+/-18.4
ACIS-IHRC-S5970.00136260.5+/-18.0
ACIS-SACIS-I9920.0020734.5+/-11.5
ACIS-SHRC-I6450.00127158.8+/-21.5
ACIS-SHRC-S22740.00132228.8+/-22.3
HRC-IACIS-I980.00134188.8+/-14.7
HRC-IACIS-S3300.00129161.4+/-13.6
HRC-IHRC-S4170.0011755.3+/-24.7
HRC-SACIS-I7090.00131258.7+/-12.9
HRC-SACIS-S23900.00132229.2+/-18.9
HRC-SHRC-I1090.0016072.5+/-25.3

SIM Cumulative Trends


Last Modified: Feb 17, 2021

If you have any quesitons, plase contact: swolk@cfa.harvard.edu