.. index:: CTI Charge Injection .. _calobs-block-pv-vis-cti-timingsequence: **CALBLOCK-PV-034:** VIS Charge Injection Timing ================================================ .. include:: definitions.rst Parent requirement ------------------ | `R-CAL-B-VS-4355 `_ | `R-CAL-B-VS-4356 `_ Observation configuration file ------------------------------ | :download:`ocf_CALBLOCK-PV-034_CI-DELAY.csv ` | :download:`ocf_CALBLOCK-PV-034_CI-DARKS-15.csv ` Scheduling ---------- In case of failure, repeat as soon as possible. This calibration should be taken when radiation damage to the detectors is still very low. - **CI-DELAY variant:** Execute 2 sequence blocks during PV phase; each block consisting of 4x the CIL sequence listed below. One block to be executed at the beginning with CALBLOCK-PV-028, and one at the end of PV phase. - **CI-DARKS-15 variant:** Run once for each particular SAA/AA spacecraft attitude of interest. Time-critical ------------- The observations should be performed as close in time as possible to the ROS-type (32 CIL pattern) nominal charge injection block :ref:`calobs-block-pv-vis-cti-charge-injection`. Dependencies ------------ None Objective --------- - **CI-DELAY variant:** Add additional information about trap capture and release times by varying the charge injection speed. - **CI-DARKS-15 variant:** These observations provide verification of straylight signal reconstruction in Charge Injection images. The reconstruction will be derived from a standard Dark image with the same straylight attitude. For details, refer to the CI-DARK-AB variant Objective of :ref:`calobs-block-pv-vis-cti-charge-injection`. Observations ------------ - **CI-DELAY variant:** THere are 6 different combinations of ID_DELAY and TOI_CHG_INJ to be executed: .. csv-table:: **Variable charge injection data (PV).** :download:`CSV file ` :file: tables/ci_timing.dat Constant CIL parameters for all ID_DELAY and TOI_CHG_INJ combinations: * EXPTIME = 1 ms * DAC_IDL = 10.5 V * ID_WIDTH = 60 us * CHG_INJ_ON = 260 * CHG_INJ_OFF = 1790 * VSTART_CHJ_INJ = 16 * VEND_CHJ_INJ = 2066 * VSTART = 0 * VEND = 2086 * :math:`30\mu{\rm s}` DWELL (CHINJ_RoDly) = OFF * DAC_IG1 = 4.75 V * DAC_IG2 = 6 V The 6 different CIL sequences are interleaved with a BIAS to constitute a timing scan. The scan is repeated 4x in a single sequence block: .. code-block:: none :caption: Charge Injection Timing Scan, single sequence block. This sequence block is to be executed twice during PV. Repeat 4x: BIAS, CIL-1, CIL-2, CIL-3 dither (for HGA repointing) BIAS, CIL-4, CIL-5, CIL-6 dither (for HGA repointing) - **CI-DARKS-15 variant:** The timing parameters (ID_DELAY, TOI_CHG_INJ) affect the CI-Dark outcome, and hence we have 5 different CI parameter configurations 1, 2, 3, 4 and 5. These configuration correspond to the first 5 CI timing configurations as given above. Entry 6 in the table is the same as configurations B in the CI-DARK-AB variant of :ref:`calobs-block-pv-vis-cti-charge-injection`, and will not be repeated in this CALBLOCK. At each pointing, take a Bias, 2x Darks, and 4x charge injections (CI) frames with no charge injected ("CI-Dark"). The straylight dependence will be studied in depth in :ref:`calobs-block-pv-vis-cti-charge-injection`, which require >3 straylight levels. Here we study the timing dependence, hence a minimal set of straylight levels is used. .. code-block:: none :caption: Timing-related Charge-Injection Dark (CI-Dark) sequence. for each AA = [0.0, -2.5, -5.5]: BIAS, DARK, DARK, CIDark-1, CIDark-1, CIDark-1, CIDark-1 dither BIAS, DARK, DARK, CIDark-2, CIDark-2, CIDark-2, CIDark-2 dither BIAS, DARK, DARK, CIDark-3, CIDark-3, CIDark-3, CIDark-3 dither BIAS, DARK, DARK, CIDark-4, CIDark-4, CIDark-4, CIDark-4 dither BIAS, DARK, DARK, CIDark-5, CIDark-5, CIDark-5, CIDark-5 dither Fulfilling ---------- Complements :ref:`calobs-vis-cti-cil` Targets and pointing constraints -------------------------------- :command:`Pointing`: Straylight suppression as per MOCDA-SYS-003, and specifically :math:`{\rm SAA} > 92` for **CI-DELAY variant**. :command:`Pointing`: Straylight variability for **CI-DARKS-15 variant**: :math:`{\rm AA} = [-5.5, -2.5, 0.0]`. No specific target required. Instrument configuration ------------------------ Instrument: Wide survey Methodology / Uplink procedure ------------------------------ :command:`Entity`: VIS :command:`Commanding Method`: None :command:`Dither Sequence`: None Inter-operability constraints ----------------------------- None In-orbit duration ----------------- :command:`In-orbit Duration`: 16.1 h + dither (x31) | CI-DELAY Variant: 2.5 h + dither (x8) [single block duration] A block must be repeated once later in the PV phase, for a total of two blocks. | CI-DARKS-15 Variant: 2659s x 5 x 3 = 11.1 h + dither (x15) Note that 66s of CDPU processing time has been absorbed into each dither/slew. Data volume ----------- ``Total = 28310 MB`` | ``(2*4+15)*VB = 5750 MB`` for the Bias | ``6*VC(330MB) * 4 = 7920 MB`` for the CI | ``15*VC(330MB) = 4950 MB`` for the CI-Dark | ``30*VD = 9690 MB`` for the Darks Processing input ---------------- :command:`Ground Processing Input Data`: :command:`Data Description`: 8 BIAS (LE1) and 24 CIL (LE1) [CI-DELAY variant] 15 BIAS, 30 DARKs, 60 CI-Darks (LE1) Processing method ----------------- Binning, Cosmic Ray Flagging, CTI correction tools in VIS_CTI PE. Processing output ----------------- Master Charge Injection Non-uniformity Pattern. Statistics on Charge Injection temporal consistency. Initial CTI model. Required accuracy, constraints ------------------------------ | `R-CAL-B-VS-4354 `_ | `R-CAL-B-VS-4355 `_ | `R-CAL-B-VS-4356 `_ | `R-CAL-B-VS-4358 `_ Processing tools ---------------- VIS_CTI IOT analysis Quality control parameters -------------------------- DataModel: ``_ Contact person -------------- VIS instrument scientist .. raw:: latex \clearpage