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HIFI ILT Readiness Review Aug 15-16, 2006 Instrument Stability

HIFI ILT Readiness Review Aug 15-16, 2006 Instrument Stability. Jacob Kooi, Caltech Volker Ossenkopf, SRON/Koln Michael Olberg, Chalmers Rudolf Schieder, Koln David Teyssier, ESAC. J. Radiometry (David Teyssier). Total Power Stability (100-200 spectra, ¾ WBS, 1s readout rate)

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HIFI ILT Readiness Review Aug 15-16, 2006 Instrument Stability

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  1. HIFI ILT Readiness ReviewAug 15-16, 2006Instrument Stability Jacob Kooi, Caltech Volker Ossenkopf, SRON/Koln Michael Olberg, Chalmers Rudolf Schieder, Koln David Teyssier, ESAC

  2. J. Radiometry (David Teyssier) • Total Power Stability (100-200 spectra, ¾ WBS, 1s readout rate) B1-5: every 4 GHz B6-7: 52 freq/LO-band L1. IF Stability (LO-off, mixer biased at 8mV) • IF2 on, IF 1 off • IF2 on, IF 1 on and temperature stabilizing • IF2 on, IF 1 on temperature stabilized L2. System Stability (2 LO freq/band) • TP System Gain Stability • Load-Chop Differential System Stability • Internal Load Differential System Stability • Frequency Switching Differential Stability L3. Parametric Stability (2 stable, 2 unstable LO freq/band) • LO Standing Wave stability scan • Stability as a function of Vbias • Stability as a function of Ibias (change Plo) • Stability as a function of B-field • Stability as a function of Diplexer position Overview HIFI-ILT Stability Tests

  3. Overview HIFI-ILT Interactive Analyses • Standard HK (During Test Session) • Quick Look Analyses (QLA) During Test Session (night time) • -At start new measurement show WBS Comb, attenuation setting, illumination. • -Basic HK values such as bias, B-field, frequency (n. a. here), temperature etc. • -For each measurement (obsid) show T.P. vs time for the 4 WBS sub-bands • (for each sub-band take mean of all channels). 2 polarizations  2 plots, 8 curves. • -For each measurement (obsid) show TP vs time for HRS zero lag channel. • 2 polarizations  1 or 2 plots. • Keep track of possible bad scans (TP variation >= 5%). • -Record obsid of each stability measurement (table). This can be used in QIA • Quick IA (QIA). Day after Test Session to provide feedback to operators • -From the obsid stability table (QLA), batch-generate: • -A table with flagged total power vs time variations >= 5%. (can be a variable). • -Batch calculate for each passed obsid: • -Total power Allan variance for each (H+V) WBS & HRS channel • -Spectroscopic Allan variance for each (H+V) WBS & HRS channel (zero order baseline subtraction). • -Display in a 3x3 matrix for each obsid (WBS and HRS in separate pages): • -Time series of the average WBS level (H + V, 2 curves). • -Time series of room, cryostat, and spectrometers temperatures • -Averages bandpass vs. IF frequency (H + V, 2 curves). • -Normalized total power Allan variance for each sub-band and full spectrometer (V + H) • -Normalized spectroscopic Allan variance for each sub-band and full spectrometer (V + H) • -Difference spectrum of two subsequent 200s bins (H + V). This shows platforming. • -Color plot of normalized total power Allan variance for each spectrometer channel • - Calculate and Display for each spectrometer (WBS and HRS) • -Ta where radiometer noise equals drift noise (each sub band + total spectrometer) • -Ta’ for which the total noise exceeds twice the radiometer noise. • -Ta’’ for which the total noise exceeds 50% of the radiometer noise. (Compare with the theoretical variances.) • -Equivalent noise fluxuation bandwidth for each radiometer sub-band. • -Slope of the drift term (Beta) • -Display HK data such as bias, frequency, spectrometer settings • -Ability to write certain, or all graphs, to file.

  4. 1. Radiometery -Obtain TP stability alongside each Radiometry LO frequency setting. • 2. IF Stability -Verify amplitude stability of the IF system including that of the spectrometers. -Determine the influence of the environment (i.e. temperature). -Search for, and measure plat-forming effects spectrometers. -Characterize IF system stability with IF1 switched OFF (IF2 On), and IF1 warming up. • 3. System Stability -Verify 2 scientifically interesting LO frequencies per mixer band -Verify the internal Hot/Cold calibration load differential amplitude stability. -Determine the observing efficiency loss due to instability. -Search for plat forming effects, baseline offsets -Search for weak spurious line signals. • 4. Parametric Stability -Verify receiver stability at 2 stable, and two potentially unstable scientific interesting LO frequencies. -Determine the influence of the environment (i.e. temperature) on instrument stability. -Determine the observing efficiency loss due to instability. (Compute RMS noise level) -Understand the effect of the LO standing wave on the HIFI total power stability. Determine the free spectral range of the mixer-LO cavity. Verify that tuning to the peak of the standing wave is possible/practical. Note: There are two mixers, only one of the mixers can be tuned to the peak of the standing wave -Understand the effect of mixer bias voltage on the HIFI instrument total power stability. -Understand the effect of mixer bias current on the HIFI instrument total power stability. -Understand the effect of B-field on the HIFI instrument total power stability. -Understand the effect of diplexer position on the HIFI instrument total power stability. Objectives

  5. Requirements • Temperature sensors on FPU, LOU, Cryostats, and ambient temperature. • HIFI has passes functional test (FPU, FCU, ICU, LOU, WBS(2), HRS(2), HK….) • Test Control software ready • Compressed IA (CIA) software ready. • HCSS/Database Pipeline up and stable. • Readout time/data transfer rate for all channels WBS(2) and HRS(2) = 4 second verified. • Readout time/data transfer rate for ¾ WBS(2) = 1 second verified (Needed for B6, B7). • Install reflector inside external black body

  6. Total Power: Ta >20s (1.5 MHz BW) Total Power: Ta >2s (1.5 MHz BW) Gas Laser, 2.5 THz B=100 MHz HEB, Solid State LO IF Stability Example T.P. HEB Example T.P. SIS Example Total Power SIS (B1-5) vs. HEB (B6,7) Stability Ta’ = Ta (B/B’)0.5 Acquisition Time ~ 100 Ta’ Spectroscopic SIS stability: Ta >40 sec (1.5 MHz BW)

  7. Total Power Stability HEB Ta >2s (1.5 MHz BW) 50 MHz BW Spectroscopic Stability HEB Ta >15 sec (1.5 MHz BW) 1462 GHz, LO in air 50cm Example from HEB Test Campaign (2004) 50 MHz BW 1462 GHz, LO in air 50cm

  8. IF Stability Test Procedure B1-B7 Configure instrument, stabilize if necessary. Mixer is unpumped (LO-off) for mixer_band = 1, 7 do begin { select WBS and HRS in low resolution mode IF 1 Off, IF2 On adjust IF level perform WBS cal using the internal calibration source (zero-comb, RD20) for i = 0, 450 do { (30 minutes with IF 1 off, IF 2 on) acquire WBS/HRS spectrum {4sec} } IF 1 On, IF2 On, Junction biased at 8 mV (SIS and HEB) adjust IF level perform WBS cal using the internal calibration source (zero-comb, RD20) for i = 0, 450 do { (30 minutes warm up with IF 1 on, IF 2 on) acquire WBS/HRS spectrum {4sec} } perform WBS cal using the internal calibration source (zero-comb, RD20) for i = 0, 900 do { (IF stability measurement, repeat 1 hour) acquire WBS/HRS spectrum {4sec} } perform WBS cal using the internal calibration source (zero-comb, RD20) for Vbias = 5, 10 step 1 { (mV, IF 1 On, IF2 On) acquire WBS/HRS spectrum {12sec} } } end CUS script names: Testmode_stability_noIF1 Testmode_stability_IF_system (both for warm up and stability measurement) Note1: This test will take 2h per band Note2: Dead time between spectrometer is assumed negligible. Housekeeping data should be acquired and stored throughout this and other test procedures.

  9. Total Power SystemStability Test Procedure (B1-B5)Configure instrument, nom bias, B-field, diplexer .., stabilize for mixer band = 1, 5 do begin { select WBS and HRS in low resolution mode (4 second readout)) select Internal Cold BB for freq = flo1, flo2 (2 LO frequencies near the edge of the band) adjust IF level perform WBS cal using the internal calibration source for i = 0, 600 do { (40 min) acquire WBS/HRS spectrum {4sec} } select focal plane chopper, fast chop mode. perform WBS cal using the internal calibration source for i = 0, 10 do (Measure Y-factor, 20 seconds) select chopper internal Cold BB acquire WBS/HRS spectrum {1sec} select chopper internal Hot BB acquire WBS/HRS spectrum {1sec} } }}end SIS HEB Test Procedure (B6-B7) Configure instrument, nom bias, B-field, diplexer .., stabilize for mixer_band = 6, 7 do begin { select both ¾ WBS low resolution mode (1 second spectrometer readout) select Internal Cold BB for freq = flo1, flo2 { (2 LO frequencies near the edge of the band) adjust IF level perform WBS cal using the internal calibration source for i = 0, 1200 do { (20 min) acquire ¾ WBS spectrum {1sec} } select focal plane chopper, fast chop mode. perform WBS cal using the internal calibration source for i = 0, 10 do { (Measure Y-factor, 20 seconds) select chopper internal Cold BB acquire WBS/HRS spectrum {1sec} select chopper internal Hot BB acquire WBS/HRS spectrum {1sec} } } } end CUS script name: Testmode_stability_intcold Note1: Total integration time B1-B5: 2x40 minutes, and B6-B7: 2x20 minutes. Note2: Consider taking measurement during LO warm-up (1h). Note3: Readout ¾ WBS (3 sub-bands) to achieve 1 second readout time. Housekeeping data should be acquired and stored throughout this and other test procedures.

  10. Load-Chop DifferentialSystemStability Test Procedure (B1-B5)Configure instrument, nom bias, B-field, diplexer .., stabilize for mixer_band = 1, 5 do begin { select both WBS, HRS low resolution mode (4 second readout) select focal plane chopper, slow chop mode for freq = flo1, flo2 (2 LO frequencies near the edge of the band) adjust IF level perform WBS cal using the internal calibration source for i = 0, 450 do { (1 hour) for i2 = 0, 1 do { (loop 2x) select chopper internal Cold BB acquire WBS/HRS spectrum {2sec} select chopper external Cold BB acquire WBS/HRS spectrum {2sec} } } }}end SIS HEB Test Procedure (B6-B7) Configure instrument, nominal bias, B-field, diplexer etc, stabilize for mixer_band = 6, 7 do begin { select both ¾ WBS, (no HRS) select focal plane chopper, fast chop mode for freq = flo1, flo2 { (2 LO frequencies near the edge of the band) adjust IF level Perform WBS cal using the internal calibration source for i = 0, 900 do { (1 hour) for i2 = 0, 1 do { (loop 2x) select chopper internal Cold BB acquire ¾ WBS spectrum {1sec} select chopper external Cold BB acquire ¾ WBS spectrum {1sec} } } } } end CUS script name: Testmode_stability_loadchop Note1: Total integration time 60 minutes/band Note2: Symmetric chop: Pc, Pc’, Pc’, Pc… Note3: Fast chop required for B6-B7 Housekeeping data should be acquired and stored throughout this and other test procedures.

  11. Frequency Switching DifferentialSystemStability Test Procedure (B1-B5)Configure instrument, nom bias, B-field, diplexer .., stabilize for mixer_band = 1, 5 do begin { select both WBS, HRS low resolution mode (4 second readout) select focal plane chopper, slow chop mode for freq = flo1, flo2 (2 LO frequencies near the edge of the band) adjust IF level perform WBS cal using the internal calibration source for i = 0, 450 do { (1 hour) for i2 = 0, 1 do { (loop 2x) select delta_flo1 acquire WBS/HRS spectrum {2sec} select delta_flo2 acquire WBS/HRS spectrum {2sec} } } }}end SIS HEB Test Procedure (B6-B7) Configure instrument, nominal bias, B-field, diplexer etc, stabilize for mixer_band = 6, 7 do begin { select both ¾ WBS, (no HRS) select focal plane chopper, fast chop mode for freq = flo1, flo2 { (2 LO frequencies near the edge of the band) adjust IF level Perform WBS cal using the internal calibration source for i = 0, 900 do { (1 hour) for i2 = 0, 1 do { (loop 2x) select delta_flo1 acquire ¾ WBS spectrum {1sec} select delta_flo2 acquire ¾ WBS spectrum {1sec} } } } } end CUS script name: Testmode_stability_freqswitch Note1: Total integration time 60 minutes/band Note2: Symmetric chop: delta_flo1, delta_flo2, delta_flo2, delta_flo1… Note3: Fast chop required for B6-B7 Housekeeping data should be acquired and stored throughout this and other test procedures.

  12. Parametric Stability: LO Standing Wave Test Procedure (B1-B5)Configure instrument, nominal bias, B-field, diplexer…, stabilize for mixer_band = 1, 5 do begin { select both HRS low resolution mode for 4 different LO frequencies { (2 stable, and 2 unstable) select chopper internal Cold BB adjust IF levelfor delta_flo = 0, 500, step 10 MHz { acquire HRS zero lag spectrum {5sec}}Plot 500 MHz TP scan (QLA), find standing wave pattern, (Sine function with possibly multiple frequency components), then for 5 selected frequencies at the peak, valley, steepest part…. of the LO standing wave do: (this may have to happen manually with user input!) select chopper internal Cold BB perform WBS cal using the internal calibration source for delta_flo = 0, 200, step flo1-flo5 { (scan 200 MHz in 5 LO frequency steps) for i = 0, 180 do { (6 minutes worth of TP data) acquire WBS spectrum {2sec} } select focal plane chopper, fast chop mode. perform WBS cal using the internal calibration source for i = 0, 10 do { (Measure Y-factor, 20 seconds) select chopper internal Cold BB acquire WBS/HRS spectrum {1sec} select chopper internal Hot BB acquire WBS/HRS spectrum {1sec} } } } }end SIS HEB Test Procedure (B6-B7)Configure instrument, nominal bias, B-field, diplexer…, stabilize for mixer_band = 6, 7 do begin { select both HRS low resolution mode for 4 different LO frequencies { (2 stable, and 2 unstable) select chopper internal Cold BB adjust IF levelfor delta_flo = 0, 500, step 10 MHz { acquire HRS zero lag spectrum {5sec}}Plot 500 MHz TP scan (QLA), find standing wave pattern, (Sine function with possibly multiple frequency components), then for 5 selected frequencies at the peak, valley, steepest part…. of the LO standing wave do: (this may have to happen manually with user input!) select chopper internal Cold BB perform WBS cal using the internal calibration source for delta_flo = 0, 200, step flo1-flo5 { (scan 200 MHz in 5 LO frequency steps) for i = 0, 360 do { (6 minutes worth of TP data) acquire ¾ WBS spectrum {1sec} } select focal plane chopper, fast chop mode. perform WBS cal using the internal calibration source for i = 0, 10 do { (Measure Y-factor, 20 seconds) select chopper internal Cold BB acquire WBS/HRS spectrum {1sec} select chopper internal Hot BB acquire WBS/HRS spectrum {1sec} } } } }end Total integration time 2 hours/band

  13. Parametric Stability: Mixer Bias Voltage Test Procedure B1-B5Configure instrument, nominal bias current, B-field, diplexer, ..stabilize for mixer_band = 1, 5 do begin { select WBS/HRS low resolution mode for 4 different LO frequencies { (2 stable, and two unstable) select chopper internal Cold BB for Vsis= Vnom-0.2, Vnom-0.1, Vnom, Vnom+0.1, Vnom+0.2 { adjust IF level perform WBS cal using the internal calibration source for i = 0, 180 do { (6 minutes worth of TP data) acquire WBS spectrum {2sec} } select focal plane chopper, fast chop mode. adjust IF level perform WBS cal using the internal calibration source for i = 0, 10 do { (Measure Y-factor, 20 seconds) select chopper internal Cold BB acquire WBS/HRS spectrum {1sec} select chopper internal Hot BB acquire WBS/HRS spectrum {1sec} } } } }end SIS Test Procedure B6-B7Configure instrument, nominal bias current, B-field, diplexer, ..stabilize for mixer_band = 6, 7 do begin { select WBS/HRS low resolution mode for 4 different LO frequencies { (2 stable, and two unstable) select chopper internal Cold BB for Vheb= Vnom-0.2, Vnom-0.1, Vnom, Vnom+0.2, Vnom+0.4 { adjust IF level perform WBS cal using the internal calibration source for i = 0, 360 do { (6 minutes worth of TP data) acquire ¾ WBS spectrum {1sec} } select focal plane chopper, fast chop mode. adjust IF level perform WBS cal using the internal calibration source for i = 0, 10 do { (Measure Y-factor, 20 seconds) select chopper internal Cold BB acquire WBS/HRS spectrum {1sec} select chopper internal Hot BB acquire WBS/HRS spectrum {1sec} } } } }end HEB CUS script name: Testmode_Parameter_Scan_Investigation Note1: Total integration time 2 hours/band Note2: Symmetric chop on Y-factor scan Note3: Fast chop required Housekeeping data should be acquired and stored throughout this and other test procedures.

  14. Parametric Stability: Mixer Bias Current Test Procedure B1-B5Configure instrument, nominal bias current, B-field, diplexer, ..stabilize for mixer_band = 1, 5 do begin { select WBS/HRS low resolution mode for 4 different LO frequencies { (2 stable, and two unstable) select chopper internal Cold BB for Isis= Inom-25%, Inom, Inom+25% { (uA, Adjust JPL P.A. Vd) adjust IF level perform WBS cal using the internal calibration source for i = 0, 180 do { (6 minutes worth of TP data) acquire WBS spectrum {2sec} } select focal plane chopper, fast chop mode. adjust IF level perform WBS cal using the internal calibration source for i = 0, 10 do { (Measure Y-factor, 20 seconds) select chopper internal Cold BB acquire WBS/HRS spectrum {1sec} select chopper internal Hot BB acquire WBS/HRS spectrum {1sec} } } } }end SIS Test Procedure B6-B7Configure instrument, nominal bias current, B-field, diplexer, ..stabilize for mixer_band = 6, 7 do begin { select WBS/HRS low resolution mode for 4 different LO frequencies { (2 stable, and two unstable) select chopper internal Cold BB for Iheb= Inom-25%, Inom, Inom+25% { (uA, Adjust JPL P.A. Vd) adjust IF level perform WBS cal using the internal calibration source for i = 0, 360 do { (6 minutes worth of TP data) acquire ¾ WBS spectrum {1sec} } select focal plane chopper, fast chop mode. adjust IF level perform WBS cal using the internal calibration source for i = 0, 10 do { (Measure Y-factor, 20 seconds) select chopper internal Cold BB acquire WBS/HRS spectrum {1sec} select chopper internal Hot BB acquire WBS/HRS spectrum {1sec} } } } }end HEB CUS script name: Testmode_Parameter_Scan_Investigation Note1: Total integration time 1.5 hours/band Note2: Symmetric chop on Y-factor scan Note3: Fast chop required Housekeeping data should be acquired and stored throughout this and other test procedures.

  15. Parametric Stability: B-field Test Procedure B1-B5Configure instrument, nominal bias current, B-field, diplexer, ..stabilize for mixer_band = 1, 5 do begin { select WBS/HRS low resolution mode for 4 different LO frequencies { (2 stable, and two unstable) select chopper internal Cold BB for Bfield= Bnom-10%, Bnom-5%, Bnom, Bnom+10%, Bnom+25% { adjust IF level perform WBS cal using the internal calibration source for i = 0, 180 do { (6 minutes worth of TP data) acquire WBS spectrum {2sec} } select focal plane chopper, fast chop mode. adjust IF level perform WBS cal using the internal calibration source for i = 0, 10 do { (Measure Y-factor, 20 seconds) select chopper internal Cold BB acquire WBS/HRS spectrum {1sec} select chopper internal Hot BB acquire WBS/HRS spectrum {1sec} } } } }end SIS HEB Not Required CUS script name: Testmode_Parameter_Scan_Investigation Note1: Total integration time 2 hours/band Note2: Symmetric chop on Y-factor scan Note3: Fast chop required Housekeeping data should be acquired and stored throughout this and other test procedures.

  16. Parametric Stability: Diplexer Setting Test Procedure B3-B4Configure instrument, nominal bias current, B-field, diplexer, ..stabilize for mixer_band = 1, 5 do begin { select WBS/HRS low resolution mode for 4 different LO frequencies { (2 stable, and two unstable) select chopper internal Cold BB for Vdipl= Vdipl-25%, Vdipl, Vdipl+25% { adjust IF level perform WBS cal using the internal calibration source for i = 0, 180 do { (6 minutes worth of TP data) acquire WBS spectrum {2sec} } select focal plane chopper, fast chop mode. adjust IF level perform WBS cal using the internal calibration source for i = 0, 10 do { (Measure Y-factor, 20 seconds) select chopper internal Cold BB acquire WBS/HRS spectrum {1sec} select chopper internal Hot BB acquire WBS/HRS spectrum {1sec} } } } }end SIS Test Procedure B6-B7Configure instrument, nominal bias current, B-field, diplexer, ..stabilize for mixer_band = 6, 7 do begin { select WBS/HRS low resolution mode for 4 different LO frequencies { (2 stable, and two unstable) select chopper internal Cold BB for Vdipl= Vdipl-25%, Vdipl, Vdipl+25% { adjust IF level perform WBS cal using the internal calibration source for i = 0, 360 do { (6 minutes worth of TP data) acquire ¾ WBS spectrum {1sec} } select focal plane chopper, fast chop mode. adjust IF level perform WBS cal using the internal calibration source for i = 0, 10 do { (Measure Y-factor, 20 seconds) select chopper internal Cold BB acquire WBS/HRS spectrum {1sec} select chopper internal Hot BB acquire WBS/HRS spectrum {1sec} } } } }end HEB CUS script name: Testmode_Parameter_Scan_Investigation Note1: Total integration time 1.5 hours/band Note2: Symmetric chop on Y-factor scan Note3: Fast chop required Housekeeping data should be acquired and stored throughout this and other test procedures.

  17. Example QIA(Volker Ossenkopf) Total Power Stability, 4 WBS Sub-bands + Full WBS Total Power Stability, All Channels IF Passband Platforming Spectroscopic Stability, 4 WBS Sub-bands + Full WBS

  18. L2. System Stability: 56 hours • TP System Stability (2h/band for each test including LO stabilization) • Load-Chop Differential System Stability (2h/band (LO is assumed stabilized) • Internal Load Differential System Stability (2h/band (LO is assumed stabilized) • Frequency Switching Differential Stability (2h/band (LO is assumed stabilized) L3. Parametric Stability: 63 hours • LO Standing Wave Stability (2h/band) • Stability as a function of Vbias (2h/band) • Stability as a function of Ibias (1.5h/band) • Stability as a function of B-field (2h/band) • Stability as a function of diplexer position (1.5h/band) Time Estimate L1. IF Stability (LO Off): 14 hours 2 hours/band including IF2 warm-up Total Time: 133 hours (~16 nights at 8h/band)

  19. Conclusion • Stability procedures finalized • CUS Scripts mostly written (David Teyssier) • QIA ~80% done (Volker Ossenkopf) Needed: • Dry run of the CUS scripts (September) • in particular the ¾ WBS 1 second readout rate (Needed for B6-B7). • Dry run of the QIA with HCSS/Database (September) Wiki Page Procedures: http://www.sron.rug.nl/~wikiman/wikis/HifiIlt

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