Scope of this technical note is to report on the RCA_SPR test performed on the LFI 30 GHz RCA
Qualification Model

VILLA, Fabrizio

OA@INAF - Istituto Nazionale di Astrofisica

2005Publication Year2023-02-15T15:57:03ZAcceptance in OA@INAFRCA_SPR Test Report on the 30 GHz RCA QMTitleVILLA, FabrizioAuthorshttp://hdl.handle.net/20.500.12386/33495HandlePL-LFI-PST-TN-065Number IASF/INAF Sezione di BOLOGNA LFI Project System Team Planck LFI   TITLE: RCA_SPR Test Report on the 30 GHz RCA QM DOC. TYPE: TECHNICAL NOTE PROJECT REF.: PL-LFI-PST-TN-065 PAGE:  I of IV, 19 ISSUE/REV.: 1.0 DATE:  May 2005 Prepared by  F. VILLA LFI Project System Team Date: Signature: May 10th, 2005  ___________________   Checked by  A. MENNELLA  L. STRINGHETTI LFI Project System Team Date: Signature: May 10th, 2005   ___________________   Agreed by  C. BUTLER LFI Program Manager  Date: Signature: May 10th, 2005  ____________________  Approved by N. MANDOLESI LFI Principal Investigator Date: Signature: May 10th, 2005  ____________________  RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page: PL-LFI-PST-TN-0651.0May 2005ii IASF/INAF – Sezione di BOLOGNA LFI Project System Team  DISTRIBUTION LIST Recipient Company / Institute E-mail address SentT. PASSVOGEL ESA – Noordwijk Thomas.Passvogel@esa.int  Yes G. CRONE ESA – Noordwijk Gerald.Crone@esa.int Yes  J. MARTI-CANALES ESA – Noordwijk Javier.Marti.Canales@esa.int Yes J. TAUBER ESA – Noordwijk Jan.Tauber@esa.int Yes     N. MANDOLESI IASF/INAF – Sez. Bologna mandolesi@bo.iasf.cnr.it Yes C. BUTLER IASF/INAF – Sez. Bologna butler@bo.iasf.cnr.it Yes M. BERSANELLI UniMI – Milano marco.bersanelli@fisica.unimi.it Yes M. BALASINI ALENIA SPAZIO – LABEN Balasini.m@laben.it Yes G. CAFAGNA ALENIA SPAZIO – LABEN Cafagna.g@laben.it Yes M. MICCOLIS ALENIA SPAZIO – LABEN miccolis.m@laben.it Yes P. LEUTENEGGER ALENIA SPAZIO – LABEN Leutenegger.p@laben.it Yes LFI CALIBRATION TEAM   Yes                 LFI CO-I’s   Yes LFI Local PROGRAM MANAGER   Yes                                         LFI SPCC IASF/INAF – Sez. Bologna lfispcc@bo.iasf.cnr.it Yes       RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page: PL-LFI-PST-TN-0651.0May 2005iii IASF/INAF – Sezione di BOLOGNA LFI Project System Team  CHANGE RECORD  Issue Date Sheet Description of Change Release1.0 May 10, 2005 All First Issue of the Document ===                                                                                                                                                              RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page: PL-LFI-PST-TN-0651.0May 2005iv IASF/INAF – Sezione di BOLOGNA LFI Project System Team  TABLE OF CONTENTS TABLE OF CONTENTS .............................................................................................................................. IV 1 INTRODUCTION AND SCOPE ........................................................................................................... 1 2 APPLICABLE DOCUMENTS .............................................................................................................. 2 3 REFERENCE DOCUMENTS................................................................................................................ 2 4 MEASUREMENT SETUP ..................................................................................................................... 3 4.1 THE SOURCE....................................................................................................................................... 3 4.2 THE INJECTOR.................................................................................................................................... 4 4.3 RF TRANSMISSION LINE FROM SOURCE TO INJECTOR........................................................................ 4 4.4 FREQUENCY LIST............................................................................................................................... 5 5 DATA STEAM......................................................................................................................................... 7 5.1 COMPARISON BETWEEN THE TWO SCAN RUNS ................................................................................ 10 6 DATA ANALISIS AND CALIBRATION........................................................................................... 11        RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page : PL-LFI-PST-TN-0651.0May 20051   IASF/INAF – Sezione di BOLOGNA LFI Project System Team  1 INTRODUCTION AND SCOPE “Measurements of the radiometers’ bandpasses are necessary for the analysis of in-flight data. Unlike the radiometric gains and offset, which are calibrated in flight, bandpass measurements must be made before launch” [RD 1] – WMAP team  Band pass measurements are required by the calibration plan [AD1], which reports also the specification of the test:    ID – RCA_SPR  TEST NAME – RF Spectral Response  TEST DURATION – Estimated data taking time: 3 hours (Note that this test requires warmup-cooldown of facility – NOT included)  TEST PURPOSES – Measure the radiometer spectral response within the operational band. The shape of the band is needed, i.e. only a relative measurement is performed.  CONCEPTUAL DESCRIPTION – The spectral response is measured at RCA level by injecting a calibrated RF monochromatic source into the sky horn sweeping through the band. It is planned to perform this test at RCA level only, in cryogenic setup with the source coupled to the feedhorn aperture. The frequency of the input RF source is swept over the band of interest and the measured radiometer DC outputs are correlated with the input frequency to produce the RF frequency response. This test is done using the nominal operating mode and difference data.  NUMBER OF RCAs – ALL QM , ALL FM  OUTPUT PARAMETERS – Radiometer band shape (relative) as a function of frequency  ACCURACY – TBD   Measurements will be made by injecting a small signal into the sky horn and recording the radiometric response. For LFI radiometers, the basic idea is inject a narrow band signal onto the sky horn, calibrating in this way also the feedhorns and the OMTs. The signal is sweeping across the bandwidth of the RCA under test, nominally 20% of bandwidth, eventually enlarged to the full waveguide band. The radiometer output will be recorded and the bandpass response will be derived form data.  Scope of this technical note is to report on the RCA_SPR test performed on the LFI 30 GHz RCA Qualification Model.   RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page : PL-LFI-PST-TN-0651.0May 20052   IASF/INAF – Sezione di BOLOGNA LFI Project System Team  2 APPLICABLE DOCUMENTS [AD 1] M. Bersanelli, Planck–LFI Calibration Plan, PL–LFI–PST–PL–008 Issue/Rev 1.0  July 2003 [AD 2] LABEN, Planck LFI 30 and 44 GHz RCA Test and Calibration Plan, PL–LFI–LAB–PL–010 Rev/Ver 1.0  3 REFERENCE DOCUMENTS [RD 1] N. Jasorik, et al., Design, Implementation And Testing Of The Map radiometers, ApJ Supplement, Vol. 145, pp. 413–436 (2003) [RD 2] Agilent Technologys, 8360 Series Synthesized Sweepers User’s Handbook, Part No. 08360–90070, 1995 [RD 3] F.Villa, RCA Swept Source Measurement Setup, Planck LFI technical note, To be Configured (Draft)  RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page : PL-LFI-PST-TN-0651.0May 20053   IASF/INAF – Sezione di BOLOGNA LFI Project System Team  4 MEASUREMENT SETUP The sketch of the measurement setup is reported in  Figure 1.    FIGURE 1: SCHEME OF THE LFI RADIOMETER CHAIN ASSEMBLY PASSBAND MEASUREMENTS Here we describe the source, the injector and the waveguide system connecting the both. 4.1 THE SOURCE The source used during this test has been provided by FRACARRO RADIOINDUSTRIE S.p.A (http://www.fracarro.com) and is composed by:   • Agilent Synthesized sweeper HP 83650L S/N …     Huber – Suhner Sucoflex 100 coaxial cable with PC 2.4 mm female coax connectors.  See http://www.hubersuhner.com/ for cable specification.   • Agilent Male 2.4 mm Coax – WR22 rectangular waveguide transition HP Q281B    RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page : PL-LFI-PST-TN-0651.0May 20054   IASF/INAF – Sezione di BOLOGNA LFI Project System Team  4.2 THE INJECTOR The injector is composed by a truncated stainless steel WR28 rectangular waveguide inserted in one of the dedicated hole of the RCA sky load and supported by a Teflon cylinder.   FIGURE 2: INJECTOR CLOSE UP VIEW 4.3 RF TRANSMISSION LINE FROM SOURCE TO INJECTOR   FIGURE 3:  LEFT – DETAIL OF THE COAX – WG TRANSITION CONNECTED TO THE FEED THROUGH BY A WAVEGUIDE SECTION; RIGHT – DETAIL OF THE FLEXIBLE WAVEGUIDE END  Starting from the coax – waveguide transition, the transmission line is composed by:  • A straight section of WR22 copper waveguide connecting the transition to the cryofacility flange  • WR28 Waveguide feed through  with kapton window to interface the cryofacility to the external environment • A straight section of WR28 stainless steel waveguide  acting as a thermal brake • A WR28 flexible waveguide 1 meter long   RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page : PL-LFI-PST-TN-0651.0May 20055   IASF/INAF – Sezione di BOLOGNA LFI Project System Team  At the time of this measurement the WR28 coax–waveguide transition was not used because of the missing coaxial adapter to interface with the RF cable. 4.4 FREQUENCY LIST  Frequency list has been defined and inserted manually on the sweeper taking advantage of the LIST MENU instrument capabilities.    RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page : PL-LFI-PST-TN-0651.0May 20056   IASF/INAF – Sezione di BOLOGNA LFI Project System Team  Specifically, for each frequency point (801 maximum) the OFFSET and the DWELL need to be defined. They are the power offset in dB with respect the Output Power Level set in the instrument and the persisting time of a single frequency point, respectively.     FIGURE 4: MAP OF THE FREQUENCY MENU OF THE AGILENT SWEEPER USED IN THIS TEST   TABLE 1: DEFINITION OF THE LIST FREQUENCY. THE STEP PARAMETER IS THE FREQUENCY STEP. POINT ID FREQUENCY OFFSET [DB] DWELL [MSEC] 1 30 +6  3000 2 30 +0  3000 3 30 +3 3000 4 30 +0 3000 5 26.5 (Fstart) +3 3000 . . . . . . . . . . . . . . . . 1+−=stepFstartFstopN  40.0 (Fstop) +3 3000  RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page : PL-LFI-PST-TN-0651.0May 20057   IASF/INAF – Sezione di BOLOGNA LFI Project System Team  5 DATA STEAM Data have been taken on 10th March 2005 starting at 15h 21m 21s, ending at 17h 06m 48s in Universal Time and stored in five files formatted and named according to Rachel definition:  030LFI28_RCA_QM_SPR_200503101619.AUX.fits 030LFI28_RCA_QM_SPR_200503101619.CFG.fits 030LFI28_RCA_QM_SPR_200503101619.DAT.fits 030LFI28_RCA_QM_SPR_200503101619.ENV.fits 030LFI28_RCA_QM_SPR_200503101619.LOG.fits  Here, the plot of AUX files for all the four detectors:     Plot of the data stream for Detector 1 Plot of the data stream for Detector 2   Plot of the data stream for Detector 3 Plot of the data stream for Detector 4 FIGURE 5: PLOT OF THE DATA STREAM AT CRYO TEMPERATURE Since the injector (truncated waveguide) has been mainly aligned with one polarization, detector 1 and 2 are more sensible to swept source test than the detector 3 and 4.   To check this behavior, the data steam obtained at warm temperature with the injector rotated by 90 degrees is reported. It is evident that in these data the most sensible detectors are 3 and 4 instead of 1 and 2. Warm  RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page : PL-LFI-PST-TN-0651.0May 20058   IASF/INAF – Sezione di BOLOGNA LFI Project System Team  RCA_SPR was not foreseen by the RCA test plan and was performed in order to demonstrate the goodness of the SPR test setup.  The SPR data at warm temperature where obtained on 1st March 2005 starting at 17h 15m 52s and ending at  18h 41m 55s in Universal Time.  The files are the following   030LFI28_RCA_QM_XXX_200503011814.AUX.fits  030LFI28_RCA_QM_XXX_200503011814.CFG.fits  030LFI28_RCA_QM_XXX_200503011814.DAT.fits  030LFI28_RCA_QM_XXX_200503011814.ENV.fits  030LFI28_RCA_QM_XXX_200503011814.LOG.fits     Plot of the data stream for Detector 1 at ambient T Plot of the data stream for Detector 2 at ambient T   Plot of the data stream for Detector 3 at ambient T Plot of the data stream for Detector 4 at ambient T FIGURE 6: PLOT OF THE DATA STREAM AT AMBIENT TEMPERATURE  The data steam is composed by three different “areas” here listed (see Figure 7) • light blue: search of optimal power level  • mid blue: first set of scan (3 complete scans) with 0.5 GHz in step, hereafter called Run1 • dark blue: second set of scan (7 complete scans) with 0.1 GHz in step, hereafter called Run2   RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page : PL-LFI-PST-TN-0651.0May 20059   IASF/INAF – Sezione di BOLOGNA LFI Project System Team   FIGURE 7: DATA STEAM EXPLANATION The parameters of the two different set of scans are reported in the following tables.  TABLE 2: PARAMETERS OF THE FIRST FREQUENCY SCAN POWER LEVEL [DBM]……………………………………... –34 dBm TRIGGER SEQUENCE [DB]………………………………… [+6, 0, +3, 0] TRIGGER FREQUENCY [GHZ]…………………………....... [30, 30, 30, 30] TRIGGER TIME [MSEC]…………………………………….. [3000, 3000, 3000, 3000]   START FREQUENCY [GHZ]………………………………... 26.5 STOP FREQUENCY [GHZ]…………………………………. 40.0 STEP FREQUENCY [GHZ]…………………………………. 0.5 RELATIVE POWER LEVEL [DB]…………………………… +3 TIME [MSEC]……………………………………………… 3000 TABLE 3: PARAMETERS OF THE SECOND FREQUENCY SCAN POWER LEVEL [DBM]……………………………………... –34 dBm TRIGGER SEQUENCE [DB]………………………………… [+6, 0, +3, 0] TRIGGER FREQUENCY [GHZ]…………………………....... [30, 30, 30, 30] TRIGGER TIME [MSEC]…………………………………….. [3000, 3000, 3000, 3000]   START FREQUENCY [GHZ]………………………………... 26.5 STOP FREQUENCY [GHZ]…………………………………. 40.0 STEP FREQUENCY [GHZ]…………………………………. 0.1 RELATIVE POWER LEVEL [DB]…………………………… +3 TIME [MSEC]……………………………………………… 3000    RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page : PL-LFI-PST-TN-0651.0May 200510   IASF/INAF – Sezione di BOLOGNA LFI Project System Team   FIGURE 8: EXPLANATION OF A SINGLE SCAN. THE TRIGGER SEQUENCE IS PLOTTED IN LIGHT GREEN, WHILE THE SCAN OF THE RADIOMETER BAND IS PLOTTED IN DARK GREEN. AFTER THAT, ANOTHER TRIGGER SEQUENCE SET THE START OF A SECOND FREQUENCY SCAN. 5.1 COMPARISON BETWEEN THE TWO SCAN RUNS Here we report on the comparison between the two runs (Run1 & Run2) performed with different frequency Step. In Figure 9 the two swept are reported showing the excellent agreement, as expected. Data analysis has been applied on the Run2 only.    FIGURE 9: COMPARISON BETWEEN SCANS WITH DIFFERENT FREQUENCY STEP ON DETECTOR 1   RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page : PL-LFI-PST-TN-0651.0May 200511   IASF/INAF – Sezione di BOLOGNA LFI Project System Team  6 DATA  ANALYSIS, CALIBRATION, AND RESULTS 6.1 CALIBRATION AND ANALYSIS  Data analysis concept is reported in annex 1. Method 1 has been applied (see Annex 1).  A RaNA1 module (RaNA_spr) has been developed to analyze the swept source data for all the detectors. For this test calibration means to calibrate the power response of the RF test chain as a function of the frequency.  Data have been calibrated considering the attenuation of the WR22 waveguide in the 26.5–40 GHz range due to the coax – wg adapter has been used during the test.  From simulation the following attenuation behavior has been applied. It is stressed here that only a relative response is needed.  ( )( ) −⋅⋅⋅⋅+⋅=−meterdBL100144093.0101989.800568.031.309226ννν    FIGURE 10: RELATIVE (DECIMAL) ATTENUATION (1/L) OF THE RF TEST CHAIN USED A CALIBRATION CURVE. THE CURVE IS NORMALIZED TO 1 AT 30 GHZ                                                       1  RaNA is The radiometer analyser tool http://lucifer.mi.iasf.cnr.it/web/rana    RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page : PL-LFI-PST-TN-0651.0May 200512   IASF/INAF – Sezione di BOLOGNA LFI Project System Team  6.2 RESULTS Here the results as obtained with the RaNA_spr module. The band response, reported in dB, has been normalized at the value at 30 GHz. The following plots are referred to each of the 4 detectors and have been obtained using the second sweep with 0.1 GHz of step.  In addition a comparison between different swept has been reported.    FIGURE 11: DETECTOR 1 CALIBRATED BANDPASS SHAPE   FIGURE 12: DETECTOR 2 CALIBRATED BANDPASS SHAPE   RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page : PL-LFI-PST-TN-0651.0May 200513   IASF/INAF – Sezione di BOLOGNA LFI Project System Team   FIGURE 13: DETECTOR 3 CALIBRATED BANDPASS SHAPE      FIGURE 14: DETECTOR 4 CALIBRATED BANDPASS SHAPE    RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page : PL-LFI-PST-TN-0651.0May 200514   IASF/INAF – Sezione di BOLOGNA LFI Project System Team   FIGURE 15: DETECTOR 1 CALIBRATED BANDPASS SHAPE – COMPARISON BETWEEN DIFFEREN SWEPT     FIGURE 16: DETECTOR 2 CALIBRATED BANDPASS SHAPE – COMPARISON BETWEEN DIFFEREN SWEPT  RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page : PL-LFI-PST-TN-0651.0May 200515   IASF/INAF – Sezione di BOLOGNA LFI Project System Team   FIGURE 17: DETECTOR 3 CALIBRATED BANDPASS SHAPE – COMPARISON BETWEEN DIFFEREN SWEPT      FIGURE 18: DETECTOR 4 CALIBRATED BANDPASS SHAPE – COMPARISON BETWEEN DIFFEREN SWEPT     RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page : PL-LFI-PST-TN-0651.0May 200516   IASF/INAF – Sezione di BOLOGNA LFI Project System Team    FIGURE 19: COMPARISON OF THE CALIBRATED BANDPASS SHAPE OF THE FOUR DETECTORS –DET 1 IS BLACK; DET 2 IS BROWN; DET 3 IS RED, AND DET 4 IS ORANGE.      FIGURE 20: COMPARISON OF THE CALIBRATED BANDPASS SHAPE OF THE FOUR DETECTORS. DATA HAVE BEEN BINNED WITH A BINNING OF 2 POINTS.  –DET 1 IS BLACK; DET 2 IS BROWN; DET 3 IS RED, AND DET 4 IS ORANGE.   RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page : PL-LFI-PST-TN-0651.0May 200517   IASF/INAF – Sezione di BOLOGNA LFI Project System Team  7 ACKNOWLEDGEMENTS I wish to thanks FRACARRO Radioindustrie S.p.A (http://www.fracarro.com) for having provided the sweep generator, and accessories for six months during the QM campaign.  FRACARRO Radioindustrie S.p.A will provide also the instrument during the Flight Model Test Campaign under a Letter of Agreement signed with IASF–Bologna.  RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page : PL-LFI-PST-TN-0651.0May 200518   IASF/INAF – Sezione di BOLOGNA LFI Project System Team  8 ANNEX 1            RCA_SPR TEST REPORT ON THE 30 GHZ RCA QM Document No.: Issue/Rev. No.: Date: Page : PL-LFI-PST-TN-0651.0May 200519   IASF/INAF – Sezione di BOLOGNA LFI Project System Team          

RCA_SPR Test Report on the 30 GHz RCA QM

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RCA_SPR Test Report on the 30 GHz RCA QM

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