Team Name: Gekko
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SED Student Experiment Documentation Document ID: RX14_GEKKO_SEDv5-0_2aug13 Mission: REXUS 14 Team Name: Gekko Experiment Title: Measurement of the variation in electric conductivity with altitude Team Name Universit y Student Team Leader: Zsolt Varadi BUTE Team Members: Gábor Balassa BUTE András Futó BUTE Ágnes Gubicza BUTE Adrián Gugyin BUTE Bálint Kollek BUTE Ottó Botond Lőrinczi BUTE Dávid Szabó BUTE Milán Trunk BUTE Version: Issue Date: Document Type: Valid from: 4. 1 09 August 2013 Spec 14 January 20 12 Issued by: Zsolt Váradi, Gábor Balassa, Ottó B. Lőrinczi Approved by: Payload Manager RX14_GEKKO_SEDv5-0_9aug13 - 2 - Change Record Version Date Changed chapters Remarks 0 2008-dec-18 New Version Blank Book 2010 1 2012-feb-16 all PDR 2 2012-jun-14 1.1. 1.3, 1.4.2, 2, 3, CDR 4, 5, 6, 7.1 2-2 2012-jul-19 1.3, 4.2.1, 4.3, 4.4, 4.6, 5.3, 6.1.1 2-3 2012-aug-06 1.4.2, 2.2, 3.1, 3.2, 3.3, 3.4, 4.2, 4.2, 4.5, 4.6, 4.9, 5.2, 5.3, 6, 8 2-4 2012-aug-17 1.1, 3.3, 4.1, 4.4, 4.8, 6, 7.1 3 2012-sep-04 3.1, 4.3, 4.5.2, 5.1 IPR 3-1 2012-oct-01 1.1, 3.1, 3.2, 5.1 3-2 2012-oct-12 4.3, 5.3, 6.1, 6.2, 6.3 4 2012-dec-16 1.1, 2.2, 3.1, 3.2, Pre-Campaign 4.1, 4.3, 4.5, 4.8, 5.1, 5.3, 6.2, 6.3 4-1 2013-apr-16 1.3, 3.1, 3.3, 3.4, 4.2.2, 4.3, 4.5.2, 4.5.3, 4.8, 4.9, 5.1, 5.3, 6.1, 6.3 5 2013-08-04 3.1, 5.2, 7.2, 7.3, Final report 7.4 Abstract: This document includes all relevant information about the Gekko experiment launched in 7 May 2013 on board the REXUS 14 sounding rocket. The scientific background and the objectives are described and the engineering considerations are also discussed. The document contains the detailed mechanical and electrical design of the payload, as well as the project management aspects and the outreach approach of the team. The flight results and the conclusion of the post-flight analysis are also included. Keywords: REXUS, Gerdien condenser, polar region, sounding rocket, ion composition, precision current measurement, Space research RX14_GEKKO_SEDv5-0_9aug13 - 3 - CONTENTS ABSTRACT ............................................................................................................. 5 1 INTRODUCTION ............................................................................................ 6 1.1 Scientific/Technical Background............................................................. 6 1.2 Experiment Objectives ......................................................................... 14 1.3 Experiment Overview ........................................................................... 14 1.4 Team Details ........................................................................................ 16 1.4.1 Contact Point ........................................................................... 16 1.4.2 Team Members ....................................................................... 16 2 EXPERIMENT REQUIREMENTS ................................................................. 18 2.1 Functional Requirements ..................................................................... 18 2.2 Performance requirements ................................................................... 19 2.3 Design Requirements ........................................................................... 20 2.4 Operational Requirements ................................................................... 22 3 PROJECT PLANNING .................................................................................. 23 3.1 Work Breakdown Structure (WBS) ....................................................... 23 3.2 Resources ............................................................................................ 25 3.2.1 Manpower ................................................................................ 25 3.2.2 Budget ..................................................................................... 26 3.2.3 External Support ...................................................................... 26 3.3 Outreach Approach .............................................................................. 27 3.4 Risk Register ........................................................................................ 30 4 EXPERIMENT DESCRIPTION ..................................................................... 32 4.1 Experiment Setup ................................................................................. 32 4.2 Experiment Interfaces .......................................................................... 34 4.2.1 Mechanical .............................................................................. 34 4.2.2 Electrical .................................................................................. 37 4.3 Experiment Components ...................................................................... 40 4.4 Mechanical Design ............................................................................... 43 4.5 Electronics Design ................................................................................ 47 4.5.1 Power Supply Unit ................................................................... 47 4.5.2 Analogue electronic board ....................................................... 50 4.5.3 Digital electronics .................................................................... 54 4.6 Thermal Design .................................................................................... 58 4.7 Power System ...................................................................................... 59 4.8 Software Design ................................................................................... 60 4.9 Ground Support Equipment .................................................................. 65 5 EXPERIMENT VERIFICATION AND TESTING ........................................... 68 5.1 Verification Matrix ................................................................................. 68 RX14_GEKKO_SEDv5-0_9aug13 - 4 - 5.2 Test Plan .............................................................................................. 71 5.3 Test Results ......................................................................................... 77 5.3.1 Mechanical stress and vibration analysis and test ................... 77 5.3.2 Thermal simulation of the condensers ..................................... 89 5.3.3 FEM analysis of airflow ............................................................ 91 5.3.4 Calculations on the effect of roll during flight ........................... 99 5.3.5 Electronics – Board level tests ............................................... 102 5.3.6 System level tests .................................................................. 109 5.3.7 Vacuum test ........................................................................... 111 6 LAUNCH CAMPAIGN PREPARATION ...................................................... 113 6.1 Input for the Campaign / Flight Requirement Plans ............................ 113 6.1.1 Dimensions and mass ........................................................... 113 6.1.2 Safety risks ............................................................................ 113 6.1.3 Electrical interfaces ............................................................... 114 6.1.4 Launch Site Requirements .................................................... 115 6.2 Preparation and Test Activities at Esrange ........................................ 115 6.2.1 Handling of the module .......................................................... 117 6.2.2 HV system description, safe handling .................................... 118 6.3 Timeline for countdown and flight ....................................................... 119 6.4 Post Flight Activities ........................................................................... 120 7 DATA ANALYSIS PLAN ............................................................................. 121 7.1 Data Analysis Plan ............................................................................. 121 7.2 Launch Campaign .............................................................................. 123 7.2.1 Flight preparation activities: ................................................... 123 7.2.2 Failure analysis ...................................................................... 123 7.3 Results ............................................................................................... 134 7.3.1 Technical and scientific results .............................................. 134 7.3.2 Outlook, improvements and recommendations ..................... 134 7.4 Lessons Learned ................................................................................ 135 8 ABBREVIATIONS AND REFERENCES ..................................................... 137 8.1 Abbreviations ..................................................................................... 137 8.2 References ......................................................................................... 139 Appendix A – Experiment Reviews ..................................................................... 141 Appendix B – Outreach and Media Coverage ..................................................... 159 Appendix C – Additional Technical Information ................................................... 160 RX14_GEKKO_SEDv5-0_9aug13 Page 5 ABSTRACT Our scientific objective is to study the ionization of the atmosphere in different altitudes. We want to measure the variations of electric conductivity with altitude by recording the mobility spectrum of positive and negative ions. The measurements will be carried