Gayle K. Martin November 14, 2016 FIELDS V5 Thermal iPER Gayle K. Martin November 14, 2016

V5 Thermal Cycling Objectives and Summary Test Objectives Qualify the flight model of the V5 instrument Verify that the V5 unit can bear the temperatures Provide workmanship and performance verification Component temperatures shall be tested to 10°C beyond flight model predicts Test Summary 1 survival and 6 operational thermal cycles will be complete in vacuum CPTs (Electrical Functional Test) will be conducted at the first and last operational cycles at cold and hot temperatures LPTs (same Electrical Functional Test) will be conducted for all other operational cycles

V5 Thermal Cycling Test Configuration Chamber configuration The V5 flight units will be tested in the UCB/SSL SNOUT1 thermal vacuum chamber There are four temperature zones for the TV test Chamber baseplate (heating & cooling) Chamber shroud (heating & cooling) Cold finger (cooling) Mounting plate heater (heating) Hardware configuration The flight unit will be fully assembled Micro-Faze K will be used to electrically isolate V5 from the chamber baseplate There are 2 configurations for the vacuum cycling Survival soaks and V5 warm-up characterization: Cold-finger and mounting plate heater Operational soaks: Remove cold finger and mounting heater, V5 will be hard mounted to chamber baseplate (less thermal mass for op cycling) V5 flight unit in bench test configuration

V5 Thermal Cycling Test Configuration Electrical configuration The harness will be connected to a feedthrough to connect to the V5 GSE external to the chamber The flight instruments will be controlled and internal thermistor monitored via the V5 GSE connected externally to the chamber

V5 Thermal Cycling Test Configuration Thermocouples will be mounted along the flight unit, and harness to verify temperatures during thermal cycling Internal thermistor will verify that the temperatures have stabilized TC # Location Red limit cold (°C) Yellow limit cold (°C) Yellow limit hot (°C) Red limit hot (°C)   Baseplate -200 -140 75 90 Shroud Cold Finger -160 110 120 V5 electronics box, baseplate Heater zone 3 -150 115 V5 electronic box, top -145 -135 V5 mounting plate

V5 Thermal Cycling Test Profile The test duration for the combined thermal cycling test will take ~5 days (assuming 4 hour soaks) including set-up and take-down time Instrument functions Pre-test functional Hot and cold operation CPTs (op cycles 1 and 6) Hot and cold operation LPTs (op cycles 2 through 5) Post-test functional Test parameters The transition rate of the instrument is not to exceed 3°C per minute Start of soak is defined when the control temperature is within 1°C of the test temperature Soak is defined as a minimum of four hour at case temperatures with a change in temperature of ±1°C Temperature profile on following slide Future vacuum testing Additional vacuum exposure will occur on the flight hardware The V5 assembly will “ride-along” with the FIELDS MEP in thermal cycling 6 operational cycles from -25°C to 60°C 1 survival cycle from -30°C to 65°C

V5 Thermal Cycling Test Profile

Back-up

Handling & Contamination Control All test articles and test hardware to be bagged and kept in clean room Personnel are to handle only with appropriate gloves and contamination gowning EMECP specifications shall be practiced during flight hardware handling, test set-up and test operations Contamination control of the instrument must follow the specifications in the SPP-FIELDS Contamination Control Plan 

Test Abort, Real Time Activity Assessment and Success/Failure Criteria Minor anomalies will be evaluated and fixed or alleviated in an attempt to continue testing Examples of minor anomalies include temporary loss of thermocouple, minor problems with hardware (cable movement) or problems with vacuum facility Response to minor anomalies will be made by Test Conductors at test site Significant anomalies will result in abort of further testing The UCB Test Engineer has the authority to stop testing if deemed damage may be occurring to the hardware, the test equipment functioning is suspect, output data is questionable, or test is not compatible with this procedure All anomalies shall be reported as part of standard Project Problem/Failure Reporting. Success/Failure Criteria Adequate temperature data collected at steady state from all test cases Meet all S/C requirements

V5 Other Thermal Testing Completed thermal tests ETU test V5 ETU (EM) underwent a TB test on the APL boom Jan 2016 The thermal model has been correlated to the thermal balance test LN2 “shock test” on preamp Future thermal tests The V5 assembly will “ride-along” with the FIELDS MEP in thermal cycling 6 operational cycles from -25°C to 60°C 1 survival cycle from -30°C to 65°C Thermal balance test on boom during SPP Observatory test estimated 12/2017

V5 EDTRD Thermal Requirements Complete Description 0179   Throughout thermal balance and thermal cycle testing, each instrument subsystem or instrument component shall be powered unless there is an identified potential for damage and a waiver has been obtained from APL 0189 Instruments shall complete a successful thermal vacuum flight qualification testing program prior to delivery to the spacecraft 0190 Testing program shall consist of thermal vacuum balance and thermal vacuum cycle 0191 All instruments thermal test plans shall be provided to the SC thermal engineer for review and approval 0192 Flight predictions shall demonstrate at least 10°C of margin within the instrument operational or survival test temperatures with the exception that for active heater control, 5°C of temperature margin is acceptable at the lower test limit 0207 Instrument thermal vacuum cycle tests do not have to maintain the isolated coupling used during thermal balance. This should decrease transition time between cycles, thus total test time. Instrument component temperatures shall be based on flight model predictions if the isolation coupling is not flight-like 0208 Instrument component temperatures shall be tested to 10°C beyond flight model predictions 0209 Flight model testing shall complete six operational and one survival cycle 0212 CPT’s shall be conducted during instrument level TV testing 0213 Minimal functional tests shall be performed at all remaining plateaus if no CPT performed