20160212 RIAmeeting LISAPathfinder · • LIGO just initiated Gravitational Wave Astronomy! •...
Transcript of 20160212 RIAmeeting LISAPathfinder · • LIGO just initiated Gravitational Wave Astronomy! •...
LISA PathfinderSpanish contribution to space-borne gravitational wave detection
Miquel NofrariasInstitut de Ciències de l’Espai (IEEC-CSIC)
M. NofrariasRIA-Spacetec, Madrid 12/02/16
LISA Pathfinder: tracking spacetime
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• LISA Pathfinder aims to test key technologies for gravitational wave detection in space
• The main objective is to achieve a nominal geodesic motion in space: Sa = 3 x 10-14 m/s2/√Hz at f = 1mHz
M. NofrariasRIA-Spacetec, Madrid 12/02/16
LISA Pathfinder: tracking spacetime
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M. NofrariasRIA-Spacetec, Madrid 12/02/16
Spanish contribution
• The Spanish contribution is the Data and Diagnostics Subsystem (DDS)
- Data Management Unit - Temperature sensors, Magnetometers, Radiation Monitor - Heater, Magnetic Coils
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M. NofrariasRIA-Spacetec, Madrid 12/02/16
Spanish contribution
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• Spanish contribution is the Data and Diagnostics Subsystem, led by the Institut de Ciències de l’Espai (IEEC-CSIC). In collaboration with NTE-SENER, UPC, IFAE
Data Management Unit
Commanding and control of LTP subsystems. Single command interface to S/C Provides power supply and Processing to Diagnostics Implements Optical Metrology control loops
Radiation Monitor Thermal diagnostic subsystem Magnetic diagnostic subsystem
2 PIN diodes in telescope conf.Measuring energy deposition for coincidence events
24 sensors (10-5 K/√Hz)16 heatersMonitor and charac. of thermal sensitive locations
4 fluxgate magnetometers (10 nT/√Hz)
2 coils (100 nA/√Hz)Monitor and charac. of test mass magnetic properties
M. NofrariasRIA-Spacetec, Madrid 12/02/16
Spanish contribution: diagnostics science lead
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Leading Diagnostics Working Group: Experiment definition and data analysis pipeline development
M. NofrariasRIA-Spacetec, Madrid 12/02/16
Data Management Unit
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• Functionality: - Provides single command and control
interface to S/C (except TM att. contrl.)
- Generation and distribution of LTP master clock and sync. signals.
- Commanding and control of LTP subsystems: IS FEE SAU, IS CCU, UVLU, OMS PM, OMS LA.
- Monitors essential LTP HK data
- Provides power supply to DI, processing DI data
M. NofrariasRIA-Spacetec, Madrid 12/02/16
Data Management Unit
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• Hardware: - 24MHz CPU, working at 12MHz - 64k x 8bit PROM (boot loader) - 256k x 32bit EEPROM (pers. data) - 512k x 40bit RAM runtime - 2 MIL-STD-1553 bus interface - 3 serial port
• Software: - ECSS-E40-Part 1B standard codification - 406646 LOC (C99, Python, Assembler) - 4.7 lines of test per LOC - Real-time embedded RTems for ASW
• Software Verification Facility (SVF): - DMU simulator, LTP subsystem emulator
- Functional tests
M. NofrariasRIA-Spacetec, Madrid 12/02/16
Radiation monitor
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• LPF radiation monitor - 2 silicon PIN diodes - Telescope configuration
(red. 10% angular acceptance) - Copper shield stopping protons
E < 70 MeV - FEE determines:
• single-events • energy deposition for
coincidence events
• Achieved performance: - Max. count rate > 6300 p/s (req. 5000 p/s) - Energy spectrum [0-5]Mev , ∆E = 5KeV
M. NofrariasRIA-Spacetec, Madrid 12/02/16
Magnetic diagnostic subsystem
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• Aim: study magnetic coupling of free-falling test masses to the environment • mapping the magnetic field on-board
SB ≤ 10-8 T/Hz1/2 , 10-3 < f < 10-1 Hz
• induce controlled perturbations SI ≤ 10-7 A/Hz1/2 , 10-3 < f < 10-1 Hz
• Experiment: induce magnetic modulations of ~5uT on test mass. Resulting force on the test mass ~ pN
M. NofrariasRIA-Spacetec, Madrid 12/02/16
Thermal diagnostics subsystem
• 24 high precision sensors located in the most temperature-sensitive locations
• 14 heaters to apply controlled perturbations in these locations
• Achieved unprecedented sensitivity: ST= 10-5 K/√Hz at f = 1mHz
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M. NofrariasRIA-Spacetec, Madrid 12/02/16
Noise characterisation experiments: thermal
• Aim: study thermal coupling of free-falling test masses to the environment
• Experiment: induce control modulations of ~40mK across the housing. Resulting force on the test mass ~2pN
- provides pressures estimate on-board
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M. NofrariasRIA-Spacetec, Madrid 12/02/16
Noise characterisation experiments: thermo-elastic
• Thermo-elastic studies planned during in-flight operations, but already took place on ground (Nov. 11)
- F. Gibert et al. Thermo-elastic induced phase noise in the LISA Pathfinder spacecraft CQG 045014 (2015)
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• Derived this contribution to be 1 pm√Hz at 1mHz
M. NofrariasRIA-Spacetec, Madrid 12/02/16
Chronology
2015 Dec. 3: Lift off from French Guiana (Vega VV06 flight)
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2015 Dec. 3-13: LEOP, apogee raising manoeuvres
2016 Jan. 2: Colloidal thruster commissioning
2016 Jan. 11: DMU switch on, diagnostics
check-out
2016 Jan. 13: Laser switches on
2016 Jan. 22: Propulsion module separation
2016 Feb. 3: Handover to Grabbing, Position
and Release mechanism
2016 Jan. 15-16: Test mass release
Steps forward
M. NofrariasRIA-Spacetec, Madrid 12/02/16
Steps forwards #1: magnetic sensing
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• Implemented in 3Cat-2 CubeSat as technology demonstrator (launch 2016)
- AMR-based magnetic diagnostic on-board - Raising TRL level - Reaching stringent size and power reqs. - Testing low-frequency noise behaviour in space
• New magnetic sensing: from fluxgate to Anisotropic Magneto-resistors (AMR)
- Less bulky, reducing back-action
M. NofrariasRIA-Spacetec, Madrid 12/02/16
Steps forwards #2: Ultra-stable optical metrology
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• Aim: develop an infrastructure to test GW technologies at low frequencies
• Funded by Marie Curie CIG Grant (2011-15)
• Main objectives:
- Implement a low-frequency stabilised thermal environment (10-4 Hz)
- Implement a basic interferometer, based in deep phase modulation scheme
- Combine both to test key technologies at very low frequencies: materials, optoelectronics, etc.
Frequency [Hz]
Am
plitu
de s
pect
rum
den
sity
[m/H
z1/2 ]
10−5 10−4 10−3 10−210−12
10−11
10−10
10−9
10−8
10−7
10−6
10−5
10−4
Ifo.1st Pred.1st Subt.2nd Pred.2nd Subt.
M Nofrarias et al. Phys. Rev. D 87, 102003 (2013)
M. NofrariasRIA-Spacetec, Madrid 12/02/16
Steps forwards #2: Ultra-stable optical metrology
• Developing acquired know-how with LISA Pathfinder
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Metrology: deep-phase modulation Mach-Zehnder laser interferometer.
Thermal: stabilised vacuum chamber. Design of a passive thermal insulation to suppress low-frequency
Software: phasemeter implemented as embedded LEON3 soft-core CPU in FPGA
M. NofrariasRIA-Spacetec, Madrid 12/02/16
Steps forwards #2: Ultra-stable optical metrology
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Jan. 2013
May 2014 Oct. 2014
May 2015 Dec. 2015
M. NofrariasRIA-Spacetec, Madrid 12/02/16
Steps forwards #3: High precision temperature sensors
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• ComFuturo: private funded grants to young scientist to develop their projects (3yr) in a CSIC institution. Managed by Fundación General CSIC
• First edition 2015, 14 awards in Spain: • High precision sensors for temperature control in
space missions (M. Nofrarias)
• Aim: design a temperature sensor based in opto-mechanical resonators reaching ~nK/√Hz. Miniaturise technology to test in flight conditions (TRL6)
• Compact, non-magnetic, high precision
M. NofrariasRIA-Spacetec, Madrid 12/02/16
Conclusions
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• LIGO just initiated Gravitational Wave Astronomy! • LISA Pathfinder is already flying, commissioning ongoing
- Test mass release planned for 15-16th Feb- Science operations planned for 1st March
• Spanish contributions is the Data and Diagnostics subsystem with important impact in science
• We keep pushing ultra-stable technologies (~𝜇Hz) forward to support a future space-borne GW observatory
- Thermal- Magnetics- Metrology