ESA Space Cryogenics Workshop 2015

LPT6510
ESA SPACE CRYOGENICS WORKSHOP 2015
R. ARTS[1], J. MULLIÉ[1], J. TANCHON[2], T. TROLLIER[2]
[1] THALES CRYOGENICS B.V., THE NETHERLANDS
[2] ABSOLUT SYSTEM, FRANCE
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Outline
2
▌ Background
▌ Design choices
Integral concept
Compact solution for phase shifter
▌ Demonstrator unit
Design
Test campaign
▌ Design and Process Heritage
▌ Datasheet overview
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Background
3
▌ Continuing demand for pulse-tube cryocoolers for >60 K operating regime
Orbital Carbon Observatory (OCO-3): High heat load at 110 K, 40 C reject
SWIR applications ≥150 K, provided cost-effective, compact and efficient
▌ In USA, tactical build standard cryocoolers considered:
E.g. “Flight Qualification Testing of the Thales LPT9510 Pulse Tube Cooler”, ICC
2014 (JPL)
▌ Thales and Absolut decided to partner to make an off-the-shelf product
Building blocks available to meet requirement
Development started, self-funded by both companies
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Background
4
▌ Existing building blocks available
Thales Cryogenics MPTC compressor, developed under ESA TRP
14896/00/NL/PA
Thales Cryogenics LPTC compressor, developed under ESA TRP
18433/04/NL/JA and mature in the frame of EU space programs
Absolut System SSC80 Pulse-tube Cold Finger, initially developed
for use with modified Thales LSF91xx off-the-shelf compressor
(IPAG Astronomy application, APD detector)
▌ Tested with available Electronics (Thales COTS products, Iris
Technology HP-LCCE)
▌ Objective to provide COTS-SPACE cryocoolers in the 40K-
150K temperature range
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Design choices – Optimize for integration
5
▌ Integral coolers principle
Single interface for efficient integration & heat sinking
Suppression of transfer line for performance optimization
Compactness
Modular design - split configuration available on request
LPT6510 integral cooler
3W@100K range
▌ Novel phase shifter concept under test: improved compactness,
interfaces
▌ Baseline concept to be tailored for projects in the near future
Off-the-Shelf LPT6510 with 1-3W of cooling capacity in 80-110K range
Project-specific variants
Other products with available building blocks (30-50K (w/CEA), single-stage, …)
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part or disclosed to a third party without the prior written consent of Thales - © Thales 2015 All rights reserved.
Integrated phase shifter concept
6
▌ Trade-off study performed
Clear advantage on mass, volume & integration
▌ Initial tests and development performed by Absolut and Thales
Tested with Thales LSF91xx compressor and modified LPT9510 pulse-tube
Tested with LPT6510 compressor and Absolut SSC80 pulse-tube
▌ Risks identified
Performance
Performance stability
test campaign ongoing
Induced vibrations tests ongoing, AVR to mitigate
▌ … Preliminary tests very successful!
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Ongoing design effort focusing on LPT6510
7
▌ Optimize for 110 K working point (OCO-3)
Maximize efficiency @ 110K
Heat lift of 3W @ 110 K
Keep mass low
▌ Validate advantages of integral design
▌ Verify novel phase shifter concept
▌ Adapt building blocks to design choices
▌ Move towards flight standard
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Current status – Demonstrator unit built
8
▌ Demonstrator unit built
Based on existing building blocks
Clear advantage of integral concept
- No transfer line
- Good thermal contact to hot side of cold finger
▌ Novel phase shifter design already incorporated
in breadboard
Breadboard
▌ Flight unit concept
Optimized interfaces and mass (<3kg)
Same novel concept for phase shifter
Artist impression final system
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Test results – Performance map (1)
9
Test set-up
@ Absolut System
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Test results – Performance map (2)
10
Test set-up
@ Thales Cryo
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Test results – Thermal coupling of warm end through compressor
11
Test performed on breadboard system
Insulation placed around compressor
and warm end of Pulse-tube cold
finger
All reject heat through base plate
∆T between warm end and baseplate
measured as function of input power:
<5 K at 45 W input to the cooler
Further improvement expected in final
design
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Test results – Warmup
12
Parasitic heat load measured
Multi-slope Warmup method1
MLI around pulse-tube
Conduction losses dominant
Total measured losses:
2.57 mW/K
1“Multi-slope
warm-up calorimetry of Integrated Dewar-Detector Assemblies”,
A. Veprik, Proc. SPIE 9451, Infrared Technology and Applications XLI, 945122
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Test results – Exported vibrations
13
z
x
y
(Off-axis in the 100 mN range)
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Test results – Exported vibrations
14
z
x
y
Corporate Communications - March 2015
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part or disclosed to a third party without the prior written consent of Thales - © Thales 2015 All rights reserved.
Iris Drive Electronics
15
▌ Iris Technology Electronics
HP-LCCE brassboard version tested
Functionally representative for flight hardware
Designed for AC power up to 200 W
RS-422 control and telemetry
Active vibration reduction (5 harmonics)
▌ HP-LCCE Hardware courtesy of Iris Technology
First functional check OK, cooler driven open-loop
Further tests are ongoing
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part or disclosed to a third party without the prior written consent of Thales - © Thales 2015 All rights reserved.
Processes and Heritage
16
▌ Base compressor design very similar to LPTC compressor, which is a
mature concept (several EU space programs)
EB welding and laser welding
Aluminium centre part
TA6V motor shell
▌ Current (compressor) build standard based on original MPTC TRP
▌ Design to be updated towards flight standard
Lessons learned from LPTC compressor to be incorporated
Motor coils
Potting material
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Reliability Heritage
17
▌ Flexure-bearing compressor has been the workhorse of Thales products
▌ LSF9330 Flexure Bearing Stirling cooler
CryoSystem project (2002)
4 units in life time testing (2 COTS, 2 Cryosystem)
>10 years of continuous ON time per cooler
Coolers remain within specification
▌ LPT9310 Pulse-tube cooler
>1100 delivered for 24/7 operation (commercial application)
32.8 * 106 hours of operation (accumulated)1
▌ Thales flexure bearing design has a lab- and field-proven reliability
1
“State-of-the art cryocooler solutions for HPGe detectors”, J. Douwen, Canberra Industries
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Outlook
18
▌ Verification, validation and optimization
Further verification on novel phase shifter concept
Optimization baseline working points based on market feedback
Verification and validation with AVR CDE (TCbv & Iris Technology)
▌ Finalize baseline product definition based on market feedback
▌ Thales Cryogenics partners with Absolut System to bring product to market
Thales Cryogenics as prime for the cryocooler
Baseline “off-the-shelf” version
Project-specific variants
Building blocks for future products (e.g. 30-50K, single-stage)
▌We welcome your feedback!
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Corporate Communications - March 2015
This document may not be reproduced, modified, adapted, published, translated, in any way, in whole or in
part or disclosed to a third party without the prior written consent of Thales - © Thales 2015 All rights reserved.
Thank you for your attention
19
Come see the LPT6510
demonstrator during break!
Questions?
Corporate Communications - March 2015
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