1. Feather 2 Technology

2. Over view Feather2 Tech Cross section reminder,
Development of Winding and Impregnation tooling,
Quench delays Fresca2 and Feather2
Instrumentation implementation,
A comment on testing in Gas,
Planning,

3. Feather2
Frather2 former cross section scale 1:1

4. Feather2 first winding trials
6 Kg winding tension

5. Hard way bend in cable?

6. Development winding tooling

7. Feather2 winding tooling
In manufacture !
Due mid January

9. Previous existing design concept
Impregnation mould
We are following a
Previous existing design concept

10. Former 3D printing. Material 316L stainless steel Test weld
CERN laser welding
30% reduction in cost
Hollow parts
Laser welding section
max length 218 mm

11. Quench velocity , hot spot, volume quenched Feather 2
300K
Thanks to Jeroen Van Nugteren

12. Quench calculations Feather2
Thanks to Jeroen Van Nugteren

14. Feather2 inside Fresca2 Quench
Thanks to Jeroen Van Nugteren

15. Temperature sensor array quench detection
Iin
Iout V
Ueq
Spot heater
Sensor + Thermal grease

16. Quench analysis Trace to connect sensors
At 4.2 K and 7100 A, the minimum temperature margin is 8.6 K, the lowest margin is there where the field is the most perpendicular to the cable
The blue volumes.
Thanks to : Erkki Härö, Tiina Salmi, Antti Stenvall
CCS temp. sensor

17. HTS Quench DAQ FPGA NI-CompactRIO Channels 224 total
7 modules: 16 differential analogue inputs each
+/- 200 mV till +/- 10 V input range
16 bits
7.8 kS/s per channel
1 module: 32 digital outputs
5 V TTL
7 µs response time
Also available: high speed module
4 differential analogue inputs
1 MS/s, simultaneous sampling
Processor:
667 MHz dual-core ARM
512 MB RAM
1 external GB storage
+ Additional 3 TB Ext.Storage
NI Linux Real-Time OS FPGA:
Xilinx Artix-7
2 M cells
30 cm
A similar system is used by the EL group to capture voltage transients on the electrical network caused by EDF switching, thunderstorms and internal load changes.

18. Quench Detection - Voltage Taps
Mr. Voltage tap may be getting a little outdated for HTS
Lets see!!
Conclusion: quench velocity is very slow , leading to slow development of voltage that are difficult to detect.

19. Quench Detection - Acoustics
At LBNL quench acoustic signals were detected seconds before the LTS conductor quenched.
For HTS investigation this system will be included in the tests
Thanks to Maxim Marchevsky LBNL

20. Cold testing in GAS ! Connecting magnet to current leads?
Test temp 80 He Gas to 5 K!
Current lead heat exchanger
HTS link
Cold testing in GAS !
F2 in Freacs2
Feather zero
In Iron yoke
F-Zero

21. Planning