Feather 2 Technology

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,

Feather2 Frather2 former cross section scale 1:1

Feather2 first winding trials 6 Kg winding tension

Hard way bend in cable?

Development winding tooling

Feather2 winding tooling In manufacture ! Due mid January

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

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

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

Quench calculations Feather2 Thanks to Jeroen Van Nugteren

Feather2 inside Fresca2 Quench Thanks to Jeroen Van Nugteren

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

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

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.

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 Voltage tap may be getting a little outdated for HTS Lets see!!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.

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

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

Planning