a. ballarinolasa, milano,18/09/2012 high-tc superconducting link status of task 7.5 fp7 meeting at...

A. Ballarino LASA, Milano,18/09/2012

High-Tc Superconducting LinkStatus of Task 7.5

FP7 Meeting at LASA-Milano

A. Ballarino, CERN

for the Task 7.5 Collaboration

CERN, Bruker, Columbus, University of Southampton

LASA, 18-09-2012


Outline

• Task description

• Cable concept

• Progress since last meeting (April 2012):• Cabling machines• Test station

• Status of activity vs final deliverable

• Conclusions


Task 7.5: High-Tc link

Deliverable of Task 5 - as described in the Eucard Grant Agreement:

Superconducting link, 20 m long, containing 48 HTS cables rated at 600 A - DC .The Task includes design and assembly activities – but not the test of the final prototype

The final application for LHC (P7) consists of two superconducting links, each about 500 m long, with the same configuration of the prototype

CERN will test the 20 m long prototype in nominal operating conditions


Cable concept

Elaboration of a cable concept that enables the use of pre-reacted superconductors available in the form of tape:

MgB2, YBCO and BSCCO 2223

The HTS cable design adopted for power transmission lines appeared not to be suitable for this specific application - few tapes and many cables in the same cryogenic envelope


+ 600 A

- 600 A

Three HTS tapes per cable interleaved with copper strips

+ 600 A

- 600 A

4 mm

1 m

m

Cable Concept


Cable/Link Concept (2/2)

24 × 2 × 600 A

Multi-cable assembly Link: multi-cable assembly in cryostat

~2 kg/m~ 200 mHTS/mcable


Prototype twisted-pair cables characterization(CERN and SOTON)

Type-5: MgB2Type-3: Y-123Type-2: Bi-2223Type-1: Bi-2223

NB The Ic in the plot refers to one single cable of the twisted pair unit

Measurement performed on twisted-pair cables made from different conductors

No cabling degradation observed (< 2 %)

Good homogeneity of Ic of cables in the same in the same twisted pair (~ 2 %)

Self-field, Length of cables = 2 m

2×4.4 kA !


Cabling machine (1/2)

For the controlled assembly of long cables a dedicated cabling machine hasbeen designed, assembled and fully commissioned at CERN


Cabling machine (2/2)

Rotating machine for the twisting of insulated cables

Design and assembly completed. To be commissioned in October 2012.


Test station

LHe

GHe

20 kA

L = 20 m inner = 64 mmouter = 163 mm


Test Station – SM 18 CERN laboratory

Refrigerator: 6 kW @ 4.5 K(18 kW for test of LHC magnets) 25 000 LHe Dewar


Test Station @ CERN: Conceptual DesignRT

Cryostat with current leads

Cryostat with superconducting cables


Test Station @ CERN: Conceptual DesignRT

LHe

4.5 K

GHe

Tv m ≤ 10 g/s 5 K ≤ Tv ≤ 70 K

Vacuum Insulation

LHe, 4.5 K GHe

Instrumentation DAQQuench Protection


Test Station @ CERN


Test station at CERN

The two cryostats are fully assembled

The cryostat with the leads has been commissioned – pressure and leak tested, cooled-down to nominal conditions, operated at some 3.5 kA and warmed up

The cryostat of the superconducting link was successfully leak tested last week, and it will be pressure tested this week

The connection of the two cryostats is planned to take place this month.

A first cool-down, with a 20 m long twisted pair YBCO cable already integrated the in cryostat of the superconducting link, is planned to take place in October 2012


Status of activity vs final deliverable

The 20 m long semi-flexible cryostat with a supporting system and purpose-built terminations, is available today at CERN

A 20 m long 48 HTS cable assembly can be ready by end 2012 – when also the rotating cabling machine will have been commissioned

This two components make the superconducting link which is the deliverable of the Task 7.5

In addition:

By the end of the year, the test station will have been fully commissioned and 20 m long cables will have been tested in He gas in a variable temperature range. The test of a 20 m long prototype will follow


Is the Task 7.5 on schedule ? Yes

Assembly of prototype link: planned to be ready by end 2012.


Conclusions

A new cable concept has been proposed. Validation of the proposed twisted-pair concept was done with the assembly and characterization of short prototype MgB2, YBCO and BSCCO 2223 cables

Two cabling machines have been designed and constructed for the controlled cabling of the 20 m long HTS twisted-pair cables

A new test station has been constructed at CERN for the test of the 20 m long prototype link

The task is on schedule – a full prototype is planned to be available by end 2012. The test in nominal operating conditions will follow. Single twisted-pair cables, 20 m long, will be measured this year


Thanks for your attention !

a. ballarinolasa, milano,18/09/2012 high-tc superconducting link status of task 7.5 fp7 meeting at...

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