1 st HiLumi LHC/LARP Collaboration Meeting 18 November 2011

1st HiLumi LHC/LARP Collaboration Meeting

18 November 2011

Cold Powering and Superconducting Links

A. Ballarino, CERN

Cold Powering of LHC low- triplets

Remote powering via superconducting links

Development at CERN of HTS superconducting lines

WP6 of the Hi-Lumi Collaborative Project

Conclusions

A. Ballarino, 18 Nov. 2011

Outline

Hi-Lumi upgrade:

Reduce * by stronger and larger aperture quadrupole magnets located near thecollision points (low- triplet quadrupoles). Increase of Bp that can be transformed inhigher quadrupole gradient or/and larger bore diameter

Nb3SnIop = 15 200 ABp = 11.9 TGradient = 171 T/m


Cold powering system:

Provide an “efficient” electrical transfer from the power converters, at room temperature, tomagnets. It’s a cryogenic and electrical system that incorporates superconducting components



SCHEMATIC LAYOUT OF THE low- TRIPLET

Distances in m

MQXA


IP1

Q3,Q2,Q1DFBXD1Q4,D2Q5Q6

DFBL

DFBAQ11, Q10…Q7

IP 8

TASTAN

4.5 K 4.5 K 1.9 K

12 m 3 m

3.6 m

UJ 13RR 13

Layout at Point 1


POWERING CONFIGURATION OF THE TODAY LHC INNER TRIPLETS

Nested circuits One trim power converter on Q1

D1 at P1 and P5: resistive magnetQ1, Q2 and Q3: four leads, each rated at 7500 A DC Corrector magnets: quadrupole, sextupole octupole (120 A/600 A)

DFBXA and DFBXB at P1DFBXE and DFBXF at P5

N. of leads Rating (A)

10 120

14 600

4 7500

Itot 40 kA


F. Bordy et al.

POWERING CONFIGURATION OF THE HIGH LUMINOSITY –NEW- INNER TRIPLETS

D1 at P1 and P5: resistive magnetQ1, Q2 and Q3: four leads, each rated at 7500 A

Corrector magnets: 120 A (dipole) and 600 A (sextupole)

resistive magnet superconducting magnet, I 10 kA four leads, each rated at 7500 A eight to four leads, each rated up to 15 kA

Individual powering of each circuit ?

Nested powering, e.g. one main power converter plus current trimming on each magnet ?

Split powering, e.g. Q1 in series with Q2a and Q3 in series with Q2b ?

Need for energy extraction via warm resistors of each individual magnet, i.e. need for safety leads and additional superconducting cables in the cold bus ?

Time constant of the circuits and amount of stabilizer in the cables ?

Itot 40 kA 40 kA > 100 kA


IP1

Q3,Q2,Q1DFBXD1Q4,D2Q5Q6

DFBL

DFBAQ11, Q10…Q7

IP 8

TASTAN

4.5 K 4.5 K 1.9 K

12 m 3 m

3.6 m

UJ 13RR 13

Layout at Point 1


I I

Room temperature

Cryogenic environment(4.5 K LHe in the DFBs)

Tunnel

Cold powering system:

1) Current leads in a distribution cryostat (near the power converters);2) Vertical electrical transfer (link);3)Horizontal electrical transfer (link);4) Cryogenic fluid supply and control;5) Interconnection to the magnets bus system;6) Protection of link and current leads.

PM 15

PM 54DFBXF (UJ56)DFBXE (RZ54)

DFBXA (UJ13)

DFBXB (UJ16)


2100 kA


New shaft for SC LinkHeight ~85 meter

Y. Muttoni J.P. Corso

Point 5



Free space in the beam areas; Safer long-term operation of powering equipment located in radiation-free environment; Safer and easier access of personnel to power converters, leads and control equipment; Reduced time of interventions (maintenance, repair, diagnostic and routine tests) → Gain in machine availability

Powering via Superconducting Links

MgB2 Tape : 3.640.65 mm2

MgB2 : 12 %Cu : 15 %

MgB2

YBCO

YBCO Tape : 4 0.1 mm2

YBCO: 1-3 mCu : 220 m

Bi-2223Bi-2223 Tape : 4.5 0.4 mm2

BSCCO: 23 %Cu : 250 m


Conductors in Superconducting Links

0

20

40

60

80

100

120

Nb-Ti Nb3Sn MgB2 Y-123 Bi-2223

Criti

cal T

empe

ratu

re

Conductor

Ic(77 K, self field) 100 A

YBCO

MgB2


Conductors in Superconducting Links


Nb-Ti cablesused in LHC 6 kA at 6 K

MgB2 cable6 kA at 20 K(> 12 kA at 4.5 K)

6 mm

Minimum quench energy of superconductors

Nb-Ti, Top = 5 KTc= 6 K → MQE = 2.63 mJ/cm3

Tc = 7 K → MQE = 5.26 mJ/cm3

Tc = critical temperatureTop = operating temperatureMQE= Minimum Quench Energy

20 K-50 K


Cryogenics for Cold Powering System

Tunnel

Where else in the LHC ?

P1

P7

P5P5


P7 Underground Installation

Current Leads andPower Converters

~ 250 m

~ 250 m

Option also for P3

48 cables rated at 600 A per linkTwo links each about 500 m long


http://kosmicki.home.cern.ch/kosmicki/new-photos/point7/us76/us76.htm


S.Weisz, J. Osborne

What do we have today ?

= 40

25 × 2 × 600 A (2 × 15 kA) @ 35 K MgB2

@ 65 K (YBCO and Bi-2223)

~2 kg/m

~ 200 mHTS/mcable


CERN Prototype Link

Link for Point 7


MgB2

Bi-2223

YBCO

600 A

Test of 600 A HTS Cables

Measurements @ Southampton University (gas cooling) and CERN (liquid heliumand liquid nitrogen). Length of HTS cables 2 m

Proceedings of EUCAS 2011

MgB2

YBCOBi-2223

MgB2

Bi-2223

YBCO

600 ATop

15 K55 K


Test of CERN 600 A HTS Cables

(CERN measurements)

(SOTON measurements)

Proceedings of EUCAS 2011


R=1.5 m

Cryostat for Link (20 m length) in SM-18

Semi-flexible linein SM-18 test station


Cryostat for Link (20 m length) in SM-18

= 75

= 15.5

3 × 6 kA

27 cables 6000 A48 cables 600 AItot = 190 kA @ 20 K (2 × 95 kA)~5 kV

~10 kg/m

~ 900 mHTS/mcable

=70

24 × 6000 A42 × 600 AItot = 169 kA & 20 K ( 2 × 84.5 kA) 5 kV

A. Ballarino, Proceedings of ASC 2010


MgB2 round wire

YBCO tape

High-current cable configurations

Φ = 62 mm

7 × 14 kA, 7 × 3 kA and 8 × 0.6 kA cables – Itot120 kA @ 30 K


MgB2 round wire

High-current cable configurations

Development of round wire at Columbus Superconductors

CHALLENGES


Significant/unprecedented vertical transfer ( 100 m)Need for reinforcement of cables (10 kg/m 1000 kg)Need for appropriate compensation of thermal contraction in the straightvertical part

Complex system to be integrated in the LHC machine

Significant/unprecedented high-current long HTS cables (up to 15 kA)

Complex multi-cable assembly

Work Package 6

Task 1Coordination

Task 2Cryogenics

Task 3Electr. Transf.

Cryostat

Task 4Energy Dep.

Material

Accelerator Physics and Performance

Collimators

WP 6, CERN A. Ballarino

Fluka team

Magnet Design

Crab cavities

A. BallarinoF. Broggi(CERN,INFN)

U. Wagner(CERN)

Y. Yang(Univ.South.)

F. Broggi(INFN)

Task 1Coordination

CERN/INFN

Task 2Cryogenics

CERN

Task 3Electr. Transf.

CryostatUniv. South

Task 4Energy Dep.

MaterialINFN

Hi-Lumi FP7 WP6Design study

CERN activityDesign study

Integration

Civil engineering

Interfaces(mech, vacuum, electr)

Vacuum

SC cables/SC link

Cryostat of SC link

Current leads

Protection

CERN activity

- Prototypes construction- Cryostat- Prototypes test

- System design- Series specification- Series construction- Integration- Operation

OVERVIEW OF GLOBAL ACTIVITY

Fluka team

2012 20202018

HTS Links in LHCP1, P5,P7

HTS Links in LHC Hi-LumiP1 and P5

Timeline

2012-2013 2018-2019 2020-2021

Test ofhorizontallinks

2014

Test ofverticallinks

Civil Engineering

Superconductor

System production


L. Rossi, Hi-Lumi LHC Design study


Integration of CERN HTS Prototype Link (5 m) in cryostat @ SOTON

Successful test of 5 m long CERN prototype link (50 cables rated @ 600 A) He gas @ 30 K


Thanks for your attention

Documents

1 st HiLumi LHC/LARP Collaboration Meeting 18 November 2011