lhq status and plan giorgio ambrosio fermilab

1st HiLumi LHC / LARP Collaboration Mtg, Nov. 16, 2011 LHQ Status and Plans – G. Ambrosio 11

LHQ Status and PlanGiorgio Ambrosio

Fermilab

1st HiLumi LHC / LARP Collaboration MeetingCERN

November 16-18, 2011

BNL - FNAL - LBNL - SLAC

LHQ Task Leaders:Coil Fabrication + Instrum & Traces – J. Schmalzle (BNL), R. Bossert (FNAL), … (LBNL)Mechanical Structure & Assembly – H. Felice (LBNL)Test preparation and test – G. Chlachidize (FNAL)


Long QuadrupoleLQS3.7 m long90 mm bore

Long High-Field Quadrupole (LHQ)3.7 m long - 120 mm bore

Magnet Development Chart

Completed

Ongoing

Starting

85%~30%


Length Scale-up Projects in LARP


Long High-Field Quadrupole (LHQ)120 mm bore – Length TBD (3.5-4.5m)


Long High-Field Quadrupole (LHQ)120 mm bore – Length TBD (3.5-4.5m)

SM

TQS

HQ

LR

LQS

LHQ

• From 0.3 m to 4 m• Started in 2005, competed in 2008• Racetrack coils, shell based structure

• From 1 m to 4 m• Started in 2007, exp. completion 2012• 90 mm aperture cos2q coils • Structure alignment

• From 1 m to 4 m• Starting in 2011, exp. completion 2015• 120 mm aperture cos2q coils• Full coil and structure alignment


LHQ Features & Goals• LHQ is the main “Nb3Sn technology demonstrator”

—For technology selection for the LHC IR upgrade—Deadline: 2015

• Aperture: 120 mm (as HQ)• Coil length: 3.4 m (as LQ)• Success criteria:

— Nominal gradient = 80% of SSL based on extracted strands• HQ/LHQ Grad ~ 160/175 T/m (@ 4.2/1.9 K)

— Quenches to nominal gradient: 3— Quenches to 110% of nominal gradient: 10— Quenches to nominal gradient after therm. cycle: 1— Magnetic requirements from HL-LHC Design Study


Conductor• Strand for LHQ01:

— 0.778 mm — OST RRP 108/127

• Jc: > 2650 A/mm2 (4.2K 12T)• Jc: > 1400 A/mm2 (4.2K 15T)• Cu/non_Cu: 1.22• Effective Filament size: ~52 um

• Strand for LHQ02:— OST RRP 108/127, 144/169, 192/217— Effective Filament size: ~52, ~44, ~38 um— Jc may go down with smaller filament size— The US CDP needs feedback now for this choice


Cable and Insulation• Cable:

— With 25 um stainless steel core— See “HQ cable development” by D. Dietderich

• Insulation:— 0.1 mm per side— Braided S2 glass

• Tests in progress with NEEW (optimization of thickness and coverage)


Cross Section

• LHQ X-Section = Revised HQ X-Section— thinner and less wide cable— thicker layer-layer insulation

• 250 um 500 um

• Task force for coil parts adjustments— Goal: more robust design

• ES: replace saddles after heat treatment with insulation-covered saddles

• ES: improve insulation around trace-leads solder joints


Coil Fabrication Technology

• Same coil fabrication technology of revised HQ— winding (Ti-Al-V pole parts)— curing of ceramic binder (CTD 1202)— potting (CTD 101K)— reaction (T = 210, 400, 6xx °C)

• Last plateau temperature depends on strand type

• Long coil features: — gaps among pole pieces (for longitudinal diff. CTE)

• 4 mm/m as in latest HQ coils— Lifting and handling procedures used for LQ coils


Supporting Structure

• Supporting structure:— X-section: LHQ = HQ

• With holes for cooling (TBD) — Scale up-features similar

to LQ• Segmented shell (4)• Al-collars, pads and yoke

made of laminations• Masters and keys 2m long

• Structure with more accelerator features under development in the HQ program


Quench Protection• Analysis performed with QuenchPro and Roxie• Experimental data from HQ (1m) and LQ (4m)

— LHQ can be protected by extracting some energy (R = 40 mW)and using LQ type heaters on coil ID and OD—T peak < 400 K (without quench back)— V max < 1000 V

0

5

10

15

20

25

30

2 4 6 8 10 12 14 16

MIIT

S (A^

2*s*

10^6

)

Quench current (kA)

HQ simulation without PH and 40 mOhm Dump HQ simulation without PH and 30 mOhm dumpHQ01c test without PH HQ01c test with PH (1-4 circuits connected)HQ01b test HQ01d test (all PH circ. Connected)HQ sim. PH150W 26 ms 40 mOhm

Detection and PH delay 10 ms, Rdump delay 10+10 ms

6

8

10

12

14

16

18

20

22

4000 6000 8000 10000 12000 14000 16000 18000 20000

MIIT

S

Current

LHQ-quenchpro - 40 mohm

LHQ - ROXIE - 40 mhm

LHQ-quenchpro-40 mohm-OLPH

LHQ - ROXIE - 40 mOhm - OLPH

"LHQ - ROXIE - 30 mOhm - QP comparison"LHQ - quenchpro - 30 mohm


FNAL structural plate

FOUR SUSPENSION RODS

Test

• Test at FNAL VMTF:— T = 4.6 – 2.3 K

• no superfluid He with present top plate— support similar to HQ test at CERN

— new He recovery line— new warm bore for magnetic

measurements:• 63-68 mm ID


Fabrication and Test Plan• Cable:

— Cabling: LBNL— Insulation: NEEW (or other vendor)

• Coils:— Winding & curing: FNAL— Reaction & potting: BNL, LBNL— Instrumentation: BNL, FNAL, LBNL— Shipment structure (long version of HQ one): BNL

• Structure:— Pre-assembly & magnet assembly: LBNL— Shipment similar to LQ

• Test:— Warm and cold measurements: FNAL


LHQ Schedule

| 2012 | 2013 | 2014 | 2015

Practice coils

Coil test in mirror

Structure develop. & mech. model

LHQ01 coils (5)

LHQ01 assembly & test

LHQ01b assembly & test

LHQ02 coils (5), assembly & test

10 coils, 1 coil test, 3 magnet tests by the middle of 2015


Conclusions

• The LHQ is LARP’s last step for demonstrating Nb3Sn technology for the LHC Luminosity Upgrade

• It builds upon the whole LARP R&D (HQ, LQ, …) with contributions from other programs

• LHQ magnet test results are expected in 2014 - 15

For more Luminosity at the LHC

lhq status and plan giorgio ambrosio fermilab

Documents

larp smtqshqlrlqslhq

lhc design study

lhq features goalslhq

lhc ir upgradedeadline

nominal gradient

um strand

latest hq coils

revised hq xsection