Date post: | 13-Dec-2015 |
Category: |
Documents |
Upload: | meagan-bradford |
View: | 219 times |
Download: | 1 times |
LARP Magnets
• FNAL contribution to LARP (LHC Accelerator Research Program)
• FNAL core-program support to LARP
DOE Annual Program Review - May 16-18, 2006
Giorgio Ambrosiofor the High Field Magnet group
LARP Magnets - G. Ambrosio 2DOE Annual Program Review, May 16-18, 2006
SC Magnet R&D at Fermilab
• Fermilab has a long (~30 years) and successful history of SC accelerator magnet R&D– Tevatron, Low Beta Quads, SSC dipoles, VLHC superferric
transmission-line, LHC IR Quads, HFM dipoles
• This is because SC magnets are an enabling technology for high energy accelerators
“The tremendous accomplishments of these last two years confirm the broad strength of the group”
“In many areas basic elements of the Fermilab program, such as tests of material, establishment of fabrication processes, design and fabrication of tooling and fixtures, are essential to LARP success”
Jan 06 - High Field Magnet review (L. Rossi, chair)
LARP Magnets - G. Ambrosio 3DOE Annual Program Review, May 16-18, 2006
LARP 2009 Milestone
The LHC Accelerator Research Program (LARP) has a very challenging milestone at the end of 2009
“Demonstrate that Nb3Sn magnets are a viable choice for an LHC IR upgrade”
1.
Technological Quadrupoles (TQ) for performance reproducibility
1 m long, 90 mm aperture, Gnom > 200 T/m, Bcoil > 12 T
Long Racetracks and quadrupoles (LQ) addressing long magnet issues
LQs have same features of TQs 4 m long
High gradient quadrupoles (HQ) to explore performance limits
1 m long, 90 mm aperture, Gnom > 250 T/m, Bcoil > 15 T
Milestone set in agreement with CERN
LARP Magnets - G. Ambrosio 4DOE Annual Program Review, May 16-18, 2006
LARP 2009 Milestone
The LHC Accelerator Research Program (LARP) has a very challenging milestone at the end of 2009
“Demonstrate that Nb3Sn magnets are a viable choice for an LHC IR upgrade”
1.
Technological Quadrupoles (TQ) for performance reproducibility
1 m long, 90 mm aperture, Gnom > 200 T/m, Bcoil > 12 T
Long Racetracks and quadrupoles (LQ) addressing long magnet issues
LQs have same features of TQs 4 m long
High gradient quadrupoles (HQ) to explore performance limits
1 m long, 90 mm aperture, Gnom > 250 T/m, Bcoil > 15 T
Milestone set in agreement with CERN
FNAL: Host lab for TQCs
FNAL: TQS coil winding & curing
FNAL: L2 coordination
FNAL: Design Study L2 coordination
FNAL: Host lab for LQsFNAL: Design
Study task leader
FNAL: Contribution to all WGsStrand study task leaderMagnet test coordination leaderOnly lab for 1.9K magnet test
LARP Magnets - G. Ambrosio 5DOE Annual Program Review, May 16-18, 2006
Technological Quadrupoles
Two mechanical designs are under developmentSame coils / Aperture = 90 mm / Gradient > 200 T/m @ 4.2K
2 layers
FillerKeys
4 pads
Bladder
Yoke
Aluminum shell
YokeGap
PreloadShim
ControlSpacer
Skin
Collar
YokeCollaringKey
Stress Relief Slotin inner pole
TQC: using collarsCollar laminations from LHC-IR quads1st time applied to Nb3Sn coils
TQS: using Al-shellPre-loaded by bladders and keys1st time applied to shell-type coils
LARP Magnets - G. Ambrosio 6DOE Annual Program Review, May 16-18, 2006
TQ Coil Fabrication
• TQ coil fabrication technology is based on FNAL techn.
Water Jet Machined Part
Ceramic binder for insulation, water-jet technology for end-parts, reaction procedure with azimuthal and pole gaps, segmented tooling with “gentle-transfer” procedure, splice design and procedure
• All coils for the 1st magnet series have been wound and cured at FNAL, reacted and impregnated at LBNL
LARP Magnets - G. Ambrosio 7DOE Annual Program Review, May 16-18, 2006
TQC Design and Analysis
• FNAL has developed TQC design, and performed 2D and 3D magnetic and mechanical analysis
Coil stress < 150 MPa at all stages
3D magnetic analysis for ends and yoke optimization
3D mechanical analysis for end pre-load optimization:
1st time use of ANSYS birth-and-death capabilities to track epoxy crack propagation
LARP Magnets - G. Ambrosio 8DOE Annual Program Review, May 16-18, 2006
TQC Mechanical Models
• Four mechanical models have been assembled and tested at FNAL in order to develop collaring procedure for Nb3Sn coils and check all fabrication steps
Stress in different longitudinal sections of the model during keys insertion:
Stresses are uniform within +/- 5 MPa during all process
free
5 m
m (
blo
ck 1
)
5 m
m (
blo
ck 2
)
5 m
m (
blo
ck 3
)
5 m
m (
blo
ck 4
)
7 m
m (
blo
ck 1
)
7 m
m (
blo
ck 2
)
7 m
m (
blo
ck 3
)
7 m
m (
blo
ck 4
)
9 m
m (
blo
ck 1
)
9 m
m (
blo
ck 2
)
9 m
m (
blo
ck 3
)
9 m
m (
blo
ck 4
)
9.3
mm
all
blo
cks
-80
-70
-60
-50
-40
-30
-20
-10
0
Key travel
LARP Magnets - G. Ambrosio 9DOE Annual Program Review, May 16-18, 2006
TQs Status and Plans
1st TQC “with collars”:– Coils are ready
– Assembly planned to start in mid of May
– Test planned in July
1st TQS “with Al-shell”:– Tested at LBNL in April
– Training started at 80% ssl
– Reached G = 190 T/m
– ~87% ssl or even more, analysis is in progress
TQS01 training history
Numbers on top show coil where quench started
LARP Magnets - G. Ambrosio 10DOE Annual Program Review, May 16-18, 2006
Plan for Length Scale-Up
LENGTH SCALE-UP CHALLENGE: No Nb3Sn accelerator magnet longer than 1m has ever been builtLARP should make a successful 4m long quadrupole by end of 09
FNAL Long MirrorsFNAL
LARP Long Quadrupoles
FNAL, LBNL, BNL
LARP LQ Design Study
LARP Long RacetracksBNL, LBNL, FNAL 2006
2007
2008
2009
LARP Magnets - G. Ambrosio 11DOE Annual Program Review, May 16-18, 2006
LARP Long Racetrack
The goals of the Long Racetrack (LR) are: to fabricate and test long Nb3Sn racetrack coils Performed at BNLto test an Al-shell-based supporting structure (preloaded using bladders and keys)
Developed at LBNLFNAL contributions:
L2 coordination of Supporting R&D (G. Ambrosio)FNAL scientists and engineers are part of LR working groupSub-task: technology transfer from the LR to the LQ involves FNAL engineers and technicians
Coil layout: two flat double-layer racetrack coilsTechnology successfully developed at LBNL, successfully modified at FNAL, transfer to BNL in progress
From 0.3 m to 3.6 m
LARP Magnets - G. Ambrosio 12DOE Annual Program Review, May 16-18, 2006
FNAL Long Mirror
• FNAL “Mirror magnet” is a cos-theta dipole where a coil is substituted by iron blocks
• Plan: 2m – 4m mirror magnets
Front view of mirror magnet
The plan is to base the scale-up on a well understood design and fabrication technology
FNAL successfully fabricated 3 dipoles and 1 mirror magnet
ADVANTAGES - Larger probability of success of the LQ by:Several features complementary to LRs Diversity & Risk mitigation
- conductor, keystoned cable, insulation, coil shape, use of wedges, mechanical structure,
Start as soon as possible development and qualification of tooling and infrastructure for long magnets at FNAL (New 6-m long oven, …)
LARP Magnets - G. Ambrosio 13DOE Annual Program Review, May 16-18, 2006
Other parts of SC magnet R&D
• FNAL has a major role in Design Studies: – LARP L2 coordinator (Zlobin) – LARP Long Quadrupole DS task leader (Ambrosio)– several scientists involved in different designs (inside and outside LARP)
• … also in Material R&D:– Strand R&D task leader (Barzi)– Tests of strands and cables with different
materials, in different conditions (pressure, field, temperatures)
• … also in Magnet testing:– LARP magnet integration coordinator
(Feher)– Only LARP lab with 1.9K capability– Developed low-noise high-frequency spike
detection system
Tests of SQ02 (small quadrupole with racetrack coils) fabricated at LBNL
LARP Magnets - G. Ambrosio 14DOE Annual Program Review, May 16-18, 2006
0
1000
2000
3000
4000
5000
6000
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
FY
k$
Not including G&A
LHC Project R&D LARP Magnet R&D
High Field Magnets
TD Magnet R&D
Budget and Resources
Actual or budgeted Projected Present resources: 5 physicists 8 engineers 2 designers 9 technicians (~22 FTEs) + support. staff
(~27 FTEs)
• Present Core Program budget ~$2.5-3M/year and present LARP Magnet R&D budget will allow reaching LARP goals and HFM long term goals
• The continuity of the core program allows for continued growth in expertise and infrastructure we are able to respond quickly to the needs of the field
LARP Magnets - G. Ambrosio 15DOE Annual Program Review, May 16-18, 2006
Conclusions
• The SC Magnet R&D program at FNAL is fully engaged in LARP goals and plan with a leading role in several major areas
• The core-program is supporting LARP offering risk mitigation and diversity
• The Long Quadrupoles (2009 deadline) and future prototypes to demonstrate the possibility of a high-luminosity LHC-IR upgrade will be built at Fermilab“We understand and feel our responsibility,
we are doing all possible efforts to accomplish this mission!”