AND NEXT STEPS LARP P Collab labor orat ation ion Meet eting - PowerPoint PPT Presentation

FERMILAB PROGRAM RESULTS AND NEXT STEPS LARP P Collab labor orat ation ion Meet eting ng 14 Fermilab rmilab, , April il 26-28 28 Guram am Chlachidz hidze

Guram Chlachidze 4/27/2010 OUTLINE  Introduction  Single Nb 3 Sn quadrupole coil test in a “magnetic mirror” structure  Effect of coil pre-stress on magnet performance  Complementary to study performed by LARP (TQS03)  Development and test of a quadrupole magnet with “dipole style” collars  Reduction of assembly time and of the risk of coil damage  Future plans 2

Guram Chlachidze 4/27/2010 INTRODUCTION Fermilab, along with other US National Laboratories, is developing a new generation of accelerator magnets based on Nb 3 Sn super-conductor  Study and optimization of Nb 3 Sn strands and cables, insulation  Fabrication of coils and other components with various design and processing features  Fabrication and test of a series of model magnets  Nb 3 Sn coil technology scale-up Recent technology developments within Fermilab’s base High Field Magnet (HFM) program include  Quadrupole mirror structure to test single quadrupole coils in a real magnetic field environment  Assembly and test of a Technology Quadrupole (TQC) with a dipole style collar design and coil alignment 3

Guram Chlachidze 4/27/2010 TQ MIRROR STRUCTURE  The “Magnetic Mirror” concept was developed for the HFM dipole and now expanded to include the 90-120-mm quadrupoles  Long mirror dipoles (LM01, LM02) were built and successfully tested for the Nb 3 Sn coil technology scale-up  Design details and first test results were presented at LARP Collaboration Meeting 13 (Port Jefferson, November 2009) by Rodger Bossert  http://larpdocs.fnal.gov/LARP-public/DocDB/DisplayMeeting?conferenceid=69  Specific coil and cable features can be tested and optimized efficiently, in a short time period  Re-assembly turnaround time is about 3 weeks  2.5 months required for construction of a mirror magnet with a new coil (compare to ~ 6 months for a quadrupole magnet)  Simplified structure – coil to coil interactions not present – an intermediate step to speed up overall magnet development time 4

Guram Chlachidze 4/27/2010 TQ MIRROR DESIGN FEATURES AND HISTORY Mirror COIL # STRAND AND CABL BLE INSULA SULATI TION ON COIL POLE TQM01 19 RRP 54/61 LBNL S2-Glass Bronze Sleeve TQM02 17 RRP 54/61 LBNL S2-Glass Bronze Sleeve TQM03: 34 RRP 108/127 FNAL E-Glass Tape Titanium a, b, c TQM01 and TQM02 mirror magnets were tested in Jan.-April 2009 Test results were presented at CEC/ICMC and MT-21 in 2009 Coil quench performance in the mirror structure found consistent with the performance in TQS and TQC models TQM03 magnets tested in Jun.-Aug. 2009 and Feb.2010 3 variations with different coil pre-loads Cable based on RRP-108/127 strand was fabricated at Fermilab E-Glass tape was used for cable insulation instead of expensive S2-Glass sleeve 5

Guram Chlachidze 4/27/2010 COIL PRE-STRESSES IN QUADRUPOLE MIRROR TQM03c shim system Illustration MIRROR Measure ured d Air Predict cted d 5 mil kapton sheet warm stress war ess Gap Cold stress ess 3 mil kapton sheets (2) 2 mil (MPa Pa) (mils) s) (MPa Pa) kapton sheets TQM01 100 4 90 (2) 5 mil TQMO2 100 6 110 kapton sheets 10 mils (will be removed after ini- TQM03a 100 5 100 Coil 34 tial pressing.) TQMO3b 105 8 145 TQM03c 135 10 185 7 mils (will remain after assembly.) 5 mil kapton Gauges bonded directly to coils confirmed 168 mil thick G-10 mid-plane shim pre-loads at room temperature, however these gauges are not compensated at LHe temperatures. Therefore, cold pre-loads Shim system = 17/7 are assumed from FEM analysis Next mirror magnet (TQM04) will be equipped with gauges connected in a full- bridge configuration on Titanium pole and will be compared to analysis 6

Guram Chlachidze 4/27/2010 TQM03 M03 QUEN ENCH CH TRAIN INING ING 16000 ~97% of SSL ~92% of SSL 14000 nt (A) 12000 ch Current 10000 Quench 4.5 K 1.9 K 4.5 K 8000 TQM03a 6000 TQM03b TQM03c 4000 SSL at 4.5K ~ 13.0 kA 1.9K ~ 14.4 kA 7

Guram Chlachidze 4/27/2010 QUENCH LOCATIONS 10 T 6 T 16000 2 T 14000 12000 Coil cross section with flux density 10000 distribution in mirror magnet at 14 kA Current (A) 8000 6000 TQM03b - all quenches in A10_B2 A6_A7 4000 TQM03a A7_A8 TQM03c - 4.5 K quenches in A10_B2 2000 A8_A9 1.9 K quenches in A2_A3 A10_B2 0 0 20 40 60 Quench Number 8

Guram Chlachidze 4/27/2010 TQM03 RAMP RATE DEPENDENCE 14000 4.5 K 13000 12000 t (A) ent C 11000 Curren B 10000 TQM03a 4.5K 9000 TQM03b 4.5K TQM03c 4.5K A 8000 0 100 200 300 400 Ramp Rate e (A/s) 14000 13000 C 12000 t (A) B ent 11000 rren Curr 10000 A TQM03a 1.9K 9000 TQM03b 1.9K TQM03c 1.9K 1.9 K 8000 0 100 200 300 400 Ramp Rate e (A/s) 9

Guram Chlachidze 4/27/2010 TQM03 TEMPERATURE DEPENDENCE 13800 Ramp rate : 20 A/s TQM03a 13600 TQM03b 13400 TQM03c 13200 13000 ent (A) Current 12800 12600 12400 12200 12000 11800 1 1.5 2 2.5 3 3.5 4 4.5 5 Temp mper erature ature (T) 10

Guram Chlachidze 4/27/2010 SUMMARY OF TQM03 MODELS A “magnetic mirror” structure for quadrupole coil evaluation has been developed and successfully employed in testing at Fermilab Coil with Nb 3 Sn RRP-108/127 strand and new cable insulation (E-Glass tape) demonstrated excellent quench performance and improved stability at 1.9 K • RRP 108/127 is now LARP baseline strand • E-glass insulation is considered for long LQ coils Coil pre-stress up to ~185 MPa does not introduce significant degradation in conductor I c (consistent with TQS03 test data). However noticeable degradation of conductor stability at 1.9 K was observed (TQM03c) Next : New Nb 3 Sn coil (RRP 108/127) with cored conductor is ready for test in mirror structure (TQM04) 11

Guram Chlachidze 4/27/2010 TQC MAGNET WITH DIPOLE STYLE COLLARS  Feasibility of quadrupole support structure and collaring procedure based on traditional quadrupole-style collar have been demonstrated in several TQC model magnets  Requires additional horizontal to vertical handling of the coils  Collaring using short vertical 4-jaw press with partial coil compression along the length  Time consuming process with many (~6-8) passes and some risk of damage to coils  Dipole style collar design  Collaring using full-length horizontal press  Collaring in a single pass reducing coil degradation risks and construction time 12

Guram Chlachidze 4/27/2010 TQC02EB TEST AT FERMILAB  Magnet was built with Nb 3 Sn coils (RRP 54/61) already tested in both shell and collar structures  4 variations of TQS02 magnet were tested at Fermilab and CERN  TQC02Ea with coils 20,21,22 and 23 previously tested at Fermilab  Standard shim configuration with a target stress of ~120 MPa at 4.5 K  First time dipole style collars are used in TQC magnet  Coil alignment key installed  Test at 4.5 K and 1.9 K included magnet training, ramp rate and temperature dependence study 13

Guram Chlachidze 4/27/2010 TQC02EB QUENCH HISTORY ~217 T/m ~211 T/m 14000 1.9 K 4.5 K 4.5 K 13000 12000 11000 ent (A) 10000 Current 9000 8000 7000 coil 20 6000 coil 22 coil 23 5000 coil 28 4000 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 Quench h Nu Number ber 14

Guram Chlachidze 4/27/2010 TQC02E AND TQS02 PERFORMANCE AT 4.5 K 14000 13000 12000 11000 10000 ent (A) Current 9000 8000 7000 TQC02Ea 4.5K TQC02Eb 4.5K 6000 TQS02a 4.5K 5000 TQS02c 4.2K 4000 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Quench h Nu Number ber 15

Guram Chlachidze 4/27/2010 TQC02EB RAMP RATE DEPENDENCE 14000 4.5 K 13000 12000 t (A) 11000 ent Curren 10000 9000 8000 TQC02Eb 4.5K 7000 TQS02c 4.2K 1.9 K 6000 13000 0 100 200 300 Ramp Rate (A/s) 12000 11000 t (A) 10000 ent Curren 9000 8000 TQC02Eb 1.9K 7000 TQS02c 1.9K 6000 0 100 200 300 Ramp Rate (A/s) 16

Guram Chlachidze 4/27/2010 TQC02EB TEMPERATURE DEPENDENCE 14500 TQC02Eb 50A/s 14000 TQS02c 20A/s 13500 13000 ent (A) 12500 Current 12000 11500 11000 10500 10000 1 2 3 4 5 Temp mper erature ature (K) 17

Guram Chlachidze 4/27/2010 SUMMARY ON TQC02EB TEST The first Technology Quadrupole with a dipole style collar design - TQC02Eb - was built and tested successfully at Fermilab TQC02Eb reached ~211 T/m field gradient at 4.5 K and ~217 T/m at 3.2K temperature Coil quench performance in magnets of shell (TQS02) or collar (TQC02E) structure is consistent Multiple handling and test cycles demonstrates that the TQ Nb 3 Sn coil design is robust Magnetic field measurements do not show any significant distortions related to the dipole style collar design in TQC02Eb 18