tracker solenoid overview
DESCRIPTION
Tracker Solenoid Overview. Michael A. Green Lawrence Berkeley Laboratory MICE Collaboration Meeting 22 October 2005. AFC Module 2. RFCC Module 1. Tracker Module 1. Tracker Module 2. AFC Module 3. AFC Module 1. RFCC Module 1. MICE Channel with New Tracker. Drawing by S. Q. Yang. - PowerPoint PPT PresentationTRANSCRIPT
22 October 2005 MICE Meeting at RAL 1
Tracker Solenoid Overview
Michael A. Green
Lawrence Berkeley Laboratory
MICE Collaboration Meeting
22 October 2005
22 October 2005 MICE Meeting at RAL 2
Tracker Module 1
Tracker Module 2
AFC Module 1AFC Module 3
AFC Module 2
RFCC Module 1
RFCC Module 1
MICE Channel with New Tracker
Drawing by S. Q. Yang
22 October 2005 MICE Meeting at RAL 3
The New Tracker Magnet Design
22 October 2005 MICE Meeting at RAL 4Tracker Magnet Cryostat
Iron Shield
Iron Shield Brackets
Cold Mass Support
Coolers
Vent Stack
Lead Neck
Radiation Shield Space
Tracker Magnet Stand
Cooler Neck
Drawing by S. Q. Yang
22 October 2005 MICE Meeting at RAL 5
Lead Neck
Cold Mass Support
Liquid He Tube
Fill & Vent Neck
Condenser
4 K Cooler
He Gas Tube
Tracker Magnet Cold Mass and Coolers
The 50 K shields are not shown.
Drawing by S. Q. Yang
22 October 2005 MICE Meeting at RAL 6
• Cold mass and the Superconducting coils
• Cold mass support system that can carry a 50 ton longitudinal force.
• Cooling system based on three 1.5 W coolers.
• Superconductor specification.
• Temperature margin for all magnet coils.
• Magnet power supply system for both tracker magnet modules.
Magnet Components Studied
22 October 2005 MICE Meeting at RAL 7
End Coil 2
Center Coil
Match Coil 1
End Coil 1
Match Coil 2
Coil Cover
Aluminum Mandrel
Liquid Helium Space
490 mm
690 mm
2535 mm
Tracker Magnet Cold Mass Cross-section
Drawing by S. Q. Yang
22 October 2005 MICE Meeting at RAL 8
50 K intercept
Tracker Magnet Cold Mass Cold Link
Warm Link
300 K End
4 K End
Tracker Magnet Cold Mass Support System
Drawing by S. Q. Yang
22 October 2005 MICE Meeting at RAL 9
Cooler #1
Cooler #2 Cooler #3
Cooler 1st Stage
Cooler 2nd Stage
Gas Return PipeFlexible 304 SS
Liquid He Supply Pipe Flexible 304 SS
He Condenser
Top Plate
Tracker Magnet Cooling System
Drawing by S. Q. Yang
22 October 2005 MICE Meeting at RAL 10
Tracker Magnet Parameters
Parameter Match 1 Match 2 End 1 Center End 2Coil length (mm) 198 197 110 1294 110Coil inner radius (mm) 258 258 258 258 258Coil thickness (mm) 46.2 28.6 61.6 22.0 68.2Number of layers 42 26 56 22 62Number of turns per layer 120 119 66 784 66Coil overall current density (A mm –2) 147.6 161.3 136.8 146.9 145.4Coil current I (A) 267.8 271.2 249.5 265.9 265.2Coil self inductance (H) 12.8 5.0 9.6* 41.6* 11.4*Coil Stored Energy at I (MJ) 0.47 0.20 0.30 1.49 0.40
Uniform Field Magnet S
* The uniform field magnet coils in series have a self inductance of 78 H.
Separately Powered
Coil package length = 2530 mm
22 October 2005 MICE Meeting at RAL 11
Tracker Magnet Temperature Margin
1098765432100
50
100
150
200
250
300
350
400
450
500
T = 3.4 KT = 4.2 KT = 5.0 KTracker M1Tracker M2Tracker E1Tracker CTracker E2
Magnetic Induction at the Conductor (T)
Conductor Current (A)
Tracker M1 Margin = 2.0 KTracker M2 Margin = 2.5 KTracker E1 Margin = 1.9 KTracker C Margin = 2.3 KTracker E2 Margin = 1.7 K
Conductor Ic Versus B
22 October 2005 MICE Meeting at RAL 12
Spectrometer Magnet Power Supplyand Connection
Power Supply±10 V, 300 A
Power Supply±10 V, 50 A
PSPSPSPSPSPSPSPower Supply±10 V, 50 A
22 October 2005 MICE Meeting at RAL 13
The Differences between theOld Design and the New Design
22 October 2005 MICE Meeting at RAL 14
Things that are not Changed
• The length of the cryostat from end plate to end plate is unchanged (~2634 mm), but cold mass length is shorter (2535 mm).
• The 400 mm magnet warm bore is unchanged.
• The 250 mm distance from the far end plate to the iron shield is unchanged.
• The longitudinal position of the coil current centers is unchanged.
• The radiation shield position at the AFC end is unchanged.
22 October 2005 MICE Meeting at RAL 15
Increasing the Cryostat Diameterand the New Stand Design
• The outer diameter of the cryostat was increased from 1080 mm to 1407 mm. In addition, there is a new stand, which is conceptually like the RFCC module stand.
• The new stand takes the 50 ton longitudinal force directly to the floor. Because the tracker magnet cryostat is the same diameter as the AFC and RFCC modules, one can carry the magnetic forces to an adjacent module.
• The iron support was changed to fit the new cryostat diameter.
22 October 2005 MICE Meeting at RAL 16
Other Tracker Magnet Changes
• The radial position of the coil current centers has moved inward because all the coils are thinner (despite a 3 mm increase in the inner coil radius).
• Match coil 1 is 4-mm shorter. Match coil 2 is 5-mm shorter. The two end coils are 11-mm shorter.
• The center coil length has been increased from 1260 mm to 1294 mm. As a result, the field uniformity in the tracker has improved.
22 October 2005 MICE Meeting at RAL 17
Other Tracker Changes continued
• The distance from the end AFC coil to the Match Coil 1 has increased by 2 mm. The distance between the current centers is unchanged.
• The distance between end coil 2 and the iron shield has increased 5.5 mm. The distance from the current center of End Coil 2 to the iron shield is unchanged.
• There may yet be small changes (< 5 %) in the turn number in Match Coil 2, End Coil 1 and End Coil 2.
22 October 2005 MICE Meeting at RAL 18
Tracker Magnet Progress and Future Work
22 October 2005 MICE Meeting at RAL 19
Magnet Progress to Date
• Basic module design is almost completed• Coils designed except for possible minor
changes in a couple of coils.• Superconductor specification and start the
bid process.• Cold mass supports are understood.• Design of the cooling system is understood.• Magnet assembly plan has been started.• Magnet quench analysis has been started.• Power supply specification started.
22 October 2005 MICE Meeting at RAL 20
Magnet Tasks Remaining
• Place the order for the superconductor.• Finish the quench calculations.• Prepare a tracker solenoid specification.• Qualify potential magnet vendors.• Finish the magnet assembly plan and write
quality control documents.• Place the order for the tracker solenoids
(probably more than one contract).• Tracker magnet fabrication.
22 October 2005 MICE Meeting at RAL 21
Concluding Comments
• The new tracker magnet will fit with the rest of the tracker module now being designed.
• The tracker magnet design is far enough along to write a performance specification for tracker magnet procurement.
• The superconductor specification has been written and the RFP will go out soon.
• We have identified a number of potential superconductor and magnet vendors.