Magnet and ferrites tests Luciano Elementi Mu 2

Magnet and ferrites tests Luciano Elementi Mu 2 e Extinction Technical Design Review 2 November 2015

Outline • Preliminary tests (ferrites and temperatures) • Tests performed on the half meter model • Results • Plans • Conclusions 2 Luciano Elementi| Magnet and ferrites tests 11/2/2015

Preliminary tests and ferrite choice • Both Mn Zn and Ni Zn Ferrite materials work to achieve the required magnetic field. • However Ni Zn Ferrites has been selected because it is a better insulator therefore it allows direct cooling through the copper tubing (i. e. the hottest part of the ferrite) * The copper tubing is in direct contact with the ferrites and at high voltage at the same time * • Power losses are mostly from hysteresis and we concentrated (and tested) two ferrites on the model: CMD 10 and CMD 5005 both from Ceramic Magnetics 3 Luciano Elementi| Magnet and ferrites tests 11/2/2015

First Model (RTD Placement) 4 Luciano Elementi| Magnet and ferrites tests 11/2/2015

Preliminary temperature test (First Model) 5 Luciano Elementi| Magnet and ferrites tests 11/2/2015

Testing 1. H Bridge, Switch mode Power Supply (300 k. Hz) 2. DC Power Supply and Impedance Matching transformer 3. RF Amplifier (5. 1 MHz) and Impedance Matching Transformer 4. RTD (14 ea) 5. B dot Loop (Direct Measure of the B Field) 6 Luciano Elementi| Magnet and ferrites tests 11/2/2015

First Model (RTD Placement) 7 Luciano Elementi| Magnet and ferrites tests 11/2/2015

Preliminary temperature test (First Model) 8 Luciano Elementi| Magnet and ferrites tests 11/2/2015

First Model: RTD 1 9 Luciano Elementi| Magnet and ferrites tests 11/2/2015

First Model: RTD 10 10 Luciano Elementi| Magnet and ferrites tests 11/2/2015

CMD 10 Estimated asymptotic terminal temperature (distribution) 200° C 160° C 120° C • High temperatures indicates a problem with the ferrite contact to the copper tube. • This was fixed, the test repeated and the resulting temperature readout limited to close to 100° C 11 Luciano Elementi| Magnet and ferrites tests 11/2/2015

Temperature Distribution: Non Resettable Stickers Results (CMD 10) 140. 0 120. 0 100. 0 80. 0 60. 0 40. 0 20. 0 0 100 200 300 400 • Acceptable Temperature of range Max ~ 130° C 12 Luciano Elementi| Magnet and ferrites tests 11/2/2015 500 600 (min

5. 1 MHz • High harmonic constitutes no problem from a temperature stand point since the power used is considerably less • Temperature data are indicative °C 13 Luciano Elementi| Magnet and ferrites tests 11/2/2015

More testing: 1. CMD 10 Power Measurements 2. CMD 5005 Power Measurements 3. Temperature measurement • • RTD Not Resettable Temperature Sensors 4. Magnetic Field (Transfer Function) 5. Magnetic field uniformity (longitudinal and transversal) 6. Tune stability measurements (cold start and in time) 14 Luciano Elementi| Magnet and ferrites tests 11/2/2015

Temperature Distribution: Non Resettable Stickers (Continue) 15 Luciano Elementi| Magnet and ferrites tests 11/2/2015

Industrial Building #2 Set-Up. More testing 16 Luciano Elementi| Magnet and ferrites tests 11/2/2015

Power Measurements (for instance here CMD 10 at 300 k. Hz) 17 Luciano Elementi| Magnet and ferrites tests 11/2/2015

Ni-Zn Ceramic Magnetics Ferrites; comparison CMD 10 CMD 5005 CMD 10 was selected because of its higher curie temperature 18 Luciano Elementi| Magnet and ferrites tests 11/2/2015

Field Distribution Results 300 k. Hz 5. 1 MHz Transfer Function Gauss/Ampere CMD 10 1. 08 1. 13 1. 06 1. 11 1. 04 1. 09 1. 02 1. 00 CMD 5005 1 2 3 4 5 1. 07 6 7 8 9 10 Coil Number 19 CMD 5005 1. 15 Luciano Elementi| Magnet and ferrites tests 11 1. 05 CMD 10 1 2 3 4 5 6 7 8 Coil Number 11/2/2015 9 10 11

Tune Stability Resonant Frequency (MHz) 301 300. 5 300 299. 5 299 298. 5 298 297. 5 297 296. 5 0 50 100 150 Time (Minutes) 200 250 The resonant frequency is considerably stable 20 Luciano Elementi| Magnet and ferrites tests 11/2/2015

Requirements and plan (Production Magnet) v Change: 18 mm Aperture and 1 meter length v We expect that this new magnet will also meet the requirements for Dissipation, Ferrite Temperature Field uniformity v We propose to confirm this by thoroughly testing the first magnet built And this is how we are going to proceed: • • 21 RTD in key point along the magnet More Non Resettable Temperature Sensors Field Distribution (Possibly also as a testing tool) Tuning, Stability and Power (measurements) Luciano Elementi| Magnet and ferrites tests 11/2/2015

Conclusions • The ferrite material has been decided • The prototype design met the specification requirements • There is a plan for the test and measurements to take place on the first production magnet to confirm that this also meet specifications 22 Luciano Elementi| Magnet and ferrites tests 11/2/2015