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Generator magnet p rogram : The future .

Generator magnet p rogram : The future . 85T Multi-Shot and 60T Long Pulse magnets are state of the art world record magnets with an established user program producing first rate science. Power supply needed to condition the generator output produces electrical noise (720Hz).

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Generator magnet p rogram : The future .

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  1. Generator magnet program: The future. 85T Multi-Shot and 60T Long Pulse magnets are state of the art world record magnets with an established user program producing first rate science. Power supply needed to condition the generator output produces electrical noise (720Hz). Capacitor driven magnets are essentially noise free. Pulse time is undetermined making background subtraction between pulses impossible.

  2. Filtering and damping. • Low frequency requires large impractical filter capacitors. • Filter out noise using a copper damper tube in the magnet bore. • Reduces bore on the 60T Long Pulse from 32mm to 15mm. • Impractical on the 100T Multi-shot magnet with 10mm bore. db/dt (AU)

  3. Another solution. 10KHz 4KV switching power supply with filtering can reduce the noise to the same level as the best capacitor driven magnets. Magnetic field (T) Magnetic field (T) Upgraded high frequency power supply ~ 2T/S Current Power supply ~ 450 T/S

  4. High frequency power supply upgrade. • Cost estimate for a 4 kV, 20 kA, 0.5 sec., 10 kHz, 2-level voltage source converter module. • Systems engineering. $200K • PWM-VSI Module, aux. systems & converter control system $2M - $4M • Existing LANL power supply system hardware modifications $100K • Software modification design, implementation & testing. $200K • System commissioning $100K • Total $2.6M - $4.6M • 2 years to specify, purchase and install system with a 6 months downtime for generator magnets.

  5. 300T single turn magnet. • Highest magnet field at the NHMFL 270T • 170T routine field at a cost of $120/shot (45 min/shot)

  6. Single walled carbon nanotubesin ultra-high magnetic fields. Ultra-High Magnetic Fields are used to dynamically align Single Walled Carbon Nano-Tubes (SWCNT) and to modify the electronic structure Magnetic field dependent traces ofmeasured(purple) and simulated (black) normalized linear dichroismvs applied magnetic field. The hysteresis is indicative of the lag to the magnetic field produced by our poly- disperse length sample: (a) 56 T, ms-pulse, and (b) 140 T, pulse. C. Mielke, M. Altarawneh , S. Crooker, MPA-NHMFL, M. von Ortenberg, S. Hansel (Humboldt University), O. Portugall (LNCMP Toulouse, France), J. Shaver, L. Booshehri, A. N. G. Para-Vasquez, M. Pasquali, C. Pint, and J. Kono (Rice University) CNT’s align with the applied magnetic field due to their diamagnetic nature.

  7. Magneto-IR-resonance in graphene in ultra-high pulsed magnetic fields. • Data taken by L. Booshehri & C. H. Mielke using the Single-Turn Coil System at NHMFL, Los Alamos • Magneto-transmission measurements at 10.6 μm up to 170 T • Clear absorption resonance observed at ~60 T (not expected for undoped graphene)

  8. 300T single shot. Benefits to the program. • $4.2M + $2.0M into the NHMFL-PFF since 2003 from the Los Alamos Laboratory Directed Research and Development (LDRD) program. • 3 Postdocs & 4 Graduate students. • Advancements in signal to noise with proximity diode oscillator (Pdo) and Tunnel diode oscillator (Tdo) techniques. • FIR, Cyclotron resonance, Streak camera vis/spect & SupercontinuumWhite light generation capabilities. • Actinide sample handling and encapsulation.

  9. 300T single shot. The future. • No funding in the core grant to support the single shot program. • Weapons funds for dynamic high pressure measurements. • 3 external user experiments scheduled so far this year. • To expand the capabilities of the NHMFL-PFF the single turn program needs to be an integral part of the NSF user program. • Dedicated Staff scientist and Technician to improve existing and develop new techniques. ($500K/year). • Operating budget ($300K/year) Maintenance, cryogens, design and fabrication of new probes.

  10. Cryogens at the PFF. • PFF spends >$1M/year on cryogens. • ~ 1M Liters liquid nitrogen/year mainly for cooling and purging the large magnets. (~$0.25/L) • ~ 50K liters Liquid Helium/year (user program only).(~$15/L) • $5M for hardware to recover helium and liquefy both helium and nitrogen. • $100K/year technician and running costs. • Investment will enable the PFF to be cryogen self sufficient.

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