MECO Production Target Developments

1
MECO Production Target Developments

• J. Popp
• University of California, Irvine
• MECO Collaboration Meeting
• June 2-3, 2003

2
Milestones

• Redesigned target cooling test stand for mobility
• Designed all-plastic water containment shell for
  heating tests
• Machine shop cut rods from variety of promising
  materials for induction heating
• Planned and performed 1st target heating test in
  February 2003
• - confirm engineering design calculations
• - evaluate
• -- performance of test stand with high
  freq. power supply
• -- coil design
• -- cooling shell
• Redesigned target temperature probes
• Added circulation pump to reservoir to eliminate
  temp gradients
• Redesigned target rods for better
  temperature-position information
• Plan 2nd heating test in June 2003

3
Target Cooling Test Stand Diagram

• Monitor water temperature
• - target inlet outlet
• - reservoir
• - target
• Probes
• - thermistors
• - thermocouple
• Measurements of interest
• - power deposition in target
• - heat transfer coefficients
• target
• heat exchanger
• - target surface temperature
• - response times for power cycling

4
Mobile Target Cooling Test Stand

• Stainless steel target prototype
• Steel platform
• - center of mass closer to floor
• - easy to move with
• fork lift or pallet jack

5
Induction Heating

• Ameritherm, Inc.
• http//www.ameritherm.com
• Induction Heat Treeting Co., Huntington Beach,
  CA
• 20 kW, 175 kHz
• 30 kW, 10 kHz

6
Measured Power Deposition

• Lepel 20 kW power unit
• f 175 kHz (rated 450 kHz)
• Carpenter Technologies High Permeability
  Alloy 49, 50/50 Fe/Ni
• Coil
• - 152 turns/m
• - ¼ OD 3/16 ID copper tubing
• Measured Power deposited
• - reservoir temperature rise
• - (outlet inlet) temperature
• Approximately same result 1450 W
• 264 W per K / unit discharge (gpm)

• Solid rod, R 3.0 mm, L 16.0 cm
• Water gap, h 0.4 mm
• Flow rate, Q 1 gpm
• DP 125 psi
• Water containment shell
• - Delrin, 1.5 OD
• - Nylon Swagelok fittings
• - Inlet outlet plastic tubing

7
Target Temperature Probe

• Probe position
• - 1.9 cm in from outlet end
• - gt 0.5 mm from surface
• Ttarget- Tinlet 21.0 C
• IF temperature difference between surface and
  probe can be neglected, then we can scale
  Ttarget- Tinlet
• (Ttarget- Tinlet)PMECO/Ptest
• PMECO 7500 W
• (Ttarget- Tinlet)MECO 108 C
• Need higher volumetric discharge rate for this
  size gap

• Although we do not know the skin depth, due to
  the frequency dependence of m, we can use our
  power and field measurements to place tighter
  limits on d and infer surface temperature.
• The relative permeability could vary between 1
  and 1.44E05, or in terms of skin depth dmax
  0.8353 mm to dmin 0.0022 mm

8
Interpretation of First Heating Test

• Measured H field in center of coil
• Assume sinusoidal H(t)
• Rod length 16.0 cm R 0.3 cm
• Coil length 23.6 cm R 3.8 cm
• If H0 is uniform over rod surface the power
  distribution is completely determined
• From power density distribution we solve
  Poissons eqn for the temperature field
• Obtain the temperature step from core to surface
  of the rod, DT
• radial probe position is not crucial
  for surface temperature measurements.

9
Current Reference Design
10
Production Target Current Design

• Rendered TurboCad drawing of target
  specifications
• W. Molzon B. Christensen have begun target
  intallation drawings

11
Target Installation initial

• W. Molzon
• B. Christensen
• M. Hebert
• J. Popp

12
Target Installation intermediate
13
Target Intallation final
14
Target Installation close-up