06 Apr 09Target Prototype Metting1 Positron Target Prototype – Hardware Status Leo Jenner (T-25)

06 Apr 09Target Prototype Metting2

06 Apr 09Target Prototype Metting3

06 Apr 09Target Prototype Metting4 Hardware Components Motor and Controller – installed, CTsoftware works fine, operating in open-loop configuration Magnet Control – complete remote control of magnet from LabView Webcams – installed and functional

06 Apr 09Target Prototype Metting5 Hardware (Instruments) Torque Transducer – installed, taking 2.4kHz (Torque 1+Angle), 0.8kHz (Torque 2 + Speed 2) T12 measurement buffer option = 38.4kHz for 220ms ( rpm) 2 x Accelerometers – installed, not routinely taking data, rate = 1 kHz Encoder plus – read-out with LabView – writes to disk at 42 Hz. May be able to improve the code Thermal cameras – ready but not installed

06 Apr 09Target Prototype Metting6 Outstanding Hardware Field map Coil temperature measurement Air flow analysis Immersion calibration Bx, By Field Integral measurement Conductivity measurement Accelerometer calibration Torque transducer calibration – 50hz? Thermal camera calibration

06 Apr 09Target Prototype Metting7 Positron Target Prototype – Data Taking Status and Future Plans Leo Jenner (T-25)

06 Apr 09Target Prototype Metting8 Run plan B-field Immersion Speed 2000 rpm 1500 rpm 1000 rpm 500 rpm

06 Apr 09Target Prototype Metting9 Data + Analysis Fixed immersion, v ∆B

06 Apr 09Target Prototype Metting10 Data + Analysis Fixed immersion, v ∆B Fixed immersion, B ∆v

06 Apr 09Target Prototype Metting11 Data + Analysis Fixed immersion, v ∆B Fixed immersion, B ∆v Fixed B, v ∆ immersion See Duncan Scott’s talk

06 Apr 09Target Prototype Metting12 Average speed

06 Apr 09Target Prototype Metting13 Data Simulation

06 Apr 09Target Prototype Metting14 Data Challenges Venture past 500 rpm Check run repeatability Moment of Inertia (Duncan?) See torque/accelerometer peak α rpm Use encoder to look for spokes Study change of frequency from 0 to 1 T ? Reverse rotation? Eddy current deceleration?

06 Apr 09Target Prototype Metting15 Extra Slides

06 Apr 09Target Prototype Metting16 mass of wheel (ish:) r=0.5m rim = 40 mm x 16 mm = 2 x pi x 500 x 40 x 16 = 2011 cm^3 spoke = 5 x 500 x 40 x 16 = 1600 cm^3 dens = g / cm^3 -> 16.3 kg or add on spokes again ~ tapered spokes -> 23.5 kg moment of inertia of rim: 9.06 x 0.5^2 = 2.26 kg m^2 spokes: x 0.5^2 / 3 = 1.2 kg m^2 sum = 3.46 kg m^2 = I torque = I dw/dt = Ia