06 Apr 09 Target Prototype Metting 1

Positron Target Prototype – Hardware Status

Leo Jenner (T-25)

06 Apr 09 Target Prototype Metting 2

06 Apr 09 Target Prototype Metting 3

06 Apr 09 Target Prototype Metting 4

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 09 Target Prototype Metting 5

Hardware (Instruments)• Torque Transducer – installed, taking data @ 2.4kHz (Torque 1+Angle) , 0.8kHz (Torque 2 + Speed 2)• T12 measurement buffer option = 38.4kHz for 220ms (7.3 revs @ 2000rpm)• 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 09 Target Prototype Metting 6

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 09 Target Prototype Metting 7

Positron Target Prototype – Data Taking Status and

Future Plans

Leo Jenner (T-25)

06 Apr 09 Target Prototype Metting 8

Run plan

B-field

00.20.40.60.81.0

Imm

ersi

on

Speed

2000 rpm

1500 rpm

1000 rpm

500 rpm

06 Apr 09 Target Prototype Metting 9

Data + Analysis

• Fixed immersion, v ∆B

06 Apr 09 Target Prototype Metting 10

Data + Analysis

• Fixed immersion, v ∆B• Fixed immersion, B ∆v

06 Apr 09 Target Prototype Metting 11

Data + Analysis

• Fixed immersion, v ∆B• Fixed immersion, B ∆v• Fixed B, v ∆ immersion

See Duncan Scott’s talk

06 Apr 09 Target Prototype Metting 12

Average speed

06 Apr 09 Target Prototype Metting 13

-3000

-2000

-1000

0

1000

2000

3000

4000

5000

6000

7000

8000

0 1 2 3 4 5 6

Nm

m

no field

field-on

carmen

carmen + friction

carmen + 'field friction'

no field max

field max

Dat

a

Sim

ulat

ion

06 Apr 09 Target Prototype Metting 14

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 09 Target Prototype Metting 15

Extra Slides

06 Apr 09 Target Prototype Metting 16

• 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 = 4.506 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: 14.42 x 0.5^2 / 3 = 1.2 kg m^2

• sum = 3.46 kg m^2 = I

• torque = I dw/dt = Ia