Cyclotrons2013 - List of Keywords (alignment)

Paper	Title	Other Keywords	Page
TUPSH009	Magnetic Field Mapping of the Best 70 MeV Cyclotron	cyclotron, target, controls, vacuum	239
	F.S. Grillet, B.F. Milton BCSI, Vancouver, BC, Canada D.T. Montgomery Cedarflat Precision Inc., Burnaby, British Columbia, Canada
	As is well known, the mapping of a cyclotron magnet presents several key challenges including requirements for a high degree of accuracy and difficult space constraints in the region to be measured. Several novel solutions were used to create the mapper for the Best 70 MeV cyclotron, which is based on an earlier version used to map the Best 14 MeV cyclotron. Based on a temperature compensated 3-Axis hall probe that is continuously sampled while the probe travels along a radial arm a high degree of positional accuracy is achieved by simultaneously sampling optical encoders located with the probe. A novel implementation using air bearings and air jets provides axial rotation of the arm with almost no metal parts. The mapper has achieved a full 360 degree map in 1 degree theta steps, and 2.5mm radial steps in 2 hours and 40 minutes, with a relative radial accuracy of ±0.02mm and angular accuracy of ±0.001 degrees. This paper will describe how the simultaneous challenges of designing with no metal parts while achieving a high degree of rigidity and precision have been addressed.

TU4PB04	Methods of Increasing Accuracy in Precision Magnetic Field Measurements of Cyclotron Magnets	cyclotron, HOM, controls, LabView	283
	N.V. Avreline, W. Gyles, R.L. Watt ACSI, Richmond, B.C., Canada
	A new magnetic field mapper was designed and built to provide increased accuracy of cyclotron magnetic field measurements. This mapper was designed for mapping the magnetic fields of TR-19, TR-24, and TR-30 cyclotron magnets manufactured by Advanced Cyclotron Systems Inc. A Group3 MPT-141 Hall Probe (HP) with measurement range from 2 G to 21 kG was used in the mapper’s design. The analogue monitor output was used to allow fast reading of the Hall voltage. Use of a fast ADC NI9239 module and error reduction algorithms, based on a polynomial regression method, allowed the reduction of noise to 0.2 G. The HP arm was made as a carbon fibre foam sandwich. This rigid structure kept the HP arm in a flat plane within 0.1 mm. In order to measure the high gradient field, the design of this mapper provided high resolution of HP arm angle within 0.0005° and of radial position within 25 μm. A set of National Instrument interfaces connected through a network to a desktop computer were used as a base of control and data acquisition systems. The mapper was successfully used to map TR-19 and TR-24 cyclotron magnets.
	Slides TU4PB04 [4.572 MB]

Paper

Title

Other Keywords

Page

TUPSH009

Magnetic Field Mapping of the Best 70 MeV Cyclotron

cyclotron, target, controls, vacuum

239

F.S. Grillet, B.F. Milton
BCSI, Vancouver, BC, Canada
D.T. Montgomery
Cedarflat Precision Inc., Burnaby, British Columbia, Canada

As is well known, the mapping of a cyclotron magnet presents several key challenges including requirements for a high degree of accuracy and difficult space constraints in the region to be measured. Several novel solutions were used to create the mapper for the Best 70 MeV cyclotron, which is based on an earlier version used to map the Best 14 MeV cyclotron. Based on a temperature compensated 3-Axis hall probe that is continuously sampled while the probe travels along a radial arm a high degree of positional accuracy is achieved by simultaneously sampling optical encoders located with the probe. A novel implementation using air bearings and air jets provides axial rotation of the arm with almost no metal parts. The mapper has achieved a full 360 degree map in 1 degree theta steps, and 2.5mm radial steps in 2 hours and 40 minutes, with a relative radial accuracy of ±0.02mm and angular accuracy of ±0.001 degrees. This paper will describe how the simultaneous challenges of designing with no metal parts while achieving a high degree of rigidity and precision have been addressed.

TU4PB04

Methods of Increasing Accuracy in Precision Magnetic Field Measurements of Cyclotron Magnets

cyclotron, HOM, controls, LabView

283

N.V. Avreline, W. Gyles, R.L. Watt
ACSI, Richmond, B.C., Canada

A new magnetic field mapper was designed and built to provide increased accuracy of cyclotron magnetic field measurements. This mapper was designed for mapping the magnetic fields of TR-19, TR-24, and TR-30 cyclotron magnets manufactured by Advanced Cyclotron Systems Inc. A Group3 MPT-141 Hall Probe (HP) with measurement range from 2 G to 21 kG was used in the mapper’s design. The analogue monitor output was used to allow fast reading of the Hall voltage. Use of a fast ADC NI9239 module and error reduction algorithms, based on a polynomial regression method, allowed the reduction of noise to 0.2 G. The HP arm was made as a carbon fibre foam sandwich. This rigid structure kept the HP arm in a flat plane within 0.1 mm. In order to measure the high gradient field, the design of this mapper provided high resolution of HP arm angle within 0.0005° and of radial position within 25 μm. A set of National Instrument interfaces connected through a network to a desktop computer were used as a base of control and data acquisition systems. The mapper was successfully used to map TR-19 and TR-24 cyclotron magnets.

Slides TU4PB04 [4.572 MB]