RUPAC2012 - List of Authors (Shichkov, D.)

Paper	Title	Page
WEPPC022	Stand for Precision Measurements of Magnetic Lenses Field Quality	495
	A.S. Tsyganov, A.M. Batrakov, E.S. Kazantseva, A.V. Pavlenko, T.V. Rybitskaya, D. Shichkov, B.A. Skarbo, A.A. Starostenko, P. Vobly BINP SB RAS, Novosibirsk, Russia
	Strict requirements are imposed on the field quality of magnetic elements in today’s synchrotron radiation sources. For example, magnetic field harmonics of quadrupole lenses (currently manufactured in BINP) of main ring NSLS-II, should have no more than one or two ten-thousandths parts of main harmonic at the 75% of lens aperture. The stand is designed for precise measurement of the quadrupole lenses. The well-known technique with a rotating coil was used. The design and location of coils used in the measuring shaft and the method of commutation allow to compensate for both quadrupole and dipole components of the magnetic field. This, in turn, minimizes shaft beats effect and power supply noises effect on the accuracy of the results. During measurements, the shaft is rotated without stopping, and the data received from the gauge angle and digital integrators are processed "on the fly" strictly synchronous. The measurement procedure is performed in one and a half turn of the shaft and takes six seconds. The report describes mechanical design of the stand, principle of work, parameters of the equipment, and software. Results of measurements of the quadrupole lenses synchrotron source NSLS-II are given in conclusion. The results demonstrate possibilities of the stand.

WEPPD032	Multimode Digital Integrators For Precise Magnetic Measurements	617
	A.V. Pavlenko, A.M. Batrakov, D. Shichkov BINP SB RAS, Novosibirsk, Russia P.V. Vagin DESY, Hamburg, Germany
	The induction method of magnetic measurement is the most important, widely used and oldest measurement method for particle accelerator magnets. Nevertheless, both the new demands of the accelerator techniques and possibilities of modern electronics stimulate the creation of more accurate and fast instrumentation, based on the induction method. This report describes the multimode integrators intended for magnetic measurements with the relative accuracy better than 10^-4 and even better than 10^-5 in special cases. Integrators provide high accuracy level both for the constant magnetic field measurements using movable coils and for the pulse measurements also. Modern digital techniques are used to get the partial integral of signal in the strongly determined time interval. The paper considers theoretical issues of the digital integration technique and related error sources. The structure of digital integrator is presented, and key features are listed. In conclusion a brief description of two magnetic measurement systems is given. The first system is used to measure the magnetic field transverse distribution in pulse elements, and the second one – to measure the harmonics in magnetic lenses with constant field.

Paper

Title

Page

Stand for Precision Measurements of Magnetic Lenses Field Quality

495

A.S. Tsyganov, A.M. Batrakov, E.S. Kazantseva, A.V. Pavlenko, T.V. Rybitskaya, D. Shichkov, B.A. Skarbo, A.A. Starostenko, P. Vobly
BINP SB RAS, Novosibirsk, Russia

Strict requirements are imposed on the field quality of magnetic elements in today’s synchrotron radiation sources. For example, magnetic field harmonics of quadrupole lenses (currently manufactured in BINP) of main ring NSLS-II, should have no more than one or two ten-thousandths parts of main harmonic at the 75% of lens aperture. The stand is designed for precise measurement of the quadrupole lenses. The well-known technique with a rotating coil was used. The design and location of coils used in the measuring shaft and the method of commutation allow to compensate for both quadrupole and dipole components of the magnetic field. This, in turn, minimizes shaft beats effect and power supply noises effect on the accuracy of the results. During measurements, the shaft is rotated without stopping, and the data received from the gauge angle and digital integrators are processed "on the fly" strictly synchronous. The measurement procedure is performed in one and a half turn of the shaft and takes six seconds. The report describes mechanical design of the stand, principle of work, parameters of the equipment, and software. Results of measurements of the quadrupole lenses synchrotron source NSLS-II are given in conclusion. The results demonstrate possibilities of the stand.

WEPPD032

Multimode Digital Integrators For Precise Magnetic Measurements

617

A.V. Pavlenko, A.M. Batrakov, D. Shichkov
BINP SB RAS, Novosibirsk, Russia
P.V. Vagin
DESY, Hamburg, Germany

The induction method of magnetic measurement is the most important, widely used and oldest measurement method for particle accelerator magnets. Nevertheless, both the new demands of the accelerator techniques and possibilities of modern electronics stimulate the creation of more accurate and fast instrumentation, based on the induction method. This report describes the multimode integrators intended for magnetic measurements with the relative accuracy better than 10^-4 and even better than 10^-5 in special cases. Integrators provide high accuracy level both for the constant magnetic field measurements using movable coils and for the pulse measurements also. Modern digital techniques are used to get the partial integral of signal in the strongly determined time interval. The paper considers theoretical issues of the digital integration technique and related error sources. The structure of digital integrator is presented, and key features are listed. In conclusion a brief description of two magnetic measurement systems is given. The first system is used to measure the magnetic field transverse distribution in pulse elements, and the second one – to measure the harmonics in magnetic lenses with constant field.