RuPAC2014 - List of Authors (Karpov, G.V.)

Paper

Title

Page

Method of Broadband Stabilization of the VEPP-4M Main Field

100

A.V. Pavlenko, A.M. Batrakov, G.V. Karpov, I.B. Nikolaev, V.V. Svishchev
BINP SB RAS, Novosibirsk, Russia
A.V. Pavlenko
NSU, Novosibirsk, Russia

Funding: Ministry of Education and Science of the Russian Federation, NSh-4860.2014.2
The stability of the main field has great influence on precision experiments on particle physics which are performed on VEPP-4M facility currently. A method of broadband stabilization of the VEPP-4M main field allowing us to achieve field stability better than 0.5 ppm over DC - 50Hz frequency range is presented. The method combines NMR stabilization and feedback loop using induction signal.

THPSC23

Upgrade of BPM System at VEPP-4M Collider

368

E.A. Bekhtenev
NSU, Novosibirsk, Russia
E.A. Bekhtenev, G.V. Karpov
BINP SB RAS, Novosibirsk, Russia

Funding: Ministry of Education and Science of the Russian Federation
Developed in BINP wideband beam position monitor (BPM) electronics has been installed at the VEPP-4M electron-positron collider. The VEPP-4M operates with two electron and two positron bunches. Wide bandwidth of new electronics (200 MHz) allows the separate measurements of electron and positron bunches with time interval between bunches up to 18 ns. 18 BPMs located near four meeting points are supplied with new electronics. The electronics can measure the position of each of four bunches. BPM system works at two modes: slow closed orbit measurements and turn-by-turn measurements. We present details of system design and operation.

THPSC24

Fast Digital Phasemeter for Booster of NICA Project

A.S. Styuf, G.V. Karpov
BINP SB RAS, Novosibirsk, Russia

Measurement of phase difference of two signals is widely-spread task in various regions of science and engineering. For example, in heavy ions accelerators phase difference between high frequency accelerating voltage and first harmonics of beam signal has to be measured. In this case phase measurement is complicated due to fast changing of signals frequency and amplitude. This task can be easy solved if both signals are converted in digital form and processed in FPGA. Fast phase difference meter for frequency range 0.2-6 MHz is described in this paper. The device provides phase difference measurements with measurement time ~17 microseconds and error less than 1 Degree. Signals frequency can be changed with speed up to 20 MHz/sec, signal amplitude can be changed with speed up to 40 dB/sec. A key procedure of phase meter operation is forming of two orthogonal signals on base of reference signal. During quadrature detecting the signal integration for the time equaled the integer number of signal periods is performed. It allows effectively suppress high signal harmonics. Analog electronics contains programmable gain amplifier with gain range 22-50 dB and can work in wide range of signal amplitude. Phase meter electronics features and signal processing methods are represented in this paper. Phase meter parameters and results obtained in ion accelerator are also given.

Paper	Title	Page
TUPSA29	Method of Broadband Stabilization of the VEPP-4M Main Field	100
	A.V. Pavlenko, A.M. Batrakov, G.V. Karpov, I.B. Nikolaev, V.V. Svishchev BINP SB RAS, Novosibirsk, Russia A.V. Pavlenko NSU, Novosibirsk, Russia
	Funding: Ministry of Education and Science of the Russian Federation, NSh-4860.2014.2 The stability of the main field has great influence on precision experiments on particle physics which are performed on VEPP-4M facility currently. A method of broadband stabilization of the VEPP-4M main field allowing us to achieve field stability better than 0.5 ppm over DC - 50Hz frequency range is presented. The method combines NMR stabilization and feedback loop using induction signal.

THPSC23	Upgrade of BPM System at VEPP-4M Collider	368
	E.A. Bekhtenev NSU, Novosibirsk, Russia E.A. Bekhtenev, G.V. Karpov BINP SB RAS, Novosibirsk, Russia
	Funding: Ministry of Education and Science of the Russian Federation Developed in BINP wideband beam position monitor (BPM) electronics has been installed at the VEPP-4M electron-positron collider. The VEPP-4M operates with two electron and two positron bunches. Wide bandwidth of new electronics (200 MHz) allows the separate measurements of electron and positron bunches with time interval between bunches up to 18 ns. 18 BPMs located near four meeting points are supplied with new electronics. The electronics can measure the position of each of four bunches. BPM system works at two modes: slow closed orbit measurements and turn-by-turn measurements. We present details of system design and operation.

THPSC24	Fast Digital Phasemeter for Booster of NICA Project
	A.S. Styuf, G.V. Karpov BINP SB RAS, Novosibirsk, Russia
	Measurement of phase difference of two signals is widely-spread task in various regions of science and engineering. For example, in heavy ions accelerators phase difference between high frequency accelerating voltage and first harmonics of beam signal has to be measured. In this case phase measurement is complicated due to fast changing of signals frequency and amplitude. This task can be easy solved if both signals are converted in digital form and processed in FPGA. Fast phase difference meter for frequency range 0.2-6 MHz is described in this paper. The device provides phase difference measurements with measurement time ~17 microseconds and error less than 1 Degree. Signals frequency can be changed with speed up to 20 MHz/sec, signal amplitude can be changed with speed up to 40 dB/sec. A key procedure of phase meter operation is forming of two orthogonal signals on base of reference signal. During quadrature detecting the signal integration for the time equaled the integer number of signal periods is performed. It allows effectively suppress high signal harmonics. Analog electronics contains programmable gain amplifier with gain range 22-50 dB and can work in wide range of signal amplitude. Phase meter electronics features and signal processing methods are represented in this paper. Phase meter parameters and results obtained in ion accelerator are also given.