| Paper |
Title |
Other Keywords |
Page |
| TUPSA016 |
Stochastic Cooling System Prototype for Nuclotron
|
kicker, ion, vacuum, collider |
74 |
| |
- A. O. Sidorin
JINR, Dubna, Moscow Region
| |
Joint Institute for Nuclear Research (JINR) initiated the creation of a new and unique heavy-ion collider – Nuclotron-based Ion Collider Facility (NICA). By estimations the luminosity will mainly be limited by the intra-beam scattering effect. To suppress one, it was proposed to use the beam cooling. In the coming years it’s planned to construct stochastic cooling system prototype at operating accelerator Nuclotron to test different working modes. An analyze of existing methods of stochastic cooling is given in the report. The first results of simulations and different elements of the system prototype for Nuclotron, as well as plans for its realization at JINR are presented.
|
|
|
|
| TUPSA028 |
Calibration of the Electrostatic Beam Position Monitors for VEPP-2000
|
vacuum, electron, optics, synchrotron |
98 |
| |
- Yu. A. Rogovsky, I. Nesterenko
BINP SB RAS, Novosibirsk
| |
The basic requirement for the VEPP-2000 Beam Position Monitor (BPM) is the measurement of the beam orbit with 0.1 mm precision. To improve the measurement accuracy, the response of the electrostatic BPMs (pickups) were mapped in the laboratory before they were installed in the VEPP-2000 ring. The wire method for the sensitivity calibration and position-to-signal mapping is used. The test stand consists of high frequency coaxial switches to select each pickup electrode, movable antenna to simulate the beam, signal source, spectrum analyzer to measure the pickup signals, and analysis software. This calibration showed possibility of required accuracy. During calibration the electrical center of the different BPMs was measured with respect to the mechanical center. Conversion between the BPM signal and the actual beam position is done by using polynomial expansions fit to the mapping data within ±6 mm square. Results for these portions of the calibration are presented.
|
|
|
|
| TUPSA029 |
Pickup Beam Measurement System at the VEPP-2000 Collider
|
injection, collider, betatron, controls |
101 |
| |
- Yu. A. Rogovsky, E. A. Bekhtenev
BINP SB RAS, Novosibirsk
| |
This paper reviews the present state of electromagnetic beam position monitors (pickups) at VEPP-2000 collider. It includes descriptions of position monitors, typical interfaces for these monitors and their system characteristics (resolution, stability, bandwidth and problems or limitations) are discussed. The paper also reviews several types of diagnostic measurements using beam position monitors which are useful in improving accelerator operations.
|
|
|
|
| TUPSA032 |
The TNK Beam Position Monitor System
|
single-bunch, storage-ring, insertion, feedback |
110 |
| |
- E. A. Bekhtenev, G. V. Karpov, E. Shubin
BINP SB RAS, Novosibirsk
| |
New second generation synchrotron radiation source TNK is being built in Zelenograd, Russia. The new FPGA-based beam position monitor (BPM) system for TNK has been developed and produced in BINP. The BPM system requirements for second generation light sources are not as severe as for the third generation light sources. Nevertheless the system is able to perform turn-by-turn measurements and has micron level accuracy. The TNK light source is intended for work both in multiple and in single bunch mode. In the second case the charge of one bunch can achieve the value of 60 nK result in high peak voltages at BPM electrodes. Design features of the BPM system, its parameters and testing results are presented in this paper.
|
|
|
|
| TUPSA033 |
Transition Radiation Detector which Used Dihedral Angle as Radiator
|
radiation, injection, scattering |
113 |
| |
|
|
| WECHZ02 |
Progress with the 2 MeV Electron Cooler for COSY-Juelich/HESR
|
electron, antiproton, vacuum, target |
147 |
| |
- J. Dietrich, V. Kamerdzhiev
FZJ, Jülich
- M. I. Bryzgunov, A. D. Goncharov, V. V. Parkhomchuk, V. B. Reva, D. N. Skorobogatov
BINP SB RAS, Novosibirsk
| |
The 2 MeV electron cooling system for COSY-Juelich was proposed to further boost the luminosity even in presence of strong heating effects of high-density internal targets. The project is funded since mid 2009. Manufacturing of the cooler components has already begun. The space required for the 2 MeV cooler is being made available in the COSY ring. The design and construction of the cooler is accomplished in cooperation with the Budker Institute of Nuclear Physics in Novosibirsk, Russia. The 2 MeV cooler is also well suited in the start up phase of the High Energy Storage Ring (HESR) at FAIR in Darmstadt. It can be used for beam cooling at injection energy and is intended to test new features of the high energy electron cooler for HESR. The technical layout of the 2 MeV electron cooler is described and the status of component manufacturing is reported.
|
|
|
|
| WEPSB032 |
Transverse Feedbacks in the U70 Proton Synchrotron of IHEP
|
feedback, kicker, damping, controls |
239 |
| |
- O. P. Lebedev, N. A. Ignashin, S. V. Ivanov, S. E. Sytov
IHEP Protvino, Protvino, Moscow Region
| |
To handle the adverse effect of transverse injection errors and resistive-wall instability in the U70, two frequency-band-separated feedback circuits are routinely employed. The first one is a narrow-band (around base-band DC) local end-to-end-analog circuit terminated by an electrostatic kicker. The second is a wide-band band-pass circuit with a variable (–10% ca) digital delay line and low-level DSP units and an electro-magnetic kicker. Both the circuits were subjected to a deep renovation during the recent 5 years, which provided a better control over transverse motion of the beam. The paper reports on technical solutions implemented, problem-oriented R&D studies, and beam observations.
|
|
|
|
| WEPSB034 |
Wideband BPM Electronics for the VEPP-4M Collider
|
electron, positron, storage-ring, collider |
245 |
| |
|
|
| THCHX01 |
Beam Tests of the LHC Transverse Feedback System
|
feedback, kicker, damping, injection |
275 |
| |
- V. Zhabitsky
JINR, Dubna, Moscow Region
- W. Höfle, G. Kotzian, E. Montesinos, M. Schokker, D. Valuch
CERN, Geneva
| |
A powerful transverse feedback system ("LHC Damper") has been installed in LHC in order to stabilise the high intensity beams against coupled bunch transverse instabilities in a frequency range from 3 kHz to 20 MHz and at the same time to damp injection oscillations originating from steering errors and injection kicker ripple. The LHC Damper has been also used for exciting transverse oscillations for the purposes of abort gap cleaning and tune measurement. The LHC Damper includes 4 feedback systems on 2 circulating beams (in other words one feedback system per beam and plane). Every feedback system consists of 4 electrostatic kickers, 4 push-pull wide band power amplifiers, 8 preamplifiers, two digital processing units and 2 beam position monitors with low-level electronics. The power and low-level subsystem layout is described along with first results from the beam commissioning of 16 power amplifiers and 16 electrostatic kickers located in the LHC tunnel. Results of beam tests of the power and low-level subsystems are summarized.
|
|
|
Slides
|
|
|
|
| THPSC021 |
Improving of the INR DTL Tank Accelerating Voltage Stability by Means of the Anode Modulator Feedback
|
feedback, controls, vacuum, cathode |
366 |
| |
- A. I. Kvasha
RAS/INR, Moscow
| |
The INR DTL RF system consists of five RF channels with output pulse RF power from 1 to 2.5 MW. In turn, in every channel there are four RF vacuum tube amplifiers and two anode modulators. The output RF power amplifier anode modulator with hard discharger (vacuum tube GMI-44A) is used as executive device of accelerating voltage control system. The pulse transformer data at the GMI-44A input and time delay in the feedback of the control system don't allow ensuring the required accelerating voltage stabilization. Improving in a few times of accelerating field stabilization can be achieved by means of anode modulator feedback. Results of a numerical simulation of both feedbacks using MicroCap 8 are presented.
|
|
|
|
| THPSC022 |
Development and Application of Electron Linac Electromagnetic Devices for Radiotechnologies
|
linac, electron, controls, target |
369 |
| |
- V. A. Shendrik, A. N. Dovbnya, A. E. Tolstoy
NSC/KIPT, Kharkov
| |
The creation and subsequent service of modern electron linear accelerators at the NSC KIPT have brought evidence for possible successful introduction of radiotechnology processes using electron irradiation. A further extension and complication of physical problems solvable on the basis of radiotechnologies have put forward new and increased requirements for the systems of beam scanning, extraction and formation on the targets and extended irradiated objects. The results of applying our methods developed for prompt measurement of the kinetic energy of the scanned electron beam are presented. For measurement and continuous control of the electron energy the hodoscope magnetic spectrometer technique has been used. The spectrometer includes only one deflecting magnet and has no magnetic focusing. If the real field topography in the magnet is known in detail, then using the input and output coordinates of deflected particles it is possible to determine their energy, and also the chromaticity of electron beam. The step-pulse scanning of the beam is realized through the use of an air-core short-pulse electromagnet. Development and tests of separate units of the device are under way
|
|
|
|