simulation

Paper	Title	Other Keywords	Page
TUCOB01	Stochastic Cooling Project at the Experimental Storage Ring, CSRe at IMP	pick-up, kicker, vacuum, impedance	64
	J. X. Wu, J. W. Xia, Y. Zhang IMP, Lanzhou F. Caspers CERN, Geneva T. Katayama, F. Nolden GSI, Darmstadt
	Stochastic cooling at the experimental Cooler Storage Ring, CSRe at the Institute of Modern Physics (IMP) in China, will be used mainly for the experiments with radioactive fragment beams. Those RI beams arrive from the fragment separator with the emittance of 20-50 mm. mrad and the momentum spread Dp/p of ± 0.5~1.0 %. The equipped electron cooler is not able to cool down this hot beam within enough short period. Stochastic cooling is effective for these RI beams to reduce the emittance to less than 5 mm.mrad and Dp/p of 5·10-4 within 2-20 sec. After the stochastic pre-cooling, the electron cooling will further cool down the emittance and Dp/p within several seconds. The paper gives the design of the stochastic cooling system and the simulation results. The new developed forward traveling wave structure is presented as well as the measured results of test model.
	Slides
TUCOA01	Helical Cooling Channel Developments	dipole, emittance, collider, electron	67
	R. P. Johnson, C. Y. Yoshikawa Muons, Inc, Batavia Y. S. Derbenev, V. S. Morozov JLAB, Newport News, Virginia
	Helical Cooling Channels, based on the same helical dipole Siberian Snake magnets used for spin control in synchrotrons and storage rings, are now proposed for almost all stages of muon beam cooling that are required for high luminosity muon colliders. We review the status of the theory, simulations, and technology development for the capture, phase rotation, 6-D ionization cooling, parametric-resonance ionization cooling, and reverse emittance exchange sections of one of the candidate scenarios for a high-luminosity. high-energy muon collider.
	Slides
TUIOA01	MICE step I: First Measurement of Emittance with Particle Physics Detectors	emittance, optics, quadrupole, betatron	71
	R. Asfandiyarov DPNC, Genève
	The muon ionization cooling experiment (MICE) is a strategic R&D project intending to demonstrate the only practical solution to prepare high brilliance beams necessary for a neutrino factory or muon colliders. MICE is under development at the Rutherford Appleton Laboratory (UK). It comprises a dedicated beam line to generate a range of input emittance and momentum, with time-of-flight and Cherenkov detectors to ensure a pure muon beam. The emittance of the incoming beam is measured in the upstream magnetic spectrometer with a sci-fiber tracker. A cooling cell will then follow, alternating energy loss in Li-H absorbers and RF acceleration. A second spectrometer identical to the first and a second muon identification system measure the outgoing emittance. In the 2010 run the beam and most detectors have been fully commissioned and a first measurement of the emittance of a beam with particle physics (time-of-flight) detectors has been performed. The analysis of these data should be completed by the time of the Conference. The next steps of more precise measurements, of emittance and emittance reduction (cooling), that will follow in 2011 and later, will also be outlined.
	Slides
WEIOA01	Enhancing Trappable Antiproton Populations Through an Induction Unit Followed by Frictional Cooling	antiproton, rfq, scattering, induction	85
	A. Sessler, G. Penn, J. S. Wurtele, M. S. Zolotorev LBNL, Berkeley, California A. E. Charman UCB, Berkeley, California
	An induction unit, followed by frictional cooling, is applied to the antiproton bunches delivered by CERN's antiproton decelerator (AD) at 5 MeV. The scheme requires about 1 meter of induction unit to reduce a fraction of the 200 ns pulse to 60 keV after which frictional cooling, involving a set of thin foils, reduces the anti-protons to about 5 keV where they can be captured in an anti-proton trap. The scheme is compared to a further de-acceleration ring (such as ELENA) and to a degrading foil from the 5 MeV of the AD alone. Theory and simulations provide a preliminary assessment of the concept's strengths and limitations. The comparisons are limited largely by poorly-known levels of multiple scattering of low-energy antiprotons and experimental experience is employed.
	Slides
TUPS05	Simulation of High-Energy Electron Cooling at COSY with BETACOOL Program	electron, target, luminosity, proton	95
	L. J. Mao, J. Dietrich FZJ, Jülich
	A 2 MeV electron cooling device will be installed at COSY in order to boost the luminosity of pellet target experiments. The magnetized electron cooling technique is used to compensate the energy loss and emittance growth for future COSY pellet target experiments. In this article, a numerical simulation of cooling process is performed with BETACOOL code. The cooling time is calculated for variant cooler setting parameters. The intrabeam scattering (IBS) and target effect are essential for prediction of equilibrium beam parameters. The influence of the pellet target on the beam parameters is demonstrated.
TUPS06	Electron Gun with Variable Beam Profile for COSY Cooler	electron, gun, controls, cathode	99
	A. V. Bubley, M. I. Bryzgunov, A. V. Ivanov, A. M. Kruchkov, V. V. Parkhomchuk, V. B. Reva BINP SB RAS, Novosibirsk
	Electron gun with variable beam profile is used on COSY 2 MeV cooler to optimize the cooling process. Further development of the gun is achieved with the help of the four-sector control electrode that provides some new features. Combined with BPMs it gives the possibility of the electron beam shape estimation. Application of the gun for stochastic cooling is also discussed in the article.
TUPS10	Magnetic System of Electron Cooler for COSY	electron, dipole, power-supply, pick-up	114
	V. M. Panasyuk, M. I. Bryzgunov, A. V. Bubley, V. K. Gosteev, V. V. Parkhomchuk, V. B. Reva BINP SB RAS, Novosibirsk
	Cooler magnetic system for COSY is described. Electron beam energy range is wide (24 keV- 2 MeV), typical bending radiuses of electrons are near 1 m, typical magnetic fields are 0.5 – 2 kG. Under such conditions transport channels with longitudinal magnet field for motion of electrons from high voltage terminal of cascade transformer into cooling section and their return for recuperation are discussed. Results of Hall device measurements are compared with suitable computations. Also some steps were taken for improve of the magnetic field line straightness in the cooling section.
TUPS11	Superconducting Shield for Solenoid of Electron Cooling System	electron, power-supply, vacuum, collider	118
	A. V. Smirnov, N. N. Agapov, D. E. Donets, V. M. Drobin, S. Kulikov, R. Pivin, G. V. Trubnikov JINR, Dubna, Moscow Region G. L. Dorofeev RRC, Moscow
	The homogeneity of the magnetic field in the straight solenoid of the electron cooling system is the very important task. The superconducting solenoids are planned for electron cooling systems of collider rings of NICA project. To reach the necessary homogeneity in the straight section the superconducting shield was proposed. The experimental and numerical investigations of the field homogeneity with the superconducting shield are presented.
TUPS16	An Improved Forward Travelling Wave Structure Design for Stochastic Cooling at Experimental Cooler Storage Ring (CSRe) at the Institute of Modern Physics (IMP) in China	pick-up, impedance, kicker, storage-ring	132
	Y. Zhang, J. X. Wu IMP, Lanzhou F. Caspers, L. Thorndahl CERN, Geneva T. Katayama, F. Nolden GSI, Darmstadt
	An improved forward travelling wave (TW) structure as the pick-up/kicker is designed for the stochastic cooling to match the field wave’s (phase) velocity to that of the beam. The theoretical analysis is performed together with the simulations of the propagation characteristics. Using CST Microwave Studio (CST MWS), the simulated results, including phase velocity, characteristics impedance, and distributions of the longitudinal fields, are implemented and compared with the experimented results. The improved forward TW structure can be satisfied the requirements of stochastic cooling project at CSRe, which the phase velocity is closed to 0.70 (matching the desired beam energy of 400 MeV/u) and the characteristics impedance is 17 ohm.
TUPS19	Simulation Study of Barrier Bucket Accumulation with Stochastic Cooling at the GSI ESR	accumulation, electron, injection, kicker	136
	T. Katayama, F. Nolden, G. Schreiber, M. Steck GSI, Darmstadt T. Kikuchi Nagaoka University of Technology, Nagaoka, Niigata H. Stockhorst FZJ, Jülich
	The beam accumulation experiments with use of barrier bucket cavity and stochastic cooling was successfully performed at the ESR, GSI. The two methods of barrier voltage operation, moving barrier and fixed barrier cases were tried, and for some cases the electron cooling was additionally employed as well as the stochastic cooling. In the present paper, the beam accumulation process are simulated with particle tracking method where the cooling force (stochastic and electron cooling), the diffusion force and the barrier voltage force are included as well as the IBS diffusion effects. The simulation results are well in agreement with the experimental results.