lattice

Paper	Title	Other Keywords	Page
TUCHX02	Present Status of VEPP-2000	optics, luminosity, betatron, resonance	1
	D. B. Shwartz, D. E. Berkaev, A. N. Kirpotin, I. Koop, A. P. Lysenko, I. Nesterenko, E. Perevedentsev, Yu. A. Rogovsky, A. L. Romanov, P. Yu. Shatunov, Y. M. Shatunov, A. N. Skrinsky, I. Zemlyansky BINP SB RAS, Novosibirsk
	VEPP-2000 electron-positron collider has been completed in the Budker INP in 2007. First beam was captured in a special lattice with switched off final focus solenoids. This regime is used for all machine subsystems test and calibration as well as vacuum chamber treatment by synchrotron radiation with electron beam current up to 150 mA. Another special low-beta lattice with solenoids switched on partially was used for the first test of the round beam option at the energy of 508 MeV. Studies of the beam-beam interaction were done in "weak-strong" and "strong-strong" regimes. Measurements of beam sizes in the both cases have indicated beam behaviour similar to expectations for the round colliding beams. Also the first collider energy calibration at the phy-meson resonance was performed with SND detector. Since the end of 2009 VEPP-2000 started first experimental work with both particle detectors SND and CMD-3 at the energies of 500-950 MeV range with the lattice mode close to project.
	Slides
TUCHB03	Optics Design for NICA Collider	collider, optics, proton, emittance	17
	S. A. Kostromin, O. S. Kozlov, I. N. Meshkov, V. A. Mikhaylov, A. O. Sidorin JINR, Dubna, Moscow Region A. Bolshakov, P. Zenkevich ITEP, Moscow V. A. Lebedev, S. Nagaitsev Fermilab, Batavia Y. Senichev FZJ, Jülich
	The Nuclotron-based Ion Collider fAcility (NICA) is a new accelerator complex being constructed at JINR collider experiments with ions at maximum energy (center of mass) SNN(1/2) ~ 11GeV/u. Collider ring has to provide ion-ion and ion-proton collisions in energy range 1-4.5 GeV/u and collisions of polarized proton-proton and deuteron-deuteron beams. Collider conceptions with constant gammatr and with possibility of its variation are considered. In the ring with changeable gammatr the optics design should allow to work with gammatr ~40 for protons mode as well as with γtr in range 3-11 for ions mode. The NICA has the racetrack shape (circumference ~450m) with two arcs and two straight sections which optimized to have betta*~35cm in two IPs. Duality of optics adjustable for different energy and different particles puts the special requirements on the arc and straight sections. Suppressing of rather high normalized chromaticity with changeable tune compels us to use the multi-family sextupole scheme. Three variants of the ring optics (based on FODO-cells, ODFDO-cells) were tested to provide acceptable IBS-time. Final version of the lattice is under discussion.
	Slides
TUPSA001	Compensation of Nonlinearities in NICA Collider Optics	sextupole, collider, proton, dynamic-aperture	35
	S. A. Kostromin, O. S. Kozlov, I. N. Meshkov, V. A. Mikhailov, A. O. Sidorin, G. V. Trubnikov JINR, Dubna, Moscow Region V. A. Lebedev Fermilab, Batavia Y. Senichev FZJ, Jülich
	Intra-beam scattering is the limiting factor of the luminosity lifetime for Nuclotron-based Ion Collider fAcility (NICA). To minimize IBS growth the dispersion should be lowered as much as possible. Due to this fact and rather long dispersionless straight sections with two IPs the normalized chromaticity reaches a high value ~4. Therefore the strong chromatic sextupoles magnets on arcs are required which in turn bring significant non-linear distortions in beam dynamics. Different schemes involving several families of sextupoles and are tested. Optimization of the chromaticity correction scheme was carried out to increase the dynamic aperture. Use of octupole correctors was studied to compensate the nonlinearities from sextupole magnets and minimize the non-linear tune shift in region of beam. Obtained design of the NICA collider lattice was used for the long term tracking to understand the beam transverse parameters behavior.
WECHC02	Electrostatic Storage Rings at the Ultra-low Energies Range	ion, storage-ring, antiproton, electron	169
	A. I. Papash JINR, Dubna, Moscow Region C. P. Welsch The University of Liverpool, Liverpool
	Electrostatic storage rings have proven to be invaluable tools for atomic and molecular physics at the ultra-low energy range from 1 to 100 keV/A. Due to the mass independence of the electrostastic rigidity, these machines are able to store a wide range of different particles, from light ions to heavy singly charged bio-molecules. Reaction Microscope incorporated into a ring lattice is considered to be a new powerful tool to study high precision effects by multiple crossing of incident beam of ions with ultrasonic gas jet. To enable operation of Reaction Microscope one should provide very short bunches in the 1-2 nanosecond regime in order to pave the way for kinematically complete measurements of the collision dynamics of fundamental few-body quantum systems on the level of differential cross sections. However, earlier measurements at some rings showed strong limitations depending on beam intensity, probably linked to non-linear fields that cannot be completely avoided in such machines. In this contribution, we discuss common features of electrostatic storage rings and analyse rings performance.
	Slides
WEPSB012	Method to Estimate the Beam and Structure Parameters for the Dispersion Accelerator Parts	emittance, linac, quadrupole, coupling	193
	V. A. Moiseev RAS/INR, Moscow
	The beam dynamics parameters as the transverse emittance information, momentum spread and structure characteristics are determined by treatment of the small number of profile measurements for the dispersion accelerator parts. The reliability of measurements is estimated.
WEPSB014	Examination of Charged Particle Dynamics Through Employment of the Fourier Series	quadrupole, focusing, undulator, betatron	199
	O. E. Shishanin MSIU, Moscow
	In some papers we have considered an influence of the betatron oscillations on synchrotron radiation properties. To obtain uninterrupted solution for the Hill equation, in this case the transverse components of magnetic field were expanded in a Fourier series. This approach was usefully employed and posed problem was resolved in focusing periodic magnetic fields. Using this scheme, the equations of oscillations were also derived for storage rings. It was published in Proceedings of RuPAC2008. The procedure may even work for the various types of wigglers and undulators where the dynamics of particles can be described more precisely with regard to the concrete field inside a single magnet and their arrangement as a whole.
WEPSB017	Space Charge Simulation Using MADX with Account of Synchrotron Oscillations	simulation, emittance, space-charge, extraction	204
	V. V. Kapin MEPhI, Moscow Y. Alexahin Fermilab, Batavia
	Direct space charge forces can be simulated with the 6D beam dynamics code MADX using a number of 4D BEAMBEAM elements with Gaussian transverse profile for charge density. To take into account effects of synchrotron oscillations on space charge forces, the amplitude of BEAMBEAM elements is modulated according to the distance between a particle and the bunch center assuming Gaussian longitudinal profile. Parameters of every BEAMBEAM element (charge and sizes) are defined by local values of beta-function and dispersion, while they are updated according to the beam intensity and beam emittances at every turn. MADX script accomplishing this method has been written for the lattice of the existing Debuncher ring. The slow extraction at the 3rd order resonance with simultaneously varying the horizontal tune and the sextupole strength is considered as one of the options for Debuncher to be used in the "mu2e" project. Our MADX simulation results are compared with results obtained by V. Nagaslaev (FNAL) using the particle-in-cell ORBIT-code. The evolutions of the phase-spaces and the beam intensity within ten thousands turns have shown a good agreement between the MADX and ORBIT results.