optics

Paper	Title	Other Keywords	Page
TUCHX02	Present Status of VEPP-2000	lattice, 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, lattice, 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
TUPSA028	Calibration of the Electrostatic Beam Position Monitors for VEPP-2000	vacuum, pick-up, electron, 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.
TUPSA031	Profiles and Intensities Measurments in the Diagnostic System of the Extracted Beams of the U-70 Accselerator	diagnostics, controls, proton	107
	A. Y. Sotnikov, N. Ivanova, A. V. Koshelev, V. Kovaltsov, A. Lukyantsev, S. Makonin, A. Matyushin, V. Milyutkin, V. S. Seleznev IHEP Protvino, Protvino, Moscow Region
	Diagnostic system for the extracted beams of the U-70 accelerator is a hardware-software complex with profilometers and electronic crates at the lower level, VME-crates with ADC-modules and MVME-167 processors (vxWorks operating system, basic EPICS tools, home made software) at the middle level, personal computers used as workstation at the upper level. In this report we consider: - the approaches to the system adaptation problems during the U-70 runs and solutions to these problems; - data acquisition and hardware-sofware levels of data processing for non-standard profilometers; - the tools for the beam intensity measurement and presentation, the intensimeter calibration procedure.
WEPSB033	User Interface in the Diagnostic System of the Extracted Beams of the U-70 Accselerator	diagnostics, controls, site	242
	A. Y. Sotnikov, N. Ivanova, A. V. Koshelev, V. Kovaltsov, A. Lukyantsev, V. Milyutkin, Y. N. Smirnov IHEP Protvino, Protvino, Moscow Region
	User interface in the diagnostic system of extracted beams is described. It was developed under Linux operating system on the personal computers used as workstations. The considered program tools provide: - the representation on operator consoles (workstations) information about beam profiles, intensity, displacement, root-mean-square error etc. in different forms; - the dynamic adjustment of the diagnostic system; - web presentation of the currrent information about the extracted beams; - data transfer to physical setups; - special beam characteristics calculation by the profilometer individual units data (for research purposes); - data archiving and web facilities for data viewing.