Pavel Belochitskii

CERN | CERN · Beams Department (BE)

The CERN Antiproton Decelerator (AD) provides antiproton beams with a kinetic energy of 5.3 MeV to an active user community. The experiments would profit from a lower beam energy, but this extraction energy is the lowest one possible under good conditions with the given circumference of the AD. The Extra Low Energy Antiproton ring (ELENA) is a smal...

The Extra Low Energy Antiproton ring (ELENA) is a CERN project aiming at constructing a 30 m circumference synchrotron to further decelerate antiprotons from the Antiproton Decelerator (AD) from 5.3 MeV to 100 keV. The additional deceleration complemented by an electron cooler to reduce emittances will allow the existing AD experiments to increase...

The Extra Low Energy Antiproton ring (ELENA) is a CERN project aiming at constructing a 30 m circumference synchrotron to further decelerate antiprotons from the Antiproton Decelerator (AD) from 5.3 MeV to 100 keV. The additional deceleration complemented by an electron cooler to reduce emittances will allow the existing AD experiments to increase...

ELENA will lower the energy of AD antiprotons from 5MeV to 100keV, thus increasing by a factor of up to 100 the number of antiprotons usable by the experiments (Oelert et al. 2014). The AD infrastructures must be adapted to cope with another 20 years of low energy antiproton physics. To fit the ELENA ring in the already crowded AD hall, old kicker...

This Report gives a full description of the ELENA Ring to be built within the circumference of the Antiproton Decelarator (AD) Ring, in Building 193 at CERN. The ELENA ring will further decelerate the antiprotons coming from the AD at the momentum of 100 MeV/c down to 13.7 MeV/c, which corresponds to the kinetic energy of 100 keV before extracting...

At the last LEAP conference in Vancouver 2011 the authors stated that a project "ELENA", as an abbreviation for Extra Low ENergy Antiproton ring and as first discussed in 1982 for LEAR by H. Herr et al., was freshly proposed with a substantial new design and revised layout and that it was under consideration to be built at CERN. ELENA is an upgrade...

Low energy antiprotons are available for physics experiments at CERN since the 1980s and have been used by a large variety of experiments. The Low Energy Antiproton Ring LEAR has been constructed as a complementary use of antiprotons available at that time for high energy physics and delivered beam to experiments mainly using slow extraction. After...

The Extra Low Energy Antiproton ring (ELENA) is a small ring at CERN which will be built to increase substantially the number of usable (or trappable) antiprotons delivered to experiments for studies with antihydrogen and antiprotonic nuclei. The report shows the progress in the ELENA design. The choice of optics and ring layout inside the AD hall...

The CERN’s Antiproton Decelerator (AD) is devoted to special experiments with low energy antiprotons. A main topic is the antihydrogen production with the present aim to produce these antimatter atoms with such low energy that they can be trapped in a magnetic gradient field. First very convincing results have been published recently by ALPHA. Stil...

Successful commissioning of the CERN Antiproton Decelerator (AD) in 2000 was followed by significant progress in the creation of anti-hydrogen atoms. The extraction energy of the decelerated antiprotons is nevertheless very high compared to that required by the experiments and results in a trapping efficiency of only 0.1% to 3%. To improve this val...

The Extra Low ENergy Antiproton ring (ELENA) project started in June 2011 and is aimed at substantially increasing the number of antiprotons delivered to the Antiproton Decelerator (AD) physics community. ELENA will be a small machine that receives antiprotons from AD at 5.3 MeV kinetic energy and decelerates them further down to 100 keV. It will b...

To produce dense pbar beams at very low energies (100-200 keV), a small decelerator ring could be built and installed between the existing AD ring and the experimental area. Phase-space blowup during deceleration would be compensated by electron cooling in order to obtain final emittances comparable to the 5MeV beam presently delivered by the AD. T...

The Low Energy Ion Ring (LEIR) is a central piece of the injector chain for LHC ion operation, transforming long Linac 3 pulses into high density bunches needed for LHC. LEIR commissioning is scheduled to be completed at the time of the conference. A review of LEIR commissioning highlighting expected and unexpected problems and actions to tackle th...

The Antiproton Decelerator (AD) at CERN operates for physics since 1999. The 3.5 GeV/c antiprotons produced in the target by a 26 GeV/c proton beam coming from CERN PS. Since the experiments need a low energy antiprotons, beam is decelerated in the AD down to an extraction momentum of 100 MeV/c. Due to significant emittance blow up during decelerat...

The Low Energy Ion Ring (LEIR) is a low energy ion cooling and accumulation ring and serves to compress long ion pulses from Linac3 into high density bunches suitable for LHC ion operation. Issues of the LEIR lattice are to fulfil all constraints with a small number of quadrupoles and compensations of perturbations due to an electron cooler and gra...

The project DELSY is under development at JINR. It is based on an accelerator facility presented to JINR by the Institute for Nuclear and High Energy Physics (NIKHEF, Amsterdam): linear accelerator MEA and electron storage ring. Analysis has shown that it would be possible to build in Dubna a universal light source with unique characteristics consi...

After 3 years of operation, the antiproton decelerator performance is close to the design specifications. A review of the improvements over the years is given, along with results of machine development sessions that have taken place at regular intervals. An outlook for 2003 with details of planned and possible changes is also presented.

The DELSY (Dubna Electron Synchrotron) project is under development at the Joint Institute for Nuclear Research [Arkhipov et al. (2001). Nucl. Instrum. Methods, A467, 57-62; Arkhipov et al. (2001). Nucl. Instrum. Methods, A470, 1-6; Titkova et al. (2000). Proceedings of the Seventh European Particle Accelerator Conference, pp. 702-704]. It is based...

The project DELSY is being under development at JINR, Dubna, Russia. This synchrotron radiation source is dedicated to the investigation on condensed matter physics, atomic physics, biology, medicine, chemistry, micromechanics, lithography and others. The storage ring DELSY is an electron storage ring with the beam energy 1.2 GeV and 4 straight sec...

To provide efficient deceleration and to produce antiproton beam with the required characteristics two different cooler systems (stochastic and electron) are used in operation on the AD (Antiproton Decelerator) machine. In a near future, an electron cooling system will be used in LEIR (Low Energy Ion Ring) to accumulate ions for LHC. This system wi...

The project "Dubna Electron Synchrotron" (DELSY) is aimed to construct a synchrotron radiation source of the third generation at the Joint Institute for Nuclear Research. The DELSY synchrotron radiation source will be constructed on the base of the accelerator facility of the Institute for Nuclear Physics and High Energy Physics (NIKHEF), Amsterdam...

The Antiproton Decelerator (AD) is a simplified source of antiprotons which provides low energy antiprotons for experiments, replacing four machines: AC (Antiproton Collector), AA (Antiproton Accumulator); PS and LEAR (Low Energy Antiproton Ring), shutdown in 1996. The former AC was modified to include deceleration and electron cooling. The AD star...

The former Antiproton Collector (AC) at CERN has been transformed into an Antiproton Decelerator (AD) to supply high quality antiproton beams with a momentum of 100 MeV/c (kinetic energy of 5.3 MeV). As in AC, antiprotons are injected at 3.57 GeV/c and cooled by stochastic cooling system. To facilitate the deceleration and to prepare a small emitta...

The project DELSY, a 1.2 GeV synchrotron radiation source is under development at JINR, Dubna, Russia. This source is dedicated to investigations on condensed matter physics, atomic physics, biology, medicine, chemistry, micromechanics, lithography and others. For the DELSY storage ring the layout with four straight sections was chosen. Every quadr...

The project “Dubna Electron Synchrotron” aims to construct a synchrotron radiation source of the third generation at the Joint Institute for Nuclear Research, Dubna, Russia.

The review on a source of synchrotron hard X-ray and coherent infrared radiation at JINR is presented. The requirements on the SR source and on the accelerating complex are given. The structure scheme of the SRS is described. The preliminary calculations of the QBA lattice of the main ring are performed.

In 1997 LEP will enter its third phase and will be operated at energies well above 90 GeV. In order to reach the required luminosities at these higher energies, i.e., to reach the maximum beam-beam tune-shift parameter, an optics with a small horizontal emittance is desirable. Such a lattice must have a dynamic aperture sufficient to guarantee the...

The deceleration of the beam down to 0.1 GeV/c in the ring previously used as Antiproton Collector (AC) at 3.5 GeV/c, requires a number of modifications to the lattice. The insertion of the electron cooling, needed to cool the antiproton beam at low energy, implies the re-arrangement of quadrupoles. The optical functions then need to be readjusted...

Magnet lattice designs of tau-charm collider, based on use of TBA and DBA cells in arcs are consideredr. To fulfil re- quirements of tau-charm physics each lattice provides two modes of collider operation. One uses conventional scheme at interaction point and needs in high emittance. Other pro- vides monochromatization at interaction point and requ...

At present there am several proposals for magnet lattices suitable for the standard and monochromatization regimes for a tau-charm factory. The main features of the design using a versatile lattice are discussed. Beam and machine parameters and a short description of some factory systems are presented to illustrate the design feasibility

Results of a JINR tau-charm conceptual study are given. The general considerations regarding the storage ring and accelerator complex in JINR, the tau-charm factory injector system and the main ring, the principles and the parameter estimation to achieve high luminosity are examined. The approximate cost of the tau-charm factory in JINR using the i...

DELSY, a 1.2 GeV synchrotron radiation source is planned to be constructed at JINR, Dubna, Russia. This source is dedicated to the investigations on condensed matter physics, atomic physics, biology, medicine, chemistry, micromechanics, lithography and others. For DELSY the layout with four straight sections was chosen. Every quadrant consists of M...

Russian Institute of Powerful Radioconstruction, St. Petersburg, Russia

The Low Energy Ion Ring (LEIR) is a central piece for LHC ion operation at CERN, transforming long Linac3 pulses into high density bunches needed for LHC. The first phase of LEIR commissioning successfully attained its goal of providing the so-called "early ion beam" (one bunch of 2.25 108 Lead ions) needed for the first LHC ion runs with reduced l...

In late 1996, LEP was operated at 86 GeV with a low-emittance optics that had phase advances of (108^circ,90^circ) in the arc cells. The measured dynamic aperture turned out to be smaller than predicted. The classical experimental technique of kicking the beam, measuring losses and recording its turn-to-turn motion with the beam position monitors w...

The Antiproton Decelerator (AD) at CERN operates for physics since 2000 [1]. It delivers low energy antiprotons for production and study of antihydrogen, for atomic physics and for medical research. Two beam cooling systems, stochastic and electron, play key roles in AD operation. They make beam transverse and longitudinal emittances small, which i...

The CERN Antiproton Decelerator (AD) is a simplified source providing low energy antiprotons for experiments, replacing four machines: AC (Antiproton Collector), AA (Antiproton Accumulator), PS and LEAR (Low Energy Antiproton Ring), shut down in 1996. The former AC was modified to include deceleration, electron cooling and ejection lines into the n...

The antiproton decelerator (AD) has been running successfully for physics for the past two years. After the end of the commissioning period [1] that finished in 2000, the machine has gradually been improved. The main efforts were concentrated on increasing the beam intensity, reducing the cycle length and improving the machine stability. The intens...

The commissioning of CERN's ion injector complex [1] to allow 1.1 PeV collisions of ions in LHC is well under way. After the Low Energy Ion Ring (LEIR) in 2005 [2] and the Proton Synchrotron (PS) in 2006 [3], the Super Proton Synchrotron (SPS) has now been commissioned with the 'Early' ion beam, which should give a luminosity of $5×10^{25}cm^{-2}s^...

To produce dense antiproton beams at very low energies (100 keV), it has been proposed to install a small decelerator ring between the existing AD ring and the experimental area. Phase-space blowup during deceleration is compensated by electron cooling such that the final emittances are comparable to the 5MeV beam presently delivered by the AD. An...