IPAC2012 - List of Keywords (antiproton)

Paper	Title	Other Keywords	Page
MOPPC060	Investigations into Beam Life Time in Low Energy Storage Rings	ion, target, storage-ring, electron	271
	A.I. Papash, A.V. Smirnov MPI-K, Heidelberg, Germany A.I. Papash JINR, Dubna, Moscow Region, Russia C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom
	Funding: Work supported by the Helmholtz Association of National Research Centers and GSI under contract VH-NG-328. In low energy storage rings, beam life time critically depends on the residual gas pressure, scattering effects caused by in-ring experiments and the available machine acceptance. A comprehensive simulation study into these effects has been realized with a focus on the TSR storage ring in Heidelberg and the electrostatic rings ELISA, the AD recycler and the ultra-low energy storage ring (USR). This was done by using the computer code BETACOOL in combination with the OPERA-3D and MAD-X programs. In this contribution, the results from these studies are presented and compared to available experimental data. Based on these simulations, criteria for stable ring operation are then presented.

MOPPC061	An Antiproton Recycler for Atom-Antiproton Collision Experiments	injection, ion, acceleration, target	274
	M.R.F. Siggel-King, C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom O. Karamyshev, A.I. Papash MPI-K, Heidelberg, Germany M.R.F. Siggel-King The University of Liverpool, Liverpool, United Kingdom
	Funding: Work supported by the Helmholtz Association and GSI under contract VH-NG-328, the EU under contract PITN-GA-2008-215080 and STFC. Collision experiments with low energy antiprotons and different gas jet targets on the level of differential cross sections would be very desirable to use to investigate the details of this fundamental process. At present, such experiments are, however, not feasible, since the only source of antiprotons in the world, the AD at CERN, cannot provide beams of the required energy and quality. A small electrostatic ring has been designed and developed by the QUASAR Group. Serving at the same time as a prototype for the future ultra-low energy storage ring (USR), to be integrated at the facility for low-energy antiproton and ion research (FLAIR), this small accelerator is unique due to its combination of size, electrostatic nature, and energy of the circulating particles. In this contribution, the design of the ring is described in detail and possible operation scenarios in the ASACUSA beam line and behind the ELENA ring are compared with each other.

MOPPD001	Accelerator R&D in the QUASAR Group	diagnostics, storage-ring, niobium, instrumentation	364
	C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom C.P. Welsch The University of Liverpool, Liverpool, United Kingdom
	Funding: Work supported by the Helmholtz Association and GSI under contract VH-NG-328, the EU under contracts PITN-GA-2008-215080, PITN-GA-2011-289191, PITN-GA-2011-289485 and STFC. The QUASAR Group was founded in 2007 with an initial focus on the development and experimental exploitation of a novel electrostatic ultra-low energy storage ring (USR), part of the future facility for low-energy antiproton and ion research (FLAIR). The group's research activities have grown considerably over the past four years and now include also the development of beam diagnostic tools for accelerators and light sources, investigations into superconducting linear accelerators and medical applications, and, most recently, a broad R&D program into laser applications at accelerators. In this contribution, an overview of the QUASAR Group’s research achievements to date is given.

MOPPD002	Ultra-low Energy Storage Ring at FLAIR	extraction, storage-ring, ion, lattice	367
	C.P. Welsch, D. Newton, M.R.F. Siggel-King Cockcroft Institute, Warrington, Cheshire, United Kingdom O.E. Gorda, O. Karamyshev, G.A. Karamysheva, M. Panniello, A.I. Papash, A.V. Smirnov MPI-K, Heidelberg, Germany J. Harasimowicz, M. Putignano, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom
	Funding: The support of the HGF and GSI under contract VH-NG-328, the EU under contract PITN-GA-2008-215080, the Max Planck Institute for Nuclear Physics and the STFC Grant ST/G008248/1 is acknowledged. The Ultra-low energy electrostatic Storage Ring (USR) at the future Facility for Low-energy Antiproton and Ion Research (FLAIR) will provide cooled beams of antiprotons in the energy range between 300 keV down to 20 keV. Based on the original design concept developed in 2005, the USR has been completely redesigned over the past few years. The ring structure is now based on a 'split achromat' lattice. This ensures compact ring dimensions of 10 x 10 m, whilst allowing both, in-ring experiments with gas jet targets and studies with extracted beams. In the USR, a wide range of beam parameters will be provided, ranging from very short pulses in the nanosecond regime to a coasting beam. In addition, a combined fast and slow extraction scheme was developed that allows for providing external experiments with cooled beams of different time structure. Furthermore, studies into beam diagnostics methods for the monitoring of ultra-low energy ions at beam intensities less than 10⁶ were carried out. Here, we present the USR design with an emphasis on the expected beam parameters available to the experiments at FLAIR.

MOPPD005	Stochastic Cooling of Antiprotons in the Collector Ring at FAIR	pick-up, kicker, simulation, ion	376
	C. Dimopoulou, A. Dolinskii, F. Nolden, C. Peschke, M. Steck GSI, Darmstadt, Germany
	In order to reach the required luminosities for the experiments at FAIR, the hot secondary beams (antiprotons or rare isotopes) emerging from the production targets will be efficiently collected and phase-space cooled in the large-acceptance Collector Ring (CR), which is equipped with pertinent stochastic cooling systems. Simulations of the system performance are underway in parallel with the finalization of the system design. After an overview of the CR stochastic cooling systems, simulation results for antiproton cooling in the bandwidth 1-2 GHz are presented. The CERN Fokker-Planck code is used for momentum cooling and an analytical model based on "rms" theory for the simultaneous betatron cooling. In the focus is the comparison between the time of flight and the notch filter momentum cooling methods. The results are essential for system optimization as well as input for the users of the CR-precooled beams i.e. the HESR.

MOPPR012	Beam Induced Fluorescence Monitors for FAIR	vacuum, electron, ion, target	798
	F. Becker, C.A. Andre, C. Dorn, P. Forck, R. Haseitl, B. Walasek-Höhne GSI, Darmstadt, Germany T. Dandl, T. Heindl, A. Ulrich TUM/Physik, Garching bei München, Germany
	Online profile diagnostic is preferred to monitor intense hadron beams at the Facility of Antiproton and Ion Research (FAIR). One instrument for beam profile measurement is the gas based Beam Induced Fluorescence (BIF)-monitor. It relies on the optical fluorescence of residual gas, excited by beam particles. Depending on the beam parameters and vacuum constraints, BIF monitors can be operated at base pressure or in dedicated local pressure bumps. Spectroscopic data in nitrogen and rare gases confirms an exploitable dynamic range from UHV to atmospheric pressure. Optical transitions and corresponding beam profiles are discussed for gas pressures from 10^-3 to 30 mbar. Fundamental limitations for some application scenarios will be addressed as well.

TUOBA01	Summary of Fermilab’s Recycler Electron Cooler Operation and Studies	electron, emittance, ion, extraction	1068
	L.R. Prost, A.V. Shemyakin Fermilab, Batavia, USA
	Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy. Fermilab’s Recycler ring was used as a storage ring for accumulation and subsequent manipulations of 8 GeV antiprotons destined for the Tevatron collider. To satisfy these missions, a unique electron cooling system was designed, developed and successfully implemented. The most important features that distinguish the Recycler cooler from other existing electron coolers are its relativistic energy (it employs a 4.3 MeV, 0.1 A DC electron beam), a weak continuous longitudinal magnetic field in the cooling section (~100 G), and lumped focusing elsewhere. With the termination of the collider operation at Fermilab, the cooler operation was also terminated. In this article, we will summarize the experience of commissioning, optimizing and running this unique machine over the 6 years of its existence.
	Slides TUOBA01 [2.503 MB]

TUPPR086	Transport from the Recycler Ring to the Antiproton Source Beamlines	proton, kicker, booster, extraction	2026
	M. Xiao Fermilab, Batavia, USA
	In the post-Nova era, the protons are directly transported from the Booster ring to the Recycler ring rather than the Main Injector. For Mu2e and g-2 project, the Debuncher ring will be modified into a Delivery ring to deliver the protons to both Mu2e and g-2 experiemnts. Therefore, It requires the transport of protons from the Recycler Ring to the Delivery ring. A new transfer line from the Recycler ring to the P1 beamline will be constructed to transport proton beam from the Recycler Ring to existing Antiproton Source beamlines. This new beamline provides a way to deliver 8 GeV kinetic energy protons from the Booster to the Delivery ring, via the Recycler, using existing beam transport lines, and without the need for new civil construction. This paper presents the Conceptual Design of this new beamline.

WEOBA02	Tevatron End-of-Run Beam Physics Experiments	proton, emittance, dipole, luminosity	2128
	A. Valishev Fermilab, Batavia, USA X. Gu, R. Miyamoto, S.M. White BNL, Upton, Long Island, New York, USA J. Qiang LBNL, Berkeley, California, USA F. Schmidt CERN, Geneva, Switzerland
	Funding: Fermi Research Alliance, LLC operates Fermilab under Contract DE-AC02-07CH11359 with the US Department of Energy. This work was partially supported by the US LHC Accelerator Research Program (LARP). Before the Tevatron collider Run II ended in September of 2011, a two-week period was devoted to the experiments on various aspects of beam-beam interactions. The studied topics included offset collisions, coherent beam stability, effect of the bunch-length-to-beta-function ratio, and operation of AC dipole with colliding beams. In this report we summarize the results of beam experiments and supporting simulations.
	Slides WEOBA02 [1.382 MB]

WEPPD030	Concept for the Antiproton Production Target at FAIR	target, proton, synchrotron, radiation	2570
	K. Knie, B. Franzke, V. Gostishchev, M. Steck GSI, Darmstadt, Germany P. Sievers CERN, Geneva, Switzerland
	We will report on the status of the antiproton production target for the FAIR facility. A Ni target will be bombarded by a pulsed beam of 29 GeV protons with an intensity of 2.5·10¹³ ppp and a repetition rate of 0.2 Hz. Directly after the target the antiprotons will be focussed by a magnetic horn. In the proceeding magnetic separator antiprotons with an energy of 3 GeV (± 3%) will be selected and transported to the antiproton collector ring. The planned setup of the target area, including radiation protection issues, will be presented,

WEPPD072	Frequency Fine-tuning of a Spin-flip Cavity for Antihydrogen Atoms	cavity, resonance, coupling, vacuum	2690
	S. Federmann, F. Caspers, E. Mahner CERN, Geneva, Switzerland B. Juhasz, E. Widmann SMI, Vienna, Austria
	As part of the ASACUSA collaboration physics program a spin-flip cavity for measurements of the ground-state hyperfine transition frequency of anti-hydrogen atoms is needed. The purpose of the cavity is to excite anti-hydrogen atoms depending on their polarisation by a microwave field operating at 1.42 GHz. The delicacy of designing such a cavity lies in achieving and maintaining the required properties of this field over a large aperture of 10cm and for a long period of time (required amplitude stability is 1% within 12h). The present paper presents the frequency fine tuning techniques to obtain the desired centre frequency of 1.42 GHz with a Q value below 500 as well as the tuning circuit used for the frequency sweep over the desired bandwidth of 6 MHz.

THPPP002	Operation of the HESR Storage Ring of the FAIR Project with Ions and Rare Isotopes	ion, target, electron, storage-ring	3722
	M. Steck, C. Dimopoulou, A. Dolinskii, T. Katayama, Yu.A. Litvinov, T. Stöhlker GSI, Darmstadt, Germany R. Maier, D. Prasuhn, H. Stockhorst FZJ, Jülich, Germany
	The HESR storage ring of the FAIR project is designed for experiments with cooled antiprotons. The HESR receives pre-cooled antiprotons from the Collector Ring CR which is also designed for cooling of rare isotope beams. The magnetic rigidity of 13 Tm is the same for the pre-cooling of antiprotons and rare isotopes in the CR. Therefore the transfer of ions or rare isotopes from the CR to the HESR can be performed under similar condition, except the different polarity of the magnetic components. This is an option for the first stage of the FAIR project when no other storage ring is available for experiments with stored ions. In the HESR the ions can be decelerated or accelerated, like the antiprotons, to energies corresponding to the magnetic rigidity range from 5 to 50 Tm. The planned beam cooling systems of the HESR, stochastic and electron cooling, can be applied to improve the quality of the ion beams in the HESR and support experiments using an internal target or the accumulation of rare isotope beams in the HESR. Scenarios for operating the HESR with ions and rare isotopes as well as achievable performance, beam intensity and quality for internal experiments will be discussed.

THPPP008	The ELENA Project: Progress in the Design	extraction, electron, vacuum, emittance	3740
	T. Eriksson, W. Bartmann, P. Belochitskii, H. Breuker, F. Butin, C. Carli, R. Kersevan, M. Martini, S. Maury, S. Pasinelli, G. Tranquille CERN, Geneva, Switzerland W. Oelert Forschungszentrum Jülich GmbH, Institut fur Nuklearchemie (INC), Jülich, Germany
	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 be equipped with an electron cooler to avoid beam losses during deceleration and to reduce beam phase space at extraction. Design work is progressing with emphasis on machine parameters and design as well as infrastructure, ring, transfer lines and vital subsystem design.

THPPP017	ELENA: From the First Ideas to the Project	electron, extraction, rfq, vacuum	3764
	G. Tranquille, P. Belochitskii, T. Eriksson, S. Maury CERN, Geneva, Switzerland W. Oelert Forschungszentrum Jülich GmbH, Institut fur Nuklearchemie (INC), Jülich, Germany
	Successful commissioning of the CERN Antiproton Decelerator (AD) in 2000 was followed by significant progress in the creation of antihydrogen atoms. The extraction energy of the decelerated antiprotons is nevertheless very high compared to that required by experiments and results in a trapping efficiency of only 0.1% to 3%. To improve this value by an order of magnitude the study of an Extra Low ENergy Antiproton ring (ELENA) started in 2003 and was approved as a CERN construction project in 2011. During these years the choice of the main machine parameters such as the beam extraction energy, emittance and bunch length were defined, taking into account requests from the physics community. The main challenges were also identified, such as dealing with the large space charge tune, the ultra high vacuum required and the tight requirements for the electron cooler. Housing the ELENA ring within the AD hall significantly reduced the project cost as well as simplifying the beam transfer from AD to ELENA and from ELENA to the existing experimental areas. This contribution will follow ELENA from its beginnings to the final, approved project proposal.

FRXCB01	Review of Microwave Schottky Beam Diagnostics	pick-up, proton, diagnostics, ion	4175
	R.J. Pasquinelli Fermilab, Batavia, USA
	Non-intercepting beam diagnostics for detection of the incoherent motion of the finite number of beam particles, i.e. Schottky beam monitors, have been proven as extremely useful to characterize tune, chromaticity, and momentum spread in circular accelerators and colliders. This beam instrument, based on advanced microwave techniques, operates successfully in Recycler and Tevatron, and was recently implemented in the Large Hadron Collider. This presentation should review the technology of Schottky beam diagnostics systems with an emphasis on initial deployment at the Tevatron, concluding with the latest measurement results from the LHC and an outlook of possible improvements and extensions of the diagnostics.
	Slides FRXCB01 [22.518 MB]

Paper

Title

Other Keywords

Page

MOPPC060

Investigations into Beam Life Time in Low Energy Storage Rings

ion, target, storage-ring, electron

271

A.I. Papash, A.V. Smirnov
MPI-K, Heidelberg, Germany
A.I. Papash
JINR, Dubna, Moscow Region, Russia
C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom

Funding: Work supported by the Helmholtz Association of National Research Centers and GSI under contract VH-NG-328.
In low energy storage rings, beam life time critically depends on the residual gas pressure, scattering effects caused by in-ring experiments and the available machine acceptance. A comprehensive simulation study into these effects has been realized with a focus on the TSR storage ring in Heidelberg and the electrostatic rings ELISA, the AD recycler and the ultra-low energy storage ring (USR). This was done by using the computer code BETACOOL in combination with the OPERA-3D and MAD-X programs. In this contribution, the results from these studies are presented and compared to available experimental data. Based on these simulations, criteria for stable ring operation are then presented.

MOPPC061

An Antiproton Recycler for Atom-Antiproton Collision Experiments

injection, ion, acceleration, target

274

M.R.F. Siggel-King, C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom
O. Karamyshev, A.I. Papash
MPI-K, Heidelberg, Germany
M.R.F. Siggel-King
The University of Liverpool, Liverpool, United Kingdom

Funding: Work supported by the Helmholtz Association and GSI under contract VH-NG-328, the EU under contract PITN-GA-2008-215080 and STFC.
Collision experiments with low energy antiprotons and different gas jet targets on the level of differential cross sections would be very desirable to use to investigate the details of this fundamental process. At present, such experiments are, however, not feasible, since the only source of antiprotons in the world, the AD at CERN, cannot provide beams of the required energy and quality. A small electrostatic ring has been designed and developed by the QUASAR Group. Serving at the same time as a prototype for the future ultra-low energy storage ring (USR), to be integrated at the facility for low-energy antiproton and ion research (FLAIR), this small accelerator is unique due to its combination of size, electrostatic nature, and energy of the circulating particles. In this contribution, the design of the ring is described in detail and possible operation scenarios in the ASACUSA beam line and behind the ELENA ring are compared with each other.

MOPPD001

Accelerator R&D in the QUASAR Group

diagnostics, storage-ring, niobium, instrumentation

364

C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom
C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom

Funding: Work supported by the Helmholtz Association and GSI under contract VH-NG-328, the EU under contracts PITN-GA-2008-215080, PITN-GA-2011-289191, PITN-GA-2011-289485 and STFC.
The QUASAR Group was founded in 2007 with an initial focus on the development and experimental exploitation of a novel electrostatic ultra-low energy storage ring (USR), part of the future facility for low-energy antiproton and ion research (FLAIR). The group's research activities have grown considerably over the past four years and now include also the development of beam diagnostic tools for accelerators and light sources, investigations into superconducting linear accelerators and medical applications, and, most recently, a broad R&D program into laser applications at accelerators. In this contribution, an overview of the QUASAR Group’s research achievements to date is given.

MOPPD002

Ultra-low Energy Storage Ring at FLAIR

extraction, storage-ring, ion, lattice

367

C.P. Welsch, D. Newton, M.R.F. Siggel-King
Cockcroft Institute, Warrington, Cheshire, United Kingdom
O.E. Gorda, O. Karamyshev, G.A. Karamysheva, M. Panniello, A.I. Papash, A.V. Smirnov
MPI-K, Heidelberg, Germany
J. Harasimowicz, M. Putignano, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom

Funding: The support of the HGF and GSI under contract VH-NG-328, the EU under contract PITN-GA-2008-215080, the Max Planck Institute for Nuclear Physics and the STFC Grant ST/G008248/1 is acknowledged.
The Ultra-low energy electrostatic Storage Ring (USR) at the future Facility for Low-energy Antiproton and Ion Research (FLAIR) will provide cooled beams of antiprotons in the energy range between 300 keV down to 20 keV. Based on the original design concept developed in 2005, the USR has been completely redesigned over the past few years. The ring structure is now based on a 'split achromat' lattice. This ensures compact ring dimensions of 10 x 10 m, whilst allowing both, in-ring experiments with gas jet targets and studies with extracted beams. In the USR, a wide range of beam parameters will be provided, ranging from very short pulses in the nanosecond regime to a coasting beam. In addition, a combined fast and slow extraction scheme was developed that allows for providing external experiments with cooled beams of different time structure. Furthermore, studies into beam diagnostics methods for the monitoring of ultra-low energy ions at beam intensities less than 10⁶ were carried out. Here, we present the USR design with an emphasis on the expected beam parameters available to the experiments at FLAIR.

MOPPD005

Stochastic Cooling of Antiprotons in the Collector Ring at FAIR

pick-up, kicker, simulation, ion

376

C. Dimopoulou, A. Dolinskii, F. Nolden, C. Peschke, M. Steck
GSI, Darmstadt, Germany

In order to reach the required luminosities for the experiments at FAIR, the hot secondary beams (antiprotons or rare isotopes) emerging from the production targets will be efficiently collected and phase-space cooled in the large-acceptance Collector Ring (CR), which is equipped with pertinent stochastic cooling systems. Simulations of the system performance are underway in parallel with the finalization of the system design. After an overview of the CR stochastic cooling systems, simulation results for antiproton cooling in the bandwidth 1-2 GHz are presented. The CERN Fokker-Planck code is used for momentum cooling and an analytical model based on "rms" theory for the simultaneous betatron cooling. In the focus is the comparison between the time of flight and the notch filter momentum cooling methods. The results are essential for system optimization as well as input for the users of the CR-precooled beams i.e. the HESR.

MOPPR012

Beam Induced Fluorescence Monitors for FAIR

vacuum, electron, ion, target

798

F. Becker, C.A. Andre, C. Dorn, P. Forck, R. Haseitl, B. Walasek-Höhne
GSI, Darmstadt, Germany
T. Dandl, T. Heindl, A. Ulrich
TUM/Physik, Garching bei München, Germany

Online profile diagnostic is preferred to monitor intense hadron beams at the Facility of Antiproton and Ion Research (FAIR). One instrument for beam profile measurement is the gas based Beam Induced Fluorescence (BIF)-monitor. It relies on the optical fluorescence of residual gas, excited by beam particles. Depending on the beam parameters and vacuum constraints, BIF monitors can be operated at base pressure or in dedicated local pressure bumps. Spectroscopic data in nitrogen and rare gases confirms an exploitable dynamic range from UHV to atmospheric pressure. Optical transitions and corresponding beam profiles are discussed for gas pressures from 10^-3 to 30 mbar. Fundamental limitations for some application scenarios will be addressed as well.

TUOBA01

Summary of Fermilab’s Recycler Electron Cooler Operation and Studies

electron, emittance, ion, extraction

1068

L.R. Prost, A.V. Shemyakin
Fermilab, Batavia, USA

Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.
Fermilab’s Recycler ring was used as a storage ring for accumulation and subsequent manipulations of 8 GeV antiprotons destined for the Tevatron collider. To satisfy these missions, a unique electron cooling system was designed, developed and successfully implemented. The most important features that distinguish the Recycler cooler from other existing electron coolers are its relativistic energy (it employs a 4.3 MeV, 0.1 A DC electron beam), a weak continuous longitudinal magnetic field in the cooling section (~100 G), and lumped focusing elsewhere. With the termination of the collider operation at Fermilab, the cooler operation was also terminated. In this article, we will summarize the experience of commissioning, optimizing and running this unique machine over the 6 years of its existence.

Slides TUOBA01 [2.503 MB]

TUPPR086

Transport from the Recycler Ring to the Antiproton Source Beamlines

proton, kicker, booster, extraction

2026

M. Xiao
Fermilab, Batavia, USA

In the post-Nova era, the protons are directly transported from the Booster ring to the Recycler ring rather than the Main Injector. For Mu2e and g-2 project, the Debuncher ring will be modified into a Delivery ring to deliver the protons to both Mu2e and g-2 experiemnts. Therefore, It requires the transport of protons from the Recycler Ring to the Delivery ring. A new transfer line from the Recycler ring to the P1 beamline will be constructed to transport proton beam from the Recycler Ring to existing Antiproton Source beamlines. This new beamline provides a way to deliver 8 GeV kinetic energy protons from the Booster to the Delivery ring, via the Recycler, using existing beam transport lines, and without the need for new civil construction. This paper presents the Conceptual Design of this new beamline.

WEOBA02

Tevatron End-of-Run Beam Physics Experiments

proton, emittance, dipole, luminosity

2128

A. Valishev
Fermilab, Batavia, USA
X. Gu, R. Miyamoto, S.M. White
BNL, Upton, Long Island, New York, USA
J. Qiang
LBNL, Berkeley, California, USA
F. Schmidt
CERN, Geneva, Switzerland

Funding: Fermi Research Alliance, LLC operates Fermilab under Contract DE-AC02-07CH11359 with the US Department of Energy. This work was partially supported by the US LHC Accelerator Research Program (LARP).
Before the Tevatron collider Run II ended in September of 2011, a two-week period was devoted to the experiments on various aspects of beam-beam interactions. The studied topics included offset collisions, coherent beam stability, effect of the bunch-length-to-beta-function ratio, and operation of AC dipole with colliding beams. In this report we summarize the results of beam experiments and supporting simulations.

Slides WEOBA02 [1.382 MB]

WEPPD030

Concept for the Antiproton Production Target at FAIR

target, proton, synchrotron, radiation

2570

K. Knie, B. Franzke, V. Gostishchev, M. Steck
GSI, Darmstadt, Germany
P. Sievers
CERN, Geneva, Switzerland

We will report on the status of the antiproton production target for the FAIR facility. A Ni target will be bombarded by a pulsed beam of 29 GeV protons with an intensity of 2.5·10¹³ ppp and a repetition rate of 0.2 Hz. Directly after the target the antiprotons will be focussed by a magnetic horn. In the proceeding magnetic separator antiprotons with an energy of 3 GeV (± 3%) will be selected and transported to the antiproton collector ring. The planned setup of the target area, including radiation protection issues, will be presented,

WEPPD072

Frequency Fine-tuning of a Spin-flip Cavity for Antihydrogen Atoms

cavity, resonance, coupling, vacuum

2690

S. Federmann, F. Caspers, E. Mahner
CERN, Geneva, Switzerland
B. Juhasz, E. Widmann
SMI, Vienna, Austria

As part of the ASACUSA collaboration physics program a spin-flip cavity for measurements of the ground-state hyperfine transition frequency of anti-hydrogen atoms is needed. The purpose of the cavity is to excite anti-hydrogen atoms depending on their polarisation by a microwave field operating at 1.42 GHz. The delicacy of designing such a cavity lies in achieving and maintaining the required properties of this field over a large aperture of 10cm and for a long period of time (required amplitude stability is 1% within 12h). The present paper presents the frequency fine tuning techniques to obtain the desired centre frequency of 1.42 GHz with a Q value below 500 as well as the tuning circuit used for the frequency sweep over the desired bandwidth of 6 MHz.

THPPP002

Operation of the HESR Storage Ring of the FAIR Project with Ions and Rare Isotopes

ion, target, electron, storage-ring

3722

M. Steck, C. Dimopoulou, A. Dolinskii, T. Katayama, Yu.A. Litvinov, T. Stöhlker
GSI, Darmstadt, Germany
R. Maier, D. Prasuhn, H. Stockhorst
FZJ, Jülich, Germany

The HESR storage ring of the FAIR project is designed for experiments with cooled antiprotons. The HESR receives pre-cooled antiprotons from the Collector Ring CR which is also designed for cooling of rare isotope beams. The magnetic rigidity of 13 Tm is the same for the pre-cooling of antiprotons and rare isotopes in the CR. Therefore the transfer of ions or rare isotopes from the CR to the HESR can be performed under similar condition, except the different polarity of the magnetic components. This is an option for the first stage of the FAIR project when no other storage ring is available for experiments with stored ions. In the HESR the ions can be decelerated or accelerated, like the antiprotons, to energies corresponding to the magnetic rigidity range from 5 to 50 Tm. The planned beam cooling systems of the HESR, stochastic and electron cooling, can be applied to improve the quality of the ion beams in the HESR and support experiments using an internal target or the accumulation of rare isotope beams in the HESR. Scenarios for operating the HESR with ions and rare isotopes as well as achievable performance, beam intensity and quality for internal experiments will be discussed.

THPPP008

The ELENA Project: Progress in the Design

extraction, electron, vacuum, emittance

3740

T. Eriksson, W. Bartmann, P. Belochitskii, H. Breuker, F. Butin, C. Carli, R. Kersevan, M. Martini, S. Maury, S. Pasinelli, G. Tranquille
CERN, Geneva, Switzerland
W. Oelert
Forschungszentrum Jülich GmbH, Institut fur Nuklearchemie (INC), Jülich, Germany

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 be equipped with an electron cooler to avoid beam losses during deceleration and to reduce beam phase space at extraction. Design work is progressing with emphasis on machine parameters and design as well as infrastructure, ring, transfer lines and vital subsystem design.

THPPP017

ELENA: From the First Ideas to the Project

electron, extraction, rfq, vacuum

3764

G. Tranquille, P. Belochitskii, T. Eriksson, S. Maury
CERN, Geneva, Switzerland
W. Oelert
Forschungszentrum Jülich GmbH, Institut fur Nuklearchemie (INC), Jülich, Germany

Successful commissioning of the CERN Antiproton Decelerator (AD) in 2000 was followed by significant progress in the creation of antihydrogen atoms. The extraction energy of the decelerated antiprotons is nevertheless very high compared to that required by experiments and results in a trapping efficiency of only 0.1% to 3%. To improve this value by an order of magnitude the study of an Extra Low ENergy Antiproton ring (ELENA) started in 2003 and was approved as a CERN construction project in 2011. During these years the choice of the main machine parameters such as the beam extraction energy, emittance and bunch length were defined, taking into account requests from the physics community. The main challenges were also identified, such as dealing with the large space charge tune, the ultra high vacuum required and the tight requirements for the electron cooler. Housing the ELENA ring within the AD hall significantly reduced the project cost as well as simplifying the beam transfer from AD to ELENA and from ELENA to the existing experimental areas. This contribution will follow ELENA from its beginnings to the final, approved project proposal.

FRXCB01

Review of Microwave Schottky Beam Diagnostics

pick-up, proton, diagnostics, ion

4175

R.J. Pasquinelli
Fermilab, Batavia, USA

Non-intercepting beam diagnostics for detection of the incoherent motion of the finite number of beam particles, i.e. Schottky beam monitors, have been proven as extremely useful to characterize tune, chromaticity, and momentum spread in circular accelerators and colliders. This beam instrument, based on advanced microwave techniques, operates successfully in Recycler and Tevatron, and was recently implemented in the Large Hadron Collider. This presentation should review the technology of Schottky beam diagnostics systems with an emphasis on initial deployment at the Tevatron, concluding with the latest measurement results from the LHC and an outlook of possible improvements and extensions of the diagnostics.

Slides FRXCB01 [22.518 MB]