IPAC2013 - List of Keywords (interaction-region)

Paper	Title	Other Keywords	Page
MOPEA015	A Transverse Electron Target for Heavy Ion Storage Rings	electron, target, ion, storage-ring	97
	S. Geyer, O. Meusel, D. Ries IAP, Frankfurt am Main, Germany O.K. Kester GSI, Darmstadt, Germany
	A transverse electron target is a well suited concept under discussion for storage rings to investigate electron-ion interaction processes relevant for heavy ion accelerators. Using a sheet beam of free electrons in crossed beam geometry promises not only a high energy resolution but also allows access to the interaction region for photon and electron spectroscopy under large solid angles. To realize a compact and multi-purpose applicable design, only electrostatic fields are used for beam focussing. The produced electron beam has a length of 10cm in ion beam direction and a width of around 5mm in the interaction region with densities of ~10⁹electrons/cm³. The target geometry allows the independent adjustment of the electron beam current and energy in the region of several 10eV and a few keV. The setup meets the high requirements for an operation in the UHV environment of a storage ring and is installed applying the so-called animated beam technique. The electron target is dedicated to the FAIR storage rings. First measurements have been performed at a test bench. An overview of the project status will be presented including first results of the characterization measurements.

MOPWO077	Design of the Proposed Low Energy Ion Collider Ring at Jefferson Lab	ion, booster, collider, electron	1058
	E.W. Nissen, F. Lin, V.S. Morozov, Y. Zhang JLAB, Newport News, Virginia, USA
	Funding: Supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC05-06OR23177 and DE-AC02-06CH11357. The polarized Medium energy Electron-Ion Collider (MEIC) envisioned at Jefferson Lab will cover a range of center-of-mass energies up to 65 GeV. The present MEIC design could also allow the accommodation of low energy electron-ion collisions (LEIC) for additional science reach. This paper presents the first design of the low energy ion collider ring which is converted from the large ion booster of MEIC. It can reach up to 25 GeV energy for protons and equivalent ion energies of the same magnetic rigidity. An interaction region and an electron cooler designed for MEIC are integrated into the low energy collider ring, in addition to other required new elements including crab cavities and ion spin rotators, for later reuse in MEIC itself. A pair of vertical chicanes which brings the low energy ion beams to the plane of the electron ring and back to the low energy ion ring are also part of the design.

TUPFI018	A Simplified Magnetic Field Tapering and Target Optimisation for the Neutrino Factory Capture System	target, solenoid, proton, factory	1370
	I. Efthymiopoulos, S.S. Gilardoni, O.M. Hansen, G. Prior CERN, Geneva, Switzerland O.M. Hansen University of Oslo, Oslo, Norway G. Prior University of Canterbury, Christchurch, New Zealand
	In the Neutrino Factory, a 4 MW proton beam with a kinetic energy between 5 and 15 GeV interacts with a liquid mercury jet target in order to produce pions that will decay to muons, which in turn decay to neutrinos. The baseline-capturing layout consists of a series of solenoids producing a tapered magnetic field from 20 T, near the target, down to 1.5 T at the entrance of the drift section where the captured pions decay into muons to produce a useful beam for the machine. In our alternative layout the magnetic field is rapidly squeezed from 20 T to 1.5T using only three solenoids. This layout showed to produce similar performance, having the advantage being simpler and could potentially be made more robust to radiation. Here we report on further optimization studies taking into account the complete path and shape fluctuations of the Hg-jet.

TUPFI079	A Proposed “Delay Line” for Hadron Beams in RHIC	dipole, quadrupole, optics, hadron	1532
	N. Tsoupas, V. Litvinenko, V. Ptitsyn, D. Trbojevic BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. A “delay line” has been proposed to be installed in the Blue ring of the RHIC to accommodate collisions of asymmetric nuclei. The delay line can also be used in the e-RHIC accelerator to accommodate electron hadron collisions at various energies. We will present the layout and the optics of the delay line and we will discuss the energy range that asymmetric collisions can be performed in the RHIC collider.

THPME044	Fabrication and Test of a 1 M Long Single-aperture 11 T Nb3Sn Dipole for LHC Upgrades	dipole, sextupole, luminosity, magnet-design	3609
	A.V. Zlobin, N. Andreev, G. Apollinari, E.Z. Barzi, R. Bossert, G. Chlachidze, J. DiMarco, A. Nobrega, I. Novitski, D. Turrioni, G. Velev Fermilab, Batavia, USA B. Auchmann, M. Karppinen, L. Rossi, D. Smekens CERN, Geneva, Switzerland
	Funding: Work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy and European Commission under FP7 project HiLumi LHC, GA no.284404 The planned upgrade of the LHC collimation system includes two additional collimators to be installed in the dispersion suppressor areas around points 2, 3 and 7, and high luminosity interaction regions in points 1 and 5. The necessary longitudinal space for the collimators could be provided by replacing some 8.33 T NbTi LHC main dipoles with 11 T dipoles based on Nb3Sn superconductor and compatible with the LHC lattice and main systems. To demonstrate this possibility Fermilab and CERN have started in 2011 a joint R&D program with the goal of building by 2015 a 5.5-m long twin-aperture dipole prototype suitable for installation in the LHC. An important part of the program is the development and test a series of short single-aperture demonstration dipoles with the nominal field of 11 T at the LHC nominal current of ~11.85 kA and ~20% margin. This paper describes the design features and test results of a 1-m long single-aperture Nb3Sn demonstrator dipole for the LHC collimation system upgrade.

Paper

Title

Other Keywords

Page

MOPEA015

A Transverse Electron Target for Heavy Ion Storage Rings

electron, target, ion, storage-ring

97

S. Geyer, O. Meusel, D. Ries
IAP, Frankfurt am Main, Germany
O.K. Kester
GSI, Darmstadt, Germany

A transverse electron target is a well suited concept under discussion for storage rings to investigate electron-ion interaction processes relevant for heavy ion accelerators. Using a sheet beam of free electrons in crossed beam geometry promises not only a high energy resolution but also allows access to the interaction region for photon and electron spectroscopy under large solid angles. To realize a compact and multi-purpose applicable design, only electrostatic fields are used for beam focussing. The produced electron beam has a length of 10cm in ion beam direction and a width of around 5mm in the interaction region with densities of ~10⁹electrons/cm³. The target geometry allows the independent adjustment of the electron beam current and energy in the region of several 10eV and a few keV. The setup meets the high requirements for an operation in the UHV environment of a storage ring and is installed applying the so-called animated beam technique. The electron target is dedicated to the FAIR storage rings. First measurements have been performed at a test bench. An overview of the project status will be presented including first results of the characterization measurements.

MOPWO077

Design of the Proposed Low Energy Ion Collider Ring at Jefferson Lab

ion, booster, collider, electron

1058

E.W. Nissen, F. Lin, V.S. Morozov, Y. Zhang
JLAB, Newport News, Virginia, USA

Funding: Supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC05-06OR23177 and DE-AC02-06CH11357.
The polarized Medium energy Electron-Ion Collider (MEIC) envisioned at Jefferson Lab will cover a range of center-of-mass energies up to 65 GeV. The present MEIC design could also allow the accommodation of low energy electron-ion collisions (LEIC) for additional science reach. This paper presents the first design of the low energy ion collider ring which is converted from the large ion booster of MEIC. It can reach up to 25 GeV energy for protons and equivalent ion energies of the same magnetic rigidity. An interaction region and an electron cooler designed for MEIC are integrated into the low energy collider ring, in addition to other required new elements including crab cavities and ion spin rotators, for later reuse in MEIC itself. A pair of vertical chicanes which brings the low energy ion beams to the plane of the electron ring and back to the low energy ion ring are also part of the design.

TUPFI018

A Simplified Magnetic Field Tapering and Target Optimisation for the Neutrino Factory Capture System

target, solenoid, proton, factory

1370

I. Efthymiopoulos, S.S. Gilardoni, O.M. Hansen, G. Prior
CERN, Geneva, Switzerland
O.M. Hansen
University of Oslo, Oslo, Norway
G. Prior
University of Canterbury, Christchurch, New Zealand

In the Neutrino Factory, a 4 MW proton beam with a kinetic energy between 5 and 15 GeV interacts with a liquid mercury jet target in order to produce pions that will decay to muons, which in turn decay to neutrinos. The baseline-capturing layout consists of a series of solenoids producing a tapered magnetic field from 20 T, near the target, down to 1.5 T at the entrance of the drift section where the captured pions decay into muons to produce a useful beam for the machine. In our alternative layout the magnetic field is rapidly squeezed from 20 T to 1.5T using only three solenoids. This layout showed to produce similar performance, having the advantage being simpler and could potentially be made more robust to radiation. Here we report on further optimization studies taking into account the complete path and shape fluctuations of the Hg-jet.

TUPFI079

A Proposed “Delay Line” for Hadron Beams in RHIC

dipole, quadrupole, optics, hadron

1532

N. Tsoupas, V. Litvinenko, V. Ptitsyn, D. Trbojevic
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
A “delay line” has been proposed to be installed in the Blue ring of the RHIC to accommodate collisions of asymmetric nuclei. The delay line can also be used in the e-RHIC accelerator to accommodate electron hadron collisions at various energies. We will present the layout and the optics of the delay line and we will discuss the energy range that asymmetric collisions can be performed in the RHIC collider.

THPME044

Fabrication and Test of a 1 M Long Single-aperture 11 T Nb3Sn Dipole for LHC Upgrades

dipole, sextupole, luminosity, magnet-design

3609

A.V. Zlobin, N. Andreev, G. Apollinari, E.Z. Barzi, R. Bossert, G. Chlachidze, J. DiMarco, A. Nobrega, I. Novitski, D. Turrioni, G. Velev
Fermilab, Batavia, USA
B. Auchmann, M. Karppinen, L. Rossi, D. Smekens
CERN, Geneva, Switzerland

Funding: Work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy and European Commission under FP7 project HiLumi LHC, GA no.284404
The planned upgrade of the LHC collimation system includes two additional collimators to be installed in the dispersion suppressor areas around points 2, 3 and 7, and high luminosity interaction regions in points 1 and 5. The necessary longitudinal space for the collimators could be provided by replacing some 8.33 T NbTi LHC main dipoles with 11 T dipoles based on Nb3Sn superconductor and compatible with the LHC lattice and main systems. To demonstrate this possibility Fermilab and CERN have started in 2011 a joint R&D program with the goal of building by 2015 a 5.5-m long twin-aperture dipole prototype suitable for installation in the LHC. An important part of the program is the development and test a series of short single-aperture demonstration dipoles with the nominal field of 11 T at the LHC nominal current of ~11.85 kA and ~20% margin. This paper describes the design features and test results of a 1-m long single-aperture Nb3Sn demonstrator dipole for the LHC collimation system upgrade.