HB2014 - Classification: Heavy Ion and Rare Isotope Machines

Paper

Title

Page

Beam Dynamics Influence from Quadrupole Components in FRIB Quarter Wave Resonators

108

Z.Q. He, Z. Liu, J. Wei, Y. Zhang, Z. Zheng
FRIB, East Lansing, Michigan, USA

Funding: The work is supported by the U.S. National Science Foundation under Grant No. PHY-11-02511, and the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661.
Non-axisymmetric RF cavities, such as quarter-wave resonators (QWRs), can produce axially asymmetric multipole field components that can influence beam dynamics. For example, dipole components can cause beam steering, an effect that has been well known to the community since 2001. However, higher order multipole field components, such as quadrupole components, which have potential influence on beam dynamics, have never received enough attention yet. In this paper, we choose FRIB QWRs as an example and quadrupole components are extracted by multipole expansion. Then, influence of quadrupole components on a single cavity is studied using thin lens model. After that, the influence of quadrupole components on a whole FRIB linac segment one is studied, and effects such as transverse profile ovalization and blow up of beam size are witnessed. Lastly, a possible way of quadrupole components compensation for FRIB driving linac is discussed.

TUO3AB02

Improved Beam Characteristics from the ATLAS Upgrade

C. Dickerson, B. Mustapha, P.N. Ostroumov, R.C. Pardo, G.P. Zinkann
ANL, Argonne, Illinois, USA

Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357.
The Argonne Tandem Linear Accelerator System (ATLAS) recently completed a significant upgrade and reconfiguration. Along with the major additions of a new CW room temperature RFQ and a new cryostat of quarter wave resonators optimized for = 0.077, the transverse and longitudinal optics were reconfigured to optimize the performance of these new components. Beam commissioning investigations showed an improvement of 15% – 20% in transmission efficiencies and an increase of up to 50% in maximum beam intensities. The details of the upgraded facility and the commissioning results will be presented.

Slides TUO3AB02 [2.661 MB]

TUO3AB03

Initial Commissioning of Ion Beams at SPIRAL2

211

P. Bertrand
GANIL, Caen, France

The official reception of the SPIRAL2 accelerator building occurred in October 2014. In parallel, the installation of the accelerator components has started in June 2013. The first part of the beam commissioning, including the ECR sources, the LEBTs and the 88 MHz RFQ should start in December, with an injection in the Linac by mid-2015. This paper describes the status of the accelerator components and installation, and the philosophy retained to commission the light and heavy ion beams at various required final energies.

Slides TUO3AB03 [9.473 MB]

TUO4AB01

SPES Beam Dynamics

220

A. Pisent, L. Bellan, M. Comunian
INFN/LNL, Legnaro (PD), Italy
L. Calabretta, A.D. Russo
INFN/LNS, Catania, Italy
B.B. Chalykh
ITEP, Moscow, Russia

At LNL INFN is under construction a Rare Isotope Facility (SPES), based on a 35-70 MeV proton cyclotron, able to deliver two beams with a total current up to 0.5 mA, an ISOL fission target station and the existing ALPI superconducting accelerator as post accelerator (up to 10 MeV/u for A/q=7). In this talk the elements between the production target and the experiments will be described: in particular the selection system, the ECR charge breeder, the second separation system and the new CW RFQ (80 MHz, 727 keV/u, internal bunching). The problems that have been solved during the design phase are partly common to all RIB facilities, like the necessity to have high selectivity and high transmission for a beam of very low intensity, plus the specific challenges related to the use of ALPI (with a reduced longitudinal acceptance) and related to the specific lay out. At present the design phase is concluded, and the procurement procedure for the charge breeder, the transfer lines and the RFQ are advanced or will be launched in the next months. The main beam dynamics aspects of the transfer lines (including magnetic selections) and RFQ will be discussed in detail.

Slides TUO4AB01 [7.036 MB]

TUO4AB02

Beam Physics Challenges in RAON

226

D. Jeon, H. Jang, J.-H. Jang, H.J. Kim, I. Shin
IBS, Daejeon, Republic of Korea
J.G. Hwang, E.-S. Kim
KNU, Deagu, Republic of Korea

Construction of the RAON heavy ion accelerator facility is under way in Korea. As high intensity 400 kW superconducting linac (SCL) is employed as a driver, beam physics aspects are carefully studied. The SCL is based on lattice consisting of cryomodules and quadrupole doublets. Beam dynamics studies for the RAON has progressed to cover start-to-end simulations and machine imperfection studies confirming beam loss less than 1 W/m. At present, prototyping of major components are proceeding including 28 GHz ECR ion source, RFQ, superconducting cavities, magnets and cryomodules. First article of prototype superconducting cavities have been delivered that were fabricated through domestic vendors. Prototype HTS quadrupole is under development. Progress report of the RAON accelerator systems is presented.

Slides TUO4AB02 [3.751 MB]

TUO4AB03

Beam Dynamics Studies for the Facility for Rare Isotope Beams Driver Linac

231

M. Ikegami, Z.Q. He, S.M. Lidia, Z. Liu, S.M. Lund, F. Marti, G. Pozdeyev, J. Wei, Y. Yamazaki, Y. Zhang, Q. Zhao
FRIB, East Lansing, Michigan, USA

Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 and the National Science Foundation under Grant No. PHY-1102511.
Facility for Rare Isotope Beams (FRIB) is a high-power heavy ion accelerator facility presently under construction at Michigan State University located in Michigan. FRIB consists of a CW driver linac, experimental facility, the linac accelerates ions up to uranium with the energy of 200 MeV/u and with the beam power of 400 kW. As the assumed beam power is more than two order of magnitude higher than the existing heavy ion linac facilities, various beam dynamics challenges are assumed for the driver linac. In this paper, beam dynamic challenges for FRIB driver linac and undergoing studies to address them are reviewed, which would include those related to machine protection and collimation of halos after a stripper.

WEO1AB01

Upgrade of the UNILAC for FAIR

245

L. Groening, A. Adonin, X. Du, R. Hollinger, S. Mickat, A. Orzhekhovskaya, B. Schlitt, G. Schreiber, H. Vormann, C. Xiao
GSI, Darmstadt, Germany
H. Hähnel, U. Ratzinger, R. Tiede
IAP, Frankfurt am Main, Germany

The UNIversal Linear Accelerator (UNILAC) at GSI has served as injector for all ion species from protons for uranium for the past four decades. Especially its 10⁸ MHz Alvarez type DTL providing acceleration from 1.4 MeV/u to 11.4 MeV/u has suffered from material fatigue. The DTL will be replaced by a completely new section with almost the same design parameters, i.e. pulsed current of up to 15 mA of 238U²⁸⁺ at 11.4 MeV/u. However, operation will be restricted to low beam duty cycles as 200 μs at 10 Hz. Since preservation of beam quality is mandatory, a regular focusing lattice, as along an Alvarez section for instance, is aimed for. A new source terminal & LEBT dedicated to operation with 238U⁴⁺ is under design. The uranium sources need to be upgraded in order to provide increased beam brilliances and for operation at 3 Hz. Revision of the subsequent 36 MHz RFQ electrode design has started as well as the layout activities of the section providing transition from the 36 MHz section to the 108 MHz DTL.

Slides WEO1AB01 [1.325 MB]

WEO1AB02

The Beam Commissioning of BRIF and Future Cyclotron Development at CIAE

T.J. Zhang
CIAE, Beijing, People's Republic of China

As an upgrade project of the existing HI-13 tandem accelerator facility, the Beijing Radioactive Ion-beam Facility (BRIF) is being constructed in China Institute of Atomic Energy (CIAE). This project consists of a 100MeV proton compact cyclotron, a two-stages ISOL system, a superconducting linac booster and various experimental terminals. In this talk, the construction progress of BRIF will be presented in detail. The beam commissioning of the cyclotron is in progress and we got the first 100 MeV beam on July 4, 2014. The beam current was stably maintained at above 25 uA for about 9 hours on July 25, 2014, which is ready for providing CW beam on target for RIB production. The installation of ISOL system is finished and the stable ion beam test shows it can reach a mass resolution better than 10000. It is expected to generate dozens of RIB by 100 MeV proton beam. In additions, this talk also introduce the recent progress of the pre-study of a 800 MeV, 3-4 MW separate-sector proton cyclotron, which is proposed to provide high power proton beam for various applications, such as neutron and neutrino physics, proton radiography and nuclear data measurement and ADS study as well.

Slides WEO1AB02 [6.556 MB]

WEO1AB03

Beam Dynamics in the Front End of the FRIB Heavy Ion Driver

G. Pozdeyev
FRIB, East Lansing, Michigan, USA

Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 and the National Science Foundation under Grant No. PHY-1102511.”
FRIB will deliver heavy ion beams at a power level of 400 kW on the production target. The high beam power requires understanding of processes involved in the production of ion beams by ECR ion sources and defining the beam quality. Also, careful control of the beam phase space is required during transport and acceleration of the beam from ion sources to the SRF linac. In this paper, we describe features of the FRIB front end related to the beam production and control of the beam phase space. Where possible we discuss parallels with other facilities.

THO1AB01

Simultaneous Acceleration of Radioactive and Stable Beams in the ATLAS Linac

334

B. Mustapha, P.N. Ostroumov
ANL, Argonne, USA
M.A. Fraser
CERN, Geneva, Switzerland
A. Perry
Illinois Institute of Technology, Chicago, Illlinois, USA

Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357.
ATLAS is now the only US DOE National User Facility for low-energy heavy-ion stable beams. With the recent commissioning of the Californium Rare Isotope Breeder Upgrade (CARIBU), ATLAS is now also used to accelerate radioactive beams. The demand for both stable and radioactive beam time is already exceeding two to three times the 5500 hours delivered by ATLAS every year. The time structure of the EBIS charge breeder to be installed next year for CARIBU beams is such that only 3% of the ATLAS duty cycle will be used for radioactive beams. Being a CW machine, 97% of the ATLAS cycle will be available for the injection and acceleration of stable beams without retuning. This simultaneous acceleration is possible for stable and radioactive beams with charge-to-mass ratios within 3%. We have developed a strategic plan to upgrade ATLAS for this purpose over the next few years, where two to three beams could be delivered simultaneously to different experimental areas. The upgrade concept will be presented and discussed along with the recent studies and developments done in this direction.

Slides THO1AB01 [1.829 MB]

THO1AB02

Experience with Stripping Heavy Ion Beams

340

H. Okuno
RIKEN Nishina Center, Wako, Japan

Charge strippers play a critical role in many high intensity heavy ion accelerators. The recent progress on accelerator technology makes its role so critical that traditional carbon foils easily reach the limit of application due to their short lifetime. In fact the major heavy ion accelerator facilities such as GSI, MSU/ANL and RIKEN have made elaborating efforts to develop the alternatives to the carbon foils, in order to realize acceleration of very heavy ions such as uranium with high intensity. For example liquid lithium stripper has been developed at MSU/ANL and helium gas stripper and rotating Be disk stripper have been developed at RIKEN RIBF. The two strippers for RIBF greatly contributed to increase of the uranium beam intensity. However we are sure that Be disk stripper used for the second stripper will reach the limit in near future due to its large deformation, which require further developments for our intensity upgrade program.

Slides THO1AB02 [11.042 MB]

THO1AB03

BNL Electron Beam Ion Sources: Status and Challenges

A.I. Pikin, J.G. Alessi, E.N. Beebe
BNL, Upton, Long Island, New York, USA
R. Scrivens, A. Shornikov, F.J.C. Wenander
CERN, Geneva, Switzerland

Funding: US Department of Energy and the National Aeronautic and Space Administration
The Electron Beam Ion Source (EBIS) at the Brookhaven National Laboratory (BNL) is a main source of highly charged ions for both Relativistic Heavy Ion Collider (RHIC) and NASA Space Radiation Laboratory (NSRL). It has delivered a wide variety of ions since 2010 with good stability and reliability. The ongoing development of the electron gun with electrostatic compression has a goal to significantly increase the current density of the electron beam. Such electron beam would allow boosting the charge state of ions, which RHIC EBIS injects into RFQ and therefore to increase their final energy at Booster for NSRL applications. This development can also benefit ISOLDE experiment at CERN, where high charge state of the extracted ions is as important as a large acceptance of EBIS and high repetition rate. The current status of RHIC EBIS and the results of the new gun development are presented.

Slides THO1AB03 [3.358 MB]

THO1AB04

Preserving Beam Quality in Long RFQs on the RF Side: Voltage Stabilization and Tuning

345

A. Palmieri
INFN/LNL, Legnaro (PD), Italy

RFQ’s are the injectors customarily used in modern linacs and the achievement of a high beam transmission for a RFQs is of paramount importance in case of both high intensity linacs and RIBs facilities. This calls for an accurate control of the longitudinal inter vane voltage along the four quadrants of the structure (field stabilization), in order to keep its deviation from nominal value as low as possible (a few %, typically). In particular, for long RFQ (in which the structure length can be significantly higher than the RF wavelength), this aspects is made more challenging, since the effect of a perturbations (e.g. due to mechanical errors and/or misalignments on the nominal RFQ geometry has a major impact on these voltage perturbations. In this presentation, an analysis of these aspects, as well as the methods used to tackle this problem will be described.

Slides THO1AB04 [3.244 MB]

THO2AB01

ECRIS Developments Towards Intense High Brightness Highly-charged Ion Beams

363

L.T. Sun, X. Fang, Y.C. Feng, J.W. Guo, W. Lu, C. Qian, Y. Yang, W.H. Zhang, X.Z. Zhang, H.W. Zhao
IMP, Lanzhou, People's Republic of China

To meet the increasing needs of modern heavy ion accelerators, a ECR ion source must be developed to deliver high intensity high brightness high charge state ion beams, in terms of accelerator output power and beam transmission efficiency. With the success in several laboratories on fully superconducting ECR ion source development, the performance of highly charged heavy ion beams have been greatly enhanced. For instance, U³³⁺ intensity had been doubled in 2011 by VENUS source at LBNL. This paper will present the development work at IMP towards a high performance ECR ion source. Recent high intensity bismuth results will be given, such as 710 eμA Bi³⁰⁺ with SECRAL source. The first room temperature ECR ion source using evaporative cooling technique will also be reviewed. And the discussion of ECRIS extraction and transmission beam line on ion beam quality will also be presented in this paper.

Slides THO2AB01 [4.401 MB]

Paper	Title	Page
MOPAB35	Beam Dynamics Influence from Quadrupole Components in FRIB Quarter Wave Resonators	108
	Z.Q. He, Z. Liu, J. Wei, Y. Zhang, Z. Zheng FRIB, East Lansing, Michigan, USA
	Funding: The work is supported by the U.S. National Science Foundation under Grant No. PHY-11-02511, and the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661. Non-axisymmetric RF cavities, such as quarter-wave resonators (QWRs), can produce axially asymmetric multipole field components that can influence beam dynamics. For example, dipole components can cause beam steering, an effect that has been well known to the community since 2001. However, higher order multipole field components, such as quadrupole components, which have potential influence on beam dynamics, have never received enough attention yet. In this paper, we choose FRIB QWRs as an example and quadrupole components are extracted by multipole expansion. Then, influence of quadrupole components on a single cavity is studied using thin lens model. After that, the influence of quadrupole components on a whole FRIB linac segment one is studied, and effects such as transverse profile ovalization and blow up of beam size are witnessed. Lastly, a possible way of quadrupole components compensation for FRIB driving linac is discussed.

TUO3AB02	Improved Beam Characteristics from the ATLAS Upgrade
	C. Dickerson, B. Mustapha, P.N. Ostroumov, R.C. Pardo, G.P. Zinkann ANL, Argonne, Illinois, USA
	Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357. The Argonne Tandem Linear Accelerator System (ATLAS) recently completed a significant upgrade and reconfiguration. Along with the major additions of a new CW room temperature RFQ and a new cryostat of quarter wave resonators optimized for = 0.077, the transverse and longitudinal optics were reconfigured to optimize the performance of these new components. Beam commissioning investigations showed an improvement of 15% – 20% in transmission efficiencies and an increase of up to 50% in maximum beam intensities. The details of the upgraded facility and the commissioning results will be presented.
	Slides TUO3AB02 [2.661 MB]

TUO3AB03	Initial Commissioning of Ion Beams at SPIRAL2	211
	P. Bertrand GANIL, Caen, France
	The official reception of the SPIRAL2 accelerator building occurred in October 2014. In parallel, the installation of the accelerator components has started in June 2013. The first part of the beam commissioning, including the ECR sources, the LEBTs and the 88 MHz RFQ should start in December, with an injection in the Linac by mid-2015. This paper describes the status of the accelerator components and installation, and the philosophy retained to commission the light and heavy ion beams at various required final energies.
	Slides TUO3AB03 [9.473 MB]

TUO4AB01	SPES Beam Dynamics	220
	A. Pisent, L. Bellan, M. Comunian INFN/LNL, Legnaro (PD), Italy L. Calabretta, A.D. Russo INFN/LNS, Catania, Italy B.B. Chalykh ITEP, Moscow, Russia
	At LNL INFN is under construction a Rare Isotope Facility (SPES), based on a 35-70 MeV proton cyclotron, able to deliver two beams with a total current up to 0.5 mA, an ISOL fission target station and the existing ALPI superconducting accelerator as post accelerator (up to 10 MeV/u for A/q=7). In this talk the elements between the production target and the experiments will be described: in particular the selection system, the ECR charge breeder, the second separation system and the new CW RFQ (80 MHz, 727 keV/u, internal bunching). The problems that have been solved during the design phase are partly common to all RIB facilities, like the necessity to have high selectivity and high transmission for a beam of very low intensity, plus the specific challenges related to the use of ALPI (with a reduced longitudinal acceptance) and related to the specific lay out. At present the design phase is concluded, and the procurement procedure for the charge breeder, the transfer lines and the RFQ are advanced or will be launched in the next months. The main beam dynamics aspects of the transfer lines (including magnetic selections) and RFQ will be discussed in detail.
	Slides TUO4AB01 [7.036 MB]

TUO4AB02	Beam Physics Challenges in RAON	226
	D. Jeon, H. Jang, J.-H. Jang, H.J. Kim, I. Shin IBS, Daejeon, Republic of Korea J.G. Hwang, E.-S. Kim KNU, Deagu, Republic of Korea
	Construction of the RAON heavy ion accelerator facility is under way in Korea. As high intensity 400 kW superconducting linac (SCL) is employed as a driver, beam physics aspects are carefully studied. The SCL is based on lattice consisting of cryomodules and quadrupole doublets. Beam dynamics studies for the RAON has progressed to cover start-to-end simulations and machine imperfection studies confirming beam loss less than 1 W/m. At present, prototyping of major components are proceeding including 28 GHz ECR ion source, RFQ, superconducting cavities, magnets and cryomodules. First article of prototype superconducting cavities have been delivered that were fabricated through domestic vendors. Prototype HTS quadrupole is under development. Progress report of the RAON accelerator systems is presented.
	Slides TUO4AB02 [3.751 MB]

TUO4AB03	Beam Dynamics Studies for the Facility for Rare Isotope Beams Driver Linac	231
	M. Ikegami, Z.Q. He, S.M. Lidia, Z. Liu, S.M. Lund, F. Marti, G. Pozdeyev, J. Wei, Y. Yamazaki, Y. Zhang, Q. Zhao FRIB, East Lansing, Michigan, USA
	Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 and the National Science Foundation under Grant No. PHY-1102511. Facility for Rare Isotope Beams (FRIB) is a high-power heavy ion accelerator facility presently under construction at Michigan State University located in Michigan. FRIB consists of a CW driver linac, experimental facility, the linac accelerates ions up to uranium with the energy of 200 MeV/u and with the beam power of 400 kW. As the assumed beam power is more than two order of magnitude higher than the existing heavy ion linac facilities, various beam dynamics challenges are assumed for the driver linac. In this paper, beam dynamic challenges for FRIB driver linac and undergoing studies to address them are reviewed, which would include those related to machine protection and collimation of halos after a stripper.

WEO1AB01	Upgrade of the UNILAC for FAIR	245
	L. Groening, A. Adonin, X. Du, R. Hollinger, S. Mickat, A. Orzhekhovskaya, B. Schlitt, G. Schreiber, H. Vormann, C. Xiao GSI, Darmstadt, Germany H. Hähnel, U. Ratzinger, R. Tiede IAP, Frankfurt am Main, Germany
	The UNIversal Linear Accelerator (UNILAC) at GSI has served as injector for all ion species from protons for uranium for the past four decades. Especially its 10⁸ MHz Alvarez type DTL providing acceleration from 1.4 MeV/u to 11.4 MeV/u has suffered from material fatigue. The DTL will be replaced by a completely new section with almost the same design parameters, i.e. pulsed current of up to 15 mA of 238U²⁸⁺ at 11.4 MeV/u. However, operation will be restricted to low beam duty cycles as 200 μs at 10 Hz. Since preservation of beam quality is mandatory, a regular focusing lattice, as along an Alvarez section for instance, is aimed for. A new source terminal & LEBT dedicated to operation with 238U⁴⁺ is under design. The uranium sources need to be upgraded in order to provide increased beam brilliances and for operation at 3 Hz. Revision of the subsequent 36 MHz RFQ electrode design has started as well as the layout activities of the section providing transition from the 36 MHz section to the 108 MHz DTL.
	Slides WEO1AB01 [1.325 MB]

WEO1AB02	The Beam Commissioning of BRIF and Future Cyclotron Development at CIAE
	T.J. Zhang CIAE, Beijing, People's Republic of China
	As an upgrade project of the existing HI-13 tandem accelerator facility, the Beijing Radioactive Ion-beam Facility (BRIF) is being constructed in China Institute of Atomic Energy (CIAE). This project consists of a 100MeV proton compact cyclotron, a two-stages ISOL system, a superconducting linac booster and various experimental terminals. In this talk, the construction progress of BRIF will be presented in detail. The beam commissioning of the cyclotron is in progress and we got the first 100 MeV beam on July 4, 2014. The beam current was stably maintained at above 25 uA for about 9 hours on July 25, 2014, which is ready for providing CW beam on target for RIB production. The installation of ISOL system is finished and the stable ion beam test shows it can reach a mass resolution better than 10000. It is expected to generate dozens of RIB by 100 MeV proton beam. In additions, this talk also introduce the recent progress of the pre-study of a 800 MeV, 3-4 MW separate-sector proton cyclotron, which is proposed to provide high power proton beam for various applications, such as neutron and neutrino physics, proton radiography and nuclear data measurement and ADS study as well.
	Slides WEO1AB02 [6.556 MB]

WEO1AB03	Beam Dynamics in the Front End of the FRIB Heavy Ion Driver
	G. Pozdeyev FRIB, East Lansing, Michigan, USA
	Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 and the National Science Foundation under Grant No. PHY-1102511.” FRIB will deliver heavy ion beams at a power level of 400 kW on the production target. The high beam power requires understanding of processes involved in the production of ion beams by ECR ion sources and defining the beam quality. Also, careful control of the beam phase space is required during transport and acceleration of the beam from ion sources to the SRF linac. In this paper, we describe features of the FRIB front end related to the beam production and control of the beam phase space. Where possible we discuss parallels with other facilities.

THO1AB01	Simultaneous Acceleration of Radioactive and Stable Beams in the ATLAS Linac	334
	B. Mustapha, P.N. Ostroumov ANL, Argonne, USA M.A. Fraser CERN, Geneva, Switzerland A. Perry Illinois Institute of Technology, Chicago, Illlinois, USA
	Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357. ATLAS is now the only US DOE National User Facility for low-energy heavy-ion stable beams. With the recent commissioning of the Californium Rare Isotope Breeder Upgrade (CARIBU), ATLAS is now also used to accelerate radioactive beams. The demand for both stable and radioactive beam time is already exceeding two to three times the 5500 hours delivered by ATLAS every year. The time structure of the EBIS charge breeder to be installed next year for CARIBU beams is such that only 3% of the ATLAS duty cycle will be used for radioactive beams. Being a CW machine, 97% of the ATLAS cycle will be available for the injection and acceleration of stable beams without retuning. This simultaneous acceleration is possible for stable and radioactive beams with charge-to-mass ratios within 3%. We have developed a strategic plan to upgrade ATLAS for this purpose over the next few years, where two to three beams could be delivered simultaneously to different experimental areas. The upgrade concept will be presented and discussed along with the recent studies and developments done in this direction.
	Slides THO1AB01 [1.829 MB]

THO1AB02	Experience with Stripping Heavy Ion Beams	340
	H. Okuno RIKEN Nishina Center, Wako, Japan
	Charge strippers play a critical role in many high intensity heavy ion accelerators. The recent progress on accelerator technology makes its role so critical that traditional carbon foils easily reach the limit of application due to their short lifetime. In fact the major heavy ion accelerator facilities such as GSI, MSU/ANL and RIKEN have made elaborating efforts to develop the alternatives to the carbon foils, in order to realize acceleration of very heavy ions such as uranium with high intensity. For example liquid lithium stripper has been developed at MSU/ANL and helium gas stripper and rotating Be disk stripper have been developed at RIKEN RIBF. The two strippers for RIBF greatly contributed to increase of the uranium beam intensity. However we are sure that Be disk stripper used for the second stripper will reach the limit in near future due to its large deformation, which require further developments for our intensity upgrade program.
	Slides THO1AB02 [11.042 MB]

THO1AB03	BNL Electron Beam Ion Sources: Status and Challenges
	A.I. Pikin, J.G. Alessi, E.N. Beebe BNL, Upton, Long Island, New York, USA R. Scrivens, A. Shornikov, F.J.C. Wenander CERN, Geneva, Switzerland
	Funding: US Department of Energy and the National Aeronautic and Space Administration The Electron Beam Ion Source (EBIS) at the Brookhaven National Laboratory (BNL) is a main source of highly charged ions for both Relativistic Heavy Ion Collider (RHIC) and NASA Space Radiation Laboratory (NSRL). It has delivered a wide variety of ions since 2010 with good stability and reliability. The ongoing development of the electron gun with electrostatic compression has a goal to significantly increase the current density of the electron beam. Such electron beam would allow boosting the charge state of ions, which RHIC EBIS injects into RFQ and therefore to increase their final energy at Booster for NSRL applications. This development can also benefit ISOLDE experiment at CERN, where high charge state of the extracted ions is as important as a large acceptance of EBIS and high repetition rate. The current status of RHIC EBIS and the results of the new gun development are presented.
	Slides THO1AB03 [3.358 MB]

THO1AB04	Preserving Beam Quality in Long RFQs on the RF Side: Voltage Stabilization and Tuning	345
	A. Palmieri INFN/LNL, Legnaro (PD), Italy
	RFQ’s are the injectors customarily used in modern linacs and the achievement of a high beam transmission for a RFQs is of paramount importance in case of both high intensity linacs and RIBs facilities. This calls for an accurate control of the longitudinal inter vane voltage along the four quadrants of the structure (field stabilization), in order to keep its deviation from nominal value as low as possible (a few %, typically). In particular, for long RFQ (in which the structure length can be significantly higher than the RF wavelength), this aspects is made more challenging, since the effect of a perturbations (e.g. due to mechanical errors and/or misalignments on the nominal RFQ geometry has a major impact on these voltage perturbations. In this presentation, an analysis of these aspects, as well as the methods used to tackle this problem will be described.
	Slides THO1AB04 [3.244 MB]

THO2AB01	ECRIS Developments Towards Intense High Brightness Highly-charged Ion Beams	363
	L.T. Sun, X. Fang, Y.C. Feng, J.W. Guo, W. Lu, C. Qian, Y. Yang, W.H. Zhang, X.Z. Zhang, H.W. Zhao IMP, Lanzhou, People's Republic of China
	To meet the increasing needs of modern heavy ion accelerators, a ECR ion source must be developed to deliver high intensity high brightness high charge state ion beams, in terms of accelerator output power and beam transmission efficiency. With the success in several laboratories on fully superconducting ECR ion source development, the performance of highly charged heavy ion beams have been greatly enhanced. For instance, U³³⁺ intensity had been doubled in 2011 by VENUS source at LBNL. This paper will present the development work at IMP towards a high performance ECR ion source. Recent high intensity bismuth results will be given, such as 710 eμA Bi³⁰⁺ with SECRAL source. The first room temperature ECR ion source using evaporative cooling technique will also be reviewed. And the discussion of ECRIS extraction and transmission beam line on ion beam quality will also be presented in this paper.
	Slides THO2AB01 [4.401 MB]