IPAC2015 - List of Authors (Assadi, S.)

Paper	Title	Page
MOPMA047	Nonlinear Beam Dynamics Studies of the Next Generation Strong Focusing Cyclotrons as Compact High Brightness, Low Emittance Drivers	656
	S. Assadi, P.M. McIntyre, A. Sattarov Texas A&M University, College Station, Texas, USA N. Pogue PSI, Villigen, Villigen, Switzerland
	Funding: Work is partially supported by grants from the State of Texas (ASE) & the Michelle foundation. The Strong Focusing Cyclotron development at Texas A&M University has evolved from stacks of cyclotrons to a single layer high brightness, low emittance to produce greater than 10 mA of proton beam to a desired target at 800 MeV. The latest design has a major geometric design optimization of strong focusing quadrupoles and a modified algorithm of high gradient cavities to address the small turn separation, and interaction of radially neighboring bunches and reduced the number of turns necessary to reach the desired final energy under control conditions. In this paper, we present the new design, physics of nonlinear synchrobetratron coupling, mνh+nνv=p causing beam blow-up in other form of cyclotrons and how we have resolved it. The cavity beam loading and space charge effects of multi turns at low energies to reduce losses are discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMA047
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TUPTY078	Fixed-energy Cooling and Stacking for an Electron Ion Collider	2214
	P.M. McIntyre, S. Assadi, J. Gerity, A. Sattarov Texas A&M University, College Station, Texas, USA
	The proposed designs for polarized-beam electron-ion colliders require cooling of the ion beam to achieve and sustain high luminosity. One attractive approach is to make a fixed-energy storage ring in which ions are con-tinuously cooled and stacked during a collider store, then transferred to the collider and accelerated for a new store when the luminosity decreases. An example design is reported for a 6 GeV/u superferric storage ring, and for a d.c. electron cooling system in which electron space charge is fully neutralized so that high-current magnetized e-cooling can be used to best advantage.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPTY078
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WEPTY057	Adaptable Machine Protection Architecture for CW, High Intensity Accelerators	3402
	S. Assadi Texas A&M University, College Station, Texas, USA
	Funding: Work is partially supported by grants from the State of Texas (ASE) & the Michelle foundation An adaptable architecture of a machine protection system (MPS) suitable for continuous wave (cw), high intensity accelerators like those proposed for Accelerator Driven Systems (ADS) for subcritical reactor strategies and heavy ion accelerators for the production of rare isotopes is presented. A system of databases, networks and nodes that can systematically and flexibly be reconfigured to rebalance the required metadata is used. Additional features include reconfigurable machine setup templates that can rigorously be tested with mirror redundant online backups, the utilization of external reconfigurable geometric algorithms for the data channels and the network distribution, and the inclusion of initial system requirements as well as envisioned upgrades.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPTY057
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WEPTY058	Diagnostics for High Power CW Accelerators	3405
	S. Assadi Texas A&M University, College Station, Texas, USA
	Funding: Work is partially supported by grants from the State of Texas (ASE) & the Michelle foundation High power, continuous wave (cw) accelerators are proposed for applications such as Accelerator Driven Systems (ADS) for subcritical reactor strategies and heavy ion accelerators for the production of rare isotopes. Because of the high beam powers and high energy loss with beam interception of material, the beam diagnostic designs are necessarily shifting to non-intercepting, real-time feedback devices that can be fully integrated with the accelerator machine protection system (MPS) and operation control system including online models. Appropriate for these applications, three types of beam diagnostics (lanthanum bromide scintillation coincidence detectors, GaN neutron and gamma detectors, and beam position monitors) are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPTY058
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THPF134	Magnet Design and Synchrotron Damping Considerations for a 100 TeV Hadron Collider	4034
	P.M. McIntyre, S. Assadi, J. Gerity, T.L. Mann, A. Sattarov Texas A&M University, College Station, Texas, USA D. Chavez DCI-UG, León, Mexico N. Pogue PSI, Villigen, Villigen, Switzerland M. Tomsic Hypertech Research, Inc., Columbus, USA
	A conceptual design is presented for a 100 TeV hadron collider based upon a 4.5 T NbTi cable-in-conduit dipole technology. It incorporates a side radiation channel to extract synchrotron radiation from the beam channel so that it does not produce limitations from heating on a beam liner or gas load limits on collider performance. Synchrotron damping can be used to support ‘bottom-up’ stacking to sustain maximum luminosity in the collisions.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF134
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THPF135	Optimization of Orbits, SRF Acceleration, and Focusing Lattice for a Strong-Focusing Cyclotron	4038
	K.E. Melconian, S. Assadi, J. Gerity, J.N. Kellams, P.M. McIntyre, A. Sattarov Texas A&M University, College Station, Texas, USA N. Pogue PSI, Villigen, Villigen, Switzerland
	The strong-focusing cyclotron is a high-current proton/ion accelerator in which superconducting rf cavities are used to provide enough energy gain per turn to fully separate orbits, and arc-shaped beam transport channels are located in the sector dipole aperture to provide strong focusing of all orbits. An optimization method has been devised by which the orbit separations can be adjusted to provide sufficient separation while maintaining isochronicity on all orbits. The transport optics of the FD lattice is also optimized to provide stable transport and to lock the betatron tunes to a favorable value over the full range of acceleration.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF135
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Paper

Title

Page

Nonlinear Beam Dynamics Studies of the Next Generation Strong Focusing Cyclotrons as Compact High Brightness, Low Emittance Drivers

656

S. Assadi, P.M. McIntyre, A. Sattarov
Texas A&M University, College Station, Texas, USA
N. Pogue
PSI, Villigen, Villigen, Switzerland

Funding: Work is partially supported by grants from the State of Texas (ASE) & the Michelle foundation.
The Strong Focusing Cyclotron development at Texas A&M University has evolved from stacks of cyclotrons to a single layer high brightness, low emittance to produce greater than 10 mA of proton beam to a desired target at 800 MeV. The latest design has a major geometric design optimization of strong focusing quadrupoles and a modified algorithm of high gradient cavities to address the small turn separation, and interaction of radially neighboring bunches and reduced the number of turns necessary to reach the desired final energy under control conditions. In this paper, we present the new design, physics of nonlinear synchrobetratron coupling, mνh+nνv=p causing beam blow-up in other form of cyclotrons and how we have resolved it. The cavity beam loading and space charge effects of multi turns at low energies to reduce losses are discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMA047

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPTY078

Fixed-energy Cooling and Stacking for an Electron Ion Collider

2214

P.M. McIntyre, S. Assadi, J. Gerity, A. Sattarov
Texas A&M University, College Station, Texas, USA

The proposed designs for polarized-beam electron-ion colliders require cooling of the ion beam to achieve and sustain high luminosity. One attractive approach is to make a fixed-energy storage ring in which ions are con-tinuously cooled and stacked during a collider store, then transferred to the collider and accelerated for a new store when the luminosity decreases. An example design is reported for a 6 GeV/u superferric storage ring, and for a d.c. electron cooling system in which electron space charge is fully neutralized so that high-current magnetized e-cooling can be used to best advantage.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPTY078

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPTY057

Adaptable Machine Protection Architecture for CW, High Intensity Accelerators

3402

S. Assadi
Texas A&M University, College Station, Texas, USA

Funding: Work is partially supported by grants from the State of Texas (ASE) & the Michelle foundation
An adaptable architecture of a machine protection system (MPS) suitable for continuous wave (cw), high intensity accelerators like those proposed for Accelerator Driven Systems (ADS) for subcritical reactor strategies and heavy ion accelerators for the production of rare isotopes is presented. A system of databases, networks and nodes that can systematically and flexibly be reconfigured to rebalance the required metadata is used. Additional features include reconfigurable machine setup templates that can rigorously be tested with mirror redundant online backups, the utilization of external reconfigurable geometric algorithms for the data channels and the network distribution, and the inclusion of initial system requirements as well as envisioned upgrades.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPTY057

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPTY058

Diagnostics for High Power CW Accelerators

3405

S. Assadi
Texas A&M University, College Station, Texas, USA

Funding: Work is partially supported by grants from the State of Texas (ASE) & the Michelle foundation
High power, continuous wave (cw) accelerators are proposed for applications such as Accelerator Driven Systems (ADS) for subcritical reactor strategies and heavy ion accelerators for the production of rare isotopes. Because of the high beam powers and high energy loss with beam interception of material, the beam diagnostic designs are necessarily shifting to non-intercepting, real-time feedback devices that can be fully integrated with the accelerator machine protection system (MPS) and operation control system including online models. Appropriate for these applications, three types of beam diagnostics (lanthanum bromide scintillation coincidence detectors, GaN neutron and gamma detectors, and beam position monitors) are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPTY058

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPF134

Magnet Design and Synchrotron Damping Considerations for a 100 TeV Hadron Collider

4034

P.M. McIntyre, S. Assadi, J. Gerity, T.L. Mann, A. Sattarov
Texas A&M University, College Station, Texas, USA
D. Chavez
DCI-UG, León, Mexico
N. Pogue
PSI, Villigen, Villigen, Switzerland
M. Tomsic
Hypertech Research, Inc., Columbus, USA

A conceptual design is presented for a 100 TeV hadron collider based upon a 4.5 T NbTi cable-in-conduit dipole technology. It incorporates a side radiation channel to extract synchrotron radiation from the beam channel so that it does not produce limitations from heating on a beam liner or gas load limits on collider performance. Synchrotron damping can be used to support ‘bottom-up’ stacking to sustain maximum luminosity in the collisions.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF134

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPF135

Optimization of Orbits, SRF Acceleration, and Focusing Lattice for a Strong-Focusing Cyclotron

4038

K.E. Melconian, S. Assadi, J. Gerity, J.N. Kellams, P.M. McIntyre, A. Sattarov
Texas A&M University, College Station, Texas, USA
N. Pogue
PSI, Villigen, Villigen, Switzerland

The strong-focusing cyclotron is a high-current proton/ion accelerator in which superconducting rf cavities are used to provide enough energy gain per turn to fully separate orbits, and arc-shaped beam transport channels are located in the sector dipole aperture to provide strong focusing of all orbits. An optimization method has been devised by which the orbit separations can be adjusted to provide sufficient separation while maintaining isochronicity on all orbits. The transport optics of the FD lattice is also optimized to provide stable transport and to lock the betatron tunes to a favorable value over the full range of acceleration.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF135

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)