PAC2013 - List of Authors (Saini, A.)

Paper	Title	Page
MOPMA10	Studies of Fault Scenarios in SC CW Project-X Linac	318
	A. Saini, J.-F. Ostiguy, N. Solyak, V.P. Yakovlev Fermilab, Batavia, USA
	The success of Project-X accelerator facility crucially depends on reliable operation of 1 GeV superconducting (SC) continuous wave (CW) linac at first stage. Operation at high intensity in CW mode puts stringent tolerances on beamline elements. Any fault scenario that affects nominal operation of beamline elements results in beam mismatch with subsequent sections. This in turn leads to emittance growth, and ultimately triggers beam losses. In worst case, it could affect the reliability of the machine and long downtime may be needed to replace the faulty elements. In order to reduce beam interruptions, a robust lattice design is required which can allow local retuning to make the machine operable in such scenarios. This paper presents studies performed to understand the consequences of failure of various beamline elements and discusses outcome of local retuning for different fault scenarios at critical locations in linac.

MOPMA12	Design Issues of High Intensity SC CW Ion Linac for Project-X facility	321
	A. Saini, N. Solyak, V.P. Yakovlev Fermilab, Batavia, USA
	Project-X is a high intensity proton facility which is primarily based on superconducting (SC) continuous wave (CW) linac. One of the most challenging tasks of Project-X facility is to have robust design of SC CW linac which can provide high quality beam to several experiments and subsequent pulsed linac simultaneously. Among the various technical problems associated with the SC CW linac, halo formation, beam mismatch, uncontrolled emittance growth and beam losses are the most crucial as they can limit overall performance and reliability. Scope of this paper is to address these issues for reference design of Project-X SC CW linac.

MOPMA13	Layout of Project-X Facility: A Reference Design	324
	A. Saini, J.-P. Carneiro, D.E. Johnson, J.-F. Ostiguy, N. Solyak, V.P. Yakovlev Fermilab, Batavia, USA
	Project-X is a proposed high intensity proton facility to be built at Fermilab. It will be a multi-user facility which can support several experiments simultaneously. In the current scenario, Project-X facility would be built in three stages. Each stage is associated with compelling scientific programs and in synergy with Fermilab infrastructure. This paper will present reference design of Project-X accelerator facility and discuss main motivations and requirements resulting in this layout and beam optics.

WEPAC32	Wakefield Loss Analysis of the Elliptical 3.9 GHz Third Harmonic Cavity	847
	M.H. Awida, P. Berrutti, T.N. Khabiboulline, A. Saini, V.P. Yakovlev Fermilab, Batavia, USA
	Third harmonic 3.9 GHz elliptical cavities are planned to be used in many particle accelerator projects such as XFEL, NGLS, and ASTA. In this paper, the wakefield losses due to single bunch passage are analysed considering bunches of RMS length 8 mm down to ultra short ones of 10 μm length. Both the loss and kick factors are numerically calculated for bunches of relatively long length (>1 mm) using CST wakefield solver. The data is then used to extrapolate asymptotically the values for ultra-short bunches by finding the wake functions. These calculations are essential to estimate the cryogenic losses in cryomodules and for beam dynamic analysis.

Paper

Title

Page

Studies of Fault Scenarios in SC CW Project-X Linac

318

A. Saini, J.-F. Ostiguy, N. Solyak, V.P. Yakovlev
Fermilab, Batavia, USA

The success of Project-X accelerator facility crucially depends on reliable operation of 1 GeV superconducting (SC) continuous wave (CW) linac at first stage. Operation at high intensity in CW mode puts stringent tolerances on beamline elements. Any fault scenario that affects nominal operation of beamline elements results in beam mismatch with subsequent sections. This in turn leads to emittance growth, and ultimately triggers beam losses. In worst case, it could affect the reliability of the machine and long downtime may be needed to replace the faulty elements. In order to reduce beam interruptions, a robust lattice design is required which can allow local retuning to make the machine operable in such scenarios. This paper presents studies performed to understand the consequences of failure of various beamline elements and discusses outcome of local retuning for different fault scenarios at critical locations in linac.

MOPMA12

Design Issues of High Intensity SC CW Ion Linac for Project-X facility

321

A. Saini, N. Solyak, V.P. Yakovlev
Fermilab, Batavia, USA

Project-X is a high intensity proton facility which is primarily based on superconducting (SC) continuous wave (CW) linac. One of the most challenging tasks of Project-X facility is to have robust design of SC CW linac which can provide high quality beam to several experiments and subsequent pulsed linac simultaneously. Among the various technical problems associated with the SC CW linac, halo formation, beam mismatch, uncontrolled emittance growth and beam losses are the most crucial as they can limit overall performance and reliability. Scope of this paper is to address these issues for reference design of Project-X SC CW linac.

MOPMA13

Layout of Project-X Facility: A Reference Design

324

A. Saini, J.-P. Carneiro, D.E. Johnson, J.-F. Ostiguy, N. Solyak, V.P. Yakovlev
Fermilab, Batavia, USA

Project-X is a proposed high intensity proton facility to be built at Fermilab. It will be a multi-user facility which can support several experiments simultaneously. In the current scenario, Project-X facility would be built in three stages. Each stage is associated with compelling scientific programs and in synergy with Fermilab infrastructure. This paper will present reference design of Project-X accelerator facility and discuss main motivations and requirements resulting in this layout and beam optics.

WEPAC32

Wakefield Loss Analysis of the Elliptical 3.9 GHz Third Harmonic Cavity

847

M.H. Awida, P. Berrutti, T.N. Khabiboulline, A. Saini, V.P. Yakovlev
Fermilab, Batavia, USA

Third harmonic 3.9 GHz elliptical cavities are planned to be used in many particle accelerator projects such as XFEL, NGLS, and ASTA. In this paper, the wakefield losses due to single bunch passage are analysed considering bunches of RMS length 8 mm down to ultra short ones of 10 μm length. Both the loss and kick factors are numerically calculated for bunches of relatively long length (>1 mm) using CST wakefield solver. The data is then used to extrapolate asymptotically the values for ultra-short bunches by finding the wake functions. These calculations are essential to estimate the cryogenic losses in cryomodules and for beam dynamic analysis.