SRF2011 - List of Authors (Delayen, J.R.)

Paper

Title

Page

Higher Order Mode Properties of Superconducting Two-Spoke Cavities

114

C.S. Hopper
ODU, Norfolk, Virginia, USA
J.R. Delayen
JLAB, Newport News, Virginia, USA
R.G. Olave
Old Dominion University, Norfolk, Virginia, USA

Multi-Spoke cavities lack the cylindrical symmetry that many other cavity types have, which leads to a more complex Higher Order Mode (HOM) spectrum. In addition, spoke cavities offer a large velocity acceptance which means we must perform a detailed analysis of the particle velocity dependence for each mode’s R/Q. We present here a study of the HOM properties of two-spoke cavities designed for high-velocity applications. Frequencies, R/Q and field profiles of HOMs have been calculated and are reported.

MOPO027

Analysis of HOM Properties of Superconducting Parallel-Bar Deflecting/Crabbing Cavities

135

S.U. De Silva
ODU, Norfolk, Virginia, USA
S.U. De Silva, J.R. Delayen
JLAB, Newport News, Virginia, USA

The superconducting parallel-bar cavity is currently being considered for a number of deflecting and crabbing applications due to improved properties and compact design geometries. The 499 MHz deflecting cavity proposed for the Jefferson Lab 12 GeV upgrade and the 400 MHz crab cavity for the proposed LHC luminosity upgrade are two of the major applications. For high current applications the higher order modes must be damped to acceptable levels to eliminate any beam instabilities. The frequencies and R/Q of the HOMs and mode separation are evaluated and compared for different parallel-bar cavity designs.

MOPO033

Design of Superconducting Multi-Spoke Cavities for High-Velocity Applications

154

C.S. Hopper
ODU, Norfolk, Virginia, USA
J.R. Delayen
JLAB, Newport News, Virginia, USA

Superconducting spoke cavities have been designed and tested for particle velocities up to β ~ 0.6 and are currently being designed for velocities up to β = 1. We present the electromagnetic designs for two-spoke cavities operating at 325 MHz for β = 0.82 and β = 1.

MOPO043

Mechanical Study of Superconducting Parallel-Bar Deflecting/Crabbing Cavities

188

H. Park, J.R. Delayen
JLAB, Newport News, Virginia, USA
S.U. De Silva, H. Park
ODU, Norfolk, Virginia, USA

The superconducting parallel-bar deflecting/crabbing cavities have improved properties compared to conventional cavity structures. It is currently being considered for number of applications. The mechanical design analysis is performed on two designs of the 499 MHz parallel-bar deflecting cavity for the Jefferson Lab 12 GeV upgrade. The main purpose of the mechanical study is to examine the structural stability of the cavities under the operating conditions in the accelerators. The study results will suggest the need for additional structural strengthening. Also the study results will help to develop a concept of the tuning method. If the cavity is to be installed in the accelerator it should satisfy a certain design parameters due to the safety requirements (for example, pressure system requirements) which are much severe condition than the actual operating condition.

MOPO053

Designs of Superconducting Parallel-Bar Deflecting Cavities for Deflecting/Crabbing Applications

219

J.R. Delayen, S.U. De Silva
ODU, Norfolk, Virginia, USA
J.R. Delayen
JLAB, Newport News, Virginia, USA

The superconducting parallel-bar cavity is a deflecting/crabbing cavity with attractive properties, compared to other conventional designs, that is currently being considered for a number of applications. The new parallel-bar design with curved loading elements and circular or elliptical outer conductors have improved properties compared to the designs with rectangular outer conductors. We present the designs proposed as deflecting cavities for the Jefferson Lab 12 GeV upgrade and for Project-X and as crabbing cavities for the proposed LHC luminosity upgrade and electron-ion collider at Jefferson Lab.

Poster MOPO053 [0.911 MB]

MOPO053

Designs of Superconducting Parallel-Bar Deflecting Cavities for Deflecting/Crabbing Applications

219

J.R. Delayen, S.U. De Silva
ODU, Norfolk, Virginia, USA
J.R. Delayen
JLAB, Newport News, Virginia, USA

The superconducting parallel-bar cavity is a deflecting/crabbing cavity with attractive properties, compared to other conventional designs, that is currently being considered for a number of applications. The new parallel-bar design with curved loading elements and circular or elliptical outer conductors have improved properties compared to the designs with rectangular outer conductors. We present the designs proposed as deflecting cavities for the Jefferson Lab 12 GeV upgrade and for Project-X and as crabbing cavities for the proposed LHC luminosity upgrade and electron-ion collider at Jefferson Lab.

Poster MOPO053 [0.911 MB]

THIOA03

Compact Superconducting Cavities for Deflecting and Crabbing Applications

631

J.R. Delayen
ODU, Norfolk, Virginia, USA

There is increasing interest in using superconducting cavities as rf separators (e.g. Jefferson Lab 12 GeV upgrade and Fermilab Project X) or as crabbing systems to increase the luminosity in colliders (e.g. LHC upgrade and electron-ion colliders). Several of these applications have severe dimensional constraints that would prevent the use of cavities operating in the TM110 mode. A number of compact designs for deflecting/crabbing cavities have been designed and are under development; their properties are presented.

Slides THIOA03 [5.243 MB]

Paper	Title	Page
MOPO022	Higher Order Mode Properties of Superconducting Two-Spoke Cavities	114
	C.S. Hopper ODU, Norfolk, Virginia, USA J.R. Delayen JLAB, Newport News, Virginia, USA R.G. Olave Old Dominion University, Norfolk, Virginia, USA
	Multi-Spoke cavities lack the cylindrical symmetry that many other cavity types have, which leads to a more complex Higher Order Mode (HOM) spectrum. In addition, spoke cavities offer a large velocity acceptance which means we must perform a detailed analysis of the particle velocity dependence for each mode’s R/Q. We present here a study of the HOM properties of two-spoke cavities designed for high-velocity applications. Frequencies, R/Q and field profiles of HOMs have been calculated and are reported.

MOPO027	Analysis of HOM Properties of Superconducting Parallel-Bar Deflecting/Crabbing Cavities	135
	S.U. De Silva ODU, Norfolk, Virginia, USA S.U. De Silva, J.R. Delayen JLAB, Newport News, Virginia, USA
	The superconducting parallel-bar cavity is currently being considered for a number of deflecting and crabbing applications due to improved properties and compact design geometries. The 499 MHz deflecting cavity proposed for the Jefferson Lab 12 GeV upgrade and the 400 MHz crab cavity for the proposed LHC luminosity upgrade are two of the major applications. For high current applications the higher order modes must be damped to acceptable levels to eliminate any beam instabilities. The frequencies and R/Q of the HOMs and mode separation are evaluated and compared for different parallel-bar cavity designs.

MOPO033	Design of Superconducting Multi-Spoke Cavities for High-Velocity Applications	154
	C.S. Hopper ODU, Norfolk, Virginia, USA J.R. Delayen JLAB, Newport News, Virginia, USA
	Superconducting spoke cavities have been designed and tested for particle velocities up to β ~ 0.6 and are currently being designed for velocities up to β = 1. We present the electromagnetic designs for two-spoke cavities operating at 325 MHz for β = 0.82 and β = 1.

MOPO043	Mechanical Study of Superconducting Parallel-Bar Deflecting/Crabbing Cavities	188
	H. Park, J.R. Delayen JLAB, Newport News, Virginia, USA S.U. De Silva, H. Park ODU, Norfolk, Virginia, USA
	The superconducting parallel-bar deflecting/crabbing cavities have improved properties compared to conventional cavity structures. It is currently being considered for number of applications. The mechanical design analysis is performed on two designs of the 499 MHz parallel-bar deflecting cavity for the Jefferson Lab 12 GeV upgrade. The main purpose of the mechanical study is to examine the structural stability of the cavities under the operating conditions in the accelerators. The study results will suggest the need for additional structural strengthening. Also the study results will help to develop a concept of the tuning method. If the cavity is to be installed in the accelerator it should satisfy a certain design parameters due to the safety requirements (for example, pressure system requirements) which are much severe condition than the actual operating condition.

MOPO053	Designs of Superconducting Parallel-Bar Deflecting Cavities for Deflecting/Crabbing Applications	219
	J.R. Delayen, S.U. De Silva ODU, Norfolk, Virginia, USA J.R. Delayen JLAB, Newport News, Virginia, USA
	The superconducting parallel-bar cavity is a deflecting/crabbing cavity with attractive properties, compared to other conventional designs, that is currently being considered for a number of applications. The new parallel-bar design with curved loading elements and circular or elliptical outer conductors have improved properties compared to the designs with rectangular outer conductors. We present the designs proposed as deflecting cavities for the Jefferson Lab 12 GeV upgrade and for Project-X and as crabbing cavities for the proposed LHC luminosity upgrade and electron-ion collider at Jefferson Lab.
	Poster MOPO053 [0.911 MB]

MOPO053	Designs of Superconducting Parallel-Bar Deflecting Cavities for Deflecting/Crabbing Applications	219
	J.R. Delayen, S.U. De Silva ODU, Norfolk, Virginia, USA J.R. Delayen JLAB, Newport News, Virginia, USA
	The superconducting parallel-bar cavity is a deflecting/crabbing cavity with attractive properties, compared to other conventional designs, that is currently being considered for a number of applications. The new parallel-bar design with curved loading elements and circular or elliptical outer conductors have improved properties compared to the designs with rectangular outer conductors. We present the designs proposed as deflecting cavities for the Jefferson Lab 12 GeV upgrade and for Project-X and as crabbing cavities for the proposed LHC luminosity upgrade and electron-ion collider at Jefferson Lab.
	Poster MOPO053 [0.911 MB]

THIOA03	Compact Superconducting Cavities for Deflecting and Crabbing Applications	631
	J.R. Delayen ODU, Norfolk, Virginia, USA
	There is increasing interest in using superconducting cavities as rf separators (e.g. Jefferson Lab 12 GeV upgrade and Fermilab Project X) or as crabbing systems to increase the luminosity in colliders (e.g. LHC upgrade and electron-ion colliders). Several of these applications have severe dimensional constraints that would prevent the use of cavities operating in the TM110 mode. A number of compact designs for deflecting/crabbing cavities have been designed and are under development; their properties are presented.
	Slides THIOA03 [5.243 MB]