PAC2013 - List of Authors (Park, H.)

Paper	Title	Page
WEPAC40	Mechanical Analysis of the 400 MHz RF-Dipole Crabbing Cavity Prototype for LHC High Luminosity Upgrade	862
	S.U. De Silva, J.R. Delayen, H. Park ODU, Norfolk, Virginia, USA S.U. De Silva, J.R. Delayen, H. Park JLAB, Newport News, Virginia, USA Z. Li SLAC, Menlo Park, California, USA
	The proposed LHC high luminosity upgrade requires two crabbing systems in increasing the peak luminosity, operating both vertically and horizontally at two interaction points of IP1 and IP5. The required system has tight dimensional constraints and needs to achieve higher operational gradients. A proof-of-principle 400 MHz crabbing cavity design has been successfully tested and has proven to be an ideal candidate for the crabbing system. The cylindrical proof-of-principle rf-dipole design has been adapted in to a square shaped design to further meet the dimensional requirements. The new rf-dipole design has been optimized in meeting the requirements in rf-properties, higher order mode damping, and multipole components. A crabbing system in a cryomodule is expected to be tested on the SPS beam line prior to the test at LHC. The new prototype is required to achieve the mechanical and thermal specifications of the SPS test followed by the test at LHC. This paper discusses the detailed mechanical and thermal analysis in minimizing Lorentz force detuning and sensitivity to liquid He pressure fluctuations.

WEPAC41	Comparison of Electromagnetic, Thermal and Mechanical Calculations with RF Test Results in RF-Dipole Deflecting/Crabbing Cavities	865
	H. Park, S.U. De Silva, J.R. Delayen JLAB, Newport News, Virginia, USA S.U. De Silva, J.R. Delayen, H. Park ODU, Norfolk, Virginia, USA
	The current requirements of higher gradients and strict dimensional constraints in the emerging applications have required the designing of compact deflecting and crabbing rf structures. The superconducting rf-dipole cavity is one of the first novel compact designs with attractive properties such as higher gradients, higher shunt impedance and widely separated higher order modes. The recent tests performed on proof-of-principle designs of the rf-dipole geometry at 4.2 K and 2.0 K in a vertical test assembly have proven the designs to achieve higher gradients with higher intrinsic quality factors and easily processed multipacting conditions. The design frequency sensitivity to pressure (df/dp) due to liquid He pressure fluctuations, Lorentz force detuning due to radiation pressure, and thermal and mechanical effects have also been measured during the tests. These effects lead to cavity frequency detuning while in operation and therefore needs to be reduced. This paper presents the detailed comparison of the measurement to the simulation results obtained from ANSYS.

WEPAC41	Comparison of Electromagnetic, Thermal and Mechanical Calculations with RF Test Results in RF-Dipole Deflecting/Crabbing Cavities	865
	H. Park, S.U. De Silva, J.R. Delayen JLAB, Newport News, Virginia, USA S.U. De Silva, J.R. Delayen, H. Park ODU, Norfolk, Virginia, USA
	The current requirements of higher gradients and strict dimensional constraints in the emerging applications have required the designing of compact deflecting and crabbing rf structures. The superconducting rf-dipole cavity is one of the first novel compact designs with attractive properties such as higher gradients, higher shunt impedance and widely separated higher order modes. The recent tests performed on proof-of-principle designs of the rf-dipole geometry at 4.2 K and 2.0 K in a vertical test assembly have proven the designs to achieve higher gradients with higher intrinsic quality factors and easily processed multipacting conditions. The design frequency sensitivity to pressure (df/dp) due to liquid He pressure fluctuations, Lorentz force detuning due to radiation pressure, and thermal and mechanical effects have also been measured during the tests. These effects lead to cavity frequency detuning while in operation and therefore needs to be reduced. This paper presents the detailed comparison of the measurement to the simulation results obtained from ANSYS.

Paper

Title

Page

Mechanical Analysis of the 400 MHz RF-Dipole Crabbing Cavity Prototype for LHC High Luminosity Upgrade

862

S.U. De Silva, J.R. Delayen, H. Park
ODU, Norfolk, Virginia, USA
S.U. De Silva, J.R. Delayen, H. Park
JLAB, Newport News, Virginia, USA
Z. Li
SLAC, Menlo Park, California, USA

The proposed LHC high luminosity upgrade requires two crabbing systems in increasing the peak luminosity, operating both vertically and horizontally at two interaction points of IP1 and IP5. The required system has tight dimensional constraints and needs to achieve higher operational gradients. A proof-of-principle 400 MHz crabbing cavity design has been successfully tested and has proven to be an ideal candidate for the crabbing system. The cylindrical proof-of-principle rf-dipole design has been adapted in to a square shaped design to further meet the dimensional requirements. The new rf-dipole design has been optimized in meeting the requirements in rf-properties, higher order mode damping, and multipole components. A crabbing system in a cryomodule is expected to be tested on the SPS beam line prior to the test at LHC. The new prototype is required to achieve the mechanical and thermal specifications of the SPS test followed by the test at LHC. This paper discusses the detailed mechanical and thermal analysis in minimizing Lorentz force detuning and sensitivity to liquid He pressure fluctuations.

WEPAC41

Comparison of Electromagnetic, Thermal and Mechanical Calculations with RF Test Results in RF-Dipole Deflecting/Crabbing Cavities

865

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

The current requirements of higher gradients and strict dimensional constraints in the emerging applications have required the designing of compact deflecting and crabbing rf structures. The superconducting rf-dipole cavity is one of the first novel compact designs with attractive properties such as higher gradients, higher shunt impedance and widely separated higher order modes. The recent tests performed on proof-of-principle designs of the rf-dipole geometry at 4.2 K and 2.0 K in a vertical test assembly have proven the designs to achieve higher gradients with higher intrinsic quality factors and easily processed multipacting conditions. The design frequency sensitivity to pressure (df/dp) due to liquid He pressure fluctuations, Lorentz force detuning due to radiation pressure, and thermal and mechanical effects have also been measured during the tests. These effects lead to cavity frequency detuning while in operation and therefore needs to be reduced. This paper presents the detailed comparison of the measurement to the simulation results obtained from ANSYS.

WEPAC41

Comparison of Electromagnetic, Thermal and Mechanical Calculations with RF Test Results in RF-Dipole Deflecting/Crabbing Cavities

865

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

The current requirements of higher gradients and strict dimensional constraints in the emerging applications have required the designing of compact deflecting and crabbing rf structures. The superconducting rf-dipole cavity is one of the first novel compact designs with attractive properties such as higher gradients, higher shunt impedance and widely separated higher order modes. The recent tests performed on proof-of-principle designs of the rf-dipole geometry at 4.2 K and 2.0 K in a vertical test assembly have proven the designs to achieve higher gradients with higher intrinsic quality factors and easily processed multipacting conditions. The design frequency sensitivity to pressure (df/dp) due to liquid He pressure fluctuations, Lorentz force detuning due to radiation pressure, and thermal and mechanical effects have also been measured during the tests. These effects lead to cavity frequency detuning while in operation and therefore needs to be reduced. This paper presents the detailed comparison of the measurement to the simulation results obtained from ANSYS.