IPAC2014 - Classification: 07 Accelerator Technology Main Systems / T31 Subsystems, Technology and Components, Other

Paper	Title	Page
MOOCA03	Design of High-power Graphene Beam Window	45
	H.J. Wang, H.T. Jing, H. Qu, J.Y. Tang IHEP, Beijing, People's Republic of China
	Beam window is a key device in high-intensity hadron beam applications, and it is usually used to separate air or other gas environments in the end of beam vacuum duct. Compared with the usually-used window materials such as Inconel alloy, Aluminum alloy and so on, the graphene has extremely high thermal conductivity, high strength and high transparency to high-energy ions. With the maturation of large-size graphene manufacturing technology, we have studied this new-type window for MW-class proton beam. The thermal analyses by the theoretical formula and simulations based on FEA are presented in this paper. Simultaneously, the scattering effect and the lifetime are also discussed. The preliminary results are promising. The same material can also be possibly applied to other devices such as charge-exchange stripping foils, beam monitors and so on.
	Slides MOOCA03 [1.467 MB]
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THOBB03	Novel Device for In-situ Thick Coatings of Long, Small Diameter Accelerator Vacuum Tubes	2834
	A. Hershcovitch, M. Blaskiewicz, J.M. Brennan, W. Fischer, C.J. Liaw, W. Meng, R.J. Todd BNL, Upton, Long Island, New York, USA A.X. Custer, A.A. Dingus, M.Y. Erickson, N.Z. Jamshidi, R.R. Laping, H.J. Poole PVI, Oxnard, California, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. To alleviate the problems of unacceptable ohmic heating and of electron clouds, a 50 cm long cathode magnetron mole was fabricated and successfully operated to copper coat an assembly containing a full-size stainless steel cold bore RHIC magnet tubing connected to two types of RHIC bellows, to which two additional RHIC tubing pipes were connected. To increase cathode lifetime, movable magnet package was developed, and thickest possible cathode was made, with rather challenging target to substrate distance of less than 1.5 cm. The magnetron is mounted on a carriage with spring loaded wheels that successfully crossed bellows and adjusted for variations in vacuum tube diameter, while keeping the magnetron centered. Electrical power and cooling water are fed through a motorized spool driven umbilical cabling system, which is enclosed in a flexible braided metal sleeve. Optimized process to ensure excellent adhesion was developed. Coating adhesion of 10 μm Cu surpassed all industrial tests; exceeded maximum capability of a 12 kg pull test fixture. Details of experimental setup for coating two types of bellows and a full-scale magnet tube sandwiched between them will be presented.
	Slides THOBB03 [2.033 MB]
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THPRO049	Magnet AC Analysis of a Taiwan Light Source Booster	2977
	H.C. Chen, H.H. Chen, S. Fann, S.J. Huang, A.P. Lee, J.A. Li, C.C. Liang, Y.K. Lin NSRRC, Hsinchu, Taiwan
	The Response Surface Methodology (RSM), is used to study the optimization process of magnet AC in the booster for Taiwan Light Source (TLS) in National Synchrotron Radiation Research Center (NSRRC). A study model was constructed based on the Artificial Neural Network (ANN) theory. The theoretical model and optimization procedure were both implemented to evaluate the model. The details of the study will be reported in this paper.
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THPME072	Delivery of Special Magnets for the MedAustron Project	3403
	T. Kramer, M.G. Atanasov, R.A. Barlow, M.J. Barnes, J. Borburgh, L. Ducimetière, T. Fowler, M. Hourican, V. Mertens, A. Prost CERN, Geneva, Switzerland T. Stadlbauer EBG MedAustron, Wr. Neustadt, Austria
	Ten different types of kickers, bumpers, and electrostatic and magnetic septa, along with certain power supplies and associated control system components, have been designed in a collaboration between CERN and MedAustron for an ion therapy centre in Wr. Neustadt (Austria). This paper focuses on the status of the special magnets work package and the improvements applied during the production. The design parameters are compared with data from measurements, hardware tests and initial commissioning. The major factors contributing to the successful completion of the work package are highlighted.
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THPRI040	Study of Geometrical Parameters and their Tolerances in Optimization of Accelerating Cells of Side Coupled Linac	3850
	S. Zarei Nuclear Science and Technology Research, InstituteRadiation Application School, Tehran, Iran F. AbbasiDavani, S. Ahmadiannamin, F. Ghasemi sbu, Tehran, Iran M. Lamehi Rashti IPM, Tehran, Iran
	After choosing the suitable geometry for accelerating cavity, evaluation of geometrical parameters effects on radio frequency characteristics is essential. In this paper after study of priority of geometrical parameters in optimization of accelerating cells of Side Coupled Linac, according to obtained results, new design of s-band accelerating cavity is suggested. By frequency sensitivity study of new dimensions, we can choose best technique to tune the accelerating cavity during magnetic coupling-hole adjustment.
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THPRI079	RF BREAKDOWN IN A GAS-FILLED TE01 CAVITY	3952
	F.Y. Wang, C. Adolphsen, C.D. Nantista SLAC, Menlo Park, California, USA
	An L-band (1.3 GHz) TE01 mode pillbox cavity has been designed to study rf breakdown in gas. Since there are no surface electric fields, effects from the electron interaction with the surface should not be present as in the DC breakdown case. A CCD camera was used to measure the integrated light pattern through holes in the cavity, and an ultrafast diode was used to observed the evolution of the plasma during breakdown. Some preliminary results of the tests are presented in this paper.
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THPRI099	Constructing and Installation of TPS Front End	4007
	Y.T. Cheng, Y.T. Cheng, J. -Y. Chuang, C.K. Kuan, T.Y. Lee, H.Y. Lin, P.A. Lin, Y.K. Liu NSRRC, Hsinchu, Taiwan
	National Synchrotron Radiation Research Center (NSRRC) in Taiwan is completing the construction of Taiwan Photon Source (TPS) synchrotron accelerator project. This 3GeV, 500mA beam current 3rd generation synchrotron accelerator will have total of 7 insertion device beam lines at day one. Corresponding front ends have been design and fabricated. Installation and craning is underway. Current status of frond end are reported and presented in this paper.
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THPRI100	Distributed Cooling System for the AREAL Test Facility	4010
	V. V. Vardanyan, G.A. Amatuni, V.S. Avagyan, A.A. Gevorgyan, B. Grigoryan, T.H. Mkrtchyan, V. Sahakyan, A.S. Simonyan, A.V. Tsakanian, A. Vardanyan CANDLE SRI, Yerevan, Armenia
	Following the design specifications of the Advanced Research Electron Accelerator Laboratory (AREAL), a reliable distributed cooling system for the AREAL linear accelerator has been developed. The cooling system provides a high accuracy temperature control for the electron gun, klystron and the magnets. The main requirements and technical solutions for various accelerator components cooling units are presented, including the local and remote control.
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THPRI102	Energy Effciency of Particle Accelerators - A Networking Effort within the EUCARD² Program	4016
	J. Stadlmann, P.J. Spiller GSI, Darmstadt, Germany R. Gehring KIT, Karlsruhe, Germany E. Jensen CERN, Geneva, Switzerland T.I. Parker ESS, Lund, Sweden M. Seidel PSI, Villigen PSI, Switzerland
	Funding: EuCARD² is co-funded by the partners and the European Commission under Capacities 7th Framework Programme, Grant Agreement 312453 EuCARD² is an Integrating Activity Project for coordinated Research and Development on Particle Accelerators, co-funded by the European Commission under the FP7 Capacities Programme. Within the network EnEfficient we address topics around energy efficiency of research accelerators. The ambitious scientific research goals of modern accelerator facilities lead to high requirements in beam power and beam quality for those research accelerators. In conjunction with the user’s needs the power consumption and environmental impact of the research facilities becomes a major factor in the perception of both funding agencies and the general public. In this Network we combine and focus the R&D done individually at different research centers into a series of workshops. We cover the topics “Energy recovery from cooling circuits “, “Higher electronic efficiency RF power generation“, “Short term energy storage systems”, “Virtual power plants” and “Beam transfer channels with low power consumption”. Our network activities are naturally open to external participants. With this work we will introduce our energy efficiency topics to interested participants and contributors from the whole community.
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THPRI103	Improvement of the Run-time of 35 mbar Helium Gas Pumping Units for the Superconducting Linear Accelerator S-DALINAC	4019
	J. Conrad, F. Hug, T. Kürzeder, N. Pietralla TU Darmstadt, Darmstadt, Germany
	Funding: Work supported by DFG through SFB 634 The superconducting Darmstadt linear accelerator S-DALINAC has been designed to provide electron beams of up to 130 MeV for nuclear and astrophysical experiments. The accelerating cavities are operated in a liquid helium bath at 2 K. To achieve this temperature the cryostat has to be pumped down to a pressure of 35 mbar which was done by a system of pumping units connected in series, when the accelerator started its operation in 1991. In 2005 this system was replaced by four parallel switched pumping stations. In the first three years of their operation, the reliability of the accelerator was very poor due to repeated breakdowns of the pumping stations caused by overheating. In addition the high temperatures lead to an early decay of the gaskets used. The problem was solved by installing oil cooling systems and more appropriate shaft sleeves at the pumping stations. We will report on the technical efforts we made and thereby further increased the availability of the accelerator significantly. Also we will give a review on our experiences in maintenance procedures.
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THPRI104	Design and Fabrication of Bunch Compressor Support System for PAL XFEL	4022
	H.-G. Lee, Y.-G. Jung, H.-S. Kang, D.E. Kim, K.W. Kim, S.B. Lee, D.H. Na, B.G. Oh, K.-H. Park, H.S. Suh PAL, Pohang, Kyungbuk, Republic of Korea
	Pohang Accelerator Laboratory(PAL) is developing a SASE X-ray Free Electron Laser based on 10 GeV linear accelerator. Bunch compressor support systems are developed to be used for the linear accelerator tunnel. The support system design is based on an asymmetric four-dipole magnet chicane in which asymmetry and variable R56. can be optimized. This flexibility is achieved by allowing the middle two dipole magnets to move transversely. Moving system consist of servo motor, rodless ball screw actuator and linear encoder. In this paper, we describe the design of the stages used for precise movement of the bunch compressor magnets and associated diagnostics components.
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THPRI105	Determination of Magnetic Multipoles using a Hall Probe	4025
	J. Campmany, J. Marcos, V. Massana CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
	In this work we present a method that allows determining the harmonic content of the magnetic field generated by an accelerator magnet using a Hall probe bench. The method is based on measuring the three components of the magnetic field on a cylindrical surface parallel to the longitudinal axis of the magnet. Such a measurement is accomplished by carrying out a series of on-the-fly scans for a series of straight lines whose transversal coordinates lay on a circle. The Fourier decomposition of the magnetic field along a circle at a given longitudinal position yields the harmonic terms of the field at a reference radius equal to the circle’s radius. As a result the method provides the longitudinal dependence of the harmonic terms, and in particular it allows analyzing their behavior in the fringe field region. We present an example of the application of this method to the measurement of a quadrupole of the Storage Ring of ALBA. A comparison with the integrated results provided by a rotating coil bench is also shown.
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THPRI106	Specialized Technical Services at ESS	4028
	J.G. Weisend, P. Arnold, J. Fydrych, W. Hees, G. Hulla, F. Jensen, J.M. Jurns, P. Ladd, G. Lanfranco, H. Spoelstra, X. Wang ESS, Lund, Sweden
	The European Spallation Source (ESS), a world class lab for neutron science currently under construction in Lund, Sweden requires a number of technical services that extend across the various project areas (accelerator, target and neutron science). These services include: cryogenics, vacuum and technical electrical and cooling systems. This effort constitutes more than 70 million Euros of construction cost. Rather than have separate support groups in each of the project areas, ESS has created a Specialized Technical Services group within the Accelerator Division to provide these services. This approach permits standardization, development of synergies and improved communication. The STS group also provides cryomodule testing and accelerator infrastructure and installation to the accelerator project. This paper describes the scope of work, current design status and future plans for Specialized Technical services at ESS.
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THPRI108	Manufacturing and Inspecting Supporting Tables for Front End in Taiwan Photon Source	4031
	P.A. Lin, K.H. Hsu, C.K. Kuan, C.-S. Lin, H.Y. Lin, I.C. Sheng NSRRC, Hsinchu, Taiwan
	Taiwan Photon Source is the second accelerator constructed by National Synchrotron Radiation Research Center with energy 3 GeV and 500 mA beam current. In order to install and support front end components those table are designed and constructed. The results of manufacturing and inspecting tables are one of the primary factors that will directly affect the final confining aperture to the end usres. Those supporting table has six types and are all designed and simulated by Solidworks. Different alignment and measurement tools are utilized to inspect these tables. In addition, some results of final post-installation measurement and vibration test are also reported.
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THPRI111	Higher Order Mode Absorbers for High Current ERL Applications	4037
	R.G. Eichhorn, J.V. Conway, Y. He, Y. Li, T.I. O'Connel, P. Quigley, J. Sears, V.D. Shemelin Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	Efficient damping of the higher-order modes (HOMs) of the superconducting cavities is essential for any high current linac, especially for the proposed energy recovery linac at Cornell that aims for high beam currents and short bunches. This contribution will present the design and first result on the HOM absorbers built for the Main Linac Cryomodule (MLC).
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THPRI112	Basic Research on RF Absorbing Ceramics for Beam Line HOM Absorbers	4040
	R.G. Eichhorn, P. Quigley, V.D. Shemelin Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA M. Carty Alfred University, Alfred, New York, USA J. Matteson, A. Rae NanoMaterials Innovation Center LLC, Painted Post, USA
	Higher Order Mode (HOM) absorbers for future high current machines have been a challenging component for many years. Even though many different materials are commercially, none of them seems to fully qualify for accelerator applications. Some of them are brittle or chippy, others porous, have small bandwidth of absorption, a high dc resistivity leading to charge-up or are unreliable in terms of batch to batch variations. Alfred University and Cornell University have recently partnered in developing a dedicated absorber ceramic material that tries to overcome these limitations. We will report on results from small samples of different compositions we produced based on SiC, graphene and graphite.
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THPRI113	Spallation Neutron Source Cryogenic Test Facility Horizontal Test Apparatus Operation	4043
	B. DeGraff, B.S. Hannah, T.S. Neustadt, J. Saunders ORNL RAD, Oak Ridge, Tennessee, USA R. Afanador, M. Doleans, M.P. Howell, S.-H. Kim, C.J. McMahan ORNL, Oak Ridge, Tennessee, USA
	Funding: This work was supported by SNS through UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. DOE. The Spallation Neutron Source (SNS) has built Superconducting Radio Frequency (SRF) processing and testing facilities to support improvement programs and future upgrades. The Cryogenic Test Facility (CTF) system is capable of delivering liquid helium at 4.5K to different test apparatus in support of SRF testing. This paper describes the final stages of fabrication, commissioning and the initial operation of the Horizontal Test Apparatus (HTA). The HTA allows for cold testing of single jacketed medium-beta or high-beta SRF cavities. Heat loads, capacities, and other performance data collected during operation will be presented. Cavity testing lifecycle for plasma processing research and development will be discussed. System changes to allow for 2K helium operation in the HTA will also be addressed.
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THPRI114	Apparatus and Technique for Measuring Low RF Resistivity of Tube Coatings at Cryogenic Temperatures	4046
	A. Hershcovitch, M. Blaskiewicz, J.M. Brennan, J. Brodowski, W. Fischer, R. Than, J.E. Tuozzolo BNL, Upton, Long Island, New York, USA A.X. Custer, A.A. Dingus, M.Y. Erickson, N.Z. Jamshidi, H.J. Poole PVI, Oxnard, California, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. An in-situ technique for coating stainless steel vacuum tubes with Cu was developed to mitigate the problems of wall resistivity that leads to unacceptable ohmic heating of superconducting magnets cold bore and electron cloud generation in RHIC that can limit future machine luminosity enhancement. Room temperature RF resistivity of 10 μm Cu coated stainless steel RHIC beam tube has conductivity close to copper tubing. Before coating the RHIC beam pipe with copper, it is imperative to test the Cu coating’s conductivity at cryogenic. A folded quarter wave resonator structure has been designed and built for insertion in a cryogenic system to measure RF resistivity of copper coated RHIC tubing at liquid helium temperatures. The design is based on making the resonator structure out of a superconducting material such that the copper coating is the most lossy material. RHIC tubing samples prepared with different magnetron sputtering deposition modes are to be optimized by iterative processes. Additionally, this device can also be used for the development of better, cheaper SRF cavities and electron guns. The apparatus and its design details will be presented.
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THPRI115	Measuring and Aligning Accelerator Components to the Nanometre Scale	4049
	N. Catalán Lasheras, H. Mainaud Durand, M. Modena CERN, Geneva, Switzerland
	First tests have shown that the precision and accuracy required for linear colliders and other future accelerators of 10 micrometers cannot be reached with a process based on independent fiducializations of single components. Indeed, the systematic and random errors at each step add up during the process with the final accuracy of each component center well above the target. A new EC-funded training network named PACMAN (a study on Particle Accelerator Components Metrology and Alignment to the Nanometer scale) will propose and develop an alternative solution integrating all the alignment steps and a large number of technologies at the same time and location, in order to gain the required precision and accuracy. The network composed of seven industrial partners and nine universities and research centers will be based at CERN where ten doctoral students will explore the technology limitations of metrology. They will develop new techniques to measure magnetic and microwave fields, optical and non-contact sensors and survey methods as well as high accuracy mechanics, nano-positioning and vibration sensors.
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Paper

Title

Page

Design of High-power Graphene Beam Window

45

H.J. Wang, H.T. Jing, H. Qu, J.Y. Tang
IHEP, Beijing, People's Republic of China

Beam window is a key device in high-intensity hadron beam applications, and it is usually used to separate air or other gas environments in the end of beam vacuum duct. Compared with the usually-used window materials such as Inconel alloy, Aluminum alloy and so on, the graphene has extremely high thermal conductivity, high strength and high transparency to high-energy ions. With the maturation of large-size graphene manufacturing technology, we have studied this new-type window for MW-class proton beam. The thermal analyses by the theoretical formula and simulations based on FEA are presented in this paper. Simultaneously, the scattering effect and the lifetime are also discussed. The preliminary results are promising. The same material can also be possibly applied to other devices such as charge-exchange stripping foils, beam monitors and so on.

Slides MOOCA03 [1.467 MB]

DOI •

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THOBB03

Novel Device for In-situ Thick Coatings of Long, Small Diameter Accelerator Vacuum Tubes

2834

A. Hershcovitch, M. Blaskiewicz, J.M. Brennan, W. Fischer, C.J. Liaw, W. Meng, R.J. Todd
BNL, Upton, Long Island, New York, USA
A.X. Custer, A.A. Dingus, M.Y. Erickson, N.Z. Jamshidi, R.R. Laping, H.J. Poole
PVI, Oxnard, California, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
To alleviate the problems of unacceptable ohmic heating and of electron clouds, a 50 cm long cathode magnetron mole was fabricated and successfully operated to copper coat an assembly containing a full-size stainless steel cold bore RHIC magnet tubing connected to two types of RHIC bellows, to which two additional RHIC tubing pipes were connected. To increase cathode lifetime, movable magnet package was developed, and thickest possible cathode was made, with rather challenging target to substrate distance of less than 1.5 cm. The magnetron is mounted on a carriage with spring loaded wheels that successfully crossed bellows and adjusted for variations in vacuum tube diameter, while keeping the magnetron centered. Electrical power and cooling water are fed through a motorized spool driven umbilical cabling system, which is enclosed in a flexible braided metal sleeve. Optimized process to ensure excellent adhesion was developed. Coating adhesion of 10 μm Cu surpassed all industrial tests; exceeded maximum capability of a 12 kg pull test fixture. Details of experimental setup for coating two types of bellows and a full-scale magnet tube sandwiched between them will be presented.

Slides THOBB03 [2.033 MB]

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THPRO049

Magnet AC Analysis of a Taiwan Light Source Booster

2977

H.C. Chen, H.H. Chen, S. Fann, S.J. Huang, A.P. Lee, J.A. Li, C.C. Liang, Y.K. Lin
NSRRC, Hsinchu, Taiwan

The Response Surface Methodology (RSM), is used to study the optimization process of magnet AC in the booster for Taiwan Light Source (TLS) in National Synchrotron Radiation Research Center (NSRRC). A study model was constructed based on the Artificial Neural Network (ANN) theory. The theoretical model and optimization procedure were both implemented to evaluate the model. The details of the study will be reported in this paper.

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THPME072

Delivery of Special Magnets for the MedAustron Project

3403

T. Kramer, M.G. Atanasov, R.A. Barlow, M.J. Barnes, J. Borburgh, L. Ducimetière, T. Fowler, M. Hourican, V. Mertens, A. Prost
CERN, Geneva, Switzerland
T. Stadlbauer
EBG MedAustron, Wr. Neustadt, Austria

Ten different types of kickers, bumpers, and electrostatic and magnetic septa, along with certain power supplies and associated control system components, have been designed in a collaboration between CERN and MedAustron for an ion therapy centre in Wr. Neustadt (Austria). This paper focuses on the status of the special magnets work package and the improvements applied during the production. The design parameters are compared with data from measurements, hardware tests and initial commissioning. The major factors contributing to the successful completion of the work package are highlighted.

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THPRI040

Study of Geometrical Parameters and their Tolerances in Optimization of Accelerating Cells of Side Coupled Linac

3850

S. Zarei
Nuclear Science and Technology Research, InstituteRadiation Application School, Tehran, Iran
F. AbbasiDavani, S. Ahmadiannamin, F. Ghasemi
sbu, Tehran, Iran
M. Lamehi Rashti
IPM, Tehran, Iran

After choosing the suitable geometry for accelerating cavity, evaluation of geometrical parameters effects on radio frequency characteristics is essential. In this paper after study of priority of geometrical parameters in optimization of accelerating cells of Side Coupled Linac, according to obtained results, new design of s-band accelerating cavity is suggested. By frequency sensitivity study of new dimensions, we can choose best technique to tune the accelerating cavity during magnetic coupling-hole adjustment.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI040

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THPRI079

RF BREAKDOWN IN A GAS-FILLED TE01 CAVITY

3952

F.Y. Wang, C. Adolphsen, C.D. Nantista
SLAC, Menlo Park, California, USA

An L-band (1.3 GHz) TE01 mode pillbox cavity has been designed to study rf breakdown in gas. Since there are no surface electric fields, effects from the electron interaction with the surface should not be present as in the DC breakdown case. A CCD camera was used to measure the integrated light pattern through holes in the cavity, and an ultrafast diode was used to observed the evolution of the plasma during breakdown. Some preliminary results of the tests are presented in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI079

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THPRI099

Constructing and Installation of TPS Front End

4007

Y.T. Cheng, Y.T. Cheng, J. -Y. Chuang, C.K. Kuan, T.Y. Lee, H.Y. Lin, P.A. Lin, Y.K. Liu
NSRRC, Hsinchu, Taiwan

National Synchrotron Radiation Research Center (NSRRC) in Taiwan is completing the construction of Taiwan Photon Source (TPS) synchrotron accelerator project. This 3GeV, 500mA beam current 3rd generation synchrotron accelerator will have total of 7 insertion device beam lines at day one. Corresponding front ends have been design and fabricated. Installation and craning is underway. Current status of frond end are reported and presented in this paper.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI099

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THPRI100

Distributed Cooling System for the AREAL Test Facility

4010

V. V. Vardanyan, G.A. Amatuni, V.S. Avagyan, A.A. Gevorgyan, B. Grigoryan, T.H. Mkrtchyan, V. Sahakyan, A.S. Simonyan, A.V. Tsakanian, A. Vardanyan
CANDLE SRI, Yerevan, Armenia

Following the design specifications of the Advanced Research Electron Accelerator Laboratory (AREAL), a reliable distributed cooling system for the AREAL linear accelerator has been developed. The cooling system provides a high accuracy temperature control for the electron gun, klystron and the magnets. The main requirements and technical solutions for various accelerator components cooling units are presented, including the local and remote control.

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THPRI102

Energy Effciency of Particle Accelerators - A Networking Effort within the EUCARD² Program

4016

J. Stadlmann, P.J. Spiller
GSI, Darmstadt, Germany
R. Gehring
KIT, Karlsruhe, Germany
E. Jensen
CERN, Geneva, Switzerland
T.I. Parker
ESS, Lund, Sweden
M. Seidel
PSI, Villigen PSI, Switzerland

Funding: EuCARD² is co-funded by the partners and the European Commission under Capacities 7th Framework Programme, Grant Agreement 312453
EuCARD² is an Integrating Activity Project for coordinated Research and Development on Particle Accelerators, co-funded by the European Commission under the FP7 Capacities Programme. Within the network EnEfficient we address topics around energy efficiency of research accelerators. The ambitious scientific research goals of modern accelerator facilities lead to high requirements in beam power and beam quality for those research accelerators. In conjunction with the user’s needs the power consumption and environmental impact of the research facilities becomes a major factor in the perception of both funding agencies and the general public. In this Network we combine and focus the R&D done individually at different research centers into a series of workshops. We cover the topics “Energy recovery from cooling circuits “, “Higher electronic efficiency RF power generation“, “Short term energy storage systems”, “Virtual power plants” and “Beam transfer channels with low power consumption”. Our network activities are naturally open to external participants. With this work we will introduce our energy efficiency topics to interested participants and contributors from the whole community.

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THPRI103

Improvement of the Run-time of 35 mbar Helium Gas Pumping Units for the Superconducting Linear Accelerator S-DALINAC

4019

J. Conrad, F. Hug, T. Kürzeder, N. Pietralla
TU Darmstadt, Darmstadt, Germany

Funding: Work supported by DFG through SFB 634
The superconducting Darmstadt linear accelerator S-DALINAC has been designed to provide electron beams of up to 130 MeV for nuclear and astrophysical experiments. The accelerating cavities are operated in a liquid helium bath at 2 K. To achieve this temperature the cryostat has to be pumped down to a pressure of 35 mbar which was done by a system of pumping units connected in series, when the accelerator started its operation in 1991. In 2005 this system was replaced by four parallel switched pumping stations. In the first three years of their operation, the reliability of the accelerator was very poor due to repeated breakdowns of the pumping stations caused by overheating. In addition the high temperatures lead to an early decay of the gaskets used. The problem was solved by installing oil cooling systems and more appropriate shaft sleeves at the pumping stations. We will report on the technical efforts we made and thereby further increased the availability of the accelerator significantly. Also we will give a review on our experiences in maintenance procedures.

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THPRI104

Design and Fabrication of Bunch Compressor Support System for PAL XFEL

4022

H.-G. Lee, Y.-G. Jung, H.-S. Kang, D.E. Kim, K.W. Kim, S.B. Lee, D.H. Na, B.G. Oh, K.-H. Park, H.S. Suh
PAL, Pohang, Kyungbuk, Republic of Korea

Pohang Accelerator Laboratory(PAL) is developing a SASE X-ray Free Electron Laser based on 10 GeV linear accelerator. Bunch compressor support systems are developed to be used for the linear accelerator tunnel. The support system design is based on an asymmetric four-dipole magnet chicane in which asymmetry and variable R56. can be optimized. This flexibility is achieved by allowing the middle two dipole magnets to move transversely. Moving system consist of servo motor, rodless ball screw actuator and linear encoder. In this paper, we describe the design of the stages used for precise movement of the bunch compressor magnets and associated diagnostics components.

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THPRI105

Determination of Magnetic Multipoles using a Hall Probe

4025

J. Campmany, J. Marcos, V. Massana
CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain

In this work we present a method that allows determining the harmonic content of the magnetic field generated by an accelerator magnet using a Hall probe bench. The method is based on measuring the three components of the magnetic field on a cylindrical surface parallel to the longitudinal axis of the magnet. Such a measurement is accomplished by carrying out a series of on-the-fly scans for a series of straight lines whose transversal coordinates lay on a circle. The Fourier decomposition of the magnetic field along a circle at a given longitudinal position yields the harmonic terms of the field at a reference radius equal to the circle’s radius. As a result the method provides the longitudinal dependence of the harmonic terms, and in particular it allows analyzing their behavior in the fringe field region. We present an example of the application of this method to the measurement of a quadrupole of the Storage Ring of ALBA. A comparison with the integrated results provided by a rotating coil bench is also shown.

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THPRI106

Specialized Technical Services at ESS

4028

J.G. Weisend, P. Arnold, J. Fydrych, W. Hees, G. Hulla, F. Jensen, J.M. Jurns, P. Ladd, G. Lanfranco, H. Spoelstra, X. Wang
ESS, Lund, Sweden

The European Spallation Source (ESS), a world class lab for neutron science currently under construction in Lund, Sweden requires a number of technical services that extend across the various project areas (accelerator, target and neutron science). These services include: cryogenics, vacuum and technical electrical and cooling systems. This effort constitutes more than 70 million Euros of construction cost. Rather than have separate support groups in each of the project areas, ESS has created a Specialized Technical Services group within the Accelerator Division to provide these services. This approach permits standardization, development of synergies and improved communication. The STS group also provides cryomodule testing and accelerator infrastructure and installation to the accelerator project. This paper describes the scope of work, current design status and future plans for Specialized Technical services at ESS.

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THPRI108

Manufacturing and Inspecting Supporting Tables for Front End in Taiwan Photon Source

4031

P.A. Lin, K.H. Hsu, C.K. Kuan, C.-S. Lin, H.Y. Lin, I.C. Sheng
NSRRC, Hsinchu, Taiwan

Taiwan Photon Source is the second accelerator constructed by National Synchrotron Radiation Research Center with energy 3 GeV and 500 mA beam current. In order to install and support front end components those table are designed and constructed. The results of manufacturing and inspecting tables are one of the primary factors that will directly affect the final confining aperture to the end usres. Those supporting table has six types and are all designed and simulated by Solidworks. Different alignment and measurement tools are utilized to inspect these tables. In addition, some results of final post-installation measurement and vibration test are also reported.

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THPRI111

Higher Order Mode Absorbers for High Current ERL Applications

4037

R.G. Eichhorn, J.V. Conway, Y. He, Y. Li, T.I. O'Connel, P. Quigley, J. Sears, V.D. Shemelin
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

Efficient damping of the higher-order modes (HOMs) of the superconducting cavities is essential for any high current linac, especially for the proposed energy recovery linac at Cornell that aims for high beam currents and short bunches. This contribution will present the design and first result on the HOM absorbers built for the Main Linac Cryomodule (MLC).

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THPRI112

Basic Research on RF Absorbing Ceramics for Beam Line HOM Absorbers

4040

R.G. Eichhorn, P. Quigley, V.D. Shemelin
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
M. Carty
Alfred University, Alfred, New York, USA
J. Matteson, A. Rae
NanoMaterials Innovation Center LLC, Painted Post, USA

Higher Order Mode (HOM) absorbers for future high current machines have been a challenging component for many years. Even though many different materials are commercially, none of them seems to fully qualify for accelerator applications. Some of them are brittle or chippy, others porous, have small bandwidth of absorption, a high dc resistivity leading to charge-up or are unreliable in terms of batch to batch variations. Alfred University and Cornell University have recently partnered in developing a dedicated absorber ceramic material that tries to overcome these limitations. We will report on results from small samples of different compositions we produced based on SiC, graphene and graphite.

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THPRI113

Spallation Neutron Source Cryogenic Test Facility Horizontal Test Apparatus Operation

4043

B. DeGraff, B.S. Hannah, T.S. Neustadt, J. Saunders
ORNL RAD, Oak Ridge, Tennessee, USA
R. Afanador, M. Doleans, M.P. Howell, S.-H. Kim, C.J. McMahan
ORNL, Oak Ridge, Tennessee, USA

Funding: This work was supported by SNS through UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. DOE.
The Spallation Neutron Source (SNS) has built Superconducting Radio Frequency (SRF) processing and testing facilities to support improvement programs and future upgrades. The Cryogenic Test Facility (CTF) system is capable of delivering liquid helium at 4.5K to different test apparatus in support of SRF testing. This paper describes the final stages of fabrication, commissioning and the initial operation of the Horizontal Test Apparatus (HTA). The HTA allows for cold testing of single jacketed medium-beta or high-beta SRF cavities. Heat loads, capacities, and other performance data collected during operation will be presented. Cavity testing lifecycle for plasma processing research and development will be discussed. System changes to allow for 2K helium operation in the HTA will also be addressed.

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THPRI114

Apparatus and Technique for Measuring Low RF Resistivity of Tube Coatings at Cryogenic Temperatures

4046

A. Hershcovitch, M. Blaskiewicz, J.M. Brennan, J. Brodowski, W. Fischer, R. Than, J.E. Tuozzolo
BNL, Upton, Long Island, New York, USA
A.X. Custer, A.A. Dingus, M.Y. Erickson, N.Z. Jamshidi, H.J. Poole
PVI, Oxnard, California, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
An in-situ technique for coating stainless steel vacuum tubes with Cu was developed to mitigate the problems of wall resistivity that leads to unacceptable ohmic heating of superconducting magnets cold bore and electron cloud generation in RHIC that can limit future machine luminosity enhancement. Room temperature RF resistivity of 10 μm Cu coated stainless steel RHIC beam tube has conductivity close to copper tubing. Before coating the RHIC beam pipe with copper, it is imperative to test the Cu coating’s conductivity at cryogenic. A folded quarter wave resonator structure has been designed and built for insertion in a cryogenic system to measure RF resistivity of copper coated RHIC tubing at liquid helium temperatures. The design is based on making the resonator structure out of a superconducting material such that the copper coating is the most lossy material. RHIC tubing samples prepared with different magnetron sputtering deposition modes are to be optimized by iterative processes. Additionally, this device can also be used for the development of better, cheaper SRF cavities and electron guns. The apparatus and its design details will be presented.

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THPRI115

Measuring and Aligning Accelerator Components to the Nanometre Scale

4049

N. Catalán Lasheras, H. Mainaud Durand, M. Modena
CERN, Geneva, Switzerland

First tests have shown that the precision and accuracy required for linear colliders and other future accelerators of 10 micrometers cannot be reached with a process based on independent fiducializations of single components. Indeed, the systematic and random errors at each step add up during the process with the final accuracy of each component center well above the target. A new EC-funded training network named PACMAN (a study on Particle Accelerator Components Metrology and Alignment to the Nanometer scale) will propose and develop an alternative solution integrating all the alignment steps and a large number of technologies at the same time and location, in order to gain the required precision and accuracy. The network composed of seven industrial partners and nine universities and research centers will be based at CERN where ten doctoral students will explore the technology limitations of metrology. They will develop new techniques to measure magnetic and microwave fields, optical and non-contact sensors and survey methods as well as high accuracy mechanics, nano-positioning and vibration sensors.

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