IPAC2016 - List of Keywords (closed-orbit)

Paper	Title	Other Keywords	Page
MOPMB038	Development of Shoebox BPM for Xi‘an Proton Application Facility	coupling, simulation, proton, impedance	175
	W. Wang, X. Guan, W.-H. Huang, X.W. Wang, Z. Yang, H.Y. Zhang, S.X. Zheng TUB, Beijing, People's Republic of China M.T. Qiu, Z.M. Wang State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Shannxi, People's Republic of China
	In this paper, development of the Shoebox BPM is presented which can be applied for the measurement of turn-by-turn position data, closed orbit and tune of Xi'an Proton Application Facility (XiPAF). The preliminary design of the physical dimensions including the electrode aperture, the pipe aperture and the gap between the two electrodes is performed by calculating their effects on BPM response respectively with the equivalent circuit model. Furthermore, the mechanical structure of the Shoebox BPM is optimized by CST simulation to achieve better performance. The dependency of the BPM sensitivity and zero offset on the frequency is diminished by adding one isolating ring, which decreases coupling capacitance of electrodes and compensates ground capacitance difference of the two electrodes. Finally one prototype of the Shoebox BPM has been fabricated and tested offline. Results show that relative position measurement error due to frequency dependency of sensitivity is less than 1% and absolute measurement error due to frequency dependency of zero offset is expected to be less than 0.1 mm.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB038
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MOPMR018	Beam Position Monitor for Circular Proton Accelerators	hadron, controls, instrumentation, interface	267
	M. Žnidarčič, E. Janezic I-Tech, Solkan, Slovenia K. Lang GSI, Darmstadt, Germany
	Position monitoring, tune calculation and subsequent optimization of hadron circular accelerators requires specific instrumentation. Libera Hadron is the newly developed instrument intended for data acquisition and post processing of signals from shoe-box or capacitive type pickups. Development, initial measurements and verification of the instrument performance were conducted in the Instrumentation Technologies' laboratories, followed by the characterization measurements of the unit carried out at Facility for Anti-proton and Ion Research (FAIR) facility. This article discusses the new BPM electronics concept, the tests performed and the performance obtained.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMR018
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TUPMR007	Radiative Recombination Detection to Monitor Electron Cooling Conditions During Low Energy RHIC Operations	ion, electron, quadrupole, detector	1239
	F.S. Carlier, M. Blaskiewicz, K.A. Drees, A.V. Fedotov, W. Fischer, M.G. Minty, C. Montag, G. Robert-Demolaize, P. Thieberger BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. Providing Au-Au collisions in the Relativistic Heavy Ion Collider (RHIC) at energies equal or lower than 10 GeV/nucleon is of particular interest to study the location of a critical point in the QCD phase diagram. To mitigate luminosity limitations arising from intra-beam scattering at such low energies, an electron cooling system is being developed. To achieve cooling, the relative velocities of the electrons and protons need to be small with maximized transverse overlap. Recombination rates of ions with electrons in the electron cooler can provide signals that can be used to tune the energies and transverse overlap to the required conditions. In this paper we take a close look at various detection methods for recombination processes that may be used to approach cooling.
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TUPMW020	Status of the Beam Optics of the Future Hadron-Hadron Collider FCC-hh	collider, dipole, optics, sextupole	1470
	A. Chancé CEA/DSM/IRFU, France D. Boutin, B. Dalena, J. Payet CEA/IRFU, Gif-sur-Yvette, France B.J. Holzer, R. Martin, D. Schulte CERN, Geneva, Switzerland
	Funding: This work was supported by the HORIZON 2020 project EuroCirCol, grant agreement 654305. Following the recommendations of the European Strategy Group for High Energy Physics, CERN launched a design study for possible future circular collider projects, FCC, to investigate their feasibility for high energy physics research. The study covers three options, a proton-proton collider, a circular e⁺/e⁻ collider and a scenario for e-p collisions to study deep inelastic scattering. The present paper describes the beam optics and the lattice design of the Future Hadron-Hadron Collider (FCC-hh). The status of the first order and second order optics of the ring will be shown for collisions at the required centre-of-mass energy of 100 TeV cm.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW020
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WEPOR011	Lattice Matching with Elegant at ELSA	dipole, lattice, quadrupole, simulation	2690
	J.-P. Thiry, W. Hillert ELSA, Bonn, Germany
	The electron stretcher ring ELSA provides a beam of polarized electrons of up to 3.2 GeV energy. To preserve the initial degree of polarization, several depolarizing resonances have to be compensated during the fast energy ramp of 6 GeV/s. Beam depolarization, caused by crossing these resonances is studied using comprehensive numerical calculations. These depend essentially on a precise model of the actual magnetic field distributions, explicitly taking into account misalignments. Hence it is necessary to match the theoretical lattice to the actual accelerator. In a first step the alignment of all magnets has been examined and improved. This was done by using standard survey equipment and precise electronic spirit levels. In a second step the concept of response matrix fitting is used for further, beam based, lattice matching. Particle tracking and optics calculations are carried out using elegant, a fully 6D accelerator toolbox. Lattice matching is done by repeatedly calling elegant and utilizing a modified Levenberg-Marquardt optimizer. In this contribution we will describe our lattice fitting implementation.
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WEPOW029	Solaris Storage Ring Commissioning	storage-ring, radiation, vacuum, optics	2895
	A.I. Wawrzyniak, P.B. Borowiec, L.J. Dudek, K. Karaś, A.M. Marendziak, K. Wawrzyniak, J. Wikłacz, M. Zając Solaris National Synchrotron Radiation Centre, Jagiellonian University, Kraków, Poland C.J. Bocchetta, M. Boruchowski, P. Bulira, P.P. Goryl, A. Kisiel, W.T. Kitka, M.P. Kopec, P. Król, M.J. Stankiewicz, J.J. Wiechecki, L. Żytniak Solaris, Kraków, Poland R. Nietubyć NCBJ, Świerk/Otwock, Poland
	Funding: Work supported by the European Regional Development Fund within the frame of the Innovative Economy Operational Program: POIG.02.01.00-12-213/09 The Solaris storage ring represents a new class of light source that utilizes the innovative concept of a solid iron block containing all the Double Bend Achromat (DBA) magnets. The use of small magnet gaps brings the benefit of high fields but requires vacuum chambers of high me-chanical accuracy and distributed pumping. Due to very tight mechanical tolerances of the magnet blocks and of the vacuum vessels, the installation of the Solaris storage ring was a challenging task. In this paper the commission-ing results and the performance of this novel machine will be discussed.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW029
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WEPOY040	Lattice Translation Between Accelerator Simulation Codes for Superkekb	lattice, solenoid, quadrupole, optics	3077
	D. Zhou, H. Koiso, A. Morita, Y. Ohnishi, K. Oide, H. Sugimoto KEK, Ibaraki, Japan M.E. Biagini INFN/LNF, Frascati (Roma), Italy N. Carmignani, S.M. Liuzzo ESRF, Grenoble, France D. Sagan Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	To improve collaborative studies on beam dynamics for SuperKEKB between several labs, efforts have been made to translate the SAD lattices of SuperKEKB rings to the versions for other codes: AT, Bmad, MAD-X, and PTC. It turns out that lattice translations between these codes are not straightforward because of the complexity of the SuperKEKB lattices. In this paper, we describe our experiences of lattice translations, and present some results of benchmarks for the case of SuperKEKB.
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THPMB009	Model Driven Machine Improvement of COSY Based on ORM Data	quadrupole, optics, dipole, lattice	3240
	C. Weidemann, M. Bai, F. Hinder, B. Lorentz FZJ, Jülich, Germany
	The COoler SYnchrotron in Jülich accelerates and stores unpolarized and polarized proton or deuteron beams in the momentum range between 0.3 GeV/c and 3.65 GeV/c [,]. This, in combination with its diverse capabilities of phase space cooling and the flexibility of the lattice with respect to ion-optical settings makes COSY an ideal test facility for accelerator technology development. High demands on beam control and beam based measurements have to be fulfilled for future experiments such as the proposed precursor experiment for a direct measurement of the electric dipole moment of the deuteron (see [] and references within). The analysis of measured orbit response matrices (ORM), which com- prise the focussing structure of the ring, allows for a better understand- ing of machine imperfections such as gradient errors and misalignments of quadrupole magnets. This contribution presents the development of a MAD-X based LOCO (Linear Optics from Closed Orbits) algorithm [*] in a C++ program aiming to calibrate and correct linear optics as well as improving beam control at COSY. R. Maier, NIM A 390, 1 (1997). S.A. Martin et al., NIM A 236, 249-255 (1985). * D. Eversmann et al. [JEDI Collaboration], Phys. Rev. Lett. 115, 094801 (2015). **** J. Safranek, NIM A 388, 27 (1997).
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB009
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THPMB022	Direct and High Resolution Beta-Function Measurements for Storage Ring Lattice Characterization	quadrupole, betatron, lattice, storage-ring	3272
	W. Li, H. Hao, Y.K. Wu FEL/Duke University, Durham, North Carolina, USA W. Li, W. Xu USTC/NSRL, Hefei, Anhui, People's Republic of China
	Betatron functions are a set of commonly used merits to characterize the lattice performance of a circular accelerator. The betatron functions in many accelerators can be computed using a lattice model trained or calibrated using a set of closed orbit responses, which is exemplified by the widely used LOCO technique. However, for some accelerators, like Duke storage ring with quad-sextupole combined function magnets, LOCO cannot be employed in any straight forward manner. In this case, direct measurements for betatron function are required. One way to determine betatron functions at the location of quadrupoles for a circular accelerator is to use the relationship between the quadrupole strength variations and the corresponding betatron tune change. In this paper, we present a set of carefully developed techniques to accurately measure the betatron functions at the location of quadrupoles, which allow us to achieve extremely high accuracy. Measurement errors will be discussed, and the detailed measurement technique will be present. Finally, we'll report preliminary experimental results of beta function measurements in the Duke storage ring with statistical error on the order of 1%.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB022
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THPMB053	nuSTORM FFAG Decay Ring	lattice, resonance, factory, storage-ring	3369
	J.-B. Lagrange, J. Pasternak Imperial College of Science and Technology, Department of Physics, London, United Kingdom R.B. Appleby, J.M. Garland, H.L. Owen, S.C. Tygier UMAN, Manchester, United Kingdom R.B. Appleby Cockcroft Institute, Warrington, Cheshire, United Kingdom A.D. Bross, A. Liu Fermilab, Batavia, Illinois, USA J. Pasternak STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
	The neutrino beam produced from muons decaying in a storage ring would be an ideal tool for precise neutrino cross section measurements and search for sterile neutrinos due to its precisely known flavour content and spectrum. In the proposed nuSTORM facility pions would be directly injected into a racetrack storage ring, where circulating muon beam would be captured. The storage ring has two options: a FODO solution with large aperture quadrupoles and a racetrack FFAG (Fixed Field Alternating Gradient) using the recent developments in FFAGs. Machine parameters, linear optics design and beam dynamics are discussed in this paper.
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THPMR054	Error Correction for the JLEIC Ion Collider Ring	quadrupole, dynamic-aperture, ion, collider	3528
	G.H. Wei, F. Lin, V.S. Morozov, F.C. Pilat, Y. Zhang JLab, Newport News, Virginia, USA Y. Nosochkov, M.-H. Wang SLAC, Menlo Park, California, USA
	Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contracts No. DE-AC05-06OR23177 and DE-AC02-06CH11357. Work supported also by the U.S. DOE Contract DE-AC02-76SF00515. The sensitivity to misalignment, magnet strength error, and BPM noise is investigated in order to specify design tolerances for the ion collider ring of the Jefferson Lab Electron Ion Collider (JLEIC) project. Those errors, including horizontal, vertical, longitudinal displacement, roll error in transverse plane, strength error of main magnets (dipole, quadrupole, and sextupole), BPM noise, and strength jitter of correctors, cause closed orbit distortion, tune change, beta-beat, coupling, chromaticity problem, etc. These problems generally reduce the dynamic aperture at the Interaction Point (IP). According to real commissioning experiences in other machines, closed orbit correction, tune matching, beta-beat correction, decoupling, and chromaticity correction have been done in the study. Finally, we find that the dynamic aperture at the IP is restored. This paper describes that work.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR054
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THPOR054	Analysis of the SPS Long Term Orbit Drifts	extraction, operation, dipole, injection	3914
	F.M. Velotti, C. Bracco, K. Cornelis, L.N. Drøsdal, M.A. Fraser, B. Goddard, V. Kain, M. Meddahi CERN, Geneva, Switzerland E. Gianfelice-Wendt Fermilab, Batavia, Illinois, USA
	The Super Proton Synchrotron (SPS) is the last accelerator in the Large Hadron Collider (LHC) injector chain, and has to deliver the two high-intensity 450 GeV proton beams to the LHC. The transport from SPS to LHC is done through the two Transfer Lines (TL), TI2 and TI8, for Beam 1 (B1) and Beam 2 (B2) respectively. During the first LHC operation period Run 1, a long term drift of the SPS orbit was observed, causing changes in the LHC injection due to the resulting changes in the TL trajectories. This translated into longer LHC turnaround because of the necessity to periodically correct the TL trajectories in order to preserve the beam quality at injection into the LHC. Different sources for the SPS orbit drifts have been investigated: each of them can account only partially for the total orbit drift observed. In this paper, the possible sources of such drift are described, together with the simulated and measured effect they cause. Possible solutions and countermeasures are also discussed.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR054
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THPOY021	NSLS-II Dedicated Python Tools for Simulation and Analysis	lattice, quadrupole, simulation, controls	4134
	J. Choi BNL, Upton, Long Island, New York, USA
	Funding: DOE contract No: DE-SC0012704 Python is a high-level interpreted programming language. Despite its slow benchmarks, because of its fast coding cycle and dynamic property, the users are increasing fast in all areas. Also, because it does not need special care for the memory management, both professional and non-professional programmers can easily make bug-free code just by concentrating on logics. Furthermore, fast increasing libraries are making the language more and more useful. With these advantages, we developed python tools which simulate and analyze the particle accelerator with some parts being dedicated to NSLS-II operation.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY021
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Paper

Title

Other Keywords

Page

MOPMB038

Development of Shoebox BPM for Xi‘an Proton Application Facility

coupling, simulation, proton, impedance

175

W. Wang, X. Guan, W.-H. Huang, X.W. Wang, Z. Yang, H.Y. Zhang, S.X. Zheng
TUB, Beijing, People's Republic of China
M.T. Qiu, Z.M. Wang
State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Shannxi, People's Republic of China

In this paper, development of the Shoebox BPM is presented which can be applied for the measurement of turn-by-turn position data, closed orbit and tune of Xi'an Proton Application Facility (XiPAF). The preliminary design of the physical dimensions including the electrode aperture, the pipe aperture and the gap between the two electrodes is performed by calculating their effects on BPM response respectively with the equivalent circuit model. Furthermore, the mechanical structure of the Shoebox BPM is optimized by CST simulation to achieve better performance. The dependency of the BPM sensitivity and zero offset on the frequency is diminished by adding one isolating ring, which decreases coupling capacitance of electrodes and compensates ground capacitance difference of the two electrodes. Finally one prototype of the Shoebox BPM has been fabricated and tested offline. Results show that relative position measurement error due to frequency dependency of sensitivity is less than 1% and absolute measurement error due to frequency dependency of zero offset is expected to be less than 0.1 mm.

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MOPMR018

Beam Position Monitor for Circular Proton Accelerators

hadron, controls, instrumentation, interface

267

M. Žnidarčič, E. Janezic
I-Tech, Solkan, Slovenia
K. Lang
GSI, Darmstadt, Germany

Position monitoring, tune calculation and subsequent optimization of hadron circular accelerators requires specific instrumentation. Libera Hadron is the newly developed instrument intended for data acquisition and post processing of signals from shoe-box or capacitive type pickups. Development, initial measurements and verification of the instrument performance were conducted in the Instrumentation Technologies' laboratories, followed by the characterization measurements of the unit carried out at Facility for Anti-proton and Ion Research (FAIR) facility. This article discusses the new BPM electronics concept, the tests performed and the performance obtained.

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TUPMR007

Radiative Recombination Detection to Monitor Electron Cooling Conditions During Low Energy RHIC Operations

ion, electron, quadrupole, detector

1239

F.S. Carlier, M. Blaskiewicz, K.A. Drees, A.V. Fedotov, W. Fischer, M.G. Minty, C. Montag, G. Robert-Demolaize, P. Thieberger
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Providing Au-Au collisions in the Relativistic Heavy Ion Collider (RHIC) at energies equal or lower than 10 GeV/nucleon is of particular interest to study the location of a critical point in the QCD phase diagram. To mitigate luminosity limitations arising from intra-beam scattering at such low energies, an electron cooling system is being developed. To achieve cooling, the relative velocities of the electrons and protons need to be small with maximized transverse overlap. Recombination rates of ions with electrons in the electron cooler can provide signals that can be used to tune the energies and transverse overlap to the required conditions. In this paper we take a close look at various detection methods for recombination processes that may be used to approach cooling.

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TUPMW020

Status of the Beam Optics of the Future Hadron-Hadron Collider FCC-hh

collider, dipole, optics, sextupole

1470

A. Chancé
CEA/DSM/IRFU, France
D. Boutin, B. Dalena, J. Payet
CEA/IRFU, Gif-sur-Yvette, France
B.J. Holzer, R. Martin, D. Schulte
CERN, Geneva, Switzerland

Funding: This work was supported by the HORIZON 2020 project EuroCirCol, grant agreement 654305.
Following the recommendations of the European Strategy Group for High Energy Physics, CERN launched a design study for possible future circular collider projects, FCC, to investigate their feasibility for high energy physics research. The study covers three options, a proton-proton collider, a circular e⁺/e⁻ collider and a scenario for e-p collisions to study deep inelastic scattering. The present paper describes the beam optics and the lattice design of the Future Hadron-Hadron Collider (FCC-hh). The status of the first order and second order optics of the ring will be shown for collisions at the required centre-of-mass energy of 100 TeV cm.

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WEPOR011

Lattice Matching with Elegant at ELSA

dipole, lattice, quadrupole, simulation

2690

J.-P. Thiry, W. Hillert
ELSA, Bonn, Germany

The electron stretcher ring ELSA provides a beam of polarized electrons of up to 3.2 GeV energy. To preserve the initial degree of polarization, several depolarizing resonances have to be compensated during the fast energy ramp of 6 GeV/s. Beam depolarization, caused by crossing these resonances is studied using comprehensive numerical calculations. These depend essentially on a precise model of the actual magnetic field distributions, explicitly taking into account misalignments. Hence it is necessary to match the theoretical lattice to the actual accelerator. In a first step the alignment of all magnets has been examined and improved. This was done by using standard survey equipment and precise electronic spirit levels. In a second step the concept of response matrix fitting is used for further, beam based, lattice matching. Particle tracking and optics calculations are carried out using elegant, a fully 6D accelerator toolbox. Lattice matching is done by repeatedly calling elegant and utilizing a modified Levenberg-Marquardt optimizer. In this contribution we will describe our lattice fitting implementation.

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WEPOW029

Solaris Storage Ring Commissioning

storage-ring, radiation, vacuum, optics

2895

A.I. Wawrzyniak, P.B. Borowiec, L.J. Dudek, K. Karaś, A.M. Marendziak, K. Wawrzyniak, J. Wikłacz, M. Zając
Solaris National Synchrotron Radiation Centre, Jagiellonian University, Kraków, Poland
C.J. Bocchetta, M. Boruchowski, P. Bulira, P.P. Goryl, A. Kisiel, W.T. Kitka, M.P. Kopec, P. Król, M.J. Stankiewicz, J.J. Wiechecki, L. Żytniak
Solaris, Kraków, Poland
R. Nietubyć
NCBJ, Świerk/Otwock, Poland

Funding: Work supported by the European Regional Development Fund within the frame of the Innovative Economy Operational Program: POIG.02.01.00-12-213/09
The Solaris storage ring represents a new class of light source that utilizes the innovative concept of a solid iron block containing all the Double Bend Achromat (DBA) magnets. The use of small magnet gaps brings the benefit of high fields but requires vacuum chambers of high me-chanical accuracy and distributed pumping. Due to very tight mechanical tolerances of the magnet blocks and of the vacuum vessels, the installation of the Solaris storage ring was a challenging task. In this paper the commission-ing results and the performance of this novel machine will be discussed.

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WEPOY040

Lattice Translation Between Accelerator Simulation Codes for Superkekb

lattice, solenoid, quadrupole, optics

3077

D. Zhou, H. Koiso, A. Morita, Y. Ohnishi, K. Oide, H. Sugimoto
KEK, Ibaraki, Japan
M.E. Biagini
INFN/LNF, Frascati (Roma), Italy
N. Carmignani, S.M. Liuzzo
ESRF, Grenoble, France
D. Sagan
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

To improve collaborative studies on beam dynamics for SuperKEKB between several labs, efforts have been made to translate the SAD lattices of SuperKEKB rings to the versions for other codes: AT, Bmad, MAD-X, and PTC. It turns out that lattice translations between these codes are not straightforward because of the complexity of the SuperKEKB lattices. In this paper, we describe our experiences of lattice translations, and present some results of benchmarks for the case of SuperKEKB.

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THPMB009

Model Driven Machine Improvement of COSY Based on ORM Data

quadrupole, optics, dipole, lattice

3240

C. Weidemann, M. Bai, F. Hinder, B. Lorentz
FZJ, Jülich, Germany

The COoler SYnchrotron in Jülich accelerates and stores unpolarized and polarized proton or deuteron beams in the momentum range between 0.3 GeV/c and 3.65 GeV/c [*,**]. This, in combination with its diverse capabilities of phase space cooling and the flexibility of the lattice with respect to ion-optical settings makes COSY an ideal test facility for accelerator technology development. High demands on beam control and beam based measurements have to be fulfilled for future experiments such as the proposed precursor experiment for a direct measurement of the electric dipole moment of the deuteron (see [***] and references within). The analysis of measured orbit response matrices (ORM), which com- prise the focussing structure of the ring, allows for a better understand- ing of machine imperfections such as gradient errors and misalignments of quadrupole magnets. This contribution presents the development of a MAD-X based LOCO (Linear Optics from Closed Orbits) algorithm [****] in a C++ program aiming to calibrate and correct linear optics as well as improving beam control at COSY.
* R. Maier, NIM A 390, 1 (1997).
** S.A. Martin et al., NIM A 236, 249-255 (1985).
*** D. Eversmann et al. [JEDI Collaboration], Phys. Rev. Lett. 115, 094801 (2015).
**** J. Safranek, NIM A 388, 27 (1997).

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THPMB022

Direct and High Resolution Beta-Function Measurements for Storage Ring Lattice Characterization

quadrupole, betatron, lattice, storage-ring

3272

W. Li, H. Hao, Y.K. Wu
FEL/Duke University, Durham, North Carolina, USA
W. Li, W. Xu
USTC/NSRL, Hefei, Anhui, People's Republic of China

Betatron functions are a set of commonly used merits to characterize the lattice performance of a circular accelerator. The betatron functions in many accelerators can be computed using a lattice model trained or calibrated using a set of closed orbit responses, which is exemplified by the widely used LOCO technique. However, for some accelerators, like Duke storage ring with quad-sextupole combined function magnets, LOCO cannot be employed in any straight forward manner. In this case, direct measurements for betatron function are required. One way to determine betatron functions at the location of quadrupoles for a circular accelerator is to use the relationship between the quadrupole strength variations and the corresponding betatron tune change. In this paper, we present a set of carefully developed techniques to accurately measure the betatron functions at the location of quadrupoles, which allow us to achieve extremely high accuracy. Measurement errors will be discussed, and the detailed measurement technique will be present. Finally, we'll report preliminary experimental results of beta function measurements in the Duke storage ring with statistical error on the order of 1%.

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THPMB053

nuSTORM FFAG Decay Ring

lattice, resonance, factory, storage-ring

3369

J.-B. Lagrange, J. Pasternak
Imperial College of Science and Technology, Department of Physics, London, United Kingdom
R.B. Appleby, J.M. Garland, H.L. Owen, S.C. Tygier
UMAN, Manchester, United Kingdom
R.B. Appleby
Cockcroft Institute, Warrington, Cheshire, United Kingdom
A.D. Bross, A. Liu
Fermilab, Batavia, Illinois, USA
J. Pasternak
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom

The neutrino beam produced from muons decaying in a storage ring would be an ideal tool for precise neutrino cross section measurements and search for sterile neutrinos due to its precisely known flavour content and spectrum. In the proposed nuSTORM facility pions would be directly injected into a racetrack storage ring, where circulating muon beam would be captured. The storage ring has two options: a FODO solution with large aperture quadrupoles and a racetrack FFAG (Fixed Field Alternating Gradient) using the recent developments in FFAGs. Machine parameters, linear optics design and beam dynamics are discussed in this paper.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB053

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THPMR054

Error Correction for the JLEIC Ion Collider Ring

quadrupole, dynamic-aperture, ion, collider

3528

G.H. Wei, F. Lin, V.S. Morozov, F.C. Pilat, Y. Zhang
JLab, Newport News, Virginia, USA
Y. Nosochkov, M.-H. Wang
SLAC, Menlo Park, California, USA

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contracts No. DE-AC05-06OR23177 and DE-AC02-06CH11357. Work supported also by the U.S. DOE Contract DE-AC02-76SF00515.
The sensitivity to misalignment, magnet strength error, and BPM noise is investigated in order to specify design tolerances for the ion collider ring of the Jefferson Lab Electron Ion Collider (JLEIC) project. Those errors, including horizontal, vertical, longitudinal displacement, roll error in transverse plane, strength error of main magnets (dipole, quadrupole, and sextupole), BPM noise, and strength jitter of correctors, cause closed orbit distortion, tune change, beta-beat, coupling, chromaticity problem, etc. These problems generally reduce the dynamic aperture at the Interaction Point (IP). According to real commissioning experiences in other machines, closed orbit correction, tune matching, beta-beat correction, decoupling, and chromaticity correction have been done in the study. Finally, we find that the dynamic aperture at the IP is restored. This paper describes that work.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR054

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THPOR054

Analysis of the SPS Long Term Orbit Drifts

extraction, operation, dipole, injection

3914

F.M. Velotti, C. Bracco, K. Cornelis, L.N. Drøsdal, M.A. Fraser, B. Goddard, V. Kain, M. Meddahi
CERN, Geneva, Switzerland
E. Gianfelice-Wendt
Fermilab, Batavia, Illinois, USA

The Super Proton Synchrotron (SPS) is the last accelerator in the Large Hadron Collider (LHC) injector chain, and has to deliver the two high-intensity 450 GeV proton beams to the LHC. The transport from SPS to LHC is done through the two Transfer Lines (TL), TI2 and TI8, for Beam 1 (B1) and Beam 2 (B2) respectively. During the first LHC operation period Run 1, a long term drift of the SPS orbit was observed, causing changes in the LHC injection due to the resulting changes in the TL trajectories. This translated into longer LHC turnaround because of the necessity to periodically correct the TL trajectories in order to preserve the beam quality at injection into the LHC. Different sources for the SPS orbit drifts have been investigated: each of them can account only partially for the total orbit drift observed. In this paper, the possible sources of such drift are described, together with the simulated and measured effect they cause. Possible solutions and countermeasures are also discussed.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR054

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THPOY021

NSLS-II Dedicated Python Tools for Simulation and Analysis

lattice, quadrupole, simulation, controls

4134

J. Choi
BNL, Upton, Long Island, New York, USA

Funding: DOE contract No: DE-SC0012704
Python is a high-level interpreted programming language. Despite its slow benchmarks, because of its fast coding cycle and dynamic property, the users are increasing fast in all areas. Also, because it does not need special care for the memory management, both professional and non-professional programmers can easily make bug-free code just by concentrating on logics. Furthermore, fast increasing libraries are making the language more and more useful. With these advantages, we developed python tools which simulate and analyze the particle accelerator with some parts being dedicated to NSLS-II operation.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY021

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