IPAC2013 - List of Keywords (septum)

Paper	Title	Other Keywords	Page
MOPEA012	Lifetime Studies at Metrology Light Source and ANKA	cavity, optics, electron, scattering	88
	T. Goetsch, J. Feikes, M. Ries, G. Wüstefeld HZB, Berlin, Germany A.-S. Müller KIT, Karlsruhe, Germany
	The Metrology Light Source (MLS), situated in Berlin (Germany) is an electron storage ring operating from 10⁵ MeV to 630 MeV and is serving as the national primary radiation source standard from the near infrared to the vacuum ultraviolet spectral region. In its standard user mode, the lifetime is dominated by the Touschek effect. Measurements and analysis of the Touschek lifetime as a function of beam current and RF-Voltage will be presented and compared to measurements done at the ANKA electron storage ring (Karlsruhe, Germany) which operates at 0.5 to 2.5 GeV. R. Klein et al., Phys. Rev. ST-AB 11, 110701 (2008) ** A.-S. Müller et al., Energy Calibration Of The ANKA Storage Ring, In Proceedings of EPAC 2004

MOPEA053	Status of NSLS-II Booster	booster, dipole, controls, vacuum	196
	S.M. Gurov, A.I. Erokhin, S.E. Karnaev, V.A. Kiselev, E.B. Levichev, A. Polyansky, A.M. Semenov, S.V. Shiyankov, S.V. Sinyatkin, V.V. Smaluk BINP SB RAS, Novosibirsk, Russia H.-C. Hseuh, T.V. Shaftan BNL, Upton, Long Island, New York, USA
	The National Synchrotron Light Source II is a third generation light source under construction at Brookhaven National Laboratory. The project includes a highly optimized 3 GeV electron storage ring, linac pre-injector and full-energy injector-synchrotron. Budker Institute of Nuclear Physics build booster for NSLS-II. The booster should accelerate the electron beam continuously and reliably from a minimum 170 MeV injection energy to a maximum energy of 3.15 GeV and average beam current of 20 mA. The booster shall be capable of multi-bunch and single bunch operation. Pre-comissioning test results of booster components and system are reviewed.

MOPFI007	SIS-18 RF Knock-Out Optimization Studies	extraction, resonance, dipole, synchrotron	297
	M.M. Kirk, D. Ondreka, P.J. Spiller GSI, Darmstadt, Germany
	The extraction efficiency and spill temporal-structure of the SIS-18 heavy ion synchrotron are part of the upgrades to the GSI accelerator complex. Losses to the extraction septum can be minimised through implementation of the Hardt condition resulting however in a poorer quality of the spill microstructure at resolutions of a few microseconds due to lowering of the horizontal chromaticity from its 'natural' value. Ways to improve the extraction efficiency and spill microstructure are investigated with a tracking code. One possibility for improvement may be to use an alternative RF modulation applied to the knock-out exciter.

MOPFI050	Non-local Fast Extraction from the CERN SPS at 100 and 440 GeV	extraction, kicker, simulation, injection	392
	F.M. Velotti, A. Alekou, W. Bartmann, E. Carlier, K. Cornelis, I. Efthymiopoulos, B. Goddard, L.K. Jensen, V. Kain, M. Kowalska, V. Mertens, R. Steerenberg CERN, Geneva, Switzerland
	The Long Straight Section 2 (LSS2) of the CERN SPS is connected with the North Area (NA), to which the beam to date has always been extracted using a resonant extraction technique. For new proposed short- and long-baseline neutrino experiments, a fast single turn extraction to this experimental area is required. As there are no kickers in LSS2, and the integration of any new kickers with the existing electrostatic septum would be problematic, a solution has been developed to fast extract the beam using non-local extraction with other SPS kickers. Two different kicker systems have been used, the injection kicker in LSS1 and the stronger extraction kicker in LSS6 to extract 100 and 440 GeV beam, respectively. For both solutions a large emittance beam was extracted after 5 or 9 full betatron periods. The concept and simulation details are presented with the analysis of the aperture and beam loss considerations and experimental results collected during a series of beam tests.

MOPFI051	Beam Transfer Systems for the LAGUNA-LBNO Long Baseline Neutrino Beam from the CERN SPS	extraction, kicker, injection, target	395
	B. Goddard, W. Bartmann, I. Efthymiopoulos, Y. Papaphilippou, A.S. Parfenova CERN, Geneva, Switzerland
	For the Long Baseline neutrino facility under study at CERN (LAGUNA-LBNO) it is initially planned to extract a 400 GeV beam from the second long straight section in the SPS into the existing transfer channel TT20 leading to the North Area experimental zone, to a new target aligned with a far detector in Finland. In a second phase a new High-Power Proton Synchrotron (HPPS) accelerator is proposed, to give a 2 MW beam at about 50 GeV on the same target. In this paper the beam transfer systems required for the project are outlined, including the new sections of transfer line between the SPL, HPPS and SPS, and from the SPS to the target, and also the injection and extraction systems in the long straight section of the HPPS. The feasibility of a 4 GeV H⁻ injection system is discussed.

MOPFI052	A New Lead Ion Injection System for the CERN SPS with 50 ns Rise Time	injection, kicker, ion, impedance	398
	B. Goddard, O. Aberle, J. Borburgh, E. Carlier, K. Cornelis, L. Ducimetière, L.K. Jensen, T. Kramer, D. Manglunki, A. Mereghetti, V. Mertens, D. Nisbet, B. Salvant, L. Sermeus CERN, Geneva, Switzerland
	The LHC High Luminosity upgrade project includes a performance upgrade for heavy ions. One of the present performance limitations is the rise time of the SPS injection kicker system, which imposes a spacing of at least 220 ns between injected bunch trains at the operational rigidity. A reduction of this rise time to 50 ns for lead ions is requested as part of the suite of measures needed to increase the present design performance by a factor three. A new injection system based on a fast pulsed septum and a fast kicker has been proposed to fulfil this rise time requirement, and to meet all the constraints associated with the existing high intensity proton injection in the same region. This paper describes the concept and the required equipment parameters, and explores the implications of such a system for SPS operation.

MOPFI061	Concept for Elena Extraction and Beam Transfer Elements	extraction, kicker, quadrupole, vacuum	422
	J. Borburgh, B. Balhan, W. Bartmann, T. Fowler, L. Sermeus, G. Vanbavinckhove CERN, Geneva, Switzerland R.A. Baartman TRIUMF, Vancouver, Canada D. Barna University of Tokyo, Tokyo, Japan V. Pricop Transilvania University of Brasov, Brasov, Romania
	In 2011 the ELENA decelerator was approved as a CERN project. Initially one extraction was foreseen, which should use a kicker and a magnetic septum which can be recuperated from an earlier installation. Since then a second extraction has been approved and a new solution was studied using only electric fields to extract the beam. This will be achieved by fast pulsing a separator, allowing single-bunch but also a full single-turn extraction from ELENA towards the experiments. The extraction and transfer requirements of ELENA are described, followed by the principal differences between the magnetic and electric field concepts. The design of electrostatic focussing and bending devices for the transfer lines will be presented. Finally the field quality which can be achieved with the separator and the concept of its power supply will be discussed.

MOPFI063	Progress on Designs for 180 MeV Injection into the ISIS Synchrotron	injection, dipole, synchrotron, stripper	428
	B. Jones, D.J. Adams, B.S. Drumm, M.C. Hughes, A.J. McFarland, C.M. Warsop STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	The ISIS Facility at the Rutherford Appleton Laboratory in the UK produces intense neutron and muon beams for condensed matter research. It operates at 50Hz accelerating beam via a 70 MeV H⁻ linac and an 800 MeV proton synchrotron, delivering a mean beam power of 0.2 MW. As an initial step towards megawatt operations at ISIS, a study of replacement of the existing injector with a new 180 MeV H⁻ linac has recently been completed. This could enable an increase in beam power to approximately 0.5 MW. The ISIS Facility at the Rutherford Appleton Laboratory in the UK produces intense neutron and muon beams for condensed matter research. It accelerates 3×10¹³ protons per pulse (ppp) at 50 Hz through a 70 MeV H− linac and an 800 MeV proton synchrotron, delivering a mean beam power of ~0.2 MW. A favoured first step to upgrade ISIS towards the megawatt regime is replacement of the linac with a new 180 MeV injector described in [1]. Studies of this upgrade, which aims to increase mean beam power up to 0.5 MW are outlined in [2]. This paper reports on recent development of the designs including the injection septum, dipole power supplies and detailed tracking of partially stripped foil products.

MOPME012	Single-bunch Longitudinal Phase Space Diagnostics in Multi-bunch Mode at the European XFEL	simulation, dipole, diagnostics, electron	494
	M. Yan, C. Gerth DESY, Hamburg, Germany
	Dedicated longitudinal electron beam diagnostics is highly demanded for the control and optimization of modern X-ray free-electron lasers (XFEL). At the European XFEL, 3 transverse deflecting structures (TDS) will be installed at different locations of the accelerator for measurements of slice emittance and longitudinal profile. Operation of a TDS in combined use with an energy spectrometer, e.g. a dispersive section after a single dipole magnet, allows additionally for longitudinal phase space (LPS) measurements. However, utilization of a dipole magnet is not compatible with single-bunch measurements in multi-bunch operation mode, which will be the standard operation mode of the European XFEL. In this paper, we propose a LPS diagnostic beamline consisting of a TDS, fast kicker and septum magnet for the European XFEL. The layout of the accelerator lattice with optimized optics for LPS measurements will be presented.

MOPWA013	The New Injection System of the HLS II	kicker, pulsed-power, controls, storage-ring	687
	L. Shang, Y. Lu, F. Shang, Y.Y. Wang USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: The program is funded by NSFC with No. 10875116 and No. 11175181 The 0.8GeV storege ring is being rebuilt in NSRL. The design and construction of the new injection system of the new ring is presented. Kicker magnet, septum magnet and their pulsed power suplies are described. Test results are given. The ceramic chambers, vacuum tank of the septum magnet, system timing and local pulsed power control are also described. The installation and testing of the new system undergoing.

MOPWA029	Pulse Generators for Septums and Bumps of Injection and Extraction Systems of NSLS-II Booster	injection, extraction, booster, controls	726
	D.V. Senkov, A.M. Batrakov, A.D. Chernyakin, V.A. Kiselev, A.V. Pavlenko, A.N. Zhuravlev BINP SB RAS, Novosibirsk, Russia
	Pulse generators for injection and extraction systems of NSLS-II 3 GeV booster are designed, manufactured and tested in BINP, Russia and installed and tested at BNL site. This report considers the details of bump, injection septum and extraction septum pulse generators design, their parameters and results of inspection test in BINP. The design and electronics features of control system of pulse generators are presented. Finally, the first results of injection and extraction section commissioning at BNL site are reported.

MOPWO025	Optics and Protection of the Injection and Extraction Regions of the CLIC Damping Rings	extraction, injection, kicker, damping	939
	R. Apsimon, B. Balhan, M.J. Barnes, J. Borburgh, B. Goddard, Y. Papaphilippou, J.A. Uythoven CERN, Geneva, Switzerland
	The optics design of the injection and extraction regions for the CLIC damping rings is presented. The design defines the parameters for the kicker magnets and septa in these regions and has been optimised to minimise the length of the insertions within the parameter space of the system. Failure modes of the injection and extraction elements are identified and their severity assessed. Protection elements for the injection and extraction regions are optimised based on the conclusions of the failure mode analysis.

TUPWO015	Off-Energy Injection Into Newsubaru	injection, lattice, synchrotron, betatron	1913
	Y. Shoji LASTI, Hyogo, Japan Y. Minagawa, Y. Takemura JASRI/SPring-8, Hyogo-ken, Japan
	NewSUBARU is temporarily operated in non-achromatic mode for the research using chromaticity modulation. At this special mode, a normal injection scheme does not work because of the larger stored beam size and smaller ring acceptance. In order to obtain good injection efficiency, which enables top-up operation, the injected beam energy is displaced from the ring energy. The finite dispersion of 1.1 m at the injection point and the energy displacement of 0.7% reduce the betatron oscillation amplitude of the injected beam. A trade off is a synchrotron oscillation produced by the energy mismatch. Using this technique, it became possible to inject new beam using a closed fast injection bump and also a top-up operation. Although it is not possible to inject beam to a normal achromatic lattice using a closed bump. Especially in non-achromatic quasi-isochronous ring, it would be possible that the energy mismatch is reduced by the betatron amplitude dependent shift of the equilibrium energy.

WEPWA018	Pulsed Sextupole Injection for BAPS	injection, sextupole, emittance, storage-ring	2168
	Y. Jiao, G. Xu IHEP, Beijing, People's Republic of China
	In this paper we present the physical design of the pulsed sextupole injection system for Beijing Advanced Photon Source (BAPS) with an ultralow emittance. The BAPS ring lattice is designed in such a way that two injection options are allowed, i.e., with septum and pulsed sextupole in different drift spaces or in the same drift space. For both options optimal conditions are obtained for high injection efficiency. It is found that the available efficiency in a storage ring with limited acceptance can be affected by position-dependent dispersive effect induced by the pulsed sextupoles.

WEPWA065	A Non-linear Injection Kicker for Diamond Light Source	kicker, injection, emittance, quadrupole	2268
	T. Pulampong, R. Bartolini JAI, Oxford, United Kingdom R. Bartolini Diamond, Oxfordshire, United Kingdom
	Ultra-low emittance lattices will operate with reduced dynamics apertures. New injection schemes are currently investigated in order to guarantee sufficient injection efficiency. A promising candidate is a pulsed kicker with a nonlinear magnetic field. The studies presented in this paper prove that this kicker allows injection with reduced dynamic aperture and provide minimal perturbation of the stored beam during Top-Up injection. Plans to install such a device at the Diamond light source are outlined.

WEPWA069	Design Concepts for an RF Deflecting Cavity-Based Beam Spreader for a Next Generation FEL	cavity, dipole, FEL, gun	2274
	M. Placidi, L.R. Doolittle, P. Emma, J.-Y. Jung, J. Qiang, A. Ratti, C. Sun LBNL, Berkeley, California, USA
	Funding: Work supported by the Director, Office of Science, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 The Lawrence Berkeley National Laboratory (LBNL) is developing design concepts for a multi-beamline soft x-ray FEL array powered by a superconducting linear accelerator, operating with a high bunch repetition rate of approximately one MHz. Electron bunches supplied by a high-brightness, high-repetition-rate photocathode electron gun are distributed by a beam spreader, designed to deliver individual bunches from a CW linac to an array of independently configurable FEL beamlines with nominal bunch rates up to 100 kHz in each FEL, and with even pulse spacing. We describe recent developments in the technical choices, design and parameters of the spreader system and its main components.

WEPEA016	Upgrade Study of JPARC Main Ring Fast Extraction Septa System	extraction, injection, acceleration, kicker	2531
	K. Fan, K. Ishii, H. Matsumoto, N. Matsumoto, Y. Morita KEK, Ibaraki, Japan
	The JPARC main ring fast extraction (FX) system has two functions, deliver high power beam to the neutrino experimental facility and dump the beam at any time in case of hardware failures. The present FX system consists of five pair of bipolar kickers and eight pair of bipolar septa. In order to raise the beam power to the design limit, both the beam intensity and the repetition rate will increase gradually. The FX system needs to be upgraded to satisfy the new requirements. The upgrade includes FX orbit optimization and new design of devices. Firstly, the conventional multi-turn low-field septa will be replaced by eddy current type septa. Several configurations of the new design has been studied to realize the requirements of thinner septum, higher field quality, lower leakage and higher mechanical stability. To provide sufficient flat top field for the FX beam, superposition of 3rd harmonic pulse has been employed.

WEPEA031	Slow extraction design in HIMM	extraction, synchrotron, emittance, resonance	2567
	J. Shi, W.P. Chai, J.W. Xia, J.C. Yang, Y.J. Yuan IMP, Lanzhou, People's Republic of China
	A heavy ion medical machine(HIMM) is proposed for cancer therapy in Lanzhou, China. The slow extraction design of the synchrotron is introduced in this paper. Eight sextupoles are used, four of them are for correcting the chromaticity and the rest for driving the 3rd-order resonance. In order to save the aperture of vacuum chamber, a 3-magnet bump is adopted during the extraction process. The phase space map in the entrance of the electrostatic septum and the last 3 turns' particle trajectory before particle extraction are given.

WEPEA056	Design and Beam Measurements of Modified Fast Extraction Schemes in the CERN PS for Installing a Dummy Septum to Mitigate Ring Irradiation	extraction, kicker, closed-orbit, emittance	2633
	C. Hernalsteens, H. Bartosik, L.N. Drøsdal, S.S. Gilardoni, M. Giovannozzi, A. Lachaize, Y. Papaphilippou, A. Ulsroed CERN, Geneva, Switzerland
	The proposed Multi-Turn Extraction (MTE) for the CERN PS allows to reduce the overall extraction losses for high intensity beams. The required longitudinal structure of the proton beam induces unavoidable beam losses at the magnetic extraction septum. The installation of a dummy septum with an appropriate shielding has been proposed to localise losses and to shadow the magnetic septum. Such a device, located in the extraction region, imposes tight constraints on the available beam aperture. Modified extraction schemes have been proposed and in this paper they will be presented and discussed in detail together with the measured performance.

WEPEA057	Numerical Simulations to Evaluate the Performance of CERN PS Dummy Septum to Reduce Irradiation for the Multi-Turn Extraction	extraction, shielding, kicker, beam-losses	2636
	C. Hernalsteens, S. Damjanovic, S.S. Gilardoni, M. Giovannozzi CERN, Geneva, Switzerland
	The losses created by the proposed Multi-Turn Extraction (MTE) at the CERN PS induces high activation of the magnetic extraction septum due to the de-bunched longitudinal beam structure requested to transfer the beam to the SPS. A mitigation measure is under study aiming at localizing losses in a well-shielded area by shadowing the magnetic extraction septum thanks to septum-like passive device. Such a solution is based on a so-called dummy septum, a blade which absorbs particles during the rise time of the extraction kickers for MTE beams. The efficiency of the scheme is presented in this paper. The quantitative estimate is based on detailed simulations that analyse the beam-matter interaction and provide a determination of the shadowing effect of the dummy septum.

THPEA033	Electronics for Precise Measurements of Accelerator Pulsed Magnets	extraction, injection, booster, induction	3216
	A.V. Pavlenko, A.M. Batrakov, I.V. Ilyin BINP SB RAS, Novosibirsk, Russia
	Injection and extraction systems of modern accelerator complexes have high requirements for measurements accuracy of pulsed magnets field parameters. To satisfy these demands the fast and precision digital integrators were elaborated in BINP, Russia. These devices are intended for measurements in pulsed magnets (septum magnets, bumps, etc.) with the field duration, ranging from 5 μs, providing a relative accuracy better than 5•10^-5. The set of these devices are the main measuring electronics in injection and extraction section of 3 GeV Booster Ring at NSLS-II facility, which is under construction now in BNL (USA).

THPFI002	Construction and Initial Tests of the Electrostatic Septa for MedAustron	cathode, vacuum, extraction, injection	3288
	J. Borburgh, R.A. Barlow, C. Boucly, A. Prost CERN, Geneva, Switzerland U. Dorda, T. Kramer, T. Stadlbauer EBG MedAustron, Wr. Neustadt, Austria
	For the MedAustron facility under construction in Wiener Neustadt/Austria, two electrostatic septa are built in collaboration with CERN. These septa will be used for the multi-turn injection of protons and ions, as well as for the slow extraction from the synchrotron. The power supplies are designed to combine the required precision with the capability to cycle sufficiently fast to keep up with the machine cycle. The septa are being assembled at CERN. Initial tests have been done on the remote displacement system to validate its precision and communication protocol with the MedAustron control system. Subsequently the septa are tested for vacuum performance and then HV conditioned. The construction of the septa, the requirements of the power supplies and the high voltage circuit will be described. Results of the initial laboratory tests, prior to installation in the accelerator, will be given.

THPME033	Pulsed Magnets for Injection and Extraction Sections of NSLS-II 3 GeV Booster	vacuum, injection, extraction, booster	3582
	A.N. Zhuravlev, A.M. Batrakov, A.D. Chernyakin, V.A. Kiselev, V.M. Konstantinov, A.V. Pavlenko, V.V. Petrov, E.P. Semenov, D.V. Senkov BINP SB RAS, Novosibirsk, Russia
	Magnets for injection and extraction sections of NSLS-II 3 GeV booster are designed, manufactured and tested in BINP, Russia. This report considers the details of bump and septum magnets design, their parameters and results of inspection test in BINP. The design and electronics features of the measurement stand for these magnets are presented. Also, capabilities of specialized power supplies are listed and discussed. Finally, the first results of injection and extraction sections commissioning at BNL site are reported.

THPWO032	Progress of Injection Energy Upgrade Project for J-PARC RCS	injection, power-supply, impedance, linac	3833
	N. Hayashi, H. Harada, K. Horino, H. Hotchi, J. Kamiya, M. Kinsho, P.K. Saha, Y. Shobuda, T. Takayanagi, N. Tani, T. Togashi, T. Ueno, M. Watanabe, Y. Watanabe, K. Yamamoto, M. Yamamoto, Y. Yamazaki, M. Yoshimoto JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan Y. Irie KEK, Ibaraki, Japan T. Toyama J-PARC, KEK & JAEA, Ibaraki-ken, Japan
	The injection energy of the J-PARC RCS will be upgraded in 2013. New power supplies for the shift bump magnet system will be installed. Some of other systems, upgrade of the painting bump power supplies and pulse steering systems, are already installed and tested or used for the nominal operation. The paper reports the progress of injection energy upgrade project.

Paper

Title

Other Keywords

Page

MOPEA012

Lifetime Studies at Metrology Light Source and ANKA

cavity, optics, electron, scattering

88

T. Goetsch, J. Feikes, M. Ries, G. Wüstefeld
HZB, Berlin, Germany
A.-S. Müller
KIT, Karlsruhe, Germany

The Metrology Light Source (MLS)*, situated in Berlin (Germany) is an electron storage ring operating from 10⁵ MeV to 630 MeV and is serving as the national primary radiation source standard from the near infrared to the vacuum ultraviolet spectral region. In its standard user mode, the lifetime is dominated by the Touschek effect. Measurements and analysis of the Touschek lifetime as a function of beam current and RF-Voltage will be presented and compared to measurements done at the ANKA electron storage ring (Karlsruhe, Germany) which operates at 0.5 to 2.5 GeV**.
* R. Klein et al., Phys. Rev. ST-AB 11, 110701 (2008)
** A.-S. Müller et al., Energy Calibration Of The ANKA Storage Ring, In Proceedings of EPAC 2004

MOPEA053

Status of NSLS-II Booster

booster, dipole, controls, vacuum

196

S.M. Gurov, A.I. Erokhin, S.E. Karnaev, V.A. Kiselev, E.B. Levichev, A. Polyansky, A.M. Semenov, S.V. Shiyankov, S.V. Sinyatkin, V.V. Smaluk
BINP SB RAS, Novosibirsk, Russia
H.-C. Hseuh, T.V. Shaftan
BNL, Upton, Long Island, New York, USA

The National Synchrotron Light Source II is a third generation light source under construction at Brookhaven National Laboratory. The project includes a highly optimized 3 GeV electron storage ring, linac pre-injector and full-energy injector-synchrotron. Budker Institute of Nuclear Physics build booster for NSLS-II. The booster should accelerate the electron beam continuously and reliably from a minimum 170 MeV injection energy to a maximum energy of 3.15 GeV and average beam current of 20 mA. The booster shall be capable of multi-bunch and single bunch operation. Pre-comissioning test results of booster components and system are reviewed.

MOPFI007

SIS-18 RF Knock-Out Optimization Studies

extraction, resonance, dipole, synchrotron

297

M.M. Kirk, D. Ondreka, P.J. Spiller
GSI, Darmstadt, Germany

The extraction efficiency and spill temporal-structure of the SIS-18 heavy ion synchrotron are part of the upgrades to the GSI accelerator complex. Losses to the extraction septum can be minimised through implementation of the Hardt condition resulting however in a poorer quality of the spill microstructure at resolutions of a few microseconds due to lowering of the horizontal chromaticity from its 'natural' value. Ways to improve the extraction efficiency and spill microstructure are investigated with a tracking code. One possibility for improvement may be to use an alternative RF modulation applied to the knock-out exciter.

MOPFI050

Non-local Fast Extraction from the CERN SPS at 100 and 440 GeV

extraction, kicker, simulation, injection

392

F.M. Velotti, A. Alekou, W. Bartmann, E. Carlier, K. Cornelis, I. Efthymiopoulos, B. Goddard, L.K. Jensen, V. Kain, M. Kowalska, V. Mertens, R. Steerenberg
CERN, Geneva, Switzerland

The Long Straight Section 2 (LSS2) of the CERN SPS is connected with the North Area (NA), to which the beam to date has always been extracted using a resonant extraction technique. For new proposed short- and long-baseline neutrino experiments, a fast single turn extraction to this experimental area is required. As there are no kickers in LSS2, and the integration of any new kickers with the existing electrostatic septum would be problematic, a solution has been developed to fast extract the beam using non-local extraction with other SPS kickers. Two different kicker systems have been used, the injection kicker in LSS1 and the stronger extraction kicker in LSS6 to extract 100 and 440 GeV beam, respectively. For both solutions a large emittance beam was extracted after 5 or 9 full betatron periods. The concept and simulation details are presented with the analysis of the aperture and beam loss considerations and experimental results collected during a series of beam tests.

MOPFI051

Beam Transfer Systems for the LAGUNA-LBNO Long Baseline Neutrino Beam from the CERN SPS

extraction, kicker, injection, target

395

B. Goddard, W. Bartmann, I. Efthymiopoulos, Y. Papaphilippou, A.S. Parfenova
CERN, Geneva, Switzerland

For the Long Baseline neutrino facility under study at CERN (LAGUNA-LBNO) it is initially planned to extract a 400 GeV beam from the second long straight section in the SPS into the existing transfer channel TT20 leading to the North Area experimental zone, to a new target aligned with a far detector in Finland. In a second phase a new High-Power Proton Synchrotron (HPPS) accelerator is proposed, to give a 2 MW beam at about 50 GeV on the same target. In this paper the beam transfer systems required for the project are outlined, including the new sections of transfer line between the SPL, HPPS and SPS, and from the SPS to the target, and also the injection and extraction systems in the long straight section of the HPPS. The feasibility of a 4 GeV H⁻ injection system is discussed.

MOPFI052

A New Lead Ion Injection System for the CERN SPS with 50 ns Rise Time

injection, kicker, ion, impedance

398

B. Goddard, O. Aberle, J. Borburgh, E. Carlier, K. Cornelis, L. Ducimetière, L.K. Jensen, T. Kramer, D. Manglunki, A. Mereghetti, V. Mertens, D. Nisbet, B. Salvant, L. Sermeus
CERN, Geneva, Switzerland

The LHC High Luminosity upgrade project includes a performance upgrade for heavy ions. One of the present performance limitations is the rise time of the SPS injection kicker system, which imposes a spacing of at least 220 ns between injected bunch trains at the operational rigidity. A reduction of this rise time to 50 ns for lead ions is requested as part of the suite of measures needed to increase the present design performance by a factor three. A new injection system based on a fast pulsed septum and a fast kicker has been proposed to fulfil this rise time requirement, and to meet all the constraints associated with the existing high intensity proton injection in the same region. This paper describes the concept and the required equipment parameters, and explores the implications of such a system for SPS operation.

MOPFI061

Concept for Elena Extraction and Beam Transfer Elements

extraction, kicker, quadrupole, vacuum

422

J. Borburgh, B. Balhan, W. Bartmann, T. Fowler, L. Sermeus, G. Vanbavinckhove
CERN, Geneva, Switzerland
R.A. Baartman
TRIUMF, Vancouver, Canada
D. Barna
University of Tokyo, Tokyo, Japan
V. Pricop
Transilvania University of Brasov, Brasov, Romania

In 2011 the ELENA decelerator was approved as a CERN project. Initially one extraction was foreseen, which should use a kicker and a magnetic septum which can be recuperated from an earlier installation. Since then a second extraction has been approved and a new solution was studied using only electric fields to extract the beam. This will be achieved by fast pulsing a separator, allowing single-bunch but also a full single-turn extraction from ELENA towards the experiments. The extraction and transfer requirements of ELENA are described, followed by the principal differences between the magnetic and electric field concepts. The design of electrostatic focussing and bending devices for the transfer lines will be presented. Finally the field quality which can be achieved with the separator and the concept of its power supply will be discussed.

MOPFI063

Progress on Designs for 180 MeV Injection into the ISIS Synchrotron

injection, dipole, synchrotron, stripper

428

B. Jones, D.J. Adams, B.S. Drumm, M.C. Hughes, A.J. McFarland, C.M. Warsop
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

The ISIS Facility at the Rutherford Appleton Laboratory in the UK produces intense neutron and muon beams for condensed matter research. It operates at 50Hz accelerating beam via a 70 MeV H⁻ linac and an 800 MeV proton synchrotron, delivering a mean beam power of 0.2 MW. As an initial step towards megawatt operations at ISIS, a study of replacement of the existing injector with a new 180 MeV H⁻ linac has recently been completed. This could enable an increase in beam power to approximately 0.5 MW. The ISIS Facility at the Rutherford Appleton Laboratory in the UK produces intense neutron and muon beams for condensed matter research. It accelerates 3×10¹³ protons per pulse (ppp) at 50 Hz through a 70 MeV H− linac and an 800 MeV proton synchrotron, delivering a mean beam power of ~0.2 MW. A favoured first step to upgrade ISIS towards the megawatt regime is replacement of the linac with a new 180 MeV injector described in [1]. Studies of this upgrade, which aims to increase mean beam power up to 0.5 MW are outlined in [2]. This paper reports on recent development of the designs including the injection septum, dipole power supplies and detailed tracking of partially stripped foil products.

MOPME012

Single-bunch Longitudinal Phase Space Diagnostics in Multi-bunch Mode at the European XFEL

simulation, dipole, diagnostics, electron

494

M. Yan, C. Gerth
DESY, Hamburg, Germany

Dedicated longitudinal electron beam diagnostics is highly demanded for the control and optimization of modern X-ray free-electron lasers (XFEL). At the European XFEL, 3 transverse deflecting structures (TDS) will be installed at different locations of the accelerator for measurements of slice emittance and longitudinal profile. Operation of a TDS in combined use with an energy spectrometer, e.g. a dispersive section after a single dipole magnet, allows additionally for longitudinal phase space (LPS) measurements. However, utilization of a dipole magnet is not compatible with single-bunch measurements in multi-bunch operation mode, which will be the standard operation mode of the European XFEL. In this paper, we propose a LPS diagnostic beamline consisting of a TDS, fast kicker and septum magnet for the European XFEL. The layout of the accelerator lattice with optimized optics for LPS measurements will be presented.

MOPWA013

The New Injection System of the HLS II

kicker, pulsed-power, controls, storage-ring

687

L. Shang, Y. Lu, F. Shang, Y.Y. Wang
USTC/NSRL, Hefei, Anhui, People's Republic of China

Funding: The program is funded by NSFC with No. 10875116 and No. 11175181
The 0.8GeV storege ring is being rebuilt in NSRL. The design and construction of the new injection system of the new ring is presented. Kicker magnet, septum magnet and their pulsed power suplies are described. Test results are given. The ceramic chambers, vacuum tank of the septum magnet, system timing and local pulsed power control are also described. The installation and testing of the new system undergoing.

MOPWA029

Pulse Generators for Septums and Bumps of Injection and Extraction Systems of NSLS-II Booster

injection, extraction, booster, controls

726

D.V. Senkov, A.M. Batrakov, A.D. Chernyakin, V.A. Kiselev, A.V. Pavlenko, A.N. Zhuravlev
BINP SB RAS, Novosibirsk, Russia

Pulse generators for injection and extraction systems of NSLS-II 3 GeV booster are designed, manufactured and tested in BINP, Russia and installed and tested at BNL site. This report considers the details of bump, injection septum and extraction septum pulse generators design, their parameters and results of inspection test in BINP. The design and electronics features of control system of pulse generators are presented. Finally, the first results of injection and extraction section commissioning at BNL site are reported.

MOPWO025

Optics and Protection of the Injection and Extraction Regions of the CLIC Damping Rings

extraction, injection, kicker, damping

939

R. Apsimon, B. Balhan, M.J. Barnes, J. Borburgh, B. Goddard, Y. Papaphilippou, J.A. Uythoven
CERN, Geneva, Switzerland

The optics design of the injection and extraction regions for the CLIC damping rings is presented. The design defines the parameters for the kicker magnets and septa in these regions and has been optimised to minimise the length of the insertions within the parameter space of the system. Failure modes of the injection and extraction elements are identified and their severity assessed. Protection elements for the injection and extraction regions are optimised based on the conclusions of the failure mode analysis.

TUPWO015

Off-Energy Injection Into Newsubaru

injection, lattice, synchrotron, betatron

1913

Y. Shoji
LASTI, Hyogo, Japan
Y. Minagawa, Y. Takemura
JASRI/SPring-8, Hyogo-ken, Japan

NewSUBARU is temporarily operated in non-achromatic mode for the research using chromaticity modulation. At this special mode, a normal injection scheme does not work because of the larger stored beam size and smaller ring acceptance. In order to obtain good injection efficiency, which enables top-up operation, the injected beam energy is displaced from the ring energy. The finite dispersion of 1.1 m at the injection point and the energy displacement of 0.7% reduce the betatron oscillation amplitude of the injected beam. A trade off is a synchrotron oscillation produced by the energy mismatch. Using this technique, it became possible to inject new beam using a closed fast injection bump and also a top-up operation. Although it is not possible to inject beam to a normal achromatic lattice using a closed bump. Especially in non-achromatic quasi-isochronous ring, it would be possible that the energy mismatch is reduced by the betatron amplitude dependent shift of the equilibrium energy.

WEPWA018

Pulsed Sextupole Injection for BAPS

injection, sextupole, emittance, storage-ring

2168

Y. Jiao, G. Xu
IHEP, Beijing, People's Republic of China

In this paper we present the physical design of the pulsed sextupole injection system for Beijing Advanced Photon Source (BAPS) with an ultralow emittance. The BAPS ring lattice is designed in such a way that two injection options are allowed, i.e., with septum and pulsed sextupole in different drift spaces or in the same drift space. For both options optimal conditions are obtained for high injection efficiency. It is found that the available efficiency in a storage ring with limited acceptance can be affected by position-dependent dispersive effect induced by the pulsed sextupoles.

WEPWA065

A Non-linear Injection Kicker for Diamond Light Source

kicker, injection, emittance, quadrupole

2268

T. Pulampong, R. Bartolini
JAI, Oxford, United Kingdom
R. Bartolini
Diamond, Oxfordshire, United Kingdom

Ultra-low emittance lattices will operate with reduced dynamics apertures. New injection schemes are currently investigated in order to guarantee sufficient injection efficiency. A promising candidate is a pulsed kicker with a nonlinear magnetic field. The studies presented in this paper prove that this kicker allows injection with reduced dynamic aperture and provide minimal perturbation of the stored beam during Top-Up injection. Plans to install such a device at the Diamond light source are outlined.

WEPWA069

Design Concepts for an RF Deflecting Cavity-Based Beam Spreader for a Next Generation FEL

cavity, dipole, FEL, gun

2274

M. Placidi, L.R. Doolittle, P. Emma, J.-Y. Jung, J. Qiang, A. Ratti, C. Sun
LBNL, Berkeley, California, USA

Funding: Work supported by the Director, Office of Science, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231
The Lawrence Berkeley National Laboratory (LBNL) is developing design concepts for a multi-beamline soft x-ray FEL array powered by a superconducting linear accelerator, operating with a high bunch repetition rate of approximately one MHz. Electron bunches supplied by a high-brightness, high-repetition-rate photocathode electron gun are distributed by a beam spreader, designed to deliver individual bunches from a CW linac to an array of independently configurable FEL beamlines with nominal bunch rates up to 100 kHz in each FEL, and with even pulse spacing. We describe recent developments in the technical choices, design and parameters of the spreader system and its main components.

WEPEA016

Upgrade Study of JPARC Main Ring Fast Extraction Septa System

extraction, injection, acceleration, kicker

2531

K. Fan, K. Ishii, H. Matsumoto, N. Matsumoto, Y. Morita
KEK, Ibaraki, Japan

The JPARC main ring fast extraction (FX) system has two functions, deliver high power beam to the neutrino experimental facility and dump the beam at any time in case of hardware failures. The present FX system consists of five pair of bipolar kickers and eight pair of bipolar septa. In order to raise the beam power to the design limit, both the beam intensity and the repetition rate will increase gradually. The FX system needs to be upgraded to satisfy the new requirements. The upgrade includes FX orbit optimization and new design of devices. Firstly, the conventional multi-turn low-field septa will be replaced by eddy current type septa. Several configurations of the new design has been studied to realize the requirements of thinner septum, higher field quality, lower leakage and higher mechanical stability. To provide sufficient flat top field for the FX beam, superposition of 3rd harmonic pulse has been employed.

WEPEA031

Slow extraction design in HIMM

extraction, synchrotron, emittance, resonance

2567

J. Shi, W.P. Chai, J.W. Xia, J.C. Yang, Y.J. Yuan
IMP, Lanzhou, People's Republic of China

A heavy ion medical machine(HIMM) is proposed for cancer therapy in Lanzhou, China. The slow extraction design of the synchrotron is introduced in this paper. Eight sextupoles are used, four of them are for correcting the chromaticity and the rest for driving the 3rd-order resonance. In order to save the aperture of vacuum chamber, a 3-magnet bump is adopted during the extraction process. The phase space map in the entrance of the electrostatic septum and the last 3 turns' particle trajectory before particle extraction are given.

WEPEA056

Design and Beam Measurements of Modified Fast Extraction Schemes in the CERN PS for Installing a Dummy Septum to Mitigate Ring Irradiation

extraction, kicker, closed-orbit, emittance

2633

C. Hernalsteens, H. Bartosik, L.N. Drøsdal, S.S. Gilardoni, M. Giovannozzi, A. Lachaize, Y. Papaphilippou, A. Ulsroed
CERN, Geneva, Switzerland

The proposed Multi-Turn Extraction (MTE) for the CERN PS allows to reduce the overall extraction losses for high intensity beams. The required longitudinal structure of the proton beam induces unavoidable beam losses at the magnetic extraction septum. The installation of a dummy septum with an appropriate shielding has been proposed to localise losses and to shadow the magnetic septum. Such a device, located in the extraction region, imposes tight constraints on the available beam aperture. Modified extraction schemes have been proposed and in this paper they will be presented and discussed in detail together with the measured performance.

WEPEA057

Numerical Simulations to Evaluate the Performance of CERN PS Dummy Septum to Reduce Irradiation for the Multi-Turn Extraction

extraction, shielding, kicker, beam-losses

2636

C. Hernalsteens, S. Damjanovic, S.S. Gilardoni, M. Giovannozzi
CERN, Geneva, Switzerland

The losses created by the proposed Multi-Turn Extraction (MTE) at the CERN PS induces high activation of the magnetic extraction septum due to the de-bunched longitudinal beam structure requested to transfer the beam to the SPS. A mitigation measure is under study aiming at localizing losses in a well-shielded area by shadowing the magnetic extraction septum thanks to septum-like passive device. Such a solution is based on a so-called dummy septum, a blade which absorbs particles during the rise time of the extraction kickers for MTE beams. The efficiency of the scheme is presented in this paper. The quantitative estimate is based on detailed simulations that analyse the beam-matter interaction and provide a determination of the shadowing effect of the dummy septum.

THPEA033

Electronics for Precise Measurements of Accelerator Pulsed Magnets

extraction, injection, booster, induction

3216

A.V. Pavlenko, A.M. Batrakov, I.V. Ilyin
BINP SB RAS, Novosibirsk, Russia

Injection and extraction systems of modern accelerator complexes have high requirements for measurements accuracy of pulsed magnets field parameters. To satisfy these demands the fast and precision digital integrators were elaborated in BINP, Russia. These devices are intended for measurements in pulsed magnets (septum magnets, bumps, etc.) with the field duration, ranging from 5 μs, providing a relative accuracy better than 5•10^-5. The set of these devices are the main measuring electronics in injection and extraction section of 3 GeV Booster Ring at NSLS-II facility, which is under construction now in BNL (USA).

THPFI002

Construction and Initial Tests of the Electrostatic Septa for MedAustron

cathode, vacuum, extraction, injection

3288

J. Borburgh, R.A. Barlow, C. Boucly, A. Prost
CERN, Geneva, Switzerland
U. Dorda, T. Kramer, T. Stadlbauer
EBG MedAustron, Wr. Neustadt, Austria

For the MedAustron facility under construction in Wiener Neustadt/Austria, two electrostatic septa are built in collaboration with CERN. These septa will be used for the multi-turn injection of protons and ions, as well as for the slow extraction from the synchrotron. The power supplies are designed to combine the required precision with the capability to cycle sufficiently fast to keep up with the machine cycle. The septa are being assembled at CERN. Initial tests have been done on the remote displacement system to validate its precision and communication protocol with the MedAustron control system. Subsequently the septa are tested for vacuum performance and then HV conditioned. The construction of the septa, the requirements of the power supplies and the high voltage circuit will be described. Results of the initial laboratory tests, prior to installation in the accelerator, will be given.

THPME033

Pulsed Magnets for Injection and Extraction Sections of NSLS-II 3 GeV Booster

vacuum, injection, extraction, booster

3582

A.N. Zhuravlev, A.M. Batrakov, A.D. Chernyakin, V.A. Kiselev, V.M. Konstantinov, A.V. Pavlenko, V.V. Petrov, E.P. Semenov, D.V. Senkov
BINP SB RAS, Novosibirsk, Russia

Magnets for injection and extraction sections of NSLS-II 3 GeV booster are designed, manufactured and tested in BINP, Russia. This report considers the details of bump and septum magnets design, their parameters and results of inspection test in BINP. The design and electronics features of the measurement stand for these magnets are presented. Also, capabilities of specialized power supplies are listed and discussed. Finally, the first results of injection and extraction sections commissioning at BNL site are reported.

THPWO032

Progress of Injection Energy Upgrade Project for J-PARC RCS

injection, power-supply, impedance, linac

3833

N. Hayashi, H. Harada, K. Horino, H. Hotchi, J. Kamiya, M. Kinsho, P.K. Saha, Y. Shobuda, T. Takayanagi, N. Tani, T. Togashi, T. Ueno, M. Watanabe, Y. Watanabe, K. Yamamoto, M. Yamamoto, Y. Yamazaki, M. Yoshimoto
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
Y. Irie
KEK, Ibaraki, Japan
T. Toyama
J-PARC, KEK & JAEA, Ibaraki-ken, Japan

The injection energy of the J-PARC RCS will be upgraded in 2013. New power supplies for the shift bump magnet system will be installed. Some of other systems, upgrade of the painting bump power supplies and pulse steering systems, are already installed and tested or used for the nominal operation. The paper reports the progress of injection energy upgrade project.