IPAC2016 - List of Keywords (septum)

Paper	Title	Other Keywords	Page
MOPOW055	Injection Using a Non-linear Kicker Located in the Existing Injection Straight at Diamond Storage Ring	injection, kicker, storage-ring, optics	840
	B. Singh, M. Apollonio, R. Bartolini, I.P.S. Martin DLS, Oxfordshire, United Kingdom A. Alekou, R. Bartolini, T. Pulampong JAI, Oxford, United Kingdom
	Injection studies using a non-linear kicker for the Diamond storage ring have been carried out previously. These studies have been recently extended to investigate whether the non-linear kicker can be located in the injection straight downstream of the septum and outside the existing dipole kicker bump. If so, injection with a non-linear kicker becomes independent of the optics used, making it suitable for use in both standard and low alpha mode. With this configuration, the existing injection scheme could also be left in place, leaving open the possibility to study both schemes in situ before potentially removing the existing dipole kickers at a later date. In order to operate with the non-linear kicker, the injected beam needs to exit the transfer line at an angle of 3mrad; this has been successfully demonstrated during machine development time. The concept and feasibility studies of this scheme are presented in this paper. T. Pulampong, et al., Proc. IPAC 2013, Shanghai, WEPWA065, (2013)
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOW055
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TUOBA01	Beam Commissioning of SuperKEKB	optics, coupling, vacuum, detector	1019
	Y. Funakoshi, T. Abe, T. Adachi, K. Akai, Y. Arimoto, K. Egawa, Y. Enomoto, J.W. Flanagan, H. Fukuma, K. Furukawa, N. Iida, H. Iinuma, H. Ikeda, T. Ishibashi, M. Iwasaki, T. Kageyama, H. Kaji, T. Kamitani, T. Kawamoto, S. Kazama, M. Kikuchi, T. Kobayashi, K. Kodama, H. Koiso, M. Masuzawa, T. Mimashi, T. Miura, F. Miyahara, T. Mori, A. Morita, S. Nakamura, T.T. Nakamura, H. Nakayama, T. Natsui, M. Nishiwaki, K. Ohmi, Y. Ohnishi, T. Oki, S. Sasaki, M. Satoh, Y. Seimiya, K. Shibata, M. Suetake, Y. Suetsugu, H. Sugimoto, M. Tanaka, M. Tawada, S. Terui, M. Tobiyama, S. Uehara, S. Uno, X. Wang, K. Watanabe, Y. Yano, S.I. Yoshimoto, R. Zhang, D. Zhou, X. Zhou, Z.G. Zong KEK, Ibaraki, Japan D. El Khechen LAL, Orsay, France
	In this report, we describe the machine operation in the first 3 months of the Phase 1 commissioning of SuperKEKB. The beam commissioning is smoothly going on. Vacuum scrubbing, the optics corrections and others are described.
	Slides TUOBA01 [9.346 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUOBA01
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TUPMB017	The Injection Septum Magnet for the Collector Ring (FAIR)	injection, vacuum, operation, lattice	1145
	P.Yu. Shatunov, D.E. Berkaev, I. Koop, E.P. Semenov, D.B. Shwartz BINP SB RAS, Novosibirsk, Russia A. Dolinskyy, S.A. Litvinov GSI, Darmstadt, Germany Yu. A. Rogovsky Budker INP & NSU, Novosibirsk, Russia
	Collector Ring is one of the key installations of the FAIR project (Darmstadt, Germany). It is dedicated for stochastic cooling of incoming beams of antiprotons and rare ions. Additionally there is a mode of operation for experiments in the ring. Beams for all modes of operation are injected through one transfer channel. Extremely high acceptance of the ring (240 mm*mrad) leads to large apertures of all magnetic elements including the septum magnet. Meanwhile planned parameters of the magnetic field and magnetic field quality are comparatively strict. The present state of the design of the pulsed injection septum for the CR is presented in this article together with the concept of the injection system.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB017
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TUPMR039	The Development of a New High Field Injection Septum Magnet System for Main Ring of J-Parc	injection, operation, power-supply, flattop	1337
	T. Shibata, K. Ishii, H. Matsumoto, N. Matsumoto, T. Sugimoto KEK, Ibaraki, Japan K. Fan HUST, Wuhan, People's Republic of China
	We are improving the Main Ring (MR) for beam power of 750 kw which is the first goal of J-PARC. The repetition period of the fast extraction must be short to 1.3 second from the current period of 2.48 second for the improvement of the beam power. It is necessary to exchange a high field injection septum magnet which will be installed at the injection line from RCS to MR and its power supply, because the current injection septum system can not be operated with 1.3 second repetition. Since confirmed the large leakage field around current circling beam line of the injection magnet, we must improve the shielding structure which make low leakage field. We started the development of the new injection septum magnet and its power supply in 2013. It can operate with 1 Hz repetition and the low leakage field which its order is 10^-4 of the gap field. The new Injection septum magnet and the new power supply were constructed in Winter of 2014. We had many improvement of the magnet and power supply. We will install the new injection septum magnet system in this summer. In this presentation, we will report the detail of the results of its performance.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR039
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TUPMR040	The Development of a New Low Field Septum Magnet System for Fast Extraction in Main Ring of J-PARC	operation, power-supply, vacuum, extraction	1340
	T. Shibata, K. Ishii, H. Matsumoto, N. Matsumoto, T. Sugimoto KEK, Ibaraki, Japan K. Fan HUST, Wuhan, People's Republic of China
	The J-PARC Main Ring (MR) is being upgraded to improve its beam power to the design goal of 750 kW. One important way is to reduce the repetition period from 2.48 s to 1.3 s so that the beam power can be nearly doubled. We need to improve the septum magnets for fast extraction. We are improving the magnets and their power supplies. The present magnets which is conventional type have problem in durability of septum coil by its vibration, and large leakage field. The new magnets are eddy current type. The eddy current type does not have septum coil, but has a thin plate. We expect that there is no problem in durability, we can construct the thin septum plate, the leakage field can be reduced. The output of the present power supply are pattern current which of flat top is 10 ms width, the new one is short pulse which of one is 10 us. The short pulse consists of 1st and 3rd higher harmonic. We can expect that the flatness and reproducibility of flat top current can be improved. The calorific power can be also reduced. This paper will report the field measurement results with the eddy septum magnet systems.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR040
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TUPMR047	Conceptual Design Considerations for the 50 TeV FCC Beam Dump Insertion	extraction, kicker, collimation, optics	1356
	F. Burkart, M.G. Atanasov, W. Bartmann, B. Goddard, T. Kramer, A. Lechner, A. Sanz Ull, D. Schulte, L.S. Stoel CERN, Geneva, Switzerland D. Barna University of Tokyo, Tokyo, Japan
	Safely extracting and absorbing the 50 TeV proton beams of the FCC-hh collider will be a major challenge. Two extended straight sections (ESS) are dedicated to beam dumping system and collimation. The beam dumping system will fast-extract the beam and transport it to an external absorber, while the collimation system will protect the superconducting accelerator components installed further downstream. The high stored beam energy of about 8.5 GJ per beam means that machine protection considerations will severely constrain the functional design of the ESS and the beam dump line geometry, in addition to dominating the performance specifications of the main sub-systems like kickers and absorber blocks. The general features, including concept choice, optics in the ESS and beam dump line, passive protection devices, layout and integration are described and discussed.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR047
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WEPMR056	Septum Magnet using a Superconducting Shield	shielding, extraction, radiation, dipole	2402
	D. Barna University of Tokyo, Tokyo, Japan F. Burkart CERN, Geneva, Switzerland
	A field-free region can be created within a dipole magnet using a superconducting shield, which maintains persistent eddy currents induced during the ramp-up of the magnet. We will study the possibility to realize a high-field superconducting septum magnet using this principle. Properties of different configurations will be presented, and compared to the requirements of the FCC dump system.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR056
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WEPMW011	Stable Spin Direction Investigations in RHIC	kicker, extraction, emittance, injection	2442
	F. Méot, H. Huang, N. Tsoupas 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. Beam and spin dynamics investigations are part of the preparations and studies regarding RHIC collider runs, they are part as well of the efforts dedicated to improving stored beam polarization, and in view of the eRHIC EIC project. Some recent studies and their outcomes are discussed.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMW011
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WEPOW024	Commissioning of SESAME Booster	booster, injection, quadrupole, extraction	2880
	M. Attal, I.A. Abid, T.H. Abu-Hanieh, H. Al-Mohammad, M.A. Al-Najdawi, D.S. Foudeh, A. Hamad, E. Huttel, A. Ismail, S.Kh. Jafar, F. Makahleh, M. Mansouri Sharifabad, K. Manukyan, I. Saleh, N.Kh. Sawai, M.M. Shehab SESAME, Allan, Jordan
	Commissioning of the 800 MeV booster of SESAME light source started in December 2013. The 38.4 m circumference booster is a part of SESAME injector which includes also a 20 MeV classical microtron as a pre-injector that is in operation since 2012. The main results and experience obtained during the commissioning period are reported in this paper.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW024
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THPMR016	Horizontal Phase Space Shaping for Optimized Off-axis Injection Efficiency	injection, sextupole, optics, lattice	3424
	S.M. White, S. Lagarde, S.M. Liuzzo, B. Ogier, T.P. Perron, P. Raimondi ESRF, Grenoble, France
	With the introduction of top-up operation at the ESRF it becomes important to reduce as much as possible any kind of perturbation seen by the users during injection. For this purpose, a novel technique to improve injection efficiency by shaping the horizontal beam phase space to better match the storage ring acceptance and hence reduce the duration of injections was developed. Theoretical concept, simulations and first experimental results are presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR016
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THPMR043	Performance of Transverse Beam Splitting and Extraction at the CERN Proton Synchrotron in the Framework of Multi-turn Extraction	extraction, proton, resonance, sextupole	3492
	G. Sterbini, J.C.C.M. Borburgh, S. Damjanovic, S.S. Gilardoni, M. Giovannozzi, C. Hernalsteens, M. Hourican, A. Huschauer, K. Kahle, G. Le Godec, O. Michels CERN, Geneva, Switzerland C. Hernalsteens EPFL, Lausanne, Switzerland
	Considerable progress has been made in 2015 in the setting up of the multi-turn extraction (MTE) in the CERN Proton Synchrotron (PS). A key ingredient in this novel extraction technique is the beam splitting in transverse phase space. This manipulation is based on adiabatic trapping in stable islands of transverse phase space and requires mastering a number of devices in the PS ring. In addition, an in-depth review of all fast extractions schemes in the PS had been required due to the development and installation of a dummy septum to shield the actual magnetic septum. In this paper, the current performance of the beam splitting and of the extraction including the shadowing effect is presented. Future lines of development will also be discussed.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR043
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THPOR048	Beam Losses at CERNs PS and SPS Measured with Diamond Particle Detectors	extraction, detector, injection, kicker	3898
	F. Burkart, W. Bartmann, B. Dehning, E. Effinger, M.A. Fraser, B. Goddard, V. Kain, O. Stein CERN, Geneva, Switzerland E. Griesmayer CIVIDEC Instrumentation, Wien, Austria O. Stein University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany
	Diamond particle detectors have been used in the LHC to measure fast particle losses with a nanosecond time resolution. In addition, these detectors were installed in the PS and the SPS. The detectors are mounted close to the extraction septum of the PS (transfer line to SPS) and the SPS (transfer lines TI2 and TI8 to LHC). Mainly, they monitor the losses occurring during the extraction process but the detectors are also able to measure turn-by-turn losses in the accelerators. In addition, detailed studies concerning losses due to ghost bunches were performed. This paper will describe the installed diamond detector setup, discuss the measurement results and possible loss mitigations.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR048
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THPOW032	Experimental Test on the TPS Booster Injection Scheme Exploration and the Associated Bunch Train Analysis	injection, booster, kicker, operation	4008
	H.-P. Chang, C.L. Chen, C.-S. Fann, K.T. Hsu, S.Y. Hsu, K.-K. Lin, K.L. Tsai NSRRC, Hsinchu, Taiwan
	In order to explore the tuning range of injection septum and kicker for TPS booster operation, an experimental test on the designed injection scheme has been performed. Tuning of these injection units is based on the top-up operation process for storage ring vacuum cleaning purpose. It is set for a fast beam accumulation in the storage ring where the stored beam variation range is selected for efficient operation consideration. The measurement results of booster beam current variation while tuning of injection septum and kicker are presented. A preliminary analysis concerning the observation of deteriorated phase space acceptance in the TPS booster is given in this report. This study also includes an effort to extend the present available operation bunch train for TPS booster. It shows that the increase of the booster beam current by bunch train tuning indicates an upper bound of about 400 ns.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW032
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THPOW034	TLS Booster Injection Scheme Exploration	booster, injection, kicker, electron	4016
	H.H. Chen, H.-P. Chang, H.C. Chen, S.J. Huang, C.H. Kuo, A.P. Lee, J.A. Li, K.-K. Lin, Y.K. Lin NSRRC, Hsinchu, Taiwan
	In this paper, the booster injection efficiency and the parameter working range related to key components in-cluding septum magnet and kicker magnet for Taiwan Light Source (TLS) injector operation are introduced. Booster injection scheme for different lattice is explored by machine study plan using injector property. The study result may be used by the operator as booster injection parameter fine tuning reference. It is also helpful for the advanced injection scheme exploration.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW034
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THPOW050	Upgrade of Septum Magnets of the Transfer Line in TPS	injection, power-supply, simulation, booster	4057
	C.S. Yang, C.-H. Chang, Y.L. Chu, J.C. Huang, C.-S. Hwang, J.C. Jan, F.-Y. Lin NSRRC, Hsinchu, Taiwan
	Taiwan Photon Source (TPS) is a 3-GeV light source. The full current of the storage beam and commissioning of insertion devices are still in progress. An improved injection between the booster ring (BR) and the storage ring (SR) was implemented to increase the efficiency of injection and the reliability of the electrical parts. A DC septum (length 0.8 m) was replaced with an AC septum (length 1 m, type C) to decrease the leakage field and to relax the loading of the power supply. Mapping the field with mu-metal shielding was also implemented to diminish the leakage field from the AC septum. The lattice of the transfer line between the booster ring and the storage ring, BTS, was also rearranged to meet the new injection requirements. The performance of the AC septum with mu-metal shielding and the upgrade of the BTS lattice are discussed in this paper.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW050
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THPOY033	SIS100 Availability and Machine Protection	ion, dipole, proton, extraction	4171
	C. Omet, H. Kisker, M.S. Mandakovic, D. Ondreka, P.J. Spiller, R.J. Steinhagen GSI, Darmstadt, Germany
	For the future FAIR driver accelerator, SIS100, a detailed System-FMEA (Failure Modes and Effects Analysis) according to IEC 61508 has been done. One the one hand, this has been done to identify possible shortcomings for machine protection and on the other hand to predict the machine's availabilty for beam on target. The methodology for the analysis and the main failure modes currently known for the machine and its environment are described in detail. An estimate of the total machine's availability is given.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY033
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Paper

Title

Other Keywords

Page

MOPOW055

Injection Using a Non-linear Kicker Located in the Existing Injection Straight at Diamond Storage Ring

injection, kicker, storage-ring, optics

840

B. Singh, M. Apollonio, R. Bartolini, I.P.S. Martin
DLS, Oxfordshire, United Kingdom
A. Alekou, R. Bartolini, T. Pulampong
JAI, Oxford, United Kingdom

Injection studies using a non-linear kicker for the Diamond storage ring have been carried out previously*. These studies have been recently extended to investigate whether the non-linear kicker can be located in the injection straight downstream of the septum and outside the existing dipole kicker bump. If so, injection with a non-linear kicker becomes independent of the optics used, making it suitable for use in both standard and low alpha mode. With this configuration, the existing injection scheme could also be left in place, leaving open the possibility to study both schemes in situ before potentially removing the existing dipole kickers at a later date. In order to operate with the non-linear kicker, the injected beam needs to exit the transfer line at an angle of 3mrad; this has been successfully demonstrated during machine development time. The concept and feasibility studies of this scheme are presented in this paper.
* T. Pulampong, et al., Proc. IPAC 2013, Shanghai, WEPWA065, (2013)

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TUOBA01

Beam Commissioning of SuperKEKB

optics, coupling, vacuum, detector

1019

Y. Funakoshi, T. Abe, T. Adachi, K. Akai, Y. Arimoto, K. Egawa, Y. Enomoto, J.W. Flanagan, H. Fukuma, K. Furukawa, N. Iida, H. Iinuma, H. Ikeda, T. Ishibashi, M. Iwasaki, T. Kageyama, H. Kaji, T. Kamitani, T. Kawamoto, S. Kazama, M. Kikuchi, T. Kobayashi, K. Kodama, H. Koiso, M. Masuzawa, T. Mimashi, T. Miura, F. Miyahara, T. Mori, A. Morita, S. Nakamura, T.T. Nakamura, H. Nakayama, T. Natsui, M. Nishiwaki, K. Ohmi, Y. Ohnishi, T. Oki, S. Sasaki, M. Satoh, Y. Seimiya, K. Shibata, M. Suetake, Y. Suetsugu, H. Sugimoto, M. Tanaka, M. Tawada, S. Terui, M. Tobiyama, S. Uehara, S. Uno, X. Wang, K. Watanabe, Y. Yano, S.I. Yoshimoto, R. Zhang, D. Zhou, X. Zhou, Z.G. Zong
KEK, Ibaraki, Japan
D. El Khechen
LAL, Orsay, France

In this report, we describe the machine operation in the first 3 months of the Phase 1 commissioning of SuperKEKB. The beam commissioning is smoothly going on. Vacuum scrubbing, the optics corrections and others are described.

Slides TUOBA01 [9.346 MB]

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TUPMB017

The Injection Septum Magnet for the Collector Ring (FAIR)

injection, vacuum, operation, lattice

1145

P.Yu. Shatunov, D.E. Berkaev, I. Koop, E.P. Semenov, D.B. Shwartz
BINP SB RAS, Novosibirsk, Russia
A. Dolinskyy, S.A. Litvinov
GSI, Darmstadt, Germany
Yu. A. Rogovsky
Budker INP & NSU, Novosibirsk, Russia

Collector Ring is one of the key installations of the FAIR project (Darmstadt, Germany). It is dedicated for stochastic cooling of incoming beams of antiprotons and rare ions. Additionally there is a mode of operation for experiments in the ring. Beams for all modes of operation are injected through one transfer channel. Extremely high acceptance of the ring (240 mm*mrad) leads to large apertures of all magnetic elements including the septum magnet. Meanwhile planned parameters of the magnetic field and magnetic field quality are comparatively strict. The present state of the design of the pulsed injection septum for the CR is presented in this article together with the concept of the injection system.

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TUPMR039

The Development of a New High Field Injection Septum Magnet System for Main Ring of J-Parc

injection, operation, power-supply, flattop

1337

T. Shibata, K. Ishii, H. Matsumoto, N. Matsumoto, T. Sugimoto
KEK, Ibaraki, Japan
K. Fan
HUST, Wuhan, People's Republic of China

We are improving the Main Ring (MR) for beam power of 750 kw which is the first goal of J-PARC. The repetition period of the fast extraction must be short to 1.3 second from the current period of 2.48 second for the improvement of the beam power. It is necessary to exchange a high field injection septum magnet which will be installed at the injection line from RCS to MR and its power supply, because the current injection septum system can not be operated with 1.3 second repetition. Since confirmed the large leakage field around current circling beam line of the injection magnet, we must improve the shielding structure which make low leakage field. We started the development of the new injection septum magnet and its power supply in 2013. It can operate with 1 Hz repetition and the low leakage field which its order is 10^-4 of the gap field. The new Injection septum magnet and the new power supply were constructed in Winter of 2014. We had many improvement of the magnet and power supply. We will install the new injection septum magnet system in this summer. In this presentation, we will report the detail of the results of its performance.

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TUPMR040

The Development of a New Low Field Septum Magnet System for Fast Extraction in Main Ring of J-PARC

operation, power-supply, vacuum, extraction

1340

T. Shibata, K. Ishii, H. Matsumoto, N. Matsumoto, T. Sugimoto
KEK, Ibaraki, Japan
K. Fan
HUST, Wuhan, People's Republic of China

The J-PARC Main Ring (MR) is being upgraded to improve its beam power to the design goal of 750 kW. One important way is to reduce the repetition period from 2.48 s to 1.3 s so that the beam power can be nearly doubled. We need to improve the septum magnets for fast extraction. We are improving the magnets and their power supplies. The present magnets which is conventional type have problem in durability of septum coil by its vibration, and large leakage field. The new magnets are eddy current type. The eddy current type does not have septum coil, but has a thin plate. We expect that there is no problem in durability, we can construct the thin septum plate, the leakage field can be reduced. The output of the present power supply are pattern current which of flat top is 10 ms width, the new one is short pulse which of one is 10 us. The short pulse consists of 1st and 3rd higher harmonic. We can expect that the flatness and reproducibility of flat top current can be improved. The calorific power can be also reduced. This paper will report the field measurement results with the eddy septum magnet systems.

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TUPMR047

Conceptual Design Considerations for the 50 TeV FCC Beam Dump Insertion

extraction, kicker, collimation, optics

1356

F. Burkart, M.G. Atanasov, W. Bartmann, B. Goddard, T. Kramer, A. Lechner, A. Sanz Ull, D. Schulte, L.S. Stoel
CERN, Geneva, Switzerland
D. Barna
University of Tokyo, Tokyo, Japan

Safely extracting and absorbing the 50 TeV proton beams of the FCC-hh collider will be a major challenge. Two extended straight sections (ESS) are dedicated to beam dumping system and collimation. The beam dumping system will fast-extract the beam and transport it to an external absorber, while the collimation system will protect the superconducting accelerator components installed further downstream. The high stored beam energy of about 8.5 GJ per beam means that machine protection considerations will severely constrain the functional design of the ESS and the beam dump line geometry, in addition to dominating the performance specifications of the main sub-systems like kickers and absorber blocks. The general features, including concept choice, optics in the ESS and beam dump line, passive protection devices, layout and integration are described and discussed.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR047

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WEPMR056

Septum Magnet using a Superconducting Shield

shielding, extraction, radiation, dipole

2402

D. Barna
University of Tokyo, Tokyo, Japan
F. Burkart
CERN, Geneva, Switzerland

A field-free region can be created within a dipole magnet using a superconducting shield, which maintains persistent eddy currents induced during the ramp-up of the magnet. We will study the possibility to realize a high-field superconducting septum magnet using this principle. Properties of different configurations will be presented, and compared to the requirements of the FCC dump system.

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WEPMW011

Stable Spin Direction Investigations in RHIC

kicker, extraction, emittance, injection

2442

F. Méot, H. Huang, N. Tsoupas
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.
Beam and spin dynamics investigations are part of the preparations and studies regarding RHIC collider runs, they are part as well of the efforts dedicated to improving stored beam polarization, and in view of the eRHIC EIC project. Some recent studies and their outcomes are discussed.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMW011

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WEPOW024

Commissioning of SESAME Booster

booster, injection, quadrupole, extraction

2880

M. Attal, I.A. Abid, T.H. Abu-Hanieh, H. Al-Mohammad, M.A. Al-Najdawi, D.S. Foudeh, A. Hamad, E. Huttel, A. Ismail, S.Kh. Jafar, F. Makahleh, M. Mansouri Sharifabad, K. Manukyan, I. Saleh, N.Kh. Sawai, M.M. Shehab
SESAME, Allan, Jordan

Commissioning of the 800 MeV booster of SESAME light source started in December 2013. The 38.4 m circumference booster is a part of SESAME injector which includes also a 20 MeV classical microtron as a pre-injector that is in operation since 2012. The main results and experience obtained during the commissioning period are reported in this paper.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW024

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THPMR016

Horizontal Phase Space Shaping for Optimized Off-axis Injection Efficiency

injection, sextupole, optics, lattice

3424

S.M. White, S. Lagarde, S.M. Liuzzo, B. Ogier, T.P. Perron, P. Raimondi
ESRF, Grenoble, France

With the introduction of top-up operation at the ESRF it becomes important to reduce as much as possible any kind of perturbation seen by the users during injection. For this purpose, a novel technique to improve injection efficiency by shaping the horizontal beam phase space to better match the storage ring acceptance and hence reduce the duration of injections was developed. Theoretical concept, simulations and first experimental results are presented.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR016

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THPMR043

Performance of Transverse Beam Splitting and Extraction at the CERN Proton Synchrotron in the Framework of Multi-turn Extraction

extraction, proton, resonance, sextupole

3492

G. Sterbini, J.C.C.M. Borburgh, S. Damjanovic, S.S. Gilardoni, M. Giovannozzi, C. Hernalsteens, M. Hourican, A. Huschauer, K. Kahle, G. Le Godec, O. Michels
CERN, Geneva, Switzerland
C. Hernalsteens
EPFL, Lausanne, Switzerland

Considerable progress has been made in 2015 in the setting up of the multi-turn extraction (MTE) in the CERN Proton Synchrotron (PS). A key ingredient in this novel extraction technique is the beam splitting in transverse phase space. This manipulation is based on adiabatic trapping in stable islands of transverse phase space and requires mastering a number of devices in the PS ring. In addition, an in-depth review of all fast extractions schemes in the PS had been required due to the development and installation of a dummy septum to shield the actual magnetic septum. In this paper, the current performance of the beam splitting and of the extraction including the shadowing effect is presented. Future lines of development will also be discussed.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR043

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THPOR048

Beam Losses at CERNs PS and SPS Measured with Diamond Particle Detectors

extraction, detector, injection, kicker

3898

F. Burkart, W. Bartmann, B. Dehning, E. Effinger, M.A. Fraser, B. Goddard, V. Kain, O. Stein
CERN, Geneva, Switzerland
E. Griesmayer
CIVIDEC Instrumentation, Wien, Austria
O. Stein
University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany

Diamond particle detectors have been used in the LHC to measure fast particle losses with a nanosecond time resolution. In addition, these detectors were installed in the PS and the SPS. The detectors are mounted close to the extraction septum of the PS (transfer line to SPS) and the SPS (transfer lines TI2 and TI8 to LHC). Mainly, they monitor the losses occurring during the extraction process but the detectors are also able to measure turn-by-turn losses in the accelerators. In addition, detailed studies concerning losses due to ghost bunches were performed. This paper will describe the installed diamond detector setup, discuss the measurement results and possible loss mitigations.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR048

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THPOW032

Experimental Test on the TPS Booster Injection Scheme Exploration and the Associated Bunch Train Analysis

injection, booster, kicker, operation

4008

H.-P. Chang, C.L. Chen, C.-S. Fann, K.T. Hsu, S.Y. Hsu, K.-K. Lin, K.L. Tsai
NSRRC, Hsinchu, Taiwan

In order to explore the tuning range of injection septum and kicker for TPS booster operation, an experimental test on the designed injection scheme has been performed. Tuning of these injection units is based on the top-up operation process for storage ring vacuum cleaning purpose. It is set for a fast beam accumulation in the storage ring where the stored beam variation range is selected for efficient operation consideration. The measurement results of booster beam current variation while tuning of injection septum and kicker are presented. A preliminary analysis concerning the observation of deteriorated phase space acceptance in the TPS booster is given in this report. This study also includes an effort to extend the present available operation bunch train for TPS booster. It shows that the increase of the booster beam current by bunch train tuning indicates an upper bound of about 400 ns.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW032

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THPOW034

TLS Booster Injection Scheme Exploration

booster, injection, kicker, electron

4016

H.H. Chen, H.-P. Chang, H.C. Chen, S.J. Huang, C.H. Kuo, A.P. Lee, J.A. Li, K.-K. Lin, Y.K. Lin
NSRRC, Hsinchu, Taiwan

In this paper, the booster injection efficiency and the parameter working range related to key components in-cluding septum magnet and kicker magnet for Taiwan Light Source (TLS) injector operation are introduced. Booster injection scheme for different lattice is explored by machine study plan using injector property. The study result may be used by the operator as booster injection parameter fine tuning reference. It is also helpful for the advanced injection scheme exploration.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW034

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THPOW050

Upgrade of Septum Magnets of the Transfer Line in TPS

injection, power-supply, simulation, booster

4057

C.S. Yang, C.-H. Chang, Y.L. Chu, J.C. Huang, C.-S. Hwang, J.C. Jan, F.-Y. Lin
NSRRC, Hsinchu, Taiwan

Taiwan Photon Source (TPS) is a 3-GeV light source. The full current of the storage beam and commissioning of insertion devices are still in progress. An improved injection between the booster ring (BR) and the storage ring (SR) was implemented to increase the efficiency of injection and the reliability of the electrical parts. A DC septum (length 0.8 m) was replaced with an AC septum (length 1 m, type C) to decrease the leakage field and to relax the loading of the power supply. Mapping the field with mu-metal shielding was also implemented to diminish the leakage field from the AC septum. The lattice of the transfer line between the booster ring and the storage ring, BTS, was also rearranged to meet the new injection requirements. The performance of the AC septum with mu-metal shielding and the upgrade of the BTS lattice are discussed in this paper.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW050

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THPOY033

SIS100 Availability and Machine Protection

ion, dipole, proton, extraction

4171

C. Omet, H. Kisker, M.S. Mandakovic, D. Ondreka, P.J. Spiller, R.J. Steinhagen
GSI, Darmstadt, Germany

For the future FAIR driver accelerator, SIS100, a detailed System-FMEA (Failure Modes and Effects Analysis) according to IEC 61508 has been done. One the one hand, this has been done to identify possible shortcomings for machine protection and on the other hand to predict the machine's availabilty for beam on target. The methodology for the analysis and the main failure modes currently known for the machine and its environment are described in detail. An estimate of the total machine's availability is given.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY033

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