IBIC2013 - List of Keywords (quadrupole)

Paper	Title	Other Keywords	Page
MOCL3	Emittance and Momentum Diagnostics for Beams with Large Momentum Spread	CLIC, emittance, diagnostics, transverse	37
	M. Olvegård, V.G. Ziemann Uppsala University, Uppsala, Sweden
	In the drive beam complex of CLIC, but also in plasma wakefield accelerators, the momentum spread can be on the order of tens of percent while conventional diagnostic methods often assume a very small momentum spread. This leads to systematic misinterpretations of the measurements. Spectrometry and emittance measurements based on quadrupole scan rely on measuring the beam size, which depends on the beam envelope. This, in turn, depends on the momentum distribution. We have studied the systematic errors that arise and developed novel algorithms to correctly analyze these measurements for arbitrary momentum distributions. As an application we consider the CLIC drive beam decelerator, where extraction of up to 90% of the kinetic energy leads to a very large momentum spread. We study a measurement of the time-resolved momentum distribution, based on sweeping the beam in a circular pattern and recording the beam size on a screen using optical transition radiation. We present the algorithm to extract the time-resolved momentum distribution, together with simulation results to prove its applicability.
	Slides MOCL3 [2.984 MB]

MOPC47	Monte Carlo Simulations of Beam Losses in the Test Beam Line of CTF3	beam-losses, electron, CLIC, simulation	189
	E. Nebot Del Busto, S. Mallows, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom E. Branger Linköping University, Linköping, Sweden S. Döbert, E.B. Holzer, R.L. Lillestøl, S. Mallows, E. Nebot Del Busto CERN, Geneva, Switzerland R.L. Lillestøl University of Oslo, Oslo, Norway C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom
	The Test Beam Line (TBL) of the CLIC Test Facility 3 (CTF3) aims to validate the drive beam deceleration concept of CLIC, in which the RF power requested to boost particles to multi-TeV energies is obtained via deceleration of a high current and low energy drive beam (DB). Despite a TBL beam energy (150-80 MeV) significantly lower than the minimum nominal energy of the CLIC DB (250 MeV), the pulse time structure of the TBL provides the opportunity to measure beam losses with CLIC-like DB timing conditions. In this contribution, a simulation study on the detection of beam losses along the TBL for the commissioning of the recently installed beam loss monitoring system is presented. The most likely loss locations during stable beam conditions are studied by considering the beam envelope defined by the FODO lattice as well as the emittance growth due to the deceleration process. Moreover, the optimization of potential detector locations is discussed. Several factors are considered, namely: the distance to the beam, the shielding provided by the different elements of the line, the detector sensitivity and possible saturation effects of both the radiation detectors and electronics.

MOPF34	Nuclotron Deuterons Beam Parameters Measurements Using SSNTD	target, dipole, vacuum, synchrotron	299
	K.V. Husak, V.V. Bukhal The Joint Institute of Power and Nuclear Reserach - "SOSNY" NASB, Minsk, Belarus M. Artiushenko, V.V. Sotnikov, V.A. Voronko NSC/KIPT, Kharkov, Ukraine A.A. Patapenka, A.A. Safronava, I.V. Zhuk JIPNR-Sosny NASB, Minsk, Belarus
	ADS are considered as prospective nuclear installations for energy production and nuclear waste transmutation or recycling. The international project “Energy and Transmutation Radioactive Wastes” running in the Laboratory of High Energy Physics at JINR (Dubna, Russia) at the accelerator complex “Nuclotron” is aimed at a feasibility study of using a deeply subcritical natural or depleted uranium or thorium active core with very hard neutron spectrum inside for effective burning of the core material together with spent nuclear fuel. For any ADS experiment a necessary and a key element is beam diagnostics. In this paper a technique for precise measurement of deuteron beam parameters using SSNTD, developed within the bounds of “E&T RAW” project, is presented. The deuteron beam parameters, specifically beam shape, size and position on a target, are obtained from track density distribution on the irradiated track detectors. The presented technique has a resolution of 1 mm. The experimental results of beam parameter measurements for deuterons with energies of 2, 4 and 8 GeV at the irradiation of the uranium subcritical assembly “QUINTA”, obtained with the SSNTD technique, are presented.
	Poster MOPF34 [0.826 MB]

TUPF17	Phase Space Measurement using X-ray Pinhole Camera at SSRF	emittance, storage-ring, photon, radiation	539
	K.R. Ye, J. Chen, Z.C. Chen, G.Q. Huang, Y.B. Leng, L.Y. Yu, W.M. Zhou SINAP, Shanghai, People's Republic of China
	Since 2009 an X-ray pinhole camera that has been used to present the transverse beam size on diagnostic beamline of the storage ring in Shanghai Synchrotron Radiation Facility (SSRF). Transverse beam profiles in the real(x,y) and phase(Y,Y’) spaces are obtained by an X-ray pinhole camera sensitive by moving one pinhole. The large amount of collected data has allowed a detailed reconstruction of the transverse phase space evolution in this paper. An image on a fluorescent screen is observed by a CCD camera，digitized and stored, then the phase space and the real space profiles are reconstructed．A non-linear least square program fits the resultant profiles to a vertical dimensional Gaussian distributions to derive the phase space and emittances for SSRF storage ring．

WECL2	Radiation Damages and Characterization in the SOLEIL Storage Ring	radiation, dipole, vacuum, SOLEIL	644
	N. Hubert, P. Brunelle, N. Béchu, L. Cassinari, C. Herbeaux, S. Hustache, J.-F. Lamarre, P. Lebasque, F. Marteau, A. Nadji, L.S. Nadolski SOLEIL, Gif-sur-Yvette, France
	After six years of operation, equipment located close to some vacuum chambers of the SOLEIL storage ring show unexpected damages due to radiation. It has been pointed out that, inside the so called “quadrupole” vacuum chambers, fluorescence X-rays are emitted by the materials that intercept upstream dipole synchrotron radiation. The energy of the emitted X-ray is too high to be significantly attenuated by the aluminum of which the vacuum chamber is made. Diagnostics and means used to characterize this radiation are presented, and measurements are compared to calculations.
	Slides WECL2 [2.336 MB]

WEPC02	Project PROMETHEUS: Design and Construction of a Radio Frequency Quadrupole at TAEK	rfq, ion, ion-source, diagnostics	652
	G. Turemen, B. Yasatekin Ankara University, Faculty of Sciences, Ankara, Turkey Y. Akgun, A. Alacakir, A.S. Bolukdemir, E. Durukan, H. Karadeniz, E. Recepoğlu TAEK, Ankara, Turkey E. Cavlan TOBB ETU, Ankara, Turkey M. Celik, Z. Sali Gazi University, Faculty of Arts and Sciences, Teknikokullar, Ankara, Turkey S. Erhan UCLA, Los Angeles, California, USA Ö. Mete UMAN, Manchester, United Kingdom G. Unel UCI, Irvine, California, USA
	The PROMETHEUS Project is ongoing for the design and development of a 4-vane radio frequency quadrupole (RFQ) with its H⁺ ion source, a low energy beam transport (LEBT) line and diagnostics section. The main goal of the project is to achieve the acceleration of the low energy ions up to 1.5 MeV by an RFQ (352 MHz) shorter than 2 m. A plasma ion source is being developed to produce a 20 keV, 1 mA H⁺ beam. Ion source, transmission and beam dynamics in the RFQ are discussed through simulation results. In addition, analytical studies were also performed resulting into an RFQ design code, DEMIRCI as discussed and presented here in comparison with various existing software. As a result of the simulations, beam transmission of 99% was achieved at 1.7 m downstream reaching energy of 1.5 MeV. As the first phase an Aluminum RFQ prototype, the so-called cold model, will be built for low power RF characterization. In this contribution the status of the project, design considerations, simulation results, the various diagnostics techniques and RFQ fabrication issues are discussed.
	Poster WEPC02 [25.664 MB]

WEPC43	Update on Beam Loss Monitoring at CTF3 for CLIC	CLIC, DIAMOND, beam-losses, photon	787
	L.J. Devlin, S. Mallows, C.P. Welsch, E.N. del Busto Cockcroft Institute, Warrington, Cheshire, United Kingdom E. Branger Linköping University, Linköping, Sweden L.J. Devlin, S. Mallows, C.P. Welsch, E.N. del Busto The University of Liverpool, Liverpool, United Kingdom E. Effinger, E.B. Holzer, S. Mallows, E.N. del Busto CERN, Geneva, Switzerland
	Funding: Work supported by STFC Cockcroft Institute Core Grant No. ST/G008248/1 The primary role of the beam loss monitoring (BLM) system for the compact linear collider (CLIC) study is to work within the machine protection system. Due to the size of the CLIC facility, a BLM that covers large distances along the beamline is highly desirable, in particular for the CLIC drive beam decelerators, which would alternatively require some ~40,000 localised monitors. Therefore, an optical fiber BLM system is currently under investigation which can cover large sections of beamline at a time. A multimode fiber has been installed along the Test Beam Line at the CLIC test facility (CTF3) where the detection principle is based on the production of Cherenkov photons within the fiber resulting from beam loss and their subsequent transport along the fiber where they are then detected at the fiber ends using silicon photomultipliers. Several additional monitors including ACEMs, PEP-II and diamond detectors have also been installed. In this contribution the first results from the BLMs are presented, comparisons of the signals from each BLM are made and the possible achievable longitudinal resolution from the fiber BLM signal considering various loss patterns is discussed.

Paper

Title

Other Keywords

Page

MOCL3

Emittance and Momentum Diagnostics for Beams with Large Momentum Spread

CLIC, emittance, diagnostics, transverse

37

M. Olvegård, V.G. Ziemann
Uppsala University, Uppsala, Sweden

In the drive beam complex of CLIC, but also in plasma wakefield accelerators, the momentum spread can be on the order of tens of percent while conventional diagnostic methods often assume a very small momentum spread. This leads to systematic misinterpretations of the measurements. Spectrometry and emittance measurements based on quadrupole scan rely on measuring the beam size, which depends on the beam envelope. This, in turn, depends on the momentum distribution. We have studied the systematic errors that arise and developed novel algorithms to correctly analyze these measurements for arbitrary momentum distributions. As an application we consider the CLIC drive beam decelerator, where extraction of up to 90% of the kinetic energy leads to a very large momentum spread. We study a measurement of the time-resolved momentum distribution, based on sweeping the beam in a circular pattern and recording the beam size on a screen using optical transition radiation. We present the algorithm to extract the time-resolved momentum distribution, together with simulation results to prove its applicability.

Slides MOCL3 [2.984 MB]

MOPC47

Monte Carlo Simulations of Beam Losses in the Test Beam Line of CTF3

beam-losses, electron, CLIC, simulation

189

E. Nebot Del Busto, S. Mallows, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom
E. Branger
Linköping University, Linköping, Sweden
S. Döbert, E.B. Holzer, R.L. Lillestøl, S. Mallows, E. Nebot Del Busto
CERN, Geneva, Switzerland
R.L. Lillestøl
University of Oslo, Oslo, Norway
C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom

The Test Beam Line (TBL) of the CLIC Test Facility 3 (CTF3) aims to validate the drive beam deceleration concept of CLIC, in which the RF power requested to boost particles to multi-TeV energies is obtained via deceleration of a high current and low energy drive beam (DB). Despite a TBL beam energy (150-80 MeV) significantly lower than the minimum nominal energy of the CLIC DB (250 MeV), the pulse time structure of the TBL provides the opportunity to measure beam losses with CLIC-like DB timing conditions. In this contribution, a simulation study on the detection of beam losses along the TBL for the commissioning of the recently installed beam loss monitoring system is presented. The most likely loss locations during stable beam conditions are studied by considering the beam envelope defined by the FODO lattice as well as the emittance growth due to the deceleration process. Moreover, the optimization of potential detector locations is discussed. Several factors are considered, namely: the distance to the beam, the shielding provided by the different elements of the line, the detector sensitivity and possible saturation effects of both the radiation detectors and electronics.

MOPF34

Nuclotron Deuterons Beam Parameters Measurements Using SSNTD

target, dipole, vacuum, synchrotron

299

K.V. Husak, V.V. Bukhal
The Joint Institute of Power and Nuclear Reserach - "SOSNY" NASB, Minsk, Belarus
M. Artiushenko, V.V. Sotnikov, V.A. Voronko
NSC/KIPT, Kharkov, Ukraine
A.A. Patapenka, A.A. Safronava, I.V. Zhuk
JIPNR-Sosny NASB, Minsk, Belarus

ADS are considered as prospective nuclear installations for energy production and nuclear waste transmutation or recycling. The international project “Energy and Transmutation Radioactive Wastes” running in the Laboratory of High Energy Physics at JINR (Dubna, Russia) at the accelerator complex “Nuclotron” is aimed at a feasibility study of using a deeply subcritical natural or depleted uranium or thorium active core with very hard neutron spectrum inside for effective burning of the core material together with spent nuclear fuel. For any ADS experiment a necessary and a key element is beam diagnostics. In this paper a technique for precise measurement of deuteron beam parameters using SSNTD, developed within the bounds of “E&T RAW” project, is presented. The deuteron beam parameters, specifically beam shape, size and position on a target, are obtained from track density distribution on the irradiated track detectors. The presented technique has a resolution of 1 mm. The experimental results of beam parameter measurements for deuterons with energies of 2, 4 and 8 GeV at the irradiation of the uranium subcritical assembly “QUINTA”, obtained with the SSNTD technique, are presented.

Poster MOPF34 [0.826 MB]

TUPF17

Phase Space Measurement using X-ray Pinhole Camera at SSRF

emittance, storage-ring, photon, radiation

539

K.R. Ye, J. Chen, Z.C. Chen, G.Q. Huang, Y.B. Leng, L.Y. Yu, W.M. Zhou
SINAP, Shanghai, People's Republic of China

Since 2009 an X-ray pinhole camera that has been used to present the transverse beam size on diagnostic beamline of the storage ring in Shanghai Synchrotron Radiation Facility (SSRF). Transverse beam profiles in the real(x,y) and phase(Y,Y’) spaces are obtained by an X-ray pinhole camera sensitive by moving one pinhole. The large amount of collected data has allowed a detailed reconstruction of the transverse phase space evolution in this paper. An image on a fluorescent screen is observed by a CCD camera，digitized and stored, then the phase space and the real space profiles are reconstructed．A non-linear least square program fits the resultant profiles to a vertical dimensional Gaussian distributions to derive the phase space and emittances for SSRF storage ring．

WECL2

Radiation Damages and Characterization in the SOLEIL Storage Ring

radiation, dipole, vacuum, SOLEIL

644

N. Hubert, P. Brunelle, N. Béchu, L. Cassinari, C. Herbeaux, S. Hustache, J.-F. Lamarre, P. Lebasque, F. Marteau, A. Nadji, L.S. Nadolski
SOLEIL, Gif-sur-Yvette, France

After six years of operation, equipment located close to some vacuum chambers of the SOLEIL storage ring show unexpected damages due to radiation. It has been pointed out that, inside the so called “quadrupole” vacuum chambers, fluorescence X-rays are emitted by the materials that intercept upstream dipole synchrotron radiation. The energy of the emitted X-ray is too high to be significantly attenuated by the aluminum of which the vacuum chamber is made. Diagnostics and means used to characterize this radiation are presented, and measurements are compared to calculations.

Slides WECL2 [2.336 MB]

WEPC02

Project PROMETHEUS: Design and Construction of a Radio Frequency Quadrupole at TAEK

rfq, ion, ion-source, diagnostics

652

G. Turemen, B. Yasatekin
Ankara University, Faculty of Sciences, Ankara, Turkey
Y. Akgun, A. Alacakir, A.S. Bolukdemir, E. Durukan, H. Karadeniz, E. Recepoğlu
TAEK, Ankara, Turkey
E. Cavlan
TOBB ETU, Ankara, Turkey
M. Celik, Z. Sali
Gazi University, Faculty of Arts and Sciences, Teknikokullar, Ankara, Turkey
S. Erhan
UCLA, Los Angeles, California, USA
Ö. Mete
UMAN, Manchester, United Kingdom
G. Unel
UCI, Irvine, California, USA

The PROMETHEUS Project is ongoing for the design and development of a 4-vane radio frequency quadrupole (RFQ) with its H⁺ ion source, a low energy beam transport (LEBT) line and diagnostics section. The main goal of the project is to achieve the acceleration of the low energy ions up to 1.5 MeV by an RFQ (352 MHz) shorter than 2 m. A plasma ion source is being developed to produce a 20 keV, 1 mA H⁺ beam. Ion source, transmission and beam dynamics in the RFQ are discussed through simulation results. In addition, analytical studies were also performed resulting into an RFQ design code, DEMIRCI as discussed and presented here in comparison with various existing software. As a result of the simulations, beam transmission of 99% was achieved at 1.7 m downstream reaching energy of 1.5 MeV. As the first phase an Aluminum RFQ prototype, the so-called cold model, will be built for low power RF characterization. In this contribution the status of the project, design considerations, simulation results, the various diagnostics techniques and RFQ fabrication issues are discussed.

Poster WEPC02 [25.664 MB]

WEPC43

Update on Beam Loss Monitoring at CTF3 for CLIC

CLIC, DIAMOND, beam-losses, photon

787

L.J. Devlin, S. Mallows, C.P. Welsch, E.N. del Busto
Cockcroft Institute, Warrington, Cheshire, United Kingdom
E. Branger
Linköping University, Linköping, Sweden
L.J. Devlin, S. Mallows, C.P. Welsch, E.N. del Busto
The University of Liverpool, Liverpool, United Kingdom
E. Effinger, E.B. Holzer, S. Mallows, E.N. del Busto
CERN, Geneva, Switzerland

Funding: Work supported by STFC Cockcroft Institute Core Grant No. ST/G008248/1
The primary role of the beam loss monitoring (BLM) system for the compact linear collider (CLIC) study is to work within the machine protection system. Due to the size of the CLIC facility, a BLM that covers large distances along the beamline is highly desirable, in particular for the CLIC drive beam decelerators, which would alternatively require some ~40,000 localised monitors. Therefore, an optical fiber BLM system is currently under investigation which can cover large sections of beamline at a time. A multimode fiber has been installed along the Test Beam Line at the CLIC test facility (CTF3) where the detection principle is based on the production of Cherenkov photons within the fiber resulting from beam loss and their subsequent transport along the fiber where they are then detected at the fiber ends using silicon photomultipliers. Several additional monitors including ACEMs, PEP-II and diamond detectors have also been installed. In this contribution the first results from the BLMs are presented, comparisons of the signals from each BLM are made and the possible achievable longitudinal resolution from the fiber BLM signal considering various loss patterns is discussed.