IBIC2016 - List of Keywords (optics)

Paper	Title	Other Keywords	Page
MOPG40	Performance Studies of a Single Vertical Beam Halo Collimation System at ATF2	background, collimation, simulation, wakefield	139
	N. Fuster-Martínez, A. Faus-Golfe IFIC, Valencia, Spain P. Bambade, A. Faus-Golfe, S. Wallon, R.J. Yang LAL, Orsay, France K. Kubo, T. Okugi, T. Tauchi, N. Terunuma Sokendai, Ibaraki, Japan K. Kubo, T. Okugi, T. Tauchi, N. Terunuma KEK, Ibaraki, Japan I. Podadera, F. Toral CIEMAT, Madrid, Spain
	Funding: Work supported by IDC-20101074, FPA2013-47883-C2-1-P and ANR-11-IDEX-0003-02 In order to reduce the background that could limit the precision of the diagnostics located in the ATF2 post-IP beamline, a single vertical beam halo collimation system was installed in March 2016. In this paper we present the measurements done in March and May 2016 in order to characterize the collimation system performance. Furthermore, the collimator wakefield impact has also been measured and compared with theoretical calculations and numerical simulations in order to determine the most efficient operation mode of the collimation system in terms of halo cleaning and negligible wakefield impact.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG40
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MOPG70	Transverse Beam Profiling and Vertical Emittance Control with a Double-Slit Stellar Interferometer	controls, electron, coupling, radiation	236
	W.J. Corbett, X. Huang, J. Wu SLAC, Menlo Park, California, USA C.L. Li, W.J. Zhang East China University of Science and Technology, Shanghai, People's Republic of China T.M. Mitsuhashi KEK, Ibaraki, Japan Y.H. Xu DongHua University, Songjiang, People's Republic of China W.J. Zhang University of Saskatchewan, Saskatoon, Canada
	Double-slit interferometers are useful tools to measure the transverse the cross-section of relativistic charged particle beams emitting incoherent synchrotron radiation. By rotating the double-slit about the beam propagation axis, the transverse beam profile can be reconstructed including beam tilt at the source. The interferometer can also be used as a sensitive monitor for vertical emittance control. In this paper we outline a simple derivation of the Van Cittert-Zernike theorem, present results for a rotating double-slit measurement and demonstrate application of the interferometer to vertical emittance control using the Robust Conjugate Direction Search (RCDS) optimization algorithm.
	Poster MOPG70 [1.362 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG70
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TUPG72	Calibration of X-ray Monitor during the Phase I of SuperKEKB commissioning	emittance, factory, detector, scattering	524
	E. Mulyani Sokendai, Ibaraki, Japan J.W. Flanagan KEK, Ibaraki, Japan
	X-ray monitors (XRM) have been installed in each SuperKEKB ring, the Low Energy Ring (LER) and High Energy Ring (HER), primarily for vertical beam size measurement. Both rings have been commissioned in Phase I of SuperKEKB operation (February-June 2016), and several XRM calibration studies have been carried out. The geometrical scale factors seems to be well understood for both LER and HER. The emittance knob ratio method yielded results consistent with expectations based on the machine model optics (vertical emittance ε_y is {§I{≈8}{pm}}). For the HER, the vertical emittance ε_y is {§I{≈41}{pm}}, which is 4× greater than the optics model expectation. Analysis of beam size and lifetime measurements suggests unexpectedly large point response functions, particularly in the HER.
	Poster TUPG72 [34.615 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG72
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPG74	Spot Size Measurements in the ELI-NP Compton Gamma Source	target, linac, diagnostics, radiation	532
	F. Cioeta, E. Chiadroni, G. Di Pirro, G. Franzini, V. Shpakov, A. Stella, A. Variola INFN/LNF, Frascati (Roma), Italy A. Cianchi INFN-Roma II, Roma, Italy M. Marongiu INFN-Roma, Roma, Italy A. Mostacci, L. Palumbo University of Rome La Sapienza, Rome, Italy
	A high brightness electron Linac is being built in the Compton Gamma Source at the ELI Nuclear Physics facility in Romania. To achieve the design luminosity, a train of 32, 16 ns spaced, bunches with a nominal charge of 250 pC will collide with the laser beam in the interaction point. Electron beam spot size is measured with an OTR (optical transition radiation) profile monitors. In order to measure the beam properties, the optical radiation detecting system must have the necessary accuracy and resolution. This paper deals with the studies of different optic configurations to achieve the magnification, resolution and accuracy desired considering design and technological constraints; we will compare several configurations of the optical detection line to justify the one chosen for the implementation in the Linac.
	Poster TUPG74 [44.049 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG74
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TUPG77	Experimental Results of a Compact Laserwire System for Non-Invasive H⁻ Beam Profile Measurements at CERN's Linac4	laser, linac, detector, electron	544
	S.M. Gibson, G.E. Boorman, A. Bosco Royal Holloway, University of London, Surrey, United Kingdom T. Hofmann, U. Raich, F. Roncarolo CERN, Geneva, Switzerland
	Funding: Support from UK STFC, grant ST/N001753/1. A non-invasive laserwire system is being developed for quasi-continuous monitoring of the transverse profile and emittance of the final 160 MeV beam at CERN's LINAC4. As part of these developments, a compact laser-based profile monitor was recently tested during LINAC4 commissioning at beam energies of 50 MeV, 80 MeV and 10⁷ MeV. A laser with a tunable pulse width (1-300 ns) and ~200 W peak power in a surface hutch delivers light via a 75 m LMA transport fibre to the accelerator. Automated scanning optics deliver a free space <150 micron width laserwire to the interaction chamber, where a transverse slice of the hydrogen ion beam is neutralised via photo-detachment. The liberated electrons are deflected by a low field dipole and captured by a sCVD diamond detector, that can be scanned in synchronisation with the laserwire position. The laserwire profile of the LINAC4 beam has been measured at all commissioning energies and is found in very good agreement with interpolated profiles from conventional SEM-grid and wire scanner measurements, positioned up and downstream of the laserwire setup. Improvements based on these prototype tests for the design of the final system are presented.
	Poster TUPG77 [3.695 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG77
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WEBL01	Beam Diagnostics Challenges for Beam Dynamics Studies	emittance, linac, diagnostics, quadrupole	577
	O.R. Jones CERN, Geneva, Switzerland
	This presentation will review the performance and limitations of present beam instrumentation in relation to beam dynamics studies, and give an overview of the main requirements from the accelerator physics community for new or improved measurements that need R&D effort from the beam diagnostics side.
	Slides WEBL01 [47.201 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEBL01
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WEPG09	Development of a Prototype Electro-Optic Beam Position Monitor at the CERN SPS	pick-up, polarization, laser, proton	634
	A. Arteche, A. Bosco, S.M. Gibson Royal Holloway, University of London, Surrey, United Kingdom N. Chritin, D. Draskovic, T. Lefèvre, T.E. Levens CERN, Geneva, Switzerland
	Funding: Project funded by UK STFC grant, ST/N001583/1 A novel electro-optic beam position monitor capable of rapidly (<50ps) monitoring transverse intra-bunch perturbations is under development for the HL-LHC project. The EO-BPM relies on the fast optical response of two pairs of electro-optic crystals, whose birefringence is modified by the passing electric field of a 1ns proton bunch. Analytic models of the electric field are compared with electromagnetic simulations. A preliminary opto-mechanical design of the EO-BPM was manufactured and installed at the CERN SPS in 2016. The prototype is equipped with two pairs of 5mm cubic LiNbO3 crystals, mounted in the horizontal and vertical planes. A polarized CW 780nm laser in the counting room transmits light via 160m of PM fibre to the SPS, where delivery optics directs light through a pair of crystals in the accelerator vacuum. The input polarization state to the crystal can be remotely controlled. The modulated light after the crystal is analyzed, fibre-coupled and recorded by a fast photodetector in the counting room. Following the recent installation, we present the detailed setup and report the latest status on commissioning the device in-situ at the CERN SPS.
	Poster WEPG09 [8.441 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG09
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WEPG49	A High Resolution Single-Shot Longitudinal Profile Diagnostic Using Electro-Optic Transposition	laser, diagnostics, electron, real-time	752
	D.A. Walsh, S.P. Jamison, E.W. Snedden STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom T. Lefèvre CERN, Geneva, Switzerland
	Funding: This work was funded by CERN through contract KE1866/DG/CLIC and carried out at STFC Daresbury Laboratory. Electro-Optic Transposition (EOT) is the basis for an improved longitudinal bunch profile diagnostic we are developing in ASTeC as part of the CLIC UK research program. The scheme consists of transposing the Cou-lomb field profile of an electron bunch into the intensity envelope of an optical pulse via the mixing processes that occur between a CW laser probe and Coulomb field in an electro-optic material. This transposed optical pulse can then be amplified and characterised using robust laser techniques ' in this case chirped pulse optical parametric amplification and frequency resolved optical gating, allowing the Coulomb field to be recovered. EOT is an improvement over existing techniques in terms of the achievable resolution which is limited by the EO material response itself, reduced complexity of the laser system required since nanosecond rather than femtosecond lasers are used, and insensitivity of the system to bunch-laser arrival time jitter due to using a nanosecond long probe. We present results showing the retrieval of a THz pulse (Coulomb field stand-in) which confirms the principle behind the EOT system.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG49
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPG51	A Transverse Deflecting Structure for the Plasma Wakefield Accelerator Experiment, FLASHForward	plasma, emittance, cavity, quadrupole	759
	R.T.P. D'Arcy, V. Libov, J. Osterhoff DESY, Hamburg, Germany
	The FLASHForward project at DESY is an innovative plasma-wakefield acceleration experiment, aiming to accelerate electron beams to GeV energies over a few centimeters of ionized gas. These accelerated beams must be of sufficient quality to be used in a free-electron laser; achievable only through rigorous analysis of both the drive- and accelerated-beam's longitudinal phase space. The pulse duration of these accelerated beams is typically in the few femtosecond range, and thus difficult to resolve with traditional diagnostic methods. In order to longitudinally resolve these very short bunch-lengths, it is necessary to utilize the properties of a transverse RF deflector (operating in the hybrid electromagnetic mode, HEM11), which provides a relation between longitudinal and transverse co-ordinates. It is proposed that this type of device, commonly known as a Transverse Deflecting Structure (TDS) due to its 'streaking' in the transverse plane, will be introduced to the FLASHForward beamline in order to perform these single-shot longitudinal phase space measurements. The initial investigations into the realization of this diagnostic tool are outlined.
	Poster WEPG51 [10.726 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG51
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WEPG78	BPM Based Optics Correction of the Solaris 1.5 GeV Storage Ring	storage-ring, closed-orbit, alignment, simulation	836
	A. Kisiel, P.B. Borowiec, P.P. Goryl, M.B. Jaglarz, M.P. Kopeć, A.M. Marendziak, S. Piela, P.S. Sagalo, M.J. Stankiewicz, A.I. Wawrzyniak Solaris, Kraków, Poland
	The Solaris is a novel approach for the third generation synchrotron light sources. The machine consists of 600 MeV linear injector and 1.5 GeV storage ring based on 12 compact Double Bend Achromat (DBA) magnets designed in MAX-IV Laboratory in Sweden. After the commissioning phase of the Solaris storage ring the optimization phase has been started along with the commissioning of the first beamline. An essential part of the beam diagnostics and instrumentation system in the storage ring are Beam Position Monitors (BPMs) based on 36 quarter-wave button BPMs spread along the ring. Proper calibration allowed to measure and correct several beam parameters like closed orbit, tune, chromaticity, dispersion and orbit response matrix. The results of the latest machine optimization including the orbit correction, beam-based alignment and BPM phase advance will be presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG78
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WEPG80	Optical Effects in High Resolution and High Dynamic Range Beam Imaging Systems	electron, background, diagnostics, radiation	844
	J. Wolfenden, R.B. Fiorito, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom M. Bergamaschi, R. Kieffer, T. Lefèvre, S. Mazzoni CERN, Geneva, Switzerland P. Karataev, K.O. Kruchinin JAI, Egham, Surrey, United Kingdom
	Optical systems are used to transfer light in beam diagnostics for a variety of imaging applications. The effect of the point spread function (PSF) of these optical systems on the resulting measurements is often approximated or misunderstood. It is imperative that the optical PSF is independently characterised, as this can severely impede the attainable resolution of a diagnostic measurement. A high quality laser and specially chosen optics have been used to generate an intense optical point source in order to accomplish such a characterisation. The point source was used to measure the PSFs of various electron-beam imaging systems. These systems incorporate a digital micro-mirror array, which was used to produce very high (>105) dynamic range images. The PSF was measured at each intermediary image plane of the optical system; enabling the origin of any perturbations to the PSF to be isolated and potentially mitigated. One of the characterised systems has been used for optical transition radiation (OTR) measurements of an electron beam at KEK-ATF2 (Tsukuba, Japan).
	Poster WEPG80 [1.851 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG80
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Paper

Title

Other Keywords

Page

MOPG40

Performance Studies of a Single Vertical Beam Halo Collimation System at ATF2

background, collimation, simulation, wakefield

139

N. Fuster-Martínez, A. Faus-Golfe
IFIC, Valencia, Spain
P. Bambade, A. Faus-Golfe, S. Wallon, R.J. Yang
LAL, Orsay, France
K. Kubo, T. Okugi, T. Tauchi, N. Terunuma
Sokendai, Ibaraki, Japan
K. Kubo, T. Okugi, T. Tauchi, N. Terunuma
KEK, Ibaraki, Japan
I. Podadera, F. Toral
CIEMAT, Madrid, Spain

Funding: Work supported by IDC-20101074, FPA2013-47883-C2-1-P and ANR-11-IDEX-0003-02
In order to reduce the background that could limit the precision of the diagnostics located in the ATF2 post-IP beamline, a single vertical beam halo collimation system was installed in March 2016. In this paper we present the measurements done in March and May 2016 in order to characterize the collimation system performance. Furthermore, the collimator wakefield impact has also been measured and compared with theoretical calculations and numerical simulations in order to determine the most efficient operation mode of the collimation system in terms of halo cleaning and negligible wakefield impact.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG40

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MOPG70

Transverse Beam Profiling and Vertical Emittance Control with a Double-Slit Stellar Interferometer

controls, electron, coupling, radiation

236

W.J. Corbett, X. Huang, J. Wu
SLAC, Menlo Park, California, USA
C.L. Li, W.J. Zhang
East China University of Science and Technology, Shanghai, People's Republic of China
T.M. Mitsuhashi
KEK, Ibaraki, Japan
Y.H. Xu
DongHua University, Songjiang, People's Republic of China
W.J. Zhang
University of Saskatchewan, Saskatoon, Canada

Double-slit interferometers are useful tools to measure the transverse the cross-section of relativistic charged particle beams emitting incoherent synchrotron radiation. By rotating the double-slit about the beam propagation axis, the transverse beam profile can be reconstructed including beam tilt at the source. The interferometer can also be used as a sensitive monitor for vertical emittance control. In this paper we outline a simple derivation of the Van Cittert-Zernike theorem, present results for a rotating double-slit measurement and demonstrate application of the interferometer to vertical emittance control using the Robust Conjugate Direction Search (RCDS) optimization algorithm.

Poster MOPG70 [1.362 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG70

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TUPG72

Calibration of X-ray Monitor during the Phase I of SuperKEKB commissioning

emittance, factory, detector, scattering

524

E. Mulyani
Sokendai, Ibaraki, Japan
J.W. Flanagan
KEK, Ibaraki, Japan

X-ray monitors (XRM) have been installed in each SuperKEKB ring, the Low Energy Ring (LER) and High Energy Ring (HER), primarily for vertical beam size measurement. Both rings have been commissioned in Phase I of SuperKEKB operation (February-June 2016), and several XRM calibration studies have been carried out. The geometrical scale factors seems to be well understood for both LER and HER. The emittance knob ratio method yielded results consistent with expectations based on the machine model optics (vertical emittance ε_y is {§I{≈8}{pm}}). For the HER, the vertical emittance ε_y is {§I{≈41}{pm}}, which is 4× greater than the optics model expectation. Analysis of beam size and lifetime measurements suggests unexpectedly large point response functions, particularly in the HER.

Poster TUPG72 [34.615 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG72

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TUPG74

Spot Size Measurements in the ELI-NP Compton Gamma Source

target, linac, diagnostics, radiation

532

F. Cioeta, E. Chiadroni, G. Di Pirro, G. Franzini, V. Shpakov, A. Stella, A. Variola
INFN/LNF, Frascati (Roma), Italy
A. Cianchi
INFN-Roma II, Roma, Italy
M. Marongiu
INFN-Roma, Roma, Italy
A. Mostacci, L. Palumbo
University of Rome La Sapienza, Rome, Italy

A high brightness electron Linac is being built in the Compton Gamma Source at the ELI Nuclear Physics facility in Romania. To achieve the design luminosity, a train of 32, 16 ns spaced, bunches with a nominal charge of 250 pC will collide with the laser beam in the interaction point. Electron beam spot size is measured with an OTR (optical transition radiation) profile monitors. In order to measure the beam properties, the optical radiation detecting system must have the necessary accuracy and resolution. This paper deals with the studies of different optic configurations to achieve the magnification, resolution and accuracy desired considering design and technological constraints; we will compare several configurations of the optical detection line to justify the one chosen for the implementation in the Linac.

Poster TUPG74 [44.049 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG74

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TUPG77

Experimental Results of a Compact Laserwire System for Non-Invasive H⁻ Beam Profile Measurements at CERN's Linac4

laser, linac, detector, electron

544

S.M. Gibson, G.E. Boorman, A. Bosco
Royal Holloway, University of London, Surrey, United Kingdom
T. Hofmann, U. Raich, F. Roncarolo
CERN, Geneva, Switzerland

Funding: Support from UK STFC, grant ST/N001753/1.
A non-invasive laserwire system is being developed for quasi-continuous monitoring of the transverse profile and emittance of the final 160 MeV beam at CERN's LINAC4. As part of these developments, a compact laser-based profile monitor was recently tested during LINAC4 commissioning at beam energies of 50 MeV, 80 MeV and 10⁷ MeV. A laser with a tunable pulse width (1-300 ns) and ~200 W peak power in a surface hutch delivers light via a 75 m LMA transport fibre to the accelerator. Automated scanning optics deliver a free space <150 micron width laserwire to the interaction chamber, where a transverse slice of the hydrogen ion beam is neutralised via photo-detachment. The liberated electrons are deflected by a low field dipole and captured by a sCVD diamond detector, that can be scanned in synchronisation with the laserwire position. The laserwire profile of the LINAC4 beam has been measured at all commissioning energies and is found in very good agreement with interpolated profiles from conventional SEM-grid and wire scanner measurements, positioned up and downstream of the laserwire setup. Improvements based on these prototype tests for the design of the final system are presented.

Poster TUPG77 [3.695 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG77

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEBL01

Beam Diagnostics Challenges for Beam Dynamics Studies

emittance, linac, diagnostics, quadrupole

577

O.R. Jones
CERN, Geneva, Switzerland

This presentation will review the performance and limitations of present beam instrumentation in relation to beam dynamics studies, and give an overview of the main requirements from the accelerator physics community for new or improved measurements that need R&D effort from the beam diagnostics side.

Slides WEBL01 [47.201 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEBL01

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPG09

Development of a Prototype Electro-Optic Beam Position Monitor at the CERN SPS

pick-up, polarization, laser, proton

634

A. Arteche, A. Bosco, S.M. Gibson
Royal Holloway, University of London, Surrey, United Kingdom
N. Chritin, D. Draskovic, T. Lefèvre, T.E. Levens
CERN, Geneva, Switzerland

Funding: Project funded by UK STFC grant, ST/N001583/1
A novel electro-optic beam position monitor capable of rapidly (<50ps) monitoring transverse intra-bunch perturbations is under development for the HL-LHC project. The EO-BPM relies on the fast optical response of two pairs of electro-optic crystals, whose birefringence is modified by the passing electric field of a 1ns proton bunch. Analytic models of the electric field are compared with electromagnetic simulations. A preliminary opto-mechanical design of the EO-BPM was manufactured and installed at the CERN SPS in 2016. The prototype is equipped with two pairs of 5mm cubic LiNbO3 crystals, mounted in the horizontal and vertical planes. A polarized CW 780nm laser in the counting room transmits light via 160m of PM fibre to the SPS, where delivery optics directs light through a pair of crystals in the accelerator vacuum. The input polarization state to the crystal can be remotely controlled. The modulated light after the crystal is analyzed, fibre-coupled and recorded by a fast photodetector in the counting room. Following the recent installation, we present the detailed setup and report the latest status on commissioning the device in-situ at the CERN SPS.

Poster WEPG09 [8.441 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG09

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPG49

A High Resolution Single-Shot Longitudinal Profile Diagnostic Using Electro-Optic Transposition

laser, diagnostics, electron, real-time

752

D.A. Walsh, S.P. Jamison, E.W. Snedden
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
T. Lefèvre
CERN, Geneva, Switzerland

Funding: This work was funded by CERN through contract KE1866/DG/CLIC and carried out at STFC Daresbury Laboratory.
Electro-Optic Transposition (EOT) is the basis for an improved longitudinal bunch profile diagnostic we are developing in ASTeC as part of the CLIC UK research program. The scheme consists of transposing the Cou-lomb field profile of an electron bunch into the intensity envelope of an optical pulse via the mixing processes that occur between a CW laser probe and Coulomb field in an electro-optic material. This transposed optical pulse can then be amplified and characterised using robust laser techniques ' in this case chirped pulse optical parametric amplification and frequency resolved optical gating, allowing the Coulomb field to be recovered. EOT is an improvement over existing techniques in terms of the achievable resolution which is limited by the EO material response itself, reduced complexity of the laser system required since nanosecond rather than femtosecond lasers are used, and insensitivity of the system to bunch-laser arrival time jitter due to using a nanosecond long probe. We present results showing the retrieval of a THz pulse (Coulomb field stand-in) which confirms the principle behind the EOT system.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG49

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPG51

A Transverse Deflecting Structure for the Plasma Wakefield Accelerator Experiment, FLASHForward

plasma, emittance, cavity, quadrupole

759

R.T.P. D'Arcy, V. Libov, J. Osterhoff
DESY, Hamburg, Germany

The FLASHForward project at DESY is an innovative plasma-wakefield acceleration experiment, aiming to accelerate electron beams to GeV energies over a few centimeters of ionized gas. These accelerated beams must be of sufficient quality to be used in a free-electron laser; achievable only through rigorous analysis of both the drive- and accelerated-beam's longitudinal phase space. The pulse duration of these accelerated beams is typically in the few femtosecond range, and thus difficult to resolve with traditional diagnostic methods. In order to longitudinally resolve these very short bunch-lengths, it is necessary to utilize the properties of a transverse RF deflector (operating in the hybrid electromagnetic mode, HEM11), which provides a relation between longitudinal and transverse co-ordinates. It is proposed that this type of device, commonly known as a Transverse Deflecting Structure (TDS) due to its 'streaking' in the transverse plane, will be introduced to the FLASHForward beamline in order to perform these single-shot longitudinal phase space measurements. The initial investigations into the realization of this diagnostic tool are outlined.

Poster WEPG51 [10.726 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG51

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPG78

BPM Based Optics Correction of the Solaris 1.5 GeV Storage Ring

storage-ring, closed-orbit, alignment, simulation

836

A. Kisiel, P.B. Borowiec, P.P. Goryl, M.B. Jaglarz, M.P. Kopeć, A.M. Marendziak, S. Piela, P.S. Sagalo, M.J. Stankiewicz, A.I. Wawrzyniak
Solaris, Kraków, Poland

The Solaris is a novel approach for the third generation synchrotron light sources. The machine consists of 600 MeV linear injector and 1.5 GeV storage ring based on 12 compact Double Bend Achromat (DBA) magnets designed in MAX-IV Laboratory in Sweden. After the commissioning phase of the Solaris storage ring the optimization phase has been started along with the commissioning of the first beamline. An essential part of the beam diagnostics and instrumentation system in the storage ring are Beam Position Monitors (BPMs) based on 36 quarter-wave button BPMs spread along the ring. Proper calibration allowed to measure and correct several beam parameters like closed orbit, tune, chromaticity, dispersion and orbit response matrix. The results of the latest machine optimization including the orbit correction, beam-based alignment and BPM phase advance will be presented.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG78

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPG80

Optical Effects in High Resolution and High Dynamic Range Beam Imaging Systems

electron, background, diagnostics, radiation

844

J. Wolfenden, R.B. Fiorito, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom
M. Bergamaschi, R. Kieffer, T. Lefèvre, S. Mazzoni
CERN, Geneva, Switzerland
P. Karataev, K.O. Kruchinin
JAI, Egham, Surrey, United Kingdom

Optical systems are used to transfer light in beam diagnostics for a variety of imaging applications. The effect of the point spread function (PSF) of these optical systems on the resulting measurements is often approximated or misunderstood. It is imperative that the optical PSF is independently characterised, as this can severely impede the attainable resolution of a diagnostic measurement. A high quality laser and specially chosen optics have been used to generate an intense optical point source in order to accomplish such a characterisation. The point source was used to measure the PSFs of various electron-beam imaging systems. These systems incorporate a digital micro-mirror array, which was used to produce very high (>105) dynamic range images. The PSF was measured at each intermediary image plane of the optical system; enabling the origin of any perturbations to the PSF to be isolated and potentially mitigated. One of the characterised systems has been used for optical transition radiation (OTR) measurements of an electron beam at KEK-ATF2 (Tsukuba, Japan).

Poster WEPG80 [1.851 MB]

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reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG80

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