HB2012 - List of Keywords (diagnostics)

Paper	Title	Other Keywords	Page
MOP247	Beam Stability and Tail Population at SPS Scrapers	emittance, injection, extraction, controls	166
	L.N. Drøsdal, K. Cornelis, B. Goddard, V. Kain, M. Meddahi, O. Mete, B. Mikulec, E. Veyrunes CERN, Geneva, Switzerland
	Before injection into the LHC the beams are scraped in the SPS to remove the tails of the transverse particle distributions. Without scraping the tail population is large enough to create losses above the beam abort thresholds of the LHC beam loss monitor system when injecting. The scrapers are only effective if correctly set up. This paper shows the results of periodical scraper scans. The beam position and beam size at the scraper is changing with time. The scraper settings hence need to follow accordingly. The scans also give insight into the transverse tail population and could therefore provide useful beam quality diagnostics. The impact on new scraper designs and setting up strategy are discussed.

MOP254	Design of a Photo-detachment Emittance Instrument for FETS	laser, dipole, emittance, simulation	192
	C. Gabor STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom G.E. Boorman, A. Bosco Royal Holloway, University of London, Surrey, United Kingdom A.P. Letchford STFC/RAL, Chilton, Didcot, Oxon, United Kingdom P. Savage Imperial College of Science and Technology, Department of Physics, London, United Kingdom
	Photo detachment is a possibility to diagnose non-destructively H⁻ ion beams. For emittance measurements, the produced neutrals are more suitable then the photo-detached electrons. Such a Photo-Detachment Emittance Measurement Instrument (PD-EMI) is planned for the Front End Test Stand (FETS) at Rutherford Appleton Laboratory (RAL/ UK). FETS comprises a Penning ion source of 60 mA beam current with up to 2 ms pulse length at 50pps, a Low Energy Beam Transport (LEBT), a four-vane RFQ with 3 MeV and a Medium Energy Beam Transport (MEBT) with a chopper system. The PD-EMI will be integrated at the end of the MEBT to commission the RFQ which is currently under construction. The introduction gives an overview some results reached so far and explains the conceptual design. Beam simulations show how to implement this to the MEBT being under construction. The remaining paper concentrates then on the hardware which is the dipole magnet, the laser and optics. The design and and engineering of the magnet chamber needs special attention to both satisfy beam transportation and diagnostics purpose. First measurements about the laser and its parameters will be presented.

MOP260	Beam Halo Measurements using Adaptive Masking Methods and Proposed Recent Halo Experiment	quadrupole, injection, space-charge, simulation	215
	H.D. Zhang, B.L. Beaudoin, S. Bernal, R.B. Fiorito, R.A. Kishek, K. Řežaei, A.G. Shkvarunets UMD, College Park, Maryland, USA
	Beam halo is a common phenomenon in particle beams, especially for modern, advanced accelerators where high beam intensities lead to strong space charge. Halo is generally understood as a population of particles that do, or will, reach large transverse radii relative to a more intense, centralized beam core. It is associated with emittance growth, beam quality degradation and particle loss. The particle-core model [1] is commonly used to describe halo formation as the result of a parametric resonance due to envelope mismatch. Few experiments have been carried out to test this theory [2]. Measurement of beam halo is particularly problematic for faint halos, where light from the intense core obscures the optical image of the halo. In this paper, we present a new diagnostic for high-dynamic range halo measurements based on adaptive masking of the beam core [3]. We also present the design of an experiment to study halo formation from envelope mismatch for beams spanning a wide range of intensities on the University of Maryland Electron Ring (UMER) [4]. [1] R. Gluckstern, Phys. Rev. Lett., vol.73, 1994. [2] C. Allen, Phys. Rev. Lett. Vol 89, 1998 [3] H. Zhang, et al., Proc of PAC11. [4] R.A. Kishek, these proceedings.

TUO3B03	Linac4 Beam Commissioning Strategy	emittance, linac, space-charge, DTL	283
	J.-B. Lallement, A.M. Lombardi, P.A. Posocco CERN, Geneva, Switzerland
	Linac4 is a 160 MeV H⁻ ion linear accelerator, presently under construction, which will replace the 50 MeV Linac2 as injector of the CERN proton complex. Linac4 is a 90 m long normal-conducting Linac made of a 3 MeV Radio Frequency Quadrupole (RFQ) followed by a 50 MeV Drift Tube Linac (DTL), a 100 MeV Cell-Coupled Drift Tube Linac (CCDTL) and a Pi-Mode Structure (PIMS). Starting in 2013, five commissioning stages, interlaced with installation periods, are foreseen at the energies of 3, 12, 50, 100 and 160 MeV. In addition to the diagnostics permanently installed in the Linac, temporary measurement benches will be located at the end of each structure and will be used for beam commissioning. Comprehensive beam dynamics simulations were carried out through the Linac and the diagnostic benches to define a commissioning procedure, which is summarised in this paper. In particular, we will present a method for emittance reconstruction from profile measurements which keeps into account the effects of space charge and finite diagnostics resolution.
	Slides TUO3B03 [2.951 MB]

TUO1C03	The Beam Diagnostics of CSNS	emittance, linac, injection, neutron	302
	T.G. Xu, J.N. Bai, C. Chen, L.X. Han, F. Li, P. Li, M. Meng, J.L. Sun, J.M. Tian, A.X. Wang, B. Wang, M.H. Xu, Zh.H. Xu, X.Y. Yang, L. Zeng IHEP, Beijing, People's Republic of China
	CSNS project is in the construction stage. The overview of CSNS beam diagnostics is presented which includes linac, RCS and both transport beam line. also some predevelopment of CSNS beam diagnostics is presented.
	Slides TUO1C03 [8.366 MB]

WEO3B03	PXIE at FNAL	rfq, cavity, kicker, ion	414
	N. Solyak, C.M. Baffes, A.Z. Chen, Y.I. Eidelman, B.M. Hanna, S.D. Holmes, V.A. Lebedev, S. Nagaitsev, J.-F. Ostiguy, R.J. Pasquinelli, D.W. Peterson, L.R. Prost, G.W. Saewert, A. Saini, V.E. Scarpine, A.V. Shemyakin, D. Sun, V.P. Yakovlev Fermilab, Batavia, USA
	PXIE is the integrated systems test for the Project X frontend. It is expected to accelerate 1-2 mA CW beam up to 30 MeV. The major goal of the project is a validation of the Project X concept and elimination of technical risks. It is expected to be constructed in the period of 2012-2016. In presentation the conceptual design of the experimental test facility, lattice and beam dynamics studies will be discussed in details.
	Slides WEO3B03 [4.561 MB]

THO3C06	On-line Calibration Schemes for RF-based Beam Diagnostics	pick-up, resonance, target, proton	601
	P.-A. Duperrex, U. Müller PSI, Villigen PSI, Switzerland
	RF-based beam diagnostics such as BPMs and beam current monitors rely on precise RF signal measurements. Temperature drifts and differences in the overall measurement chain gain make such measurements very challenging and calibration validity over time is an issue. Over some years, on-line calibration schemes for BPMs and current monitors have been developed. These innovative schemes are based on the use of a pilot signal at a frequency offset from the measurement frequency. Results, advantages and disadvantages of such schemes are discussed.
	Slides THO3C06 [2.742 MB]

FRO1B02	Qinclosing Plenary Summary of Working Group E:Diagnostics and Instrumentation for High-Intensity Beams	beam-losses, linac, instrumentation, proton	625
	R. Dölling PSI, Villigen PSI, Switzerland N. Hayashi JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan V.E. Scarpine Fermilab, Batavia, USA
	Working Group E Summary: Working group E was charged with presentations and discussions on diagnostics and instrumentation of high intensity beams. We had 2 sessions, consisting of a total of 12 talks, each of 20 minutes for presentation followed by some discussion. One session was followed by a discussion session of two hours. All sessions took place in parallel with the sessions of WG-D (Commissioning, operations and performance), inevitably preventing some possibly useful overlap. In addition, seven posters, regarding beam diagnostics, were presented in the single poster session.
	Slides FRO1B02 [18.507 MB]

Paper

Title

Other Keywords

Page

MOP247

Beam Stability and Tail Population at SPS Scrapers

emittance, injection, extraction, controls

166

L.N. Drøsdal, K. Cornelis, B. Goddard, V. Kain, M. Meddahi, O. Mete, B. Mikulec, E. Veyrunes
CERN, Geneva, Switzerland

Before injection into the LHC the beams are scraped in the SPS to remove the tails of the transverse particle distributions. Without scraping the tail population is large enough to create losses above the beam abort thresholds of the LHC beam loss monitor system when injecting. The scrapers are only effective if correctly set up. This paper shows the results of periodical scraper scans. The beam position and beam size at the scraper is changing with time. The scraper settings hence need to follow accordingly. The scans also give insight into the transverse tail population and could therefore provide useful beam quality diagnostics. The impact on new scraper designs and setting up strategy are discussed.

MOP254

Design of a Photo-detachment Emittance Instrument for FETS

laser, dipole, emittance, simulation

192

C. Gabor
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
G.E. Boorman, A. Bosco
Royal Holloway, University of London, Surrey, United Kingdom
A.P. Letchford
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
P. Savage
Imperial College of Science and Technology, Department of Physics, London, United Kingdom

Photo detachment is a possibility to diagnose non-destructively H⁻ ion beams. For emittance measurements, the produced neutrals are more suitable then the photo-detached electrons. Such a Photo-Detachment Emittance Measurement Instrument (PD-EMI) is planned for the Front End Test Stand (FETS) at Rutherford Appleton Laboratory (RAL/ UK). FETS comprises a Penning ion source of 60 mA beam current with up to 2 ms pulse length at 50pps, a Low Energy Beam Transport (LEBT), a four-vane RFQ with 3 MeV and a Medium Energy Beam Transport (MEBT) with a chopper system. The PD-EMI will be integrated at the end of the MEBT to commission the RFQ which is currently under construction. The introduction gives an overview some results reached so far and explains the conceptual design. Beam simulations show how to implement this to the MEBT being under construction. The remaining paper concentrates then on the hardware which is the dipole magnet, the laser and optics. The design and and engineering of the magnet chamber needs special attention to both satisfy beam transportation and diagnostics purpose. First measurements about the laser and its parameters will be presented.

MOP260

Beam Halo Measurements using Adaptive Masking Methods and Proposed Recent Halo Experiment

quadrupole, injection, space-charge, simulation

215

H.D. Zhang, B.L. Beaudoin, S. Bernal, R.B. Fiorito, R.A. Kishek, K. Řežaei, A.G. Shkvarunets
UMD, College Park, Maryland, USA

Beam halo is a common phenomenon in particle beams, especially for modern, advanced accelerators where high beam intensities lead to strong space charge. Halo is generally understood as a population of particles that do, or will, reach large transverse radii relative to a more intense, centralized beam core. It is associated with emittance growth, beam quality degradation and particle loss. The particle-core model [1] is commonly used to describe halo formation as the result of a parametric resonance due to envelope mismatch. Few experiments have been carried out to test this theory [2]. Measurement of beam halo is particularly problematic for faint halos, where light from the intense core obscures the optical image of the halo. In this paper, we present a new diagnostic for high-dynamic range halo measurements based on adaptive masking of the beam core [3]. We also present the design of an experiment to study halo formation from envelope mismatch for beams spanning a wide range of intensities on the University of Maryland Electron Ring (UMER) [4].
[1] R. Gluckstern, Phys. Rev. Lett., vol.73, 1994.
[2] C. Allen, Phys. Rev. Lett. Vol 89, 1998
[3] H. Zhang, et al., Proc of PAC11.
[4] R.A. Kishek, these proceedings.

TUO3B03

Linac4 Beam Commissioning Strategy

emittance, linac, space-charge, DTL

283

J.-B. Lallement, A.M. Lombardi, P.A. Posocco
CERN, Geneva, Switzerland

Linac4 is a 160 MeV H⁻ ion linear accelerator, presently under construction, which will replace the 50 MeV Linac2 as injector of the CERN proton complex. Linac4 is a 90 m long normal-conducting Linac made of a 3 MeV Radio Frequency Quadrupole (RFQ) followed by a 50 MeV Drift Tube Linac (DTL), a 100 MeV Cell-Coupled Drift Tube Linac (CCDTL) and a Pi-Mode Structure (PIMS). Starting in 2013, five commissioning stages, interlaced with installation periods, are foreseen at the energies of 3, 12, 50, 100 and 160 MeV. In addition to the diagnostics permanently installed in the Linac, temporary measurement benches will be located at the end of each structure and will be used for beam commissioning. Comprehensive beam dynamics simulations were carried out through the Linac and the diagnostic benches to define a commissioning procedure, which is summarised in this paper. In particular, we will present a method for emittance reconstruction from profile measurements which keeps into account the effects of space charge and finite diagnostics resolution.

Slides TUO3B03 [2.951 MB]

TUO1C03

The Beam Diagnostics of CSNS

emittance, linac, injection, neutron

302

T.G. Xu, J.N. Bai, C. Chen, L.X. Han, F. Li, P. Li, M. Meng, J.L. Sun, J.M. Tian, A.X. Wang, B. Wang, M.H. Xu, Zh.H. Xu, X.Y. Yang, L. Zeng
IHEP, Beijing, People's Republic of China

CSNS project is in the construction stage. The overview of CSNS beam diagnostics is presented which includes linac, RCS and both transport beam line. also some predevelopment of CSNS beam diagnostics is presented.

Slides TUO1C03 [8.366 MB]

WEO3B03

PXIE at FNAL

rfq, cavity, kicker, ion

414

N. Solyak, C.M. Baffes, A.Z. Chen, Y.I. Eidelman, B.M. Hanna, S.D. Holmes, V.A. Lebedev, S. Nagaitsev, J.-F. Ostiguy, R.J. Pasquinelli, D.W. Peterson, L.R. Prost, G.W. Saewert, A. Saini, V.E. Scarpine, A.V. Shemyakin, D. Sun, V.P. Yakovlev
Fermilab, Batavia, USA

PXIE is the integrated systems test for the Project X frontend. It is expected to accelerate 1-2 mA CW beam up to 30 MeV. The major goal of the project is a validation of the Project X concept and elimination of technical risks. It is expected to be constructed in the period of 2012-2016. In presentation the conceptual design of the experimental test facility, lattice and beam dynamics studies will be discussed in details.

Slides WEO3B03 [4.561 MB]

THO3C06

On-line Calibration Schemes for RF-based Beam Diagnostics

pick-up, resonance, target, proton

601

P.-A. Duperrex, U. Müller
PSI, Villigen PSI, Switzerland

RF-based beam diagnostics such as BPMs and beam current monitors rely on precise RF signal measurements. Temperature drifts and differences in the overall measurement chain gain make such measurements very challenging and calibration validity over time is an issue. Over some years, on-line calibration schemes for BPMs and current monitors have been developed. These innovative schemes are based on the use of a pilot signal at a frequency offset from the measurement frequency. Results, advantages and disadvantages of such schemes are discussed.

Slides THO3C06 [2.742 MB]

FRO1B02

Qinclosing Plenary Summary of Working Group E:Diagnostics and Instrumentation for High-Intensity Beams

beam-losses, linac, instrumentation, proton

625

R. Dölling
PSI, Villigen PSI, Switzerland
N. Hayashi
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
V.E. Scarpine
Fermilab, Batavia, USA

Working Group E Summary: Working group E was charged with presentations and discussions on diagnostics and instrumentation of high intensity beams. We had 2 sessions, consisting of a total of 12 talks, each of 20 minutes for presentation followed by some discussion. One session was followed by a discussion session of two hours. All sessions took place in parallel with the sessions of WG-D (Commissioning, operations and performance), inevitably preventing some possibly useful overlap. In addition, seven posters, regarding beam diagnostics, were presented in the single poster session.

Slides FRO1B02 [18.507 MB]