CERN Accelerating science

Accelerator Physics

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2020-02-22
07:03
Calibration of Fourier domain short coherence interferometer for absolute distance measurements / Montonen, R (Helsinki Inst. of Phys. ; Helsinki U.) ; Kassamakov, I (Helsinki Inst. of Phys. ; Helsinki U.) ; Hæggström, E (Helsinki U.) ; Österberg, K (Helsinki Inst. of Phys. ; Helsinki U.)
We calibrated and determined the measurement uncertainty of a custom-made Fourier domain short coherence interferometer operated in laboratory conditions. We compared the optical thickness of two thickness standards and three coverslips determined with our interferometer to the geometric thickness determined by SEM. [...]
OSA, 2015 - 5 p. - Published in : Appl. Opt. 54 (2015) 4635

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2020-02-18
12:10
MD4944: Local linear coupling measurement at the IPs / Persson, Tobias Hakan Bjorn (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Hofer, Michael (Vienna University of Technology (AT)) ; Maclean, Ewen Hamish (University of Malta (MT)) ; Tomas Garcia, Rogelio (CERN) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES))
It was observed that a large local linear coupling around IP2 reduced the luminosity during the 2018 ion run. [...]
CERN-ACC-NOTE-2020-0013.
- 2020. - 9 p.

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2020-02-14
14:15
Cover not available Diagnostics of short electron bunches with THz detectors in particle accelerators / Steinmann, Johannes Leonhard
Several novel diagnostic systems based on the detection of coherent THz radiation are presented [...]
Karlsruhe : KIT Scientific Publishing, 2019. - 226 p.
Purchase it for me! - CERN library copies
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2020-02-14
07:40
A Comparative Study of Radiation-Tolerant Fiber Optic Sensors for Relative Humidity Monitoring in High-Radiation Environments at CERN / Berruti, G (CERN ; Sannio U.) ; Consales, M (Sannio U.) ; Borriello, A (CNR, IMCB) ; Giordano, M (CNR, IMCB) ; Buontempo, S (INFN, Naples) ; Makovec, A (Debrecen U.) ; Breglio, G (U. Naples (main)) ; Petagna, P (CERN) ; Cusano, A (Sannio U.)
In this paper, we report a comparative study of fiber optic sensors for applications of relative humidity (RH) monitoring in high-radiation environments. [...]
2014. - 15 p.

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2020-02-13
08:12
Proton-Beam-Driven Plasma Acceleration / Adli, Erik (Oslo U.) ; Muggli, Patric (Munich, Max Planck Inst.)
We describe the main ideas, promises and challenges related to proton-driven plasma wakefield acceleration. Existing high-energy proton beams have the potential to accelerate electron beams to the TeV scale in a single plasma stage. [...]
WS, 2016 - 20 p. - Published in : Rev. Accel. Sci. Technol. 09 (2016) 85-104 Published fulltext: PDF;

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2020-02-04
08:14
First Operation for Stochastic Cooling of P-Bars in the CERN AD Using Optical Delay Notch Filter and Plans 2021 Operation / Höfle, Wolfgang (CERN) ; Arnaudon, Luca (CERN) ; Bjørsvik, Endre (CERN) ; Caspers, Fritz (CERN) ; Eriksson, Tommy (CERN) ; Louwerse, Reinier (CERN) ; Myklebust, Vebjorn Roed (CERN)
As part of the consolidation of the stochastic coolingsystem of the CERN Antiproton Decelerator a notch filter with optical delay lines has been developed. During the 2018 run of AD a notch filter with optical delay lines for the longitudinal stochastic cooling at 3.5 GeV/c was successfully tested with beam for the first time. [...]
2019 - 5 p. - Published in : 10.18429/JACoW-COOL2019-MOY01 Fulltext: 10.18429_JACoW-COOL2019-MOY01 - PDF; moy01 - PDF;
In : International Workshop on Beam Cooling and Related Topics, Novosibirsk, Russian Federation, September 23 - 27, 2019, pp.MOY01

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2020-02-01
04:22
Electron Beam Characterization with Beam Loss Monitors in AWAKE / Verra, L. (CERN ; Munich, Max Planck Inst. ; Munich, Tech. U.) ; Turner, M. (CERN) ; Gessner, S. (CERN) ; Gschwendtner, E. (CERN) ; Velotti, F. (CERN) ; Muggli, P. (Munich, Max Planck Inst.)
We present a method to measure transverse size and position of an electron or proton beam, close to the injection point in plasma wakefields, where other diagnostics are not available. [...]
arXiv:1912.05009.
- 5 p.
Fulltext

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2020-01-31
06:17
Noninvasive Micrometer-Scale Particle-Beam Size Measurement Using Optical Diffraction Radiation in the Ultraviolet Wavelength Range / Bergamaschi, M (CERN ; Royal Holloway, U. of London) ; Aryshev, A (KEK, Tsukuba) ; Karataev, P (Royal Holloway, U. of London) ; Kieffer, R (CERN ; Royal Holloway, U. of London) ; Lefevre, T (CERN) ; Mazzoni, S (CERN) ; Terunuma, N (KEK, Tsukuba) ; Yang, R (LPGP, Orsay)
We present recent achievements in the application of optical diffraction radiation (ODR) to the measurement of the transverse beam size of a 1.3 GeV micrometer-size electron beam performed with an instrument installed in the extended extraction line of the KEK Accelerator Test Facility. ODR is a recent technique for the measurement of the transverse size and emittance of highly relativistic particle beams. [...]
2020 - 13 p. - Published in : Phys. Rev. Applied 13 (2020) 014041 Fulltext: PDF;

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2020-01-25
10:34
Sub-micron scale transverse electron beam size diagnostics methodology based on the analysis of optical transition radiation source distribution / Aryshev, A (KEK, Tsukuba) ; Ainsworth, R (Royal Holloway, U. of London) ; Aumeyr, T (Royal Holloway, U. of London) ; Bergamaschi, M (Royal Holloway, U. of London) ; Boogert, S T (Royal Holloway, U. of London) ; Karataev, P (Royal Holloway, U. of London) ; Kieffer, R (CERN) ; Kruchinin, K (Royal Holloway, U. of London) ; Lefevre, T (CERN) ; Mazzoni, S (CERN) et al.
Optical Transition Radiation (OTR) appearing when a charged particle crosses a boundary between two media with different dielectric properties has widely been used as a tool for transverse profile measurements of charged particle beams in numerous facilities worldwide. The resolution of the conventional monitors is defined by the dimensions of the Point Spread Function (PSF) distribution, i.e. [...]
2020 - 18 p. - Published in : JINST 15 (2020) P01020 Fulltext: PDF;

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2020-01-25
10:34
Source of horizontal instability at the CERN Proton Synchrotron Booster / Koukovini-Platia, E (CERN) ; Barnes, M J (CERN) ; Bartosik, H (CERN) ; Rumolo, G (CERN) ; Sermeus, L (CERN) ; Zannini, C (CERN)
The CERN Proton Synchrotron Booster (PSB) has been known to suffer from horizontal instabilities since its early operation in the 1970s. These instabilities appear at specific beam energies and range of working points. [...]
2020 - 16 p. - Published in : Phys. Rev. Accel. Beams 22 (2020) 124201 Fulltext: PDF;

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