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The Precision Laser Inclinometer
/ Di Girolamo, Beniamino (CERN) ; Boudagov, Julian A (Dubna, JINR) ; Lyablin, Michail V (Dubna, JINR) ; Vlachos, Sotiris (Natl. Tech. U., Athens)
Earth surface movements, like earthquakes or human-produced (cultural) noise, can induce a degradation of the instantaneous luminosity of particle accelerators or even sudden beam losses. In the same way the presence of seismic and cultural noise limits the detection capabilities of interferometric antennas used for the observations of gravitational waves. [...]
JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 3305-3308
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.3305-3308
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Towards the Implementation of Laser Engineered Surface Structures for Electron Cloud Mitigation
/ Sitko, Monika (CERN) ; Abdolvand, Amin (Dundee U.) ; Baglin, Vincent (CERN) ; Bajek, David (Dundee U.) ; Calatroni, Sergio (CERN) ; Chiggiato, Paolo (CERN) ; Colling, Miriam (Daresbury) ; Di Girolamo, Beniamino (CERN) ; Garcia-Tabares Valdivieso, Elisa (CERN) ; Jones, Thomas (Daresbury) et al.
The LHC operation has proven that the electron cloud could be a significant limiting factor in machine performance, in particular for future High Luminosity LHC (HL-LHC) beams. Electron clouds, generated by electron multipacting in the beam pipes, leads to beam instabilities and beam-induced heat load in cryogenic systems. [...]
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-TUZGBE3
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUZGBE3
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4.
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The Monitoring of the Effects of Earth Surface Inclination With the Precision Laser Inclinometer for High Luminosity Colliders
/ Di Girolamo, B (CERN) ; Gayde, J (CERN) ; Mergelkuhl, D (CERN) ; Schaumann, M (CERN) ; Wenninger, J (CERN) ; Azaryan, N S (Dubna, JINR) ; Boudagov, Ju (Dubna, JINR) ; Glagolev, V V (Dubna, JINR) ; Lyablin, M V (Dubna, JINR) ; Shirkov, G (Dubna, JINR) et al.
Earth surface movements, like earthquakes or industrial noise, can induce a degradation of particle accelerator instantaneous luminosity or even sudden beam losses. This report introduces the HL-LHC project and discusses the importance of monitoring the effects of earthquakes on the present LHC beam orbit and luminosity using a novel instrument, the Precision Laser Inclinometer (PLI). [...]
Geneva, Switzerland : JACoW, 2017 - 3 p.
- Published in : 10.18429/JACoW-RuPAC2016-THCBSH04
Fulltext: PDF;
In : 25th Russian Particle Accelerator Conference, Saint Petersburg, Russia, 21 - 25 Nov 2016, pp.THCBSH04
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First Beam Test of Laser Engineered Surface Structures (LESS) at Cryogenic Temperature in CERN SPS Accelerator
/ Salemme, Roberto (CERN ; Euratom, St. Paul Lez Durance) ; Abdolvand, Amin (Dundee U.) ; Baglin, Vincent (CERN) ; Calatroni, Sergio (CERN) ; Chiggiato, Paolo (CERN) ; Di Girolamo, Beniamino (CERN) ; Garcia-Tabares Valdivieso, Elisa (CERN) ; Jenninger, Berthold (CERN) ; Prever-Loiri, Laurent (CERN) ; Sitko, Monika (CERN) et al.
Electron cloud mitigation is an essential requirement for accelerators of positive particles with high intensity beams to guarantee beam stability and limited heat load in cryogenic systems. Laser Engineered Surface Structures (LESS) are being considered, within the High Luminosity upgrade of the LHC collider at CERN (HL-LHC), as an option to reduce the Secondary Electron Yield (SEY) of the surfaces facing the beam, thus suppressing the electron cloud phenomenon. [...]
2018 - 4 p.
- Published in : (2018) , pp. WEPMG005
- Published in : J. Phys.: Conf. Ser. 1067 (2018) 082017
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPMG005
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Determination of the maximum recording frequency by the Precision Laser Inclinometer of an earth surface angular oscillation
/ Azaryan, N (Dubna, JINR) ; Budagov, J (Dubna, JINR) ; Lyablin, M (Dubna, JINR) ; Pluzhnikov, A (Dubna, JINR) ; Di Girolamo, B (CERN) ; Gayde, J Ch (CERN) ; Mergelkuhl, D (CERN)
For the Precision Laser Inclinometer (FPI) using the I-20A oil, a high-frequency 4 Hz boundary was determined for reliable detection of the earth’s surface angular vibrations. The proposed method makes use of the microseismic signal and its processing to expand the PLI working interval for signal reception and allows to record the narrow frequency-band signals originated by the Earth surface angular oscillations caused by industrial sources..
2017 - 10 p.
- Published in : Phys. Part. Nucl. Lett. 14 (2017) 920-929
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Alignment and Monitoring Systems for Accelerators and Experiments Based on BCAM - First Results and Benefits of Systems Developed for ATLAS, LHCb and HIE-ISOLDE
/ Gayde, Jean-Christophe (CERN) ; Blanc, Frederic (Ecole Polytechnique, Lausanne) ; Di Girolamo, Beniamino (CERN) ; Kadi, Yacine (CERN) ; Kautzmann, Guillaume (CERN) ; Klumb, Francis (CERN) ; Lindner, Rolf (CERN) ; Mergelkuhl, Dirk (CERN) ; Pontecorvo, Ludovico (CERN) ; Raymond, Michel (CERN) et al.
In the last few years alignment and monitoring systems based on BCAM* cameras active sensors, or their HBCAM evolution, have been developed at the request of the Technical Coordination of LHC experiments and HIE-ISOLDE facility Project Leader. ADEPO (ATLAS DEtector POsition) has been designed to speed up the precise closure - 0.3 mm - of large detector parts representing in total ~2500 tons. [...]
2018 - 3 p.
- Published in : 10.18429/JACoW-IPAC2018-WEPAF067
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPAF067
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The compensation of the noise due to angular oscillations of the laser beam in the Precision Laser Inclinometer
/ Azaryan, N (Dubna, JINR) ; Budagov, J (Dubna, JINR) ; Lyablin, M (Dubna, JINR) ; Pluzhnikov, A (Dubna, JINR) ; Di Girolamo, B (CERN) ; Gayde, J Ch (CERN) ; Mergelkuhl, D (CERN)
An experimental method for the compensation of the noise originated by the laser ray angular oscillations was proposed and experimentally proved for the Precision Laser Inclinometer (PLI). The PLI noise spectral density was reduced by factor 30× and reached 10$^{–8}$ rad/Hz$^{1/2}$ level at the frequency of 5 × 10$^{–5}$ Hz. [...]
2017 - 9 p.
- Published in : Phys. Part. Nucl. Lett. 14 (2017) 930-938
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The innovative method of high accuracy interferometric calibration of the Precision Laser Inclinometer
/ Azaryan, N (Dubna, JINR) ; Budagov, J (Dubna, JINR) ; Gayde, J -Ch (CERN ; Ecole Polytechnique, Lausanne) ; Girolamo, B (CERN ; Ecole Polytechnique, Lausanne) ; Glagolev, V (Dubna, JINR) ; Lyablin, M (Dubna, JINR) ; Mergelkuhl, D (CERN ; Ecole Polytechnique, Lausanne) ; Shirkov, G (Dubna, JINR)
In this report a high accuracy method for an interferometric calibration of the Precision Laser Inclinometer (PLI) is proposed. The method is based on the simultaneous measurement of: (a) the PLI base calibration slope (angle), set by a piezoelectric positioner, via laser interferometry and (b) the PLI response signal. [...]
2017 - 11 p.
- Published in : Phys. Part. Nucl. Lett. 14 (2017) 112-122
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The temperature stability of 0.005°C for the concrete floor in the CERN Transfer Tunnel #1 hosting the Precision Laser Inclinometer
/ Azaryan, N (Dubna, JINR) ; Budagov, J (Dubna, JINR) ; Lyablin, M (Dubna, JINR) ; Pluzhnikov, A (Dubna, JINR) ; Gayde, J Ch (CERN) ; Di Girolamo, B (CERN) ; Mergelkuhl, D (CERN)
To reach a sensitivity level of ~10$^{–9}$ rad for the Precision Laser Inclinometer (PLI) for the registration of the Earth surface angular oscillation in the low frequency band of [10$^{–6}$ Hz, 1 Hz] the temperature stability of the CERN Transfer Tunnel #1 has been investigated. The daily temperature variation was 0.082°C for the air and 0.005°C for the concrete floor. [...]
2017 - 7 p.
- Published in : Phys. Part. Nucl. Lett. 14 (2017) 913-919
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