Today a regular seminar was held at the Department of Multiple Hadron Processes.Grach Torosyan spoke about the first results of observing microseismic phenomena with the Precision Laser Inclinometer at the Garni International Geophysical Observatory (Armenia).
Manufacture of all parts for two professional inclinometers has been accomplished at the DLNP Workshop. The next stage is assembly and commissioning of the inclinometers at CERN. By the end of the year, the DLNP scientists will supply five of these new instruments to CERN and put them into operation. The work is carried out at the Department of Multiple Hadronic Processes under the leadership of Prof. J. Budagov within the JINR–CERN agreement and is aimed at stabilizing spatial positions of beams for increasing the LHC luminosity.
The high-precision instrument of the new generation, Precision Laser Inclinometer, makes it possible to monitor angular oscillations of the Earth in two orthogonal directions in the range of 10-6–4 Hz with a maximum sensitivity of 2.4∙10-11 rad/Hz1/2. It reliably detects angular inclinations of the Earth surface caused by the Moon, the Sun, distant (over 104 km away) earthquakes, the microseismic peak, and industrial sources.
At the session of the DLNP Science and Technology Council held on 15 March 2018 a decision was made to prolong the project “Precision laser metrology for accelerators and detector complexes” for the period of 2019–2021. The authors of the project achieved record parameters of the measuring complex developed for metrological support of modern colliders and large detector complexes.
In the first section of the project it is proposed to create a NETWORK of six JINR Precision Laser Inclinometers for visualizing variations in the landscape under the effect of the propagating surface seismic waves. The resulting data on the deformation of the Earth surface will be used by the feedback control system to correct online the operating parameters of the collider and stabilize spatial positions of the beam focuses in the collision zone.
The JINR has created the high precision new generation instrument the Precision Laser Inclinometer made possible to monitor the Earth surface angular oscillations in two orthogonal directions in 10-6 – 4 Hz frequency band with maximal sensitivity of 2.4∙10-11 rad/Hz1/2. This new instrument steadily registers Earth surface inclinations caused by the Moon, Sun, far located (above 104 km) earthquakes, microseismic peak and industrial origin sources (Figure 1). The inclinometer application for stabilization of spatial location of LHC beams in first-priority CERN program “High-Luminosity LHC” is under intense consideration.
Figure 1: Data, registered by PLI installed in CERN
In 2017 there were created the two first units of fundamentally new instrument – the Professional Precision Laser Inclinometer (PPLI, Figure 2).Completely assembled and tested in JINR, Dubna, two PPLI have been sent to CERN (Switzerland) and Garni Seismic Observatory (Armenia) for the adjustment and overall testing. Technical documentation about the commissioning of first PPLI in the TT1 have been included in the CERN official database as authorship of DLNP scientists. The new instrument appearance has been mentioned on the CERN-Russia Meeting in October 2017.
Figure 2: Professional PLI commissioned in CERN
JINR and CERN Directorates signed the Acceptance act, which completes the development stage of PPLI for the CERN tasks. An Agreement for the production and maintenance of additional five PPLIs, for the creation of a future PPLI Network in the Large Hadron Collider area, has been prepared for signing by the JINR and CERN Directorates.
An agreement between JINR and Garni Geophysical Observatory (GGO, Garni, Armenia) has been concluded, according to which the PPLI made in JINR sent to Garni and commissioned in the GGO tunnel for the collaborative study of the application of PLI for the seismic activity registration.
An agreement between JINR and Shirak Technologies (Yerevan, Armenia) has been concluded on the joint development of specialized software for PPLI and its distributed network as well as to equip the PPLI with a specialized control electronics.
The new specialized research laboratory for laser metrology is being created in DLNP with the decisive help and financial support of the Directorate of Dzhelepov Laboratory. Most of the equipment for future Lab is already purchased. Nowadays the finishing civil constructing in the laboratory room in the progress.
The works on the second stage of the project - the Absolute Distance Meter – have been started. Up to date, assembly of 5 meters long prototype was begun in the existing thermoisolated laboratory. The main part of the research will carry out in the future Metrology laboratory.
In total for the year 2017, fourteen papers on the high precision metrology have been prepared, reported and published by our group. The JINR contribution to the study of the possible application of the PLI Network in the HL-LHC program on the ATLAS spectrometer have been noted in the report of Frederick Bordry at the CERN-JINR and Russia-CERN Committee Meetings in October 2017.
Reports and seminars:
1. M. Lyablin, «The frequency range expansion of the highly sensitive application of the Precision Laser Inclinometer », Scientific-methodical seminar of DLNP, 24.01.2017, Dubna.
2. N. Azaryan, «The use of 24-bit Data Translation for the Precision Laser Inclinometer: Methods for minimizing noise and compensating for the channels desynchronization», Scientific-methodical seminar of DLNP, 24.01.2017, Dubna.
3. M. Lyablin, «Observation of the 2-D Earth surface angular deformations by the Moon and Sun by the Precision Laser Inclinometer», CLIC workshop 2017, 06.03.2017, Geneve.
4. M. Lyablin and J. Budagov, «Observation of the 2D Earth surface angular deformations by the Moon and Sun with the Precision Laser Inclinometer», 25th anniversary of JINR in ATLAS, 24-29.04.2017, Becici, Budva.
5. A. Pluzhnikov, «The minimization of the long term noises of the 24 bits ADC for the Precision Laser Inclinometer», Conference of Young Scientists and Specialists of JINR, 14.06.2017, Alushta.
6. M. Lyablin, «Professional PLI commissioning in GGO Tunnel», Work Meeting, 12.09.2017, Yerevan.
7. N. Azaryan, «Professional PLI commissioning in TT1@CERN», SU Tech. Meetings, 27.09.2017, Geneve.
8. B. Di Girolamo, «Status and Perspectives from in-kind contributions. Status of JINR-CERN», HL‑LHC Annual Meeting – Collaboration Board, Madrid, 13.11.2017
9. N. Azaryan, «The software of Professional Precision Laser Inclinometers», Work meeting, 14.11.2017, Yerevan.
1. N. Azaryan, J. Budagov, J‑Ch. Gayde, B. Di Girolamo, V. Glagolev, M. Lyablin, D. Mergelkuhl, G. Shirkov, “The Innovative Method of High Accuracy Interferometric Calibration of the Precision Laser Inclinometer”, Physics of Particles and Nuclei Letters, Vol. 14, No. 1, 2017, p. 112
2. N. Azaryan, V. Batusov, J. Budagov, V. Glagolev, M. Lyablin, G. Trubnikov, G. Shirkov, J.‑Ch. Gayde, B. Di Girolamo, A. Herty, H. Mainaud Durand, D. Mergelkuhl V. Rude, “Comparative Analysis of Earthquakes Data Recorded by the Innovative Precision Laser Inclinometer Instruments and the Classic Hydrostatic Level System”, Physics of Particles and Nuclei Letters, Vol. 14, No. 3, 2017, p. 480
3. N. Azaryan, J. Budagov, J‑Ch. Gayde, B. Di Girolamo, M. Lyablin, D. Mergelkuhl, A. Pluzhnikov, “Determination of the maximum recording frequency by the Precision Laser Inclinometer of an Earth surface angular oscillation”, Physics of Particles and Nuclei Letters, Vol. 14, No. 6, 2017, p.920
4. N. Azaryan, J. Budagov, J‑Ch. Gayde, B. Di Girolamo, M. Lyablin, D. Mergelkuhl, A. Pluzhnikov, “The compensation of the noise due to angular oscillations of the laser beam in the Precision Laser Inclinometer”, Physics of Particles and Nuclei Letters, Vol. 14, No. 6, 2017, p.930
5. N. Azaryan, J. Budagov, J‑Ch. Gayde, B. Di Girolamo, M. Lyablin, D. Mergelkuhl, A. Pluzhnikov, “The temperature stability of 0.005°C for the concrete floor in the CERN Transfer Tunnel #1 hosting the Precision Laser Inclinometer”, Physics of Particles and Nuclei Letters, Vol. 14, No. 6, 2017, p.913
An article about the first estimation of the impact of angular microseisms on the dynamics of the displacement of the beam focuses in the collision area is under preparation to be published.
For 2016 there were reached the significant improvements of the Precision Laser Inclinometer (PLI) created in DLNP. The PLI registers angular oscillations in 5∙10‑6 ‑ 5 Hz band with resolution of 10‑8 ‑ 10‑10 rad/Hz1/2 respectively. The Earth's surface angular oscillations caused by the gravity influence of Moon and Sun have been registered in two azimuthally-orthogonal vertical planes. Following JINR-CERN Agreement two professional PLIs have been created for the quantitative study of the possibility of PLI-Network use in the Large Hadron Collider luminosity increasing program.
Measured angular oscillations of Earth surface evoked by the Moon and Sun gravity influence
The full version of the Report see in "Project Documents"