We describe the behavior of a beam balance used for the measurement of small forces, in macroscopic samples, in tens of mHz frequency band. The balance, which works at room temperature, is the prototype of the cryogenic balance of the Archimedes experiment, aimed at measuring the interaction between electromagnetic vacuum fluctuations and the gravitational field. The balance described has a 50-cm aluminum arm and suspends an aluminum sample of 0.2 Kg and a lead counterweight. The read-out is interferometric, and the balance works in closed loop. It is installed in the low seismic noise laboratory of SAR-GRAV (Sardinia—Italy). Thanks to the low sensing and actuation noise and finally thanks to the low environmental noise, the sensitivity in torque τn~ is about τn~≈2∗10-12Nm/Hz at 10 mHz and reaches a minimum of about τn~≈7∗10-13Nm/Hz at tens of mHz, corresponding to the force sensitivity Fn~ of Fn~≈3∗10-12N/Hz. The achievement of this sensitivity, which turns out to be compatible with thermal noise estimation, on the one hand, demonstrates the correctness of the optical and mechanical design and on the other paves the way to the completion of the final balance. Furthermore, since the balance is equipped with weight and counterweight made of different materials, it is sensitive to the interaction with dark B-L photons. A first very short run made to evaluate constraints on B-L dark photon coupling shows encouraging results that will be discussed in view of next future scientific runs.

Thermal noise-limited beam balance as prototype of the Archimedes vacuum weight experiment and B-L dark photon search / Allocca, Annalisa; Avino, Saverio; Calloni, Enrico; Caprara, Sergio; Carpinelli, Massimo; Contu, Andrea; D'Onofrio, Luca; D'Urso, Domenico; De Rosa, Rosario; Errico, L.; Esposito, Marina; Gagliardi, Gianluca; Grilli, Marco; Mangano, Valentina; Marsella, Maria; Naticchioni, Luca; Pasqualetti, Antonio; Pepe, Gianpiero; Perciballi, Maurizio; Puppo, Paola; Rapagnani, Piero; Ricci, Fulvio; Rosa, Luigi; Rovelli, Carlo; Rozza, Davide; Ruggi, Paolo; Saini, Naurang L.; Sequino, Valeria; Sipala, Valeria; Stornaiuolo, Daniela; Tafuri, Francesco; Trozzo, Lucia. - In: THE EUROPEAN PHYSICAL JOURNAL PLUS. - ISSN 2190-5444. - 139:2(2024). [10.1140/epjp/s13360-024-04920-x]

Thermal noise-limited beam balance as prototype of the Archimedes vacuum weight experiment and B-L dark photon search

Allocca, Annalisa;Avino, Saverio;Calloni, Enrico;D'Onofrio, Luca;D'Urso, Domenico;De Rosa, Rosario;Errico, L.;Esposito, Marina;Rosa, Luigi;Sequino, Valeria;Stornaiuolo, Daniela;Tafuri, Francesco;
2024

Abstract

We describe the behavior of a beam balance used for the measurement of small forces, in macroscopic samples, in tens of mHz frequency band. The balance, which works at room temperature, is the prototype of the cryogenic balance of the Archimedes experiment, aimed at measuring the interaction between electromagnetic vacuum fluctuations and the gravitational field. The balance described has a 50-cm aluminum arm and suspends an aluminum sample of 0.2 Kg and a lead counterweight. The read-out is interferometric, and the balance works in closed loop. It is installed in the low seismic noise laboratory of SAR-GRAV (Sardinia—Italy). Thanks to the low sensing and actuation noise and finally thanks to the low environmental noise, the sensitivity in torque τn~ is about τn~≈2∗10-12Nm/Hz at 10 mHz and reaches a minimum of about τn~≈7∗10-13Nm/Hz at tens of mHz, corresponding to the force sensitivity Fn~ of Fn~≈3∗10-12N/Hz. The achievement of this sensitivity, which turns out to be compatible with thermal noise estimation, on the one hand, demonstrates the correctness of the optical and mechanical design and on the other paves the way to the completion of the final balance. Furthermore, since the balance is equipped with weight and counterweight made of different materials, it is sensitive to the interaction with dark B-L photons. A first very short run made to evaluate constraints on B-L dark photon coupling shows encouraging results that will be discussed in view of next future scientific runs.
2024
Thermal noise-limited beam balance as prototype of the Archimedes vacuum weight experiment and B-L dark photon search / Allocca, Annalisa; Avino, Saverio; Calloni, Enrico; Caprara, Sergio; Carpinelli, Massimo; Contu, Andrea; D'Onofrio, Luca; D'Urso, Domenico; De Rosa, Rosario; Errico, L.; Esposito, Marina; Gagliardi, Gianluca; Grilli, Marco; Mangano, Valentina; Marsella, Maria; Naticchioni, Luca; Pasqualetti, Antonio; Pepe, Gianpiero; Perciballi, Maurizio; Puppo, Paola; Rapagnani, Piero; Ricci, Fulvio; Rosa, Luigi; Rovelli, Carlo; Rozza, Davide; Ruggi, Paolo; Saini, Naurang L.; Sequino, Valeria; Sipala, Valeria; Stornaiuolo, Daniela; Tafuri, Francesco; Trozzo, Lucia. - In: THE EUROPEAN PHYSICAL JOURNAL PLUS. - ISSN 2190-5444. - 139:2(2024). [10.1140/epjp/s13360-024-04920-x]
File in questo prodotto:
File Dimensione Formato  
s13360-024-04920-x.pdf

accesso aperto

Tipologia: Versione Editoriale (PDF)
Licenza: Copyright dell'editore
Dimensione 1.96 MB
Formato Adobe PDF
1.96 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/961661
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 1
  • ???jsp.display-item.citation.isi??? 0
social impact