# Progress in a Vacuum Weight Search Experiment

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## Abstract

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## 1. Introduction

## 2. General Scheme of the Experiment

## 3. The Cryogenic System

#### Temperature Actuators

## 4. The Balance Prototype

## 5. Discussion

## Author Contributions

## Funding

## Conflicts of Interest

## References

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**Figure 1.**Sketch of the final balance experiment. Each disc is suspended on one end-arm and surrounded by a metallic enclosure for thermal actuation (not shown). The optical read-out is a Michelson interferometer and the signal is taken with respect to a reference arm.

**Figure 2.**Cryostat. It is formed by three chambers: the experimental chamber, the liquid nitrogen chamber and the insulation chamber. The total height is 3.15 m, the diameter of the inner chamber is 1.8 m, and the diameter of the most external chamber is 2.4 m. The basement is formed by three flanges, the most external has diameter of 2.6 m.

**Figure 6.**Block diagram of the balance control loop. See text for the meaning of each block and signal names.

**Figure 7.**Interferometric signal (green), the signal $\alpha H\xb7{V}_{corr}$ (blue), and the subtracted signal named $Out$ (red), see text for the definitions of the variables.

**Figure 8.**Balance sensitivity to torque before (blue) and after (red) subtraction. The final expected signal is shown in black.

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## Share and Cite

**MDPI and ACS Style**

Avino, S.; Calloni, E.; Caprara, S.; De Laurentis, M.; De Rosa, R.; Di Girolamo, T.; Errico, L.; Gagliardi, G.; Grilli, M.; Mangano, V.;
et al. Progress in a Vacuum Weight Search Experiment. *Physics* **2020**, *2*, 1-13.
https://doi.org/10.3390/physics2010001

**AMA Style**

Avino S, Calloni E, Caprara S, De Laurentis M, De Rosa R, Di Girolamo T, Errico L, Gagliardi G, Grilli M, Mangano V,
et al. Progress in a Vacuum Weight Search Experiment. *Physics*. 2020; 2(1):1-13.
https://doi.org/10.3390/physics2010001

**Chicago/Turabian Style**

Avino, Saverio, Enrico Calloni, Sergio Caprara, Martina De Laurentis, Rosario De Rosa, Tristano Di Girolamo, Luciano Errico, Gianluca Gagliardi, Marco Grilli, Valentina Mangano,
and et al. 2020. "Progress in a Vacuum Weight Search Experiment" *Physics* 2, no. 1: 1-13.
https://doi.org/10.3390/physics2010001