Laboratory: Legnaro National Laboratory of INFN
National Responsible: G. Cantatore (Ts)
1. Goal of the experiment
Several effects, such as photon-photon scattering and particle production from a two-photon interaction, contribute to the complex structure of the quantum vacuum. Pursuing a detection strategy based on optical techniques, these interactions are studied in PVLAS by sending a linearly polarised laser beam through a transverse magnetic field, and by measuring changes in the polarisation state of the light.
More on the experiment...
Activities during 2001
A frequency-doubled laser has been tested in Trieste by achieving frequency-lock to a trial Fabry-Perot cavity. Installation on the main apparatus has however been postponed to 2002, since a signal has already been detected and is now under study. To clarify the nature of this detected signal, 45 hours of actual data acquisition have b,en completed by 31/12/2001
The following achievements have been obtained:
- 45 hours of actual data acquisition
|Magnetic shielding tests completed. Validation tests on the vibration reduction feedback system||30-04-2002|
|Frequency-doubled laser installed at LNL and relative tests completed||31-08-2002|
|30 hours of data acquisition with frequency-doubled laser||31-12-2002|
3. INFN contribution to the experiment in terms of manpower and financial support
4. Publications in refereed journals (in 2001): 2
5. Number of talks at conferences (in 2001):
6. Number of undergraduate and doctoral theses on the experiment:
7. Leadership roles in the experiment
8. Innovative instruments
9. Competing experiments
PVLAS is at the moment the only operating experiment in the world having direct access to low energy photon-photon scattering processes.
Main PVLAS technological leads:
10. International committee which has reviewed the experiment
PVLAS is annually reviewed by the INFN National Committee on non-accelerator particle physics