From disks to planets: observational evidence of disk dispersal mechanisms
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Evaporato il cortocircuito, LHC è nuovamente ai blocchi di partenza
La ripartenza di LHC, che doveva avvenire la settimana scorsa, era stata posticipata a causa di un cortocircuito in uno dei magneti. Da quello che ne sapevamo fino a ieri, la riparazione del problema poteva prendere un periodo variabile da qualche giorno a qualche settimana: il problema è infatti localizzato in una zona fredda dell'acceleratore, alla quale non […] Continue reading
Una galassia ‘in forma’ ma non ditelo ad Einstein
L'effetto di strong lensing gravitazionale permette all'Atacama Large Millimeter/submillimeter Array dell'ESO di osservare una lontana galassia, la ricostruzione della sua struttura originaria consente di ricavare anche il suo elevato tasso di formazione stellare. Il risultato è stato ottenuto da un team guidato da ricercatori del Max Planck Institute für Astrophysik Continue reading
LHC restart back on track
The Large Hadron Collider has overcome a technical hurdle and could restart as early as next week.
On Monday, teams working on the Large Hadron Collider resolved a problem that had been delaying the restart of the accelerator, according to a statement from CERN.
On March 24, the European physics laboratory announced that a short circuit to ground had occured in one of the connections with an LHC magnet. LHC magnets are superconducting, which means that they can maintain a high electrical current with zero electrical resistance. To be superconducting, the LHC magnets must be chilled to almost minus 460 degrees Fahrenheit.
The short circuit ocurred between a superconducting magnet and its diode. Diodes help protect the LHC's magnets by diverting electrical current into a parallel circuit if the magnets lose their superconductivity.
When teams discovered the problem, all eight sections of the LHC were already cooled to operating temperature. To fix the problem, they knew that they might have to go through a weeks-long process of carefully rewarming and then recooling one section.
The short circuit was caused by a fragment of metal caught between the magnet and the diode. After locating the fragment and examining it via X-ray, engineers and technicians decided to try to melt it. They could do this in a way similar to blowing a fuse. Importantly, the technique would not require them to warm up the magnets.
They injected almost 400 amps of current into the diode circuit for a few milliseconds. Measurements made today showed the short circuit had disappeared.
Now the teams must conduct further tweaks and tests and restart the final commissioning of the accelerator. The LHC could see beams as early as next week.
Protoammassi, i dinosauri del cosmo
Con un’inedita operazione a due, i satelliti gemelli Herschel e Planck dell’Agenzia spaziale europea hanno identificato i precursori delle attuali strutture a grande scala dell’universo. Mattia Negrello (INAF di Padova): «La loro abbondanza dipende dalla geometria dell’universo» Continue reading
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