LHC will work even in winter
Repair of the Large Hadron Collider has been going on for eight months and will be completed in September, a year after the accident.
On September 19, 2008, a breakdown occurred due to the poor-quality welding of two copper plates (busbar), through which a superconducting cable runs.
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Sharply increased resistance, the contacts warmed up and exploded. As a result of the accident, this is what happened.
During the repair, about 1,700 such plates have already been examined and many have found similar problems (photo of poor-quality welding of LHC plates under the surface).
Engineers have replaced bad areas and just in case introduced a new monitoring system that will track resistance jumps in real time. Additional valves for cooling helium are also installed, so that after the collider resumes operation there should be no more problems. At least, there should be no problems with poor-quality welding.
The collider is planned to be put back on line in September 2009, and CERN engineers even want to change its standard work schedule. The fact is that the BAC should stop working for the winter period, because at that time, because of the cold weather, the costs of power supply to the installations increase too much.
BAK accelerators are designed for a maximum energy of 7 TeV, and in normal mode they operate at 5 TeV. All electromagnets together have a capacity that can melt 15 tons of copper at a time. Each particle beam has a capacity of 350 MJ (like 90 kg of TNT explosives), enough to burn a 30-meter hole in a copper block. It is clear that the installation requires a lot of electricity.
However, this year, if the launch is carried out successfully, the experiments will take place in the fall and, if necessary, even in winter. Financial resources for additional energy supply appeared due to savings due to downtime, because at that time no experiments were conducted and energy was not wasted. So no additional funding is required.
via CERN , ZDNet
On September 19, 2008, a breakdown occurred due to the poor-quality welding of two copper plates (busbar), through which a superconducting cable runs.
')
Sharply increased resistance, the contacts warmed up and exploded. As a result of the accident, this is what happened.
During the repair, about 1,700 such plates have already been examined and many have found similar problems (photo of poor-quality welding of LHC plates under the surface).
Engineers have replaced bad areas and just in case introduced a new monitoring system that will track resistance jumps in real time. Additional valves for cooling helium are also installed, so that after the collider resumes operation there should be no more problems. At least, there should be no problems with poor-quality welding.
The collider is planned to be put back on line in September 2009, and CERN engineers even want to change its standard work schedule. The fact is that the BAC should stop working for the winter period, because at that time, because of the cold weather, the costs of power supply to the installations increase too much.
BAK accelerators are designed for a maximum energy of 7 TeV, and in normal mode they operate at 5 TeV. All electromagnets together have a capacity that can melt 15 tons of copper at a time. Each particle beam has a capacity of 350 MJ (like 90 kg of TNT explosives), enough to burn a 30-meter hole in a copper block. It is clear that the installation requires a lot of electricity.
However, this year, if the launch is carried out successfully, the experiments will take place in the fall and, if necessary, even in winter. Financial resources for additional energy supply appeared due to savings due to downtime, because at that time no experiments were conducted and energy was not wasted. So no additional funding is required.
via CERN , ZDNet
Source: https://habr.com/ru/post/60729/
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