Oxygen-free high-conductivity

The TMoio microwave cavity design is very simple, consisting of a cylindrical hollow cut into a block of oxygen-free high-conductance copper, with an end-cap to form a lid. The TMoio mode has axial electric field with an antinode on the axis of the cylinder. Beam holes on axis thus allow the 2Si/2 ions to pass through the highest electric field, which quenches them. The mode frequency, which depends on the cavity radius, is set to the Lamb shift frequency of 14.04 GHz. We... 

The electrons emitted by the photocathode are subsequently accelerated to 50 kV and focused on to a toroid-shaped anode. The anode is made of oxygen-free, high conductivity copper and is maintained at a high positive potential. The electron pulses interact with the copper anode forcing the emission of Cu-Ka x-ray photon pulses, which exit the vacuum chamber through a thin beryllium-foil window. A bend germanium crystal monochromator disperses and focuses the x-rays onto the sample. The duration of the x-ray pulses is measured by a Kentech x-ray streak camera fitted with a low density Csl photocathode. The pulse width of the x-rays at 50 kV anode-cathode potential difference is about 50 ps. This value is an upper limit for the width of the x-ray pulses because the transit time-spread of the streak camera has to be taken into consideration. A gold photocathode (100 A Au on 1000 A peiylene) is used to record the 266-nm excitation laser pulses. The intensity of the x-rays is 6.2 x 10 photons an r (per pulse), and is measured by means of a silicon diode array x-ray detector which has a known quantum efficiency of 0.79 for 8 kV photons. 

Pure or elemental copper, also known as oxygen-free high-conductivity copper (OFHC), has a low annealing point. When annealed, the mechanical... 

Oxygen-free high conductivity, Cu-OF, with 99.95% Cu. Oxygen uptake is avoided during refining ... 

Electrical and other properties of copper render it the most widely used metallic conductor. Oxygen-free high-conductivity (OFHC) copper, having extremely low oxygen and other impurity contents, is produced for many electrical applications. Aluminum, having a conductivity only about one-half that of copper, is also frequently used as an electrical conductor. Silver has a higher conductivity than either copper or aluminum however, its use is restricted on the basis of cost. 

Data from White (1987 p. 133) and Touloukian and Ho (1970). OFHC, oxygen-free high-conductivity ETP, electrolytic tough pitch. 

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