First Year of BABAR/PEP-II - Harvard University Laboratory for ...
First Year of BABAR/PEP-II - Harvard University Laboratory for ...
First Year of BABAR/PEP-II - Harvard University Laboratory for ...
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Drift Chamber (DCH)<br />
324 1015 1749<br />
68<br />
35<br />
202<br />
17.19<br />
551 973<br />
9 GeV e − 3.1 GeV e +<br />
IP<br />
236<br />
469<br />
1618<br />
◆ 7104 hexagonal cells in 40 layers = 10 superlayers x 4 layers each.<br />
◆ 4 axial and 6 stereo superlayers: AUVAUVAUVA.<br />
◆ Low mass materials to reduce multiple scattering.<br />
➤He:iC 4 H 10 (80:20) gas. Al field wires.<br />
➤Be inner cylinder (0.28% X 0 ). Carbon fibre outer cylinder (1.5% X 0 ).<br />
➤Al endplates (12 mm <strong>for</strong>ward, 24 mm backward).<br />
<strong>First</strong> <strong>Year</strong> <strong>of</strong> BaBar/<strong>PEP</strong>-<strong>II</strong> Masahiro Morii SLAC
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