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S30XL-LESA/LDMX
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Property | Specified Value | Comment |
---|---|---|
Vacuum Pressure | 10E-6 Torr |
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Maximum Radiation Dose | 1E14 2 GeV electrons (~3E13 1MeV NEQ) |
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Maximum Magnetic Field | 0.55T |
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Target | 0.125% X0 Tungsten (approx. 4 microns thickness) |
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# tracking planes | 5 | two modules per plane, one above and one below the dead zone |
Sensors per module | 2, in small angle stereo configuration |
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Stereo angles L1; L2; L3; L4; L5 (mrad) | (0/100); (0,100); (0,50); (0,50); (0,50) mrad | stereo sensors dip away from dead zone on electron side. Stereo sensors rotated about centers. |
Nominal dead zone between non-bend sensors w.r.t. photon line | +/- 15 mrad |
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z-positions from target (mm) | 100, 200, 300, 500, 700 |
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x-positions w.r.t. photon line | 0 in all layers |
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y-positions w.r.t. photon line |
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Specification | Allowed Value | Comment |
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Material | <1% X0 per measurement pair averaged over tracking volume |
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Sensor Temperature | <0C over entire sensor before irradiation |
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APV25 Temperature | <30C for all chips |
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APV25 Temperature Stability | constant within 3C during physics running | does not include chip to chip variations, which can be larger |
Flatness | all sensors planar within 50 microns total | includes thermal deformation |
Non-bend Alignment of planes | within 0.5 mrad for all modules on each side of dead zone | means strips are projective to within 1 strip over entire solid angle |
Stereo Angle Consistency | within 0.5 mrad of nominal in all layers |
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Bend-plane alignment stability | within 10 microns over all sensor surfaces on each side of dead zone during all running |
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Non-bend alignment stability | within 25 microns over all sensor surfaces on each side of dead zone during all running |
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Z alignment stability | within 50 microns over all sensor surfaces on each side of dead zone during all running |
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