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S30XL-LESA/LDMX
Property | Specified Value | Comment |
---|---|---|
Vacuum Pressure | 10-6 Torr |
|
Maximum Radiation Dose | 1X1014 2 GeV electrons (~3X1013 1MeV NEQ) |
|
Maximum Magnetic Field | 0.55 Tesla |
|
Target | 0.125% X0 Tungsten (approx. 4 microns thickness) |
|
# tracking planes | 5 | two modules per plane, one above and one below the dead zone |
Sensors per module | 2, in small angle stereo configuration |
|
Stereo angles L1; L2; L3; L4; L5 (mrad) | (0/100); (0,100); (0,50); (0,50); (0,50) | 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 (y positions) | +/- 15 mrad | between sensitive regions |
z-positions from target (mm) | 100, 200, 300, 500, 700 |
|
x-positions w.r.t. photon line | 0 in all layers |
|
y movement (motorized) | top and bottom halves move separately in y with +/- 20 mm range | for nominal positions see dead zone specification above |
pitch movement (motorized) | +/- 20 mrad | implied by y adjustability above at both ends in z |
yaw movement (manual) | +/- 20 mrad |
|
module power consumption | 3.45 W | 345 mW/chip, 5 chips per hybrid, 2 hybrids per module |
nominal bias voltage | 150V |
|
maximum bias voltage | 500V |
|
total leakage current @ 500V and after irradiation | < 100 uA | < 50 mW |
vacuum chamber wall temperature | < 40 C |
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radiative heat load on each sensor | < 0.5 W | assumes silicon at -10C, vac. chamber at 40C, silicon emissivity of 0.7 |
Material | <1% X0 per measurement pair averaged over tracking volume |
|
Sensor Temperature | <0C over entire sensor before irradiation |
|
APV25 Temperature | <30C for all chips |
|
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 |
Inter-plane alignment of non-bend sensors | within 0.5 mrad for all modules on each side of dead zone | means non-bend strips are projective to within 1 strip over entire solid angle |
Stereo Angle Consistency | within 0.5 mrad of nominal in all layers |
|
Bend-plane (y) position stability | within 10 microns over all sensor surfaces on each side of dead zone during all running |
|
Non-bend (x) position stability | within 25 microns over all sensor surfaces on each side of dead zone during all running |
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z position stability | within 50 microns over all sensor surfaces on each side of dead zone during all running |
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