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Table 6
Dependencies in the Planck cryosystem.
| Component | Affected by | Affects | Trade-off | |
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| V-groove 3 temp. .......... | Sorption cooler mass flow | Efficiency of the sorption cooler system; sorption cooler required mass flow; sorption cooler power & cycle time. | ||
| Warm Radiator temp. | Sorption cooler power | TLVHX1,2 | ||
| Warm radiator heater power | 4He-JT cooler efficiency | |||
| 4He-JT cooler heat load | ||||
| Warm Radiator stability | Warm radiator heater control | TLVHX1,2 stability | ||
| Sorption Cooler System | V-groove 3 temperature | Sorption cooler heat lift | ||
| Power | Warm radiator temperature | Sorption cooler temperature; 4He-JT | ||
| Cycle time | cooler efficiency; 1.4 K efficiency | |||
| TSA power | ||||
| LPSB | ||||
| Warm radiator stability | Sorption cooler stability Sorption cooler lifetime Temperature of 4 K box Temperature of 4 K loads Temperature and stability of LFI |
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| 4 He-JT Cooler | LFI temperature TLVHX1 V-groove 3 temperature |
T, heat lift | ||
| Fill pressure..................... | 4He-JT cooler efficiency and temperature | |||
| Stroke frequency.................... | Could affect microphonics if vibration control system off. Small effect on cooling power. | |||
| Stroke amplitude.................... | Affects gas flow | Heat lift, lifetime | ||
| PID power.................... | Temperature and temperature stability; margin on heat lift (found to be large in thermal balance/thermal vacuum tests). | T, T stability | ||
| Vibration control system.................... | Dilution (via microvibrations if vibration control system off) | |||
| Dilution Cooler.................... | 4 K and 1.4 K precool temp | Instability of 4 K and 1.4 K if 1.4 K too cold (unstable evaporation) | Heat lift, T, lifetime | |
| Flow rate 1.4 K PID power Dilution plate PID Bolometer plate PID |
SVM temperature | Changes the isotope flow for a given choice of restrictions | T, T stability, margin (long timescale) | |
| T, T stability, margin (short timescale) | ||||
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