Summary
- This is a landing page for ALS Low Level RF System Requirements
- Derived implementation requirements can be found in the child pages and the hardware pages:
- An upgrade is currently in progress for the Sub Harmonic Bunchers and the LINAC controllers
- LINAC is 1us, buncher is 30 us
- The pulse repetition rate is 0.7 Hz.
- Right now the LINAC pre-amp is saturated
Cavity Controllers
SHB Chassis Channel Summary | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Channels | Slice | Rx/Tx | Freq Typ (MHz) | Freq Min (MHz) | Freq Max (MHz) | RF Power* Typ (dBm) | RF Power Min (dBm) | RF Power Max (dBm) | Notes |
SHB1 Forward | Rx0 | Rx | 124.90 | 110 | 140 | -10 | 0 | Currently LN:HSD1 Ch7 (? to be confirmed) | |
SHB1 Reverse | Rx0 | Rx | 124.90 | 110 | 140 | -10 | 0 | ||
SHB1 Cell (Feedback) | Rx1 | Rx | 124.90 | 110 | 140 | 20 | |||
MO1 | Rx2 | Rx | 499.64 | 490 | 510 | 0 | -15 | 15 | |
SHB2 Forward | Rx2 | Rx | 499.64 | 490 | 510 | -10 | 0 | Currently LN:HSD1 Ch8 (? to be confirmed) | |
SHB2 Reverse | Rx3 | Rx | 499.64 | 490 | 510 | -10 | 0 | ||
SHB2 Cell (Feedback) | Rx3 | Rx | 499.64 | 490 | 510 | 20 | |||
SHB1 drive | Tx0 | Tx | 124.90 | 110 | 140 | 0 | 5 | ||
SHB2 drive | Tx1 | Tx | 499.64 | 490 | 510 | 0 | 5 | ||
RF Power defined at the input connector to the chassis.
3 GHz LINAC (MOD1 and MO2)
| MOD1 Chassis Channel Summary | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Channels | Slice | Rx/Tx | Freq Typ (MHz) | Freq Min (MHz) | Freq Max (MHz) | RF Power* Typ (dBm) | RF Power Min (dBm) | RF Power Max (dBm) | Notes |
| Kly1 Forward (Feedback) | Chassis 0 Rx0 | Rx | 2997.84 | 2900 | 3100 | 102 | 20 | CurrentlyLN:HSD2 Ch7 (? to be confirmed) https://controls.als.lbl.gov/pvinfo/pv/LNRF:KLY1:RFForwardPower | |
| Kly1 Reverse | Chassis 0 Rx0 | Rx | 2997.84 | 2900 | 3100 | 86 | 20 | https://controls.als.lbl.gov/pvinfo/pv/LNRF:KLY1:RFReversePower | |
| AS1 Forward | Chassis 0 Rx1 | Rx | 2997.84 | 2900 | 3100 | 20 | CurrentlyLN:HSD2 Ch3 (? to be confirmed) | ||
| AS1 Reverse | Chassis 0 Rx1 | Rx | 2997.84 | 2900 | 3100 | 20 | CurrentlyLN:HSD2 Ch5 (? to be confirmed) | ||
| AS1 Load FWR | Chassis 0 Rx2 | Rx | 2997.84 | 2900 | 3100 | 20 | Currently LN:HSD2 Ch1 (? to be confirmed) | ||
| SBB Forward | Chassis 0 Rx2 | Rx | 2997.84 | 2900 | 3100 | 82 | 85 | ||
| MO LINAC | Chassis 0 Rx3 | 499.64 | 490 | 510 | 0 | -15 | 15 | ||
| Mod1 drive | Chassis 0 TX0 | Tx | 2997.84 | 2900 | 3100 | 0 | 5 | ||
| LINAC (Mod2) Chassis Channel Summary | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Channels | Slice | Rx/Tx | Freq Typ (MHz) | Freq Min (MHz) | Freq Max (MHz) | RF Power* Typ (dBm) | RF Power Min (dBm) | RF Power Max (dBm) | Notes |
| Kly2 Forward (Feedback) | Chassis 1 Rx0 | Rx | 2997.84 | 2900 | 3100 | 102 | 20 | LN:HSD2 Ch8 | |
| Kly2 Reverse | Chassis 1 Rx0 | Rx | 2997.84 | 2900 | 3100 | 84 | https://controls.als.lbl.gov/pvinfo/pv/LNRF:KLY2:RFReversePower | ||
| AS2 Forward | Chassis 1 Rx1 | Rx | 2997.84 | 2900 | 3100 | 20 | LN:HSD2 Ch4 | ||
| AS2 Reverse | Chassis 1 Rx1 | Rx | 2997.84 | 2900 | 3100 | 20 | LN:HSD2 Ch6 | ||
| AS2 Load FWR | Chassis 1 Rx2 | Rx | 2997.84 | 2900 | 3100 | 20 | LN:HSD2 Ch2 | ||
| SBB Reverse | Chassis 1 Rx2 | Rx | 2997.84 | 2900 | 3100 | 82 | 85 | ||
| MO LINAC | Chassis 1 Rx3 | Rx | 499.64 | 490 | 510 | 0 | -15 | 15 | |
| Mod2 drive | Chassis 1 TX0 | Tx | 2997.84 | 2900 | 3100 | 0 | 5 | ||
Timing Diagrams
Waveforms
| Blue = Klystron 1 Pink = Klystron 2 Green = S-band Buncher FWD Yellow = Klystron 1 Reflected AS1 FWD? |
| Blue = Klystron 1 Pink = Klystron 2 Green = S-band Buncher FWD Yellow = Klystron 1 Reflected AS1 LOAD? |
| AS1 Reverse Power Trip signature |
