Loops being implemented

Following is a brief description of each loop which has been implemented with the new fast feedback system.

1. SOURCE TMIT: This reads the intensity (TMIT) from a BPM just after the polarized gun and adjusts the laser intensity (with a Pockel's cell) to keep a constant electron beam intensity.
2. LI00 e: This reads BPMs in LI00 and adjust correctors to correct the launch positions and angles.
3. LI01 e: This reads BPMs in LI01 and adjust correctors at the beginning of LI01 to correct the launch positions and angles.
4. NLTR and SLTR launch and energy: These are very important loops but also very complicated. They control three beam energies (electron, positron, and scavenger) and eight positions and angles (position and angle for electrons and positrons in the vertical and horizontal). Everything is highly coupled. So far just the the electron energy loop has been implemented.
5. North Ring Extraction: This reads BPMs in the NRTL and uses correctors near the beginning of the NRTL to correct the launch positions and angles. This loop also measures, but does not correct the energy in the NRTL.
6. NRTL e: This reads BPMs in LI02 and adjusts correctors in the NRTL to correct the launch positions and angles of the electron beam.
7. South Ring Extraction: This reads BPMs in the SRTL and uses correctors near the beginning of the SRTL to correct the launch positions and angles. This loop also measures, but does not correct the energy in the SRTL.
8. SRTL e: This reads BPMs in LI02 and adjusts correctors in the SRTL to correct the launch positions and angles of the positron beam.
9. LI03 e and e: This reads BPMs in the last three quarters of LI03 and adjusts the first few correctors in LI03 to correct the launch positions and angles.
10. LI04 e and e: This is just like the LI03 loop put one sector down-stream.
11. LI06 e,e: This reads all the BPMs in LI06 and the first few in LI07 and adjusts correctors at the beginning of LI05 to correct the launch positions and angles of the luminosity electron and positron beams.
12. LI11 e,e: This reads all the BPMs in LI11 and the first few in LI12 and adjusts correctors at the end of LI10 to correct the launch positions and angles of the luminosity electron and positron beams.
13. LI18 e,e: This reads all the BPMs in LI18 and the first few in LI19 and adjusts correctors at the end of LI17 to correct the launch positions and angles of the luminosity electron and positron beams.
14. Scavenger energy: This loop adjusts the energy going into the scavenger extraction line in sector 19. Note that this loop works hand-in-hand with the new fast feed forward system.
15. EP02 e: This loop uses a measurement of the positron target position to correct for a steering of the positron beam caused by it. It is not done yet.
16. LI23 e,e: This reads all the BPMs in LI23 and the first few in LI24 and adjusts correctors at the end of LI22 to correct the launch positions and angles of the luminosity electron and positron beams.
17. LI27 e,e: This reads BPMs in LI27 and LI28 and adjusts correctors in LI26 and LI27 to correct the launch positions and angles of the luminosity electron and positron beams as they enter the collimator region at the end of the Linac.
18. FB31 e,e energy: This reads BPMs in LI31, CA01, and CA11 (it actually has signals split from BPMs controlled by those micros which it reads with BPM processors in an FB31 CAMAC crate) and adjusts sub-booster phase shifters to control the electron or positron energy (one or the other, but not both at the same time). This is not done yet and is still controlled by an old fast feedback loop.
19. NFF: this reads BPMs in the north final focus and adjusts correctors at the beginning of the NFF to correct the launch positions and angles of the electron beam into the rest of the NFF. It also will measure, but not adjust, the energy.
20. SFF: Same as the NFF but for the south final focus.
21. IP COLLIDE: This reads BPMs in FB69 and adjusts correctors in FB69 to measure and correct the beam-beam deflection and hence keep the two beams in collision.