Model March 08 2016
Previous action items (see march 1st minutes )
Contents
FOPT dispersion measurement versus 30Hz measurement
An ATLIS has been created to compare FOPT versus the 30Hz measurement.
Separator setup
a future release of eDT will set the angle
2R optics errors
There is still an optics error in the 2R region leading us to adjust 2R02 by 30 % or so. Quadrupoles in this region were checked multiple times. However this was done with a gaussmeter probe and may not have been sensitive enough to detect the error if it is due to a miswiring of the coils. A similar issue for the BT03 quadrupole was also missed with the probe and yet discovered when physically checking the connections at the patch panel.
Previous beam based differential orbit measurement in this region did not result in a clear outlier. We could not attribute the error to a single qua, hence the suspicion it must be miswiring. During the summer down, I will write an ATLIS to ask for a systematic check of the connections, using the same technique M. Tiefenback used for the BT03 quad.
Compton dipole setup
the current Optics decks have the compton dipole unpowered. It was done on purpose to avoid having the dipole loaded and turned on when we actually want to go straight-thru. We are considering to instead have the decks reflect the beam path going thru the chicane and have eDT load that BDL to setpoint 1 of the dipole.
Since eDT does not turn magnets off, it will still be setup in straight-thru but we will have the needed BDL in setpoint 1 when wanting to setup through the chicane. Setpoint 2 can be used as the zero field setpoint. We will check that this convention adheres to what is already the case elsewhere in the machine.
qsUtility
Scheduled to be released with the sqrt(2.0) bug fix as well as a number of other improvements.
Fast feedback in Hall A
It is likely underpowered for 11 GeV. The coils were not upgraded to run at twice the amperage when migrating from 6 to 12 GeV.
The 2L26 RF vernier is tripping the C100 zone as well. Concerned parties have been contacted to assess and hopefully fix it. I will (Yves) see if there is any benefit in moving some of the FFB correctors to a better location.
