Minutes of the Jan 27, 2006 Tevatron Dept Meeting
* News (Ron) - Please attend the All Hands' Meeting today in Ramsey Auditorium.
There have been some changes in the Accelerator Division organization: Bruce
Baller is now the Associate Division Head for Finances and Projects, Elvin
Harms will become the Deputy Head of the 3.9 GHz Cryomodule Project, Keith
Gollwitzer is the new Antiproton Source Dept Head, Sergei Nagaitsev is Deputy
Head of ILC and the Associate Head of AD for Linear Accelerator R&D, and Paul
Derwent will become the new Recycler Dept Head.
* Weekly Summary (Andreas) - There have been no HEP stores since we are still
recovering from warming up A4 to fix an insulating vacuum leak.  The main
leak at A44 was caused by a faulty O-ring.  Several other smaller leaks were
also repaired, including an O-ring between the A4 Q2 and Q3 low-beta quads and
a leaky weld on that same Q2.  We are nearly ready for an HEP store.  We have
completed a first check-out with beam, but want to check the squeeze again
before trying a 12x0 store.  Start-up was delayed by D0 searching for a source
of electronic noise in their calorimeters and accesses in other parts of the
complex.  Alex made differential orbit measurements at 150 GeV and low-beta
to check the optics.  The TEL's HV current readback has finally been fixed (2
burned resistors in the modulator), but the modulator is still having other
problems (dying tube?).  A command was added to the sequencer that
automatically reenables and validates alarms when the Tev comes around to 150
GeV.  This should help prevent the problem with bypassed alarms that led to
the quench of store 4594.
* Optics Measurements and Lifetime Simulations (Alex) - Alex acquired
differential orbit data at 150 GeV and low-beta to check the optics.  The data
for the injection optics look fine except for six BPMs that returned flaky
data.  During the measurements at low-beta, the VA49 dipole corrector tripped
off, so Alex will need to throw away the off-momentum data, but the other
data is OK.  Alex has also been conducting lifetime simulations for possible
new working points near 1/2 and 2/3 (SPS). At current beam-beam tune shift
parameter xi = 0.01, there is little benefit (in luminosity lifetime) in
changing to a new working point. However, for tune shift parameter if
xi = 0.013, i.e. increasing the proton intensity by 30%, the lifetime degrades
for the current operating point, while the lifetimes for the other working
points remain nearly the same.  In other words, if we want to increase proton
intensity significantly, we should move to a new working point.
* Manual Reset of the "Delta Devices" (Ron) - Two weeks ago, Ron showed
new devices that provide the changes in certain bunch-by-bunch quantities
since preprogrammed clock events (open helix, ramp, squeeze, initiate
collisions).  He added a manual reset of those delta devices to allow looking
at changes in those quantities, say, during end-of-store studies.  A user
can send a reset to the device T:DELDEV to reinitialize the delta devices.
* Plan for next week:  get the Tevatron back-up and resume normal operation!
There are a few proton-only and end-of-store studies that are ready when the
machine allows.