Minutes of the April 13, 2007 Tevatron Dept Meeting

https://indico.fnal.gov/conferenceDisplay.py?confId=768

* Weekly Operations Summary (Jerry Annala) - It was a rough week all around -
only 28 pb^-1 were delivered over the past 7 days.  There have been 7 stores
with initial luminosities between 148 and 213 ub^-1/s.  Only two were ended
unintentionally: store 5339 aborted after only 15 minutes due to an electrical
dump problem @ D2, and store 5345 ended after 14 hrs when a Commonwealth Edison
power glitch tripped off the RF stations and led to a quench.  While tuning
early in store 5338, ops mistakenly pushed the proton vertical tune too high, 
causing rapid emittance growth that cut instantaneous luminosity almost in
half.  The D0 losses during the squeeze are creeping up again.  There was 
plenty of downtime due to: failures in the B2, D2, and A3 dumps; wet engine
failures at A2 and D1; failure of the C0 beam valve by flaky microswitches; the
ComEd glitch.  There were fewer available pbars, too, due to other problems 
across the complex.  There were a couple hours of proton-only studies for 
commissioning the new sextupole circuits; TEL-1 also performed some parasitic
end of store studies.  The LARP/LHC Schottky electronics needed to be shipped
to CERN, so we are back to using the old system until our own set of new
electronics are built (couple of months).  The B3 power supply is ready to be
put back in the circuit.  The A17 horz separator is reporting (spurious?)
sparks while changing polarity during reverse injection tune-up.  One of the
C4Q5 leads seems to be running colder lately - an orifice change or trip limit
adjustment may be needed.

* Plans for Next Week

   - Try to get back to delivering >40 pb^-1 per week.
   - Complete the first part of new sextupole commissioning (tune-up to run
them at zero current) (Jerry, Alex - 4-8 hrs proton-only)
   - TEL-1 studies (Seva, Xiaolong, Vladimir - parasitic during HEP)
   - Chromaticity Tracker (Tan - proton-only)
   - AC Dipole (Ryoichi - proton-only)
   - P1 line matching (Andreas - proton-only/during shot setup)
   - E48 bumper as abort gap cleaner (Elmie, Jim - proton-only)
   - ...