Tevatron June 2006 Startup Plan

This is a draft version of the startup plan for May 15 through June to commission beam in the Tevatron after the FEB to May shutdown.  The plan that is present is still under development.

Overview of Completed Work During Shutdown.

Startup Considerations:

• Will need to commission the A0 abort system since 1) moved pbar kickers, 2) have questions about abort that quench F4 at start of shutdown.

• Commission A48 Collimator for prefire protection because it was replaced and moved.

• Figure out how and Commission the TEL for abort gap cleaning.

• CDF is physically sinking.  Looking to move IP. 

• We have new  and reworked separators that will need significant conditioning.

• EE support replaced the A2 or A3 current regulator.  We may have to make a prebeam check out of this by EE support.

• Have resimmed dipole magnets and unrolled quads which will effect settings for higher ordered circuits.

• Commission and test out A17 schottky since is was moved and cabled.

• One of the biggest concerns when starting up is that the feeddown circuits will need considerable tuning.

Operational modes that Tevatron will startup:

• We will commission  a new helix incorporating the newly installed B48 and A17  separators.  The new helix will replace the current helix at  150 , up the ramp, 980gev  and lowbeta.  Yuri will provide the new helix.  A side effect of the new helix will be the possible need to retune the feeddowns.  We will need a procedure for retuning the feeddowns.

• We are going to run the tunes below the 7/12 at roughly Qv = .576 and Qh = .583

• TEL 1 will be used for abort gap cleaning.

• Over the shutdown many applications were ported to linux and during the startup the consoles will be "BEST" mode where by incorporating  linux applications into startup.  Most of the applications have had some checkout to get certified under linux but could still have bugs.  Bugs and problems should be noted.

• There will be no high energy testing.  Appropriate ramping and time at lowbeta will be specified for turning on the tevatron ramp.

Collider Startup Schedule

Tevatron Pre-Beam Plan and Schedule

·        Obtain and send out new DFG settings based on known magnet moves/unrolls  (Annala, Martens)

o       Jerry will send new settings only for 150 GeV.  We can copy the rest up later.

o       The B0 Low Beta DFGs are zeroed out at flattop and low beta.

o       The above changes are saved in C50 file ????.

Separator Polarity Switch checkout:

• Verify all polarity switches are functional with correct convention.

• Verify C16, C48, C49, C13 + SA all work for new separators.

Verify all utilities are operational: vacuum, water, cryo.

• Loading files:  Load C49 file 1 and C50 file ???.

  •    Cycle C48 through a couple of times and complete a C23 reference mode check.

   

• Load Ring and Lowbeta QPM files:

• Complete collimator check out: 

  • Recall all collimators LVDT positions and verify operation.

   

• Main Power supply checkout and testing.

  • Low pot to find ground faults

  • Close knife switches for collider supplies (A3 set)

  • Setup T28, T34 for collider operation.

  • Verify TECAR working.

   

• Verifiy RF, BLM/BPM and TEL are ready:

  •  Instrumentation and software that will be checked by system groups.

   

• Controls:          (Operations)

• Add new devices to appropriate Tev D59 lists (See attached list of new devices)

• Clean up and reorder if necessary Tev D59 alarm lists.

• Verify that list D59 function.

• Cleanup and reorder D44 lists.

• Abort/200 module:       (Operations)

• Put Abort buttons in double punch mode.

• Verify Text of abort on T67 because there were changes.

• Spare inputs are now type 1 aborts.

• Verify that all abort inputs are configured for collider. (Tev)

• Water System:

• Verify water system is operational.              (Water)

• Verify all tunnel components are valved in.   (EE Support?)

o       Come back around, do a normal 20 min dry squeeze to prepare for injections.

o       Look for anomalous DFG behavior as result of new firmware via C23 compares.  (Readings should not change with the new firmware.)  We've already checked and corrected problems, but be vigilant in checking C23 compares.

Commission with Beam (# shifts needed is unsure 22 to 44)

Zero SQ and SQA0.

Zero H table dipoles at B0.

·         Establish circulating beam at 150 GeV  (Uncoalesced protons, central orbit)   2 shift

• Turn OFF T:OF and T:OD. 

  Set LBSEQ = 1.

  Turn off T:ILAM and inject small intensity beam to tevatron and verifiy P1 line orbit using I39 P1 file 581.   Dave Capista is expert if help is needed.  

• Set abort to first turn and inject.  Check Tev positions F17 - A0.   Compare to FLASH orbit using T39 file 364.
  150 GeV closed orbit in T39 file 660 (frame 0)

•  
•  Set abort out, and circulate beam. Get tunes, coupling, and chromaticity good enough to store beam.  Adjust tunes to .576, and .583.  Decouple to .003 or better.  Set chromaticities to 4 units in both planes.

Run Mike Martens' BPM Test (group of commands in the "Proton Pilot" sequencer aggregate).  Note any bad BPM. 

Smooth 150 GeV orbit.  Use T39 profile file 660 for smoothing, which is a “separator off” profile.

Do aperture scans at A0, B0, D0 , E0, B48, A17  to rule out any major problems from shutdown work.  (Notify CDF and D0 before starting.  We don't want them to be surprised by SVX or SMT aborts.)

·         Additional 150 GeV work   3-4 shifts

• Gather data at 150gev for optics.   (Valishev) 2hr

•  Complete verification of all separator polarities and 1 bumps using P163 .  (Alexahin)   2 hr.

• Verify aperture due to helix. (annala) 1 hr.

• Scans of feeddowns to determine optimal values. (Martens) 8 hr.

• Commission beam to the A0 abort  and verify clean aborts (P24, P25) (Hanna) 8 hr.

• Verify tune, coupling and chromaticty drifts.  (Martens)  2 X 4hrs

• Tune up E48 bumper timing since IRM was modified (Hanna, Bollinger) 2-4hr.

• Verify TEL operation  (Xiaolong)  1 hr

• Verify tune tracker operation   (Tan, Steimel) 1 hr

• Verify longitudinal damper operation  (Tan, Steimel)  1 hr

• Verify operation of flying wire  (parasitic investigation sufficient for now)

• Test P165 wtih beam before June 9.  (Valishev) 4 hr.

• Verify Reverse injection works after all the tuning. 2hr.

• Verify Instrumentation works like A17 schottky.  Parasitic

·         1st Ramp/Flattop  (Uncoalesced protons, central orbit)    1 shift  (tune up chart)

• Copy 150 GeV angles up to 980 GeV.
• Collect BPM and tune data up the ramp for future smooth and tune, coupling corrections. 
• At flattop, do any additional smoothing to get the desired flattop orbit.
• Set the flattop tunes, chromaticity, coupling . Qh = 0.583, Qv = 0.576,  Ch ~ 15, Cv ~15  and coupling < .005
• If needed

·         Parse  1st Squeeze  (Uncoalesced protons, central orbit)    1 shifts

o        Set all B0 H table DFG's to zero.  Parse to low beta; smooth orbits, adjust tunes and coupling as a rough first pass to get beam to LB.

·         Work on Ramp (Uncoalesced protons, central orbit)    1 shifts

• Once beam has been established up the ramp and through the squeeze,  work on the ramp to smooth the orbit and set the tunes, coupling and chromaticity.  include bumps at F0, A0. Shrink the F0 bump up the ramp such that at 980 the bump is reduced by 2 mm.

·         Work on Squeeze (Uncoalesced protons, central orbit)    1 shifts

• After first iteration, do another wet squeeze to gather orbit, tune data.
• Repeat as needed for additional tweaking.

·         Additional Work  up the Ramp & Squeeze (Uncoalesced protons, central orbit)    2 shifts

• Separator 1 bumps using P163 on Ramp and Squeeze.  (Alexahin)
• Optics Measurements at Flattop and Lowbeta.  (Valishev)
• Scans of Feeddown at Flattop and Collisions to  determine C49 constants.  (Martens)
• Commission A0 abort at Lowbeta (Hanna +)

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·         Tune-ups on the helices  (Uncoalesced protons)   9 shifts Total

    150Gev Tune up:  3 shifts

        Rough Idea of Plan

• Work left to do at 150gev is to make a plot of dCv,h vs S6A0.

• At 150gev measure tune, coupling and chrom for

  LBSEQ 0

  Open helix

  LBSEQ 1.

    Ramp/Flattop Tune up:  2 shifts

• To adjust slots from 200gev to 980gev, establish the Tevatron in ramping mode to start tuning the feeddowns up the ramp.

• Gather tune data on the central , proton and pbar helices and reduce the tune difference to better than .001 using the appropriate feeddown circuits.

    Squeeze Tune up:  2 shifts

• Parse the squeeze on the central orbit and measure tune and coupling.  Set tune to Qv= .576 and Qh = .583 and decouple better that .005.  For each LBSEQ goto the proton helix and measure the tune and minimum tune split.

    Collisions Tune up: 1 shift

• Still need to put new helix into C49, including transitioning helix from LBSEQ 23?.

• Complete a feeddown scan on new helix.

• Tune up tune, coupling and chrom at collisions on new helix.

·         Prepare for HEP   2 to 3 shifts

• The separators will need to be conditioned for at least 24 hours after the tuning of the feeddowns in the squeeze or if the polarity has been reversed from normal operation to decrease chances of sparking.  These 24 hours do not need to be continuous.

• Complete an entire ramp and squeeze on the proton helix with uncoalesced beam and vtick onto gather tunes and orbits.

•  Do a 36x0 or at least a 14X0 w/(P24 & P25) and conduct a proton only scrape.

• It is possible that there will be a 12X8 (use A1-A4, A13-A16, P1-P4, P13-P16, P25-P28)some store to provide luminosity for CDF and D0 to verify operation and shake out problems.  During this store or the first 36X36 we will need to do the following:

  • Verify A48 collimator position for abort kicker prefire protection.

  • Separator scans.

  • Verify Alignment of collimators at the end of a store. 

  • Clean abort with pbars and view them aborted Pbars on Abort BPM.

   

• Various instrumentation should be checked, too, e.g., pbar closure scopes, E17 Schottky, sync light.  I hope instrumentation personnel are available, if not in the MCR, during the shot/store.

·         Ready for HEP

o        Do a 36x36 store.