Two Boson and two Fermion Cross Sections at LEP2 and Constraints for Physics Beyond the Standard Mod

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Extraction of beam into TT40 (Transfer Line from
SPS to LHC)
Mitaire Ojaruega University of Michigan     Dr.
Mike Lamont CERN, Geneva, Switzerland
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SPS Overview
SPS fixed target experiments injector to LHC
(2006)
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Towards the LHC beam tests

• TT40
• 2 x 24 hours, September/October 2003
• TI8
• 4 x 24 hours, September 2004
• LHC sector test (one eighth of the ring)
• 2 weeks, April 2006
• TI2 commissioning
• April 2007
• LHC commissioning
• April onwards 2007

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SPS control room
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Tunnel
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Main elements

• Bending Magnets
• dipoles
• Focusing Magnets
• quadrupoles
• Closed orbit
• Measured with pickups
• Corrected with small dipole corrector magnets
• Extraction
• Bump circulating beam towards extraction point
• Fast kicker magnet kick beam out of ring into
  extraction channel
• Septum magnet to guide beam into transfer line

Beam bunched, lots of bunches, around 1011
particle per bunch
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Closed orbit extraction bumps
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4 x HB, 4 x VB, 5 x MKE, 1 x TPSG4, 6 x MSE
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Basic accelerator physics

• As particles speeds around the ring, it performs
  transverse oscillations. These obey the Hills
  Equation.
• The solution to Hills equation is similar to
  that of the SHM
• This solution maybe parameterized in terms of
  Twiss parameters, which allows the calculation
  of beam size, trajectory correction etc. Very
  important for good control of beam at extraction.

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MAD
Optics calculations are (at CERN) usually done
with MAD. (Takes as input a description of the
accelerator or transfer line and magnet strengths
- can calculate lots of stuff.)

• Calculated closed orbit extraction bump in SPS
• Produced input files for the first part of TI8
• Calculated Twiss parameters for this part of the
  line.

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MAD sequence files

• TI8 SEQUENCE, L 2699.14948
• PT4 marker, AT
  0
• MDMV400097 MDMV1, AT 3.706
• BPK_400099 BPKV1, AT 4.305
• QTMD400100 MQI1, AT 5.5
• MDMH400104 MDMH1, AT 6.774
• BTV_400105 OTR1, AT
  7.373
• MBHC400107 BH1, AT 10.5,
• MBHC400118 BH1, AT 16,
• MBHC400129 BH1, AT 21.5,
• QTRF400200 QTL2, AT 28.252
• BPK_400207 BPKH2, AT 30.475

Corrector
Pickup
Quadrupole
Corrector
Screen
Bending Magnets
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Beta Function
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Closed orbit extraction bump
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Summary

• Beam to LHC from SPS at 450 GeV via TI8
• Extraction bump, kick, septa, and then bending
  and focusing in the line.
• Lots of instrumentation to make sure the beam is
  going in the right direction
• Bumps and Twiss parameters calculated using MAD
• Will be tested in extraction test which takes
  place in 3 weeks

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Acknowledgement
Many thanks to my supervisor Mike Lamont, Jean
Krisch, Homer ONeal, Tom Dershem, Busted,
Lucas, Obnoxious Mute, Mr. Word, Ms. Cool, Slow
Blinker, Phi Bang, Sambuca, Terrorist, Mr. Fish,
Brian Adams, Anti word, Dr. Love National
Science Foundation and the University of Michigan