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Matching section layout vs. crab-cavity voltage. Barbara Dalena A. Chancé , J. Payet R. De Maria, S. Fartoukh. Contents. introduction and motivation reduction of crab voltage new IR1/5 Matching S ection (MS) layout (except Inner Triplet (IT), see R. De M aria’s talk)

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matching section layout vs crab cavity voltage

Matching section layout vs. crab-cavity voltage

Barbara Dalena

A. Chancé, J. Payet

R. De Maria, S. Fartoukh

contents
Contents
  • introduction and motivation
    • reduction of crab voltage
  • new IR1/5 Matching Section (MS) layout

(except Inner Triplet (IT), see R. De Maria’s talk)

  • properties of the new layout
    • injection optics
    • squeeze-ability
    • chromatics properties

2nd joint HiLumi LHC-LARP Annual Meeting, 15 November 2012 Frascati

slide3

INTRODUCTION

2nd joint HiLumi LHC-LARP Annual Meeting, 15 November 2012 Frascati

crab cavity voltage
Crab cavity voltage

Reduce the voltage of the crab cavity: V  1/(*)1/2

D2

CRAB

Q4

Q5

Q6

Q7

  • increasing the beta
  • functionat the CRAB
  • using
  • MS quadrupole types
  • MS quadrupole positions

2nd joint HiLumi LHC-LARP Annual Meeting, 15 November 2012 Frascati

optimization desiderata
Optimization desiderata

Higher  function at crab cavity location

Compatible with

injection optics (at * as low as possible)

pre-squeeze within and possibly beyond the chromatic limits

squeezable to very low * to back-up ATS

Optics used for this study is the option with the triplet gradient of 170 T/m

2nd joint HiLumi LHC-LARP Annual Meeting, 15 November 2012 Frascati

new matching section layout
New matching section layout

D2

CRAB

Q4

Q5

Q6

Q7

Q7+

D2

CRAB

Q4

Q5

Q6

Q7

22.1 m

22.1 m

new

2nd joint HiLumi LHC-LARP Annual Meeting, 15 November 2012 Frascati

slide7

INJECTION

2nd joint HiLumi LHC-LARP Annual Meeting, 15 November 2012 Frascati

injection optics
Injection optics
  • possibility to build injection
  • optics with * of 2.0-3.0 m
  • w and w/o ATS R/L phases
  • difficult to build injection
  • optics with *  4.0 m,
  • because the added
  • quadrupole Q7+ becomes
  • too weak

* = 2.5 m

2nd joint HiLumi LHC-LARP Annual Meeting, 15 November 2012 Frascati

injection apertures
Injection apertures
  • aperture problem in Q6
  •  can be cured by changing
  • the MQML in MQYL type
  • apertures of the additional
  • Q7 magnet not modeled but
  • should be the same as Q7,
  • due to same  constraints
  • apertures in the triplet are
  • scaled to 150 mm

* = 2.5 m

2nd joint HiLumi LHC-LARP Annual Meeting, 15 November 2012 Frascati

slide10

COLLISION

2nd joint HiLumi LHC-LARP Annual Meeting, 15 November 2012 Frascati

pre squeeze optics
Pre-squeeze optics

new layout

HL-LHC baseline

  • optimum values of beta’s at crab cavity can be found by optimizing the distance of
  • the outer triplet quadrupoles Q4/Q5/Q6, and optimizing the strength of the new Q7

2nd joint HiLumi LHC-LARP Annual Meeting, 15 November 2012 Frascati

squeeze optics
Squeeze optics
  • possibility to build squeeze
  • optics with the ATS scheme at
  • * =20, 15 cm
  • some sextupoles run at
  • maximum current

*= 15cm

2nd joint HiLumi LHC-LARP Annual Meeting, 15 November 2012 Frascati

squeeze apertures
Squeeze apertures
  • no major aperture problems
  • up to *=15 cm in the
  • MatchingSection magnets
  • Q5 aperture closer to the n1=7
  • limit than the other magnets
  •  can be improved by
  • re-orienting the beam screen
  • apertures in the triplet are
  • scaled to 150 mm

2nd joint HiLumi LHC-LARP Annual Meeting, 15 November 2012 Frascati

crab cavity voltage gain
Crab-cavity voltage gain

possibility to reduce the crab voltage of about 30-40%

2nd joint HiLumi LHC-LARP Annual Meeting, 15 November 2012 Frascati

lattice squeeze ability
Lattice squeeze-ability
  • possibility to build squeeze
  • optics in non ATS mode
  • at *  13 cm
  • chromaticity correction
  • strategy not known yet

* = 14 cm

2nd joint HiLumi LHC-LARP Annual Meeting, 15 November 2012 Frascati

apertures
apertures
  • no aperture problems for the
  • Matching Section magnets
  • apertures in the triplet are
  • scaled to 150 mm

* = 14 cm

2nd joint HiLumi LHC-LARP Annual Meeting, 15 November 2012 Frascati

slide17

CHROMATICS PROPERTIES

2nd joint HiLumi LHC-LARP Annual Meeting, 15 November 2012 Frascati

chromaticity correction
Chromaticity correction
  • the ATS scheme gives good
  • chromaticity correction
  • in the horizontal plane

* = 15 cm

  • the relative tune variation
  • (fractional part) changes from 1%
  • to 2% in the vertical plane

2nd joint HiLumi LHC-LARP Annual Meeting, 15 November 2012 Frascati

geometric aberrations compensation
Geometric aberrations compensation

Detuning with amplitude (IP1, * = 15 cm)

3Qx = 187

4Qy-Qx = 179

3Qx-6Qy = 175

3Qx+6Qy = 549

  • stop band width of the 3Qx resonance is increased
  • new ninth order coupling resonances are excited

2nd joint HiLumi LHC-LARP Annual Meeting, 15 November 2012 Frascati

conclusion outlook
Conclusion & Outlook
  • possibility to reduce crab cavity voltageby 30-40%
  • possibility to gain some lattice flexibility in collision and injection
  •  chromatic correction needs to be tuned
  • work out solutions for injection optics at *  4 m
  • integrate the proposed solution with the new Inner Triplet

2nd joint HiLumi LHC-LARP Annual Meeting, 15 November 2012 Frascati

crab cavity voltage1
Crab cavity voltage
  • reduce the voltage of the crab cavity: V  1/(*)1/2

by increasing the beta functions in Q4

IT

MS-ARC

2nd joint HiLumi LHC-LARP Annual Meeting, 15 November 2012 Frascati

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