Hybrid synchrotron arc 2 d ipoles p er half cell cold at f
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Hybrid Synchrotron Arc: 2 D ipoles p er Half Cell, Cold at F. J. Scott Berg Advanced Accelerator Group Meeting 21 July 2011. Basic Structure of Machine. Hybrid synchrotron using fixed cold and warm ramped dipoles to get High average bending field Extremely fast ramping

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Hybrid Synchrotron Arc: 2 D ipoles p er Half Cell, Cold at F

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Hybrid synchrotron arc 2 d ipoles p er half cell cold at f

Hybrid Synchrotron Arc:2 Dipoles per Half Cell, Cold at F

J. Scott Berg

Advanced Accelerator Group Meeting

21 July 2011


Basic structure of machine

Basic Structure of Machine

  • Hybrid synchrotron using fixed cold and warm ramped dipoles to get

    • High average bending field

    • Extremely fast ramping

  • Accelerate 375 GeV to 750 GeV

  • 8 straights for RF, injection, extraction, etc.

J. S. Berg: 2 Dipoles, Cold at F


Basic arc cell structure

Basic Arc Cell Structure

  • FODO cell, quads split in two

    • Eventually have sextupole in middle

    • Currently zero length nothing with drifts around it

  • 75 cm drifts between magnets

  • Cold 8 T dipole near F

  • Warm ramped dipole near D, −1.8 to +1.8 T

  • Quadrupoles ramped, maximum pole tip 1.3 T

J. S. Berg: 2 Dipoles, Cold at F


Basic arc cell structure1

Basic Arc Cell Structure

Cold

Warm

D

Warm

Cold

J. S. Berg: 2 Dipoles, Cold at F


Optimization process

Optimization Process

  • Find closed orbit at 375 GeV with warm dipoles at −1.8 T, 750 GeV with warm dioples at +1.8 T

  • Set tunes to desired values, times of flight equal using quad fields and cold dipole length

  • Minimize excursion with warm dipole length

  • Adjust quadrupole lengths so pole tip fields low enough

J. S. Berg: 2 Dipoles, Cold at F


Results and analysis

Results and Analysis

  • Results look awful, but intentionally non-optimal lattice structure

    • Should have more dipoles per cell

    • Probably better with cold dipole near D

  • Look at how excursions, circumference depend on number of arc cells

  • Only up to 8 cells/superperiod so far

J. S. Berg: 2 Dipoles, Cold at F


Ring circumference arcs only

Ring Circumference (Arcs Only)

J. S. Berg: 2 Dipoles, Cold at F


Maximum orbit excursion

Maximum Orbit Excursion

J. S. Berg: 2 Dipoles, Cold at F


Results and analysis1

Results and Analysis

  • Orbit excursion improving rapidly with more arc cells

  • Circumference reduces, surprisingly

    • Quads must get longer for large excursion

  • Circumference prefers medium horizontal tune, low vertical tune

  • Excursion likes both tunes high, horizontal more so

J. S. Berg: 2 Dipoles, Cold at F


Results and analysis2

Results and Analysis

  • Excursions shown are in D; much lower in F

  • Probably better with warm dipole near F

  • Excursions very high

    • Know we should have more dipoles per cell

  • Circumference higher than Tevatron tunnel

    • Only arcs at this point!

    • Not sure if this will improve with more dipoles

    • Could reduce energy range

J. S. Berg: 2 Dipoles, Cold at F


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