Ps2 injection extraction layout
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PS2 Injection/Extraction Layout. Wolfgang Bartmann PS2 Meeting, 23-May 07. Outline. Aims Optics in LSS Space Requirements – Injection H - -Injection – Lorentz stripping and Septum geometry Space Requirements – Extraction/Beam dump Conclusion of space requirements

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PS2 Injection/Extraction Layout

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Ps2 injection extraction layout

PS2 Injection/Extraction Layout

Wolfgang Bartmann

PS2 Meeting, 23-May 07


Outline

Outline

  • Aims

  • Optics in LSS

  • Space Requirements – Injection

  • H--Injection – Lorentz stripping and Septum geometry

  • Space Requirements – Extraction/Beam dump

  • Conclusion of space requirements

  • Fitting Injection/Extraction together

  • Next steps

PS2 Meeting: Inj/Extr Layout


Ps2 injection

Aims

  • Injection:

    • Fast Injection

    • H--Injection

  • Extraction:

    • Fast Extraction

    • Resonant Extraction

    • Low-loss 5 turn continuous transfer

    • Beam dump (assumed internal)

PS2 Meeting: Inj/Extr Layout


Fodo lattice lss

FODO Lattice - LSS

Betafunctions and Dispersion in the LSS:

  • betx, bety < 42 m

  • Dx < 10 cm

PS2 Meeting: Inj/Extr Layout


Space requirements injection 1

Space Requirements: Injection (1)

  • Fast Inj. needs one cell. We see no special issues with this system.

  • H--Inj. is limited due to Lorentz Stripping:

    For energies up to 3.5 GeV, the field strength in dipoles must not exceed 0.14 T (2.4 · 10-5 loss/m) which corresponds to a maximum deflection of ~ 9 mrad/m;

    Field at 75 mm offset in quadrupoles does not exceed these limits (at injection energies!).

PS2 Meeting: Inj/Extr Layout


H inj lorentz stripping

H- -Inj: Lorentz stripping…

  • Can parameterize formula for lifetime in magnetic field

    • t = a/E x exp(b/E)

      Where t = lifetime, a~4x10−14 s-MV/cm, b~44 MV/cm and E is Lorentz-transform of the magnetic field B (E [MV/cm] = 3.20 p [GeV/c] x B [T]).

  • Rule of thumb : p x B ≤ 0.6 - 0.7 GeV/c x T

  • More exactly: for PS2 injection at 4.8 GeV/c (4 GeV kinetic) should keep fields below 0.13 - 0.15 T (corresponds to about 10-3 loss per m of field)…gain x10 in loss at fixed B at 3.5 GeV!

PS2 Meeting: Inj/Extr Layout


H inj lorentz stripping total losses

H--Inj: Lorentz Stripping –total losses

  • Need to aim for 10-3 total loss

    • Few 10-4 per element/system

    • Bend angles were assumed at 200 mrad…

    • Maximum bend about 9 mrad/m (3.5 GeV)

    • Would need ~20 m of injection septum!!!!

  • In one FODO ½ cell have ~ 10 m free drift

    • Assume 8 m magnetic length for septum

    • Maximum deflection is then ~ 70 mrad.

PS2 Meeting: Inj/Extr Layout


Space requirements injection 2

Space Requirements: Injection (2)

H--Inj. in FODO structure:

  • Injecting in one halfcell (~11.3 m free drift) with several septa reaches a displacement of about 0.57 m at the quadrupole.

  • Going through the coil window of the enlarged quadrupole avoids large septum kicks but needs one halfcell more.

  • H--Inj. occupies 1.5 to 2 cells

  • Space requirement for injection: 2.5 to 3 cells

  • PS2 Meeting: Inj/Extr Layout


    H inj injection septum geometry

    H--Inj: Injection septum geometry

    570 mm

    60 mm

    2.0 m, 18.0 mrad

    Difficult (but maybe not impossible!) to get past upstream

    quad yoke and into the downstream quad aperture.

    PS2 Meeting: Inj/Extr Layout


    H inj injection septum geometry coil window alternative

    H--Inj: Injection septum geometry‘coil window’ alternative

    300 mm

    60 mm

    2.0 m, 7.5 mrad

    Less bending angle, but the first meters of the halfcell before are needed, too.

    PS2 Meeting: Inj/Extr Layout


    Space requirements extraction

    Space Requirements: Extraction

    • the three extraction systems need 4.5 cells according to the conceptual design (Jan 07)

    • rearrangement of the elements in the extraction and placing the extraction kicker in the dispersion suppressor gives a requirement of three cells in the LSS

      Problems:

      • larger apertures in the dipoles

      • less flexibility in the design of the dispersion suppressor

    S

    S

    PS2 Meeting: Inj/Extr Layout


    Space requirements beam dump

    Space requirements: Beam dump

    ~2 m

    Vertical plane…

    Internal dump block

    at about 40 mm aperture

    Dump kickers filling one half-cell

    (~ 2.5 mrad needed at 50 GeV)

    Vertical has some advantages:

    - smaller beam size at injection means block closer to orbit  lower kick

    Needs to fit into long injection/extraction straight section….

    - infrastructure, radiation

    PS2 Meeting: Inj/Extr Layout


    Conclusion of space requirements

    Conclusion of space requirements

    • Injection:2.5 to 3.0 cells

    • Extraction: 3.0 cells (4.0 total)

    • Dump:1.0 cell

    • Total:6.5 to 7.0 cells

    PS2 Meeting: Inj/Extr Layout


    Optimum fitting together with present lattice

    Optimum (?) fitting togetherwith present lattice

    Fast Injection

    H--Injection

    Extraction

    DS

    InjK

    InjS

    H0S

    H-InjS

    MTEBK

    MS2

    MS1

    ES

    MTEBK

    ExtK

    6 cells

    • No room for beam dump

    • Kicker in Dispersion Suppressor

    PS2 Meeting: Inj/Extr Layout


    Options for inj extr straight without using the ds

    Options for inj/extr straightwithout using the DS

    Fast Injection

    H--Injection

    Extraction

    Beam Dump

    InjK

    InjS

    H0S

    H-InjS

    MTEBK

    MS2

    MS1

    ES

    MTEBK

    BD

    DuK

    ExtK

    InjK

    InjS

    H0S

    H-InjS

    MTEBK

    MS2

    MS1

    ExtK

    MTEBK

    BD

    DuK

    ES

    7 cells

    PS2 Meeting: Inj/Extr Layout


    Next steps

    Next steps:

    Iterate Inj/Extr Layout Versions

    • Designing the arc as an achromat saves one cell per arc (cell length is shorter)  7 LSS cells

    • Use different cell structure in the LSS, e.g. Doublet

    • Increase dipole strength in the arc in order to gain one cell more for the LSS (7 cells) for same circumference

    • More detailed H- -injection design!

    PS2 Meeting: Inj/Extr Layout


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