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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

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

slide3
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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