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LPK June 2006. Status of Headon Design Changes since August 2005. Shorter Final Doublet : a) Larger bore, shorter SC magnets results in smaller losses in the FD. b) Separator closer to IP results in acceptable parasitic bunch crossing spacing at 46 m.

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LPK

June 2006

Status of Headon Design Changes since August 2005

  • Shorter Final Doublet:

    a) Larger bore, shorter SC magnets results in smaller losses in the FD.

    b) Separator closer to IP results in acceptable parasitic bunch crossing spacing

    at 46 m.

  • Separator Electric Field Reduced to Below LEP Operating Field:

    Allows larger gap between plates resulting in smaller losses in the separator.

  • Create Space for High Power Intermediate Dump:

    a) Concentrates extracted beam and beamstrahlung losses mostly at

    one place and allows room for shielding to protect nearby components and

    the environment.

    b) Incoming beam magnets QF3, QD2B, and B2 have smaller apertures.

    c) This dump is modeled after the aluminum/water 2 MW energy slit in the SLAC

    A-line.



Plan View of Zero Degree Extraction Showing Beamstrahlung Collimation

B2

B1

B1

B2

B2

sep

γdump

QF3

QD2B

sep

5 mr dipole

septum

Int.

Dump

QD2A


Elevation View of Zero Degree Extraction Showing Beamstrahlung Collimation

B1

B1

B2

B2

B2

sep

PC

Int.

Dump

Beamstr.

Dump

QF3

QD2B

sep

QD2A


Power Lost, Beamstrahlung CollimationNominal Parameter Set, 500 GeV CM

(kW)

dy = 200 nm


Power Lost, Beamstrahlung CollimationLow P Parameter Set, 500 GeV CM

(kW)

dy = 120 nm

can eliminate loss on

separator plates with

a larger plate gap


Separator breakdown during the bunch train Beamstrahlung Collimation

(dipole remains on)

Outgoing bunches: 0.5 mrad bend becomes 0.25 mrad bend. Bunches go backward

through the incoming beamline and hit the intermediate dump.*

Incoming bunches: 0 mrad bend becomes 0.25 mrad bend. Bunches pass through the

IP region < 1 cm from the beam axis, go backward through

the incoming beamline and hit the intermediate dump.*

* The intermediate dump must absorb ≈ 40 bunches before the remainder of the bunch

train is switched to the tuneup dump.


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