CompactPhotonSource

Stage-2modeling

B.Wojtsekhowskiforthecollabora?on

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γ-Source

29/26/17

1.2µA e- γ

e-

8.8 GeV

Beam Dump in the magnet

B ~ 1.5T

3cm NH3

Distance to target ~200 cm photon beam diameter on target ~0.9 mm

Initial MC simulation shows acceptable background rate on SBS and NPS Detailed analyses of radiation level are in progress

2mm hole

fromtheNovember2014talkattheNPSmee?ng

10%X0

B.Wojtsekhowski

fromthetechnoteforthe2015WACSproposal

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4

Distance to target ~200 cm photon beam diameter on target ~0.9 mm

3 mm x 3 mm hole 2 mm x 2 mm raster

Current model of the γ-Source

W-powder

Radiator

Cu-core

2.7 µA e-

11 GeV

10%X0

B ~ 3.2 T

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5

Distance to target ~200 cm photon beam diameter on target ~0.9 mm

3 mm x 3 mm hole

Current model of γ-Source

Cu-core

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6

Distance to target ~200 cm photon beam diameter on target ~0.9 mm

3 mm x 3 mm hole

Current model of γ-Source

Cu-core

9/26/17 B.Wojtsekhowski

Newdevelopments

1.  Therasteris2mmx2mm(requirespol.targetrota?on)2.  ThemagnetpoleisshapedtoboostBfieldto3.2T->lengthreduc?on

whichallowslongerfrontshieldandawedgedabsorber.3.  CentralabsorberofCuhas1.9xbeVerheatconduc?vity,4.2xlonger

radia?onlengththanW-Cu(20%)alloy.4.  W-powderexternalshield(16g/cm3density)forbeVershield.5.  Gradual“stepped”openingofthebeamlineforrad.leakreduc?on6.  Shieldingrequirementlogic:theradia?onfromthesourceshouldbe

afew?meslowerthanfromthephotonbeaminterac?onwiththematerialofapolarizedtarget.

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Graphical view of changes in the source

W-powder

Cu-core

2.7 µA e- 11 GeV

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Cufillerin100cmlongmagnet

Fe-shield

1.2 µA e- 8.8 GeV

W-Cufiller40cmlongmagnet

Concreteshell

W-Cu-core

2015model 2017model

9

Cu-core

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Magnet3Dview

Viewofthemagnet

Viewofthemagnet

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Fieldprofilesalongxandz

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Bvs.XatdifferentZ Bvs.ZatX=Y=0

Tracks1GeVand11GeV

Rangeofthebeamentrance(for11GeV)totheCuabsorber

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Externalshield-1

M2_Box_A_1_W-powder.pngshowsalldimensionsandloca?onoftheouterTungstenshielding

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Externalshield-2

M2_Box_A_2_Exclusion_1_top_view.pngshowsalldimensionsandloca?onoftheexclusionfromBoxAneededforthemagnet.

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Externalshield-3

M2_Box_A_2_Exclusion_1.pngshows3Dandalldimensionsandloca?onoftheexclusionfromBoxAneededforthemagnet.

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Externalshield-4

M2_Box_A_3_Exit-1.pngshowsalldimensionsandloca?onoftheexclusionfromBoxAneededforthebeamline.

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Externalshield-5

M2_Box_A_4_Exit-2.pngshowsalldimensionsandloca?onofthesecondexclusionfromBoxAneededforthebeamline.

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Externalshield-6

M2_Box_A_5_Exclusions_3D.pngshowsallvolumeswhichneedtobeexcludedfromtheExternalshieldbox.

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Coreshielding-1

M2_Box_B_1_W-core.pngshowsalldimensionsandloca?onofthecoreshieldinglocatedinsidethemagnetandmadefromW-Cu(20%)alloy.Theexclusionsneedtobemadefor:a)coilsb)polesc)Cu-coreinsertd)beamopening(3mmx3mm).

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Coreshielding-2

M2_Box_B_2_W-core_3D-view.pngshowsallthatisleioftheW-core.

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Coreshielding-3

M2_Box_B_3_W-core_exclusions.pngshowslistofexclusionsfromasimplebox–thepoles,thecoppercoreandbeamopening.

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Beamopening-1

M2_Box_C_1_Beam_opening.pngshowsdimensionsofthebeamchannel–a3mmx3mmhole.

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Cu-core-1

M2_Box_D_1_Cu-core.pngshowsdimensionsoftheCubeamabsorber(ini?albox).

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Cu-core-2

M2_Box_D_2_Cu-core_exclusions.pngshowsthelistofexclusionsfromtheCu-coreini?albox–poles(Box_E)andBeamopening(Box_C).

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Cu-core-3

M2_Box_D_3_Cu-core_3D.pngshowsa3DviewoftheCucore.

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Pole-1

M2_Box_E_Pole_3D.pngshowsa3Dviewofthemagnetpole

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Pole-2

M2_Box_E_Pole_Side-view.pngshowsasideviewofthemagnetpole

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Pole-3

M2_Box_E_Pole_start.pngshowsdimensionsofthemagnetpoleini?albox

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Pole-4

M2_Box_E_Pole_Top-view.pngshowsdimensionsofthemagnetpole

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Pole-5

M2_Box_E_Pole_Trims.pngisshowingdimensionsofthemagnetpoletrimsandapole?p

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Pole-6

M2_Box_E_Pole_Z-view.pngshowsdimensionsofthepoleandapole?p

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Pole-7

M2_Box_E_Pole_Sweep_back.pngshowsdimensionsofthepolesweep-backcorrec?on

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Pole-8

M2_Box_E_Pole_Tip-plate.pngshowsdimensionsofthepole?pini?albox

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Pole-9

M2_Box_E_transla?on.pngshowsthesizeanddirec?on(x)ofthepoletransla?on

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Magnet-1

M2_Box_F_Side-plate.pngshowsthedimensionsofthemagnetsideplate

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Magnet-2

M2_Box_F_Top-plate.pngshowsthedimensionsofthemagnettopplate

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Coil-1

M2_Coil_dimensions.pngshowsthedimensionsofthemagnetcoil

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Drawings1

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Drawings2

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