Background comparison between 20 mrad and 2 mr crossings Takashi Maruyama SLAC Machine-Detector Interface Workshop SLAC January 6-8, 2005.

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Presentation transcript:

Background comparison between 20 mrad and 2 mr crossings Takashi Maruyama SLAC Machine-Detector Interface Workshop SLAC January 6-8, 2005

Two Crossing Angle Schemes with SiD Detector 20 mrad2 mrad L* = 3.51 m L* = 4.05 m R =2.5 cm R = 1 cm Geant 3 (e+/e-, photons) and FLUKA (neutrons)

More Geometry BNL Compact SC for QD0 QF1 for 2 mrad crossing Extract beam through coil pocket Spencer’s iron magnet with field map Poletip field: 10.5 kGauss, r=0.5 cm Length: 1.7 m

Background sources Sync radiations from beam halo - 2 mrad crossing Beam-beam pairs –120 K / BX – = 2.7 GeV Radiative Bhabhas –460 K / BX – = 195 GeV  hadrons (Barklow’s new calculation) –  =3.2  10 5 pb (0.77 events/BX) Beam parameters: TESLA TDR for 500 GeV

Beam extraction the 2 mr horizontal crossing scheme Sync radiations hit the face of QF1 RED: halo, upstream quads GREEN: halo, QD0 BLUE: disrupted beam, QD0 Disrupted beam with sync photons Beam can be extracted through QF1 coil pocket. QF1 fringe field ~3 kGauss.

Sync radiations in 2mrad crossing No sync radiations from beam core or disrupted beam would hit QF1. Sync radiations from beam halo hit QF1. QD0 upstream QD0 (MeV) # N/e Hit rate (%) Power (kW) 2.0*f halo 0.78*f halo –Photons backscattered to IP < 200 photons/BX for f halo =10 -3 –Photo-neutrons (FLUKA) < 1  10 8 neutrons/cm 2 /yr for f halo = Energy (MeV) From QD0From upstream QD0 f halo : halo fraction We really don’t know.

Pairs at Z = 315 cm r 2 cm X (cm) 20 mrad 2 mrad

Pairs in two schemes 20 mrad2 mrad QD0 QF1 QD0 QF1 < 40 GeV e+/e- hit LUMON or QD0 QD1

Energy Deposition 20 marad2 mrad

Neutron flux at Z = 0 cm (FLUKA) 20 mrad Pairs: 3.6  10 8 n s /cm 2 /yr Rad. Bhabhas: 1.1  10 8 n s /cm 2 /yr 2 mrad Pairs: 2.3  10 8 n s/ cm 2 /yr 20 mrad 2 mrad Neutron source (cm) M1 QD0 QF1 Beam pipe R at Z = 0 cm Energy (MeV)

Conclusions Background seems tolerable for both crossing angle schemes. More pair-energy will be deposited in –LUMON for 20 mrad –QD0 for 2 mrad. Similar neutron flux at 2-4  10 8 /cm 2 /yr