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News from eRHIC Matt Lamont, Thomas Ullrich , William Foreman, Anders Kirleis , Michael Savastio , Peter Schnatz Elke Aschenauer and the CAD- eRHIC Team. ERL-based eRHIC Design. 5 mm. 5 mm. 5 mm. 5 mm. 20 GeV e -beam. 16 GeV e -beam. Common vacuum chamber. 12 GeV e -beam. - PowerPoint PPT Presentation
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News from eRHIC
Matt Lamont,Thomas Ullrich,
William Foreman,Anders Kirleis,
Michael Savastio,Peter Schnatz
Elke Aschenauerand the CAD-eRHIC Team
E.C. Aschenauer
E.C. Aschenauer
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STAR
PHENIX
2 x 200 m SRF linac4 (5) GeV per pass5 (4) passes
Polarized e-gun
Beamdump
4 to 5 vertically separatedrecirculating passes
Cohe
rent
e-
cool
er
5 mm
5 mm
5 mm
5 mm
20 GeV e-beam16 GeV e-beam
12 GeV e-beam
8 GeV e-beam
Com
mon
vac
uum
ch
ambe
r
Gap 5 mm total0.3 T for 30 GeV
eRHICdetector
MeRHIC
detector
10-20 GeV e x 325 GeV p 130 GeV/u Au
possibility of 30 GeV @low current operation
ERL-based eRHIC Design
Medium Energy eRHIC Concept
E.C. Aschenauer
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Geometrical constraints: If it is possible use the existing interaction region at RHIC 2 o’clock and wider tunnel to place the superconducting linac inside it. Minimize civil construction cost and re-use for eRHIC already built and installed linac.
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IR-Design for MeRHIC IP-2
E.C. Aschenauer
no synchrotron shielding included allows p and heavy ion decay product tagging IP-2 height beam-pipe floor 5’-8” (with digging ~10’)
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Zeus @ HERA I
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Zeus @ HERA II
E.C. Aschenauer
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Hera I vs Hera II
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The Alan Caldwell detector
E.C. Aschenauer
e
p
HadronicCalorimeter
EM CalorimeterSi tracking stations
Compact – fits in dipole magnet with inner radius of 80 cm.Long - |z|5 m
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The Alan Caldwell detector
E.C. Aschenauer
2x14 Si tracking stations
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First ideas for a detector concept
E.C. Aschenauer
/ TRD
Dipol3Tm
Dipol3Tm
Solenoid (4T)
ZDC
FPDFED
// //
r: 5 ft / 1.5m
~15m
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Drift Chambers central trackingala BaBar
E.C. Aschenauer
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ToDo listoptimize magnetic fields
do we need 4T for solenoid and 3Tm for dipole what radiation length can we tolerate low Q2
optimize distance Dipole to Solenoidimpact of beam lines through the detector on physicsneed to optimize acceptance at low scattering angle
need acceptance down to 1o
finalize code to write root-trees
E.C. Aschenauer
Start immediately at 12o’clock
12:00 experimental area
