TESLA R&D: Forward Region Achim Stahl DESY Zeuthen Cracow Tel Aviv Minsk Prague Colorado Protvino UC...
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Transcript of TESLA R&D: Forward Region Achim Stahl DESY Zeuthen Cracow Tel Aviv Minsk Prague Colorado Protvino UC...
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TESLA R&D: Forward Region
Achim Stahl
DESY Zeuthen
CracowTel AvivMinskPrague
ColoradoProtvino
UC LondonDubna
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GeVThe Forward Region
maximum hermiticity precision luminosity shield tracking volumne monitor beamstrahlung
TDR design
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GeVThe Forward Region
maximum hermiticity precision luminosity monitor beamstrahlung shield tracking volumne
small bunches high electric fields huge beamstrahlung
≈ 20 TeV per side
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Proposal: 2-Year R&D Program
Instrumentation of the very forward region
LumCal
Design & Simulation
Exp. LimitationsPhysics Needs
BeamCal
Lab Tests & Simulation
Identify most suitable technology
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Lumi: Detector Requirements
Goal: ΔL/L: 10-4 (exp.) ΔL/L: 10-4 (theo.)
Ref: OPAL (LEP) ΔL/L: 3.4 x 10-4 (exp.) ΔL/L: 5.4 x 10-4 (theo.)
LumCal
LumCalIP
< 4.5 μm
< 0.7 mm
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LumCal Design
TDR design: ΔL/L 10-4 impossible
cut-off 5 MeV
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New Design
LumCal
LumCal
BeamCal
BeamCal
LumCal
BeamCal
LumCal
BeamCal
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Lumi Simulations
Full detector simulationEvent reconstruction
center-of-gravity algorithm
necessary segmentation: 32 rings in polar angle 48 sectors in azimuth 30 segments in depth
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Lumi SimulationsRealistic Monte Carlo rad. corrections (BHWIDE) beamstrahlung (CIRCE) full detector simulation reconstruction of events
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Laser Alignment SystemNew collaborator: Jagiellonian Univ. Cracow Photonics Group
Work just started:
reconstruction of Ne-Ne laser spot on CCD camera
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Substantial effort to improve predictionGoal: complete, massive 2-loop calculation
Bhabha Cross Section: Theory
Collaboration:Tord Riemann with
Jochem FleischerJanusz GluzaAlejandro LorcaOleg TarasovAnja Werthenbach
Good progress: 1-loop done (in SM) working FORTRAN code 2-loop: |1-loop|2 + |Born x 2-loop|2 |1-loop|2 near to finished numerically 2-loop under study, some progress real corrections: interest from Jadach/Waş
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GeVBeam Monitoring
Beamstrahlung is sensitiveto the machine parameters e+e- pairs in BeamCal photons downstream
Advantage of cold technology:
large bunch spacinginformation can be used for feedback
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nominal our precision Beam Diag.
Bunch width x Ave.
Diff.
553 nm 1.2 nm
2.8 nm
~ 10 %
~ 10 %
Bunch width y Ave.
Diff.
5.0 nm 0.1 nm
0.1 nm
Shintake
Monitor
Bunch length z Ave.
Diff.
300 μm 4.3 μm
2.6 μm
~ 10 %
~ 10 %
Emittance in x Ave.
Diff.
10.0 mm mrad 1.0 mm mrad
0.4 mm mrad
?
?
Emittance in y Ave.
Diff.
0.03 mm mrad 0.001 mm mrad
0.001 mm mrad
?
?
Beam offset in x
Beam offset in y
0
0
7 nm
0.2 nm
5 nm
0.1 nm
Horizontal waist shift
Vertical waist shift
0 μm
360 μm
80 μm
20 μm
None
None
First Results (over optimistic!)detector: realistic segmentation, ideal resolutionsingle parameter analysis, bunch by bunch resolution
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Hermeticity: 2-photon-vetoSimulation: identify electrons close to the beam in the presence of large beamstrahlung
min. detectable energy: 100 GeV for 250 GeV beam
analysis with realistic beam background including ground motion & feed back
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Technologies for BeamCal
Sandwich: W / Si
Sandwich: W / diamond
Sandwich: W / gas ionisation chambers
Xtals with ultrathin phototriodes
Xtals with fiber readout
radiation hardness ?
next slides
good progress, better suited for -detection?
waiting for funding (UK)
no funding @ DESY, looking for new collaborator
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Gas Calo: Beamtestssampling calorimeter tungsten absorbers gas ionisation chambers
extreme radiation hardnessdetect beamstrahlung on downstream collimator
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Diamond Sensors12 samples (12 x 12 mm) Frauenhofer Inst. Freiburg
measured: I-V characteristics charge collection distanceto be done: homogeniety
1st mono-crystal (2 x 3 mm) Almazot / Minsk
under investigation
expect diamonds from Dubna soon
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Sensor R(Average) ccd Up
500Vccd Up
800Vccd Down
500Vccd Down
800V
11 4.60E+13 37 35
12 3.20E+14 27 30 35 43
13 8.88E+11 21 25 33
21 5.92E+14 17 24
22 7.39E+14 9 10 (700V) 9 11
23 3.93E+14 10 13 9 12
31 1.04E+11 33 (400V) 28
32 5.12E+13 50 50 57
33 4.63E+13 52 58 49 54
41 5.12E+11 48 45 (400 V)
42 4.35E+14
43 5.24E+13 60 65 54
Ch
arg
e C
ollecti
on
Dis
tan
ce
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Conclusions
Good progress in most areas