NLC - The Next Linear Collider Project Machine-Detector Interface Tom Markiewicz LC R&D Opportunities, SLAC May 21, 2002

Tom Markiewicz NLC - The Next Linear Collider Project Machine Detector Interface

Tom Markiewicz NLC - The Next Linear Collider Project -20m < Issues < 200m Backgrounds Simulations Final Doublet Magnet Technology Vibration Stabilization IR Layout Instrumentation (L,E,& P + other) Vibration Sources: measurement & modeling  IR Issues

Tom Markiewicz NLC - The Next Linear Collider Project Backgrounds IP Backgrounds: Beam-Beam Interaction Disrupted primary beam Extraction Line Losses Beamstrahlung photons e+,e- pairs from beams.  interactions Hadrons from beams.  interactions Radiative Bhabhas Machine Backgrounds: Synchrotron Radiation Muons Production at collimators Direct Beam Loss Beam-Gas Collimator edge scattering Neutron back-shine from Dump Experts: Takashi Maruyama/SLAC Lew Keller/SLAC Jeff Gronberg/LLNL Stan Hertzbach/U.Mass Programs: Guinea Pig / CAIN GEANT 3 / GEANT 4 EGS / FLUKA TRANSPORT / DIMAD / TURTLE MUCARLO QSRAD

Tom Markiewicz NLC - The Next Linear Collider Project Background Simulation Results

Tom Markiewicz NLC - The Next Linear Collider Project Background Projects Iterate all results for consistent set of results –Beam parameters, detectors, solenoid design, beamlines not consistent Detector response to known backgrounds –TPC, Cal, Lum, Pol, etc. Dose calculations on SC or REC QD0 Collimator scattering study: –Locations, apertures, beam loss, … GEANT4 beamline model  -Hadron production …

Tom Markiewicz NLC - The Next Linear Collider Project Simulations Experts: Peter Tenenbaum/SLAC Andrei Seryi/SLAC

Tom Markiewicz NLC - The Next Linear Collider Project Simulation Projects At SLC/SLD LUMINOSITY and BACKGROUNDS dominated EXPERIMENTAL daily concern I am sure last factor of will be a struggle at the next LC There are an infinite number of Monte Carlo-like studies that can be made to understand luminosity loss mechanisms and ways to ameliorate them. Repeat background studies for ”real” machine with non- ideal alignment, magnet settings, ground motion, … Tolerance parameter study

Tom Markiewicz NLC - The Next Linear Collider Project Final Doublet Magnet Technology MagnetApertureGradientRmaxZ_ipLength QD01.0 cm144 T/m5.6cm3.81 m2.0m QF11.0 cm36.4 T/m2.2cm7.76 m4.0 m Experts: Andy Ringwall/SLAC-PEP3 Brett Parker/BNL

Tom Markiewicz NLC - The Next Linear Collider Project Magnet R&D Topics Permanent –Radiation hardness –Temperature sensitivity –Tuning schemes –Effect of solenoid fringe field: B Z, B R, F Z –Incorporate beam pipe & vacuum system Superconducting –Temperature load from e+e- pairs, SR, leads, support –Field stability: appropriate sensor Flowing Helium External connections –Mechanical rigidity against vibration –Vibration sensors / actuators appropriate inside / outside cryostat

Tom Markiewicz NLC - The Next Linear Collider Project Inertial Vibration Stabilization Projects Sensor design Algorithms Simple 3m pseudo-magnet test Relative motion of two blocks Experts: Joe Frisch/SLAC Linda Hendrikson/SLAC Tom Himel/SLAC Eric Doyle/SLAC Leif Ericksson/SLAC

Tom Markiewicz NLC - The Next Linear Collider Project Interferometric Vibration Stabilization Experts: Tom Mattison/UBC Mike Woods/SLAC

Tom Markiewicz NLC - The Next Linear Collider Project IP Girder Test Concept STS2 Witness IFO.A. IF 7m.5m 4.5m –Support tube (Carbon fiber?) –Permanent magnet or model –Interaction with external solenoid field –Hard or soft actuators –Beam pipe & vacuum

Tom Markiewicz NLC - The Next Linear Collider Project IP Feedback Projects Experts: Phil Burrows/Oxford Gavin Nesom/Oxford Simon Jolly/Oxford Glenn White/Oxford Colin Perry/Oxford Joe Frisch/SLAC Steve Smith/SLAC NLCTA Improvements: Better beam conditions Better hardware, DAQ, … Solid State Kicker Other sites: ATF (KEK) PePII

Tom Markiewicz NLC - The Next Linear Collider Project IR Design Experts: Tom Markiewicz/SLAC Knut Skarpaas/SLAC

Tom Markiewicz NLC - The Next Linear Collider Project Realistic IR Layout Masking Support VXD support & alignment Instrumented Masks Lum_Pair Mon Vacuum req. REC QD0 SC QD0 Beampipe support Apertures Optical lines of sight Detector access

Tom Markiewicz NLC - The Next Linear Collider Project Instrumentation Lum, Energy & Pol Instrumentation (to be) addressed by MikeWoods & Eric Torrence Other: –Halo Monitor: Need a good idea SLD/SLC: Ran a wire or collimator edge into the beam and looked at CDC & Calorimeter response

Tom Markiewicz NLC - The Next Linear Collider Project Vibration Sources: Measurement & Modeling Example of integrated spectra of absolute (solid lines) and relative motion for 50m separation obtained from the models Importance of this topic to stable luminosity makes it important part of the EXPERIMENTAL program and DETECTOR design Participate in current measurements Sites Equipment Noise Design of IR that mitigates and minimizes man-made sources ANSYS sims of detector Industrial vib. suppression tools applied to HEP Experts: Andrei Seryi/SLAC Fred Asiri/SLAC

Tom Markiewicz NLC - The Next Linear Collider Project  IR Issues Experts: Jeff Gronberg/LLNL David Asner/LLNL Ken Skulina/LLNL Jim Early/LLNL

Tom Markiewicz NLC - The Next Linear Collider Project  IR Projects Mercury Laser Project –Fusion R&D, comes for free IR Optics –½ NLC Scale, suitable for LINX/SPHINX is being built Test laser beam diagnostics and control with low power laser –Beam Tests: Laser=? Beam=SLC ? Engineering Tests: –Collision stability –Luminosity as function of particle/spin combination –Two photon hadronic backgrounds Physics Measurements