Machine-Detector Interface

Transcription

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

2 Machine Detector Interface 500 GeV TRC Optics w/ Large Detector

3 -20m < Issues < 200m Backgrounds Simulations Final Doublet Magnet Technology Vibration Stabilization IR Layout Instrumentation (L,E,& P + other) Vibration Sources: measurement & modeling γγ IR Issues

4 Backgrounds IP Backgrounds: Beam-Beam Interaction Disrupted primary beam Extraction Line Losses Beamstrahlung photons e+,e- pairs from beams. γγ interactions Hadrons from beams. γγ 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

5 NLC - The Next Linear Collider Project Background Simulation Results

6 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 γγ-hadron production

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

8 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 nonideal alignment, magnet settings, ground motion, Tolerance parameter study

9 Final Doublet Magnet Technology Experts: Andy Ringwall/SLAC-PEP3 Brett Parker/BNL Magnet Aperture Gradient Rmax Z_ip Length QD0 1.0 cm 144 T/m 5.6cm 3.81 m 2.0m QF1 1.0 cm 36.4 T/m 2.2cm 7.76 m 4.0 m

10 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

11 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

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

13 IP Girder Test Concept 4.5m m 7m Witness IF 7m Support tube (Carbon fiber?) Permanent magnet or model Interaction with external solenoid field Hard or soft actuators Beam pipe & vacuum O.A. IF STS2 STS2 STS2 STS2 STS2

14 IP Feedback Projects BPM Kicker Amp IP Round + Trip Delay BPM Processor NLCTA Improvements: Better beam conditions Better hardware, DAQ, Solid State Kicker Other sites: ATF (KEK) PePII Experts: Phil Burrows/Oxford Gavin Nesom/Oxford Simon Jolly/Oxford Glenn White/Oxford Colin Perry/Oxford Joe Frisch/SLAC Steve Smith/SLAC

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

16 Realistic IR Layout Masking Support GeV TRC Optics w/ Large Detector VXD support & alignment Instrumented Masks Lum_Pair Mon Vacuum req. REC QD0 SC QD0 Beampipe support -0.2 Apertures Optical lines of sight Detector access

17 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

18 Vibration Sources: Measurement & Modeling 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 Integrated rms motion, nm "Model A" "Model B" "Model C" 1E-4 1E Frequency, Hz Example of integrated spectra of absolute (solid lines) and relative motion for 50m separation obtained from the models

19 γγ IR Issues X (meters) Final Focus Mirror Experts: Jeff Gronberg/LLNL David Asner/LLNL Ken Skulina/LLNL Jim Early/LLNL M1 M2 Light Path QD0 Extraction Line Z (meters from IP)

20 γγ 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