IP Beam Instrumentation R&D and Testbeams for the ILC

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Presentation transcript:

IP Beam Instrumentation R&D and Testbeams for the ILC Mike Woods, SLAC ECFA ILC Study at Durham, Sept. 2, 2004 IPBI and (very) Forward Detector R&D Luminosity and Luminosity Spectrum Energy and Energy Spread Polarization Electron ID for 2-photon veto (described in Section 3.1 of the Report on Worldwide Linear Collider Test Beam Effort) ECFA ILC Study, Sept. 2004

Beam Instrumentation R&D in Europe EUROTeV Work Package 5: Beam Diagnostics includes laserwire, nano-BPMs, luminosity, energy, polarization Work Package 2: Beam Delivery System includes IP Beam Stabilization Feedback, crab cavities UK LC-ABD (Lincar Collider – Accelerator Beam Delivery) Includes many of the Beam Diagnostic and BDS components of the EUROTeV Work Package items (very) Forward Region Instrumentation Collaboration and Workshops: http://www-zeuthen.desy.de/~astahl/Collaboration.html http://www-zeuthen.desy.de/www_users/workshops/lcdet/ (5th workshop was just held at DESY-Zeuthen last week; plenary talk on this later today) These programs lead to a need for development of prototypes and access to testbeam facilities. Some of this is already underway. (ex. FONT IP Beam Stabilization beam tests have already taken place at SLAC’s NLCTA and the ATF at KEK; future tests at TTF are desirable.) ECFA ILC Study, Sept. 2004

Beam Instrumentation R&D in Asia at KEK ATF in Japan Laser Wire (beam spotsize and emittance, energy spread) Rf cavity BPM (nanoBPM collaboration) IP Beam stabilization with FONT/FEATHER ECFA ILC Study, Sept. 2004

Beam Parameters at KEK ATF, SLAC ESA and ILC Repetition Rate 1.56 Hz (6.25 Hz max) 10 Hz 5 Hz Energy 1.3 GeV 28.5 GeV 250 GeV e- Polarization - 85% >80% Train Length 60 ns up to 400 ns 1 ms Microbunch spacing 2.8 ns 20-400 ns 337 ns Bunches per train 20 2 2820 Bunch Charge 1.0 x 1010 2.0 x 1010 Energy Spread 0.1% 0.15% ECFA ILC Study, Sept. 2004

Beam Instrumentation Tests for the Linear Collider using the SLAC A-Line and End Station A Y. Kolomensky University of California, Berkeley J. Hauptman, O. Atramentov Iowa State University E. Gulmez,† E. Norbeck, Y. Onel, A. Penzo* University of Iowa D. J. Miller University College London R. Arnold, S. Hertzbach, S. Rock University of Massachussets M. Hildreth University of Notre Dame E. Torrence University of Oregon J. Clendenin, F.-J. Decker, R. Erickson, J. Frisch, L. Keller, T. Markiewicz, T. Maruyama, K. Moffeit, M. Ross, J. Turner, M. Woods SLAC W. Oliver Tufts University G. Bonvicini, D. Cinabro Wayne State University SLAC-LOI-2003.2 27 physicists 10 institutions †also Bogazici University, Istanbul, Turkey *also INFN Trieste, Italy ECFA ILC Study, Sept. 2004 http://www.slac.stanford.edu/grp/rd/epac/LOI/LOI-2003.2.pdf

First IPBI Beam Tests Proposed to SLAC Energy BPMs (T-474 submitted) U. of Notre Dame, UC Berkeley, UC London, U. of Cambridge, SLAC - Mechanical and electrical stability at 100-nm level - BPM triplet at z = 0, 2.5 and 5.0 meter spacing. BPMs 1 and 3 define straight line. Monitor BPM2 offset over time scales of minutes, hours - 2 adjacent BPMs to test electrical stability, separate from mechanical Synchrotron stripe diagnostics (T-475 submitted) U. of Oregon, SLAC - test chicane scheme with wiggler magnet - characterize detector (quartz fiber / other) performance and capabilities Pair detectors (T-476 submitted) Molecular Biology Consortium, U. of Hawaii, Tohoku U., Brunel U., CERN - use “spray” beam of ~ 4-GeV electrons to mimic pair background - test speed (at nano-second level) of both 3-d and planar Si - characterize detector response to “pair background”; can vary spray beam energy and absorber thickness in front of detector plane - use MonteCarlo to superimpose 250 GeV electron to determine electron id efficiency ECFA ILC Study, Sept. 2004

Overview of Proposed Layout for T-474, T-475, T-476 Future T-476 T-474 T-475 ECFA ILC Study, Sept. 2004

Other IPBI Beam Tests Possible in ESA 1. IP BPMs (necessary for fast inter-train and intra-train feedbacks) - Sensitivity to backgrounds, rf pickup - Mimic LC geometry, including fast signal processing (but no feedback) - Sample drive signal to kickers 2. Tests with short bunches (~100-300 mm possible) - EMI for beam instrumentation or Detector electronics - collimator wakefield tests 3. Single Particles (electrons, photons, pions) - 2-25 GeV particles with 1 or less particles/bunch at 10Hz for LC Detector test beams 4. Fixed target to mimic beamsstrahlung and disrupted beam - for synchrotron stripe energy spectrometer - for IP BPM tests IR Mockup - Mimick beamline geometry at IP within +-5 meters in z and ECFA ILC Study, Sept. 2004

Outlook IP Beam Instrumentation is a critical aspect of the Machine-Detector Interface. IPBI should be considered as one of the Detector subsystems – measurements of luminosity, energy, polarization (and electron ID at small polar angles for 2-photon veto) are critical for the ILC physics program. IPBI R&D Efforts are well underway in all 3 regions. There is an identified and growing need to develop prototypes, which need access to test beam facilities. At SLAC, a Letter-of-Intent for LC Beam Instrumentation Tests in ESA was submitted to SLAC in Fall 2003 and presented to the SLAC EPAC. Response from the EPAC and the SLAC Director was very positive. First 3 Test Beam Requests have been submitted to SLAC and cost estimates have been made. Requesting a run in June 2005. Currently waiting for SLAC response as we go thru evaluation of SLAC’s efforts for ILC (I expect a positive response). ECFA ILC Study, Sept. 2004