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www-project.slac.stanford/ilc/testfac/ESA/esa.html

ILC Beam Tests in End Station A. SLAC EPAC Meeting. January 24, 2006. Collimator design, wakefields (T-480) BPM energy spectrometer (T-474) Synch Stripe energy spectrometer (T-475) IP BPMs/kickers—background studies EMI (electro-magnetic interference).

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  1. ILC Beam Tests in End Station A SLAC EPAC Meeting January 24, 2006 Collimator design, wakefields (T-480) BPM energy spectrometer (T-474) Synch Stripe energy spectrometer (T-475) IP BPMs/kickers—background studies EMI (electro-magnetic interference) http://www-project.slac.stanford.edu/ilc/testfac/ESA/esa.html PAC05 paper/poster: SLAC-PUB-11180, e-Print Archive: physics/0505171

  2. Beam Instrumentation Tests for the Linear Collider using the SLAC A-Line and End Station A http://www.slac.stanford.edu/grp/rd/epac/LOI/LOI-2003.2.pdf • LOI presented at EPAC meeting in Fall 2003. • Today will give an update and status report on this. • We’ve been pursuing this program as a series of • test beam experiments, with funding from • i) SLAC ILC group, ii) UK, iii) DOE LCRD funding. • 3 test beam experiments have been approved and we’ve just completed • a successful 5-day commissioning run earlier this month. • 2 more 2-week runs scheduled before end of July 2006. Plan for 2 2-week • runs in FY07.

  3. T-480: Collimator Wakefields Collimators remove beam halo, but excite wakefields. Goal is to determine optimal collimator material and geometry. These studies address achieving the ILC design luminosity. PIs: Peter Tenenbaum (SLAC), Nigel Watson (U. of Birmingham, UK) Collaborating Institutions: U. of Birmingham, CCLRC-ASTeC + engineering, CERN, DESY, Manchester U., Lancaster U., SLAC, TEMF TU Collimator wakefield box moved from Sector-2 to ESA. 2 sandwiches, each holding 4 collimators, available. Collimators being provided by UK groups. Wakefield kick angle measurements provided by T-474 BPMs.

  4. T-474, 475: Energy Spectrometers Precision energy measurements to 50-200 parts per million are needed for Higgs boson and top quark mass measurements. BPM and synchrotron stripe spectrometers will both be evaluated in a common 4-magnet chicane. These studies address achieving the ILC precision measurement goals. T-474 PIs: Mike Hildreth (U. of Notre Dame), David Miller (UC London, UK) Collaborating Institutions: U. of Cambridge, Royal Holloway, SLAC, UC Berkeley, UC London, U. of Notre Dame T-475 PI: Eric Torrence (U. of Oregon) Collaborating Institutions: SLAC, U. of Oregon • prototype quartz fiber • detector (8 100-micron • fibers + 8 600-micron • fibers w/ multi-anode • PMT readout) is installed • at A-line SLM (synch lite • Monitor) location. • Initially, will use SLAC Linac BPMs. New • electronics based on nanobpm work at KEK, • being developed by UC Berkeley. • New BPMs will be designed at UC London • in collaboration with SLAC experts • Will test ILC Linac BPMs being developed by • C. Adolphsen and G. Bowden

  5. ESA Equipment Layout, including a future 4-magnet chicane 18 feet Jan. 2006 commissioning run: i) 3WAKE1 (T-480), 3WS1 and 3C2 were installed ii) T-474: new BPM electronics were commissioned with existing BPMs iii) T-475: prototype detector commissioned at A-line SLM location iv) new bunch length diagnostics commissioned with rf detectors at a ceramic gap in ESA March 2006: 2 SPEAR girders, 3BPM3-5, 3WS2, 3BPM9-11 will also be installed

  6. Beam Parameters at SLAC ESA and ILC *possible, using undamped beam

  7. IP BPMs/Kickers—background studies Use “spray” beam with Be Target at end of Linac to generate similar flux density and momenta as collision pair background. Measure sensitivity to backgrounds, EMI. Plan to submit test beam proposal ~Feb. 1. (U. of Oxford, SLAC) • EMI Studies • Plan to characterize EMI along ESA beamline using antennas and fast scopes • Measure dependence on bunch charge, bunch length • $14K available from US-Japan funds for FY06 • (KEK, SLAC)

  8. Other Tests being discussed: • 1. BPM test stations • 2. Bunch length and longitudinal profile measurements • electro-optic, Smith-Purcell, coherent transition radiation, other? • Initial measurements are using rf detectors at a ceramic gap in a few • frequency bands from 10GHz-100GHz • 300-micron ILC bunch length is same as LCLS after 1st bunch compressor-- • ESA is a good place to commission diagnostics for this • 3.Spray beam or fixed target to mimic pairs, beamsstrahlung, disrupted beam • for testing synchrotron stripe energy spectrometer, IP BPMs, BEAMCAL • 4. IR Mockup? • Mimick beamline geometry at IP within ±5 meters in z and ±20 cm radially • 5. Single Particles (electrons, photons, pions) • 1-25 GeV particles with 1 or less particles/bunch at 10Hz for ILC Detector tests

  9. Accelerator Scheduling Committee(J. Seeman, Chair) ESA running in FY06: T-469: Nov. 16-18, 2005 (using secondary beams from Be target in Linac) ILC T-474, T-475, T-480: i) Commissioning run – January 4-9, 2006 ii) 2 runs, each 2-week duration, between March-July 2006 Commissioning run held Jan. 4-9 was very successful! ~20 people taking shifts (including 4 grad students) from SLAC, UC Berkeley, Notre Dame, U. of Oregon, UC London, Daresbury Lab

  10. Safety Reviews ESA has now been revalidated for using primary beams. A major consideration was reviewing radiation physics requirements and the ESA PPS (personnel protection system). Additionally, we worked to satisfy requirements for the following safety committees: i) electrical, ii) radiation physics, iii) earthquaking, iv) hoisting & rigging, v) safety overview committee ISMS: safety training and visitor info provided to ILC users—JHAMs, AHAs, STAs are primary means with additional specific walkthru info. ESA work activities co-ordinated with facilty manager, Carsten Hast, and use of “work authorization sheets.”

  11. Radiation Physics and ESA PPS • The ESA PPS does not meet modern standards for redundancy of • sub-system components. Additionally, system components are old and some • are past their rated service life. • In 2002, there was an AIP to replace the ESA PPS, but it was not completed following • the cancellation of the Real Photon Experiments. • The current system has been reviewed by the PPS group, ADSO and independently by • Marc Ross and Keith Jobe as part of the ESA revalidation. The system has no • single-point failures and is safe for primary beam operation, subject to detailed • PPS certification procedures and equipment inspections. PPS certification takes • place prior to each experimental run. • The cost estimate provided by Ray Larsen and Patrick Bong (PPS) for replacing the ESA PPS • Is $500K. This includes a 50% contingency and would use programmable logic controllers (PLCs). • PLCs are new to SLAC PPS but are planned for LCLS PPS work and future upgrades of other • SLAC PPS. Approximately $100-150K of this cost estimate is directly applicable to work needed • for LCLS. • Interim measures: the radiation safety officer has put in place interim measures to ensure • safe operation until the ESA PPS is replaced. We will have another ESA PPS review • in June 2006. • Will be requesting to run with the existing PPS thru the end of FY08 (end of PEP-II era). ESA • running beyond that would require a new PPS.

  12. ESA Beam Tests in LCLS Era? • controls issues • low bunch charge • w/ LCLS gun specs • pulsed magnets to • share LCLS beam

  13. ESA Expenditures and Budget in FY05-FY07 by SLAC’s ILC group

  14. January 2006 Commissioning Run • Infrastructure: • DAQ (both SCP and experimental—evolution from E-166) • Wire scanner for spotsize, emittance measurements • simple bunch length diagnostics w/ 3 rf detectors (10, 20 and 100 GHz) • Energy spread measurements with A-line synch lite monitor (SLM) • A-line commissioning for single bunch, low emittance beams • → full characterization of beam’s 6-dim phase space • T-474: BPM Energy spectrometer commissioning • - new BPM electronics developed at UC Berkeley using existing rf bpms; • SIS waveform digitizers provided by UK • 3. T-475: Synch. Stripe energy spectrometer • - testing Oregon quartz fiber detector at A-Line SLM location • 4. T-480: Collimator Wakefield Measurements, • commissioning ASSET collimator wakefield box; get beam cleanly • thru 4mm gap and take beam-based alignment data

  15. January 2006 Commissioning Run Wire Scanner Collimator wakefield box

  16. January 2006 Commissioning Run Alcove rf BPMs (3 sets of bpm processors to analyze data) 100GHz Bunch Length Detector

  17. January 2006 Commissioning Run Oregon quartz fiber detector at A-line SLM location for T-475 SR photons DAQ Control at Counting House e- beam

  18. LiTrack simulation for achieving ILC parameters in ESA Bunch charge (1E10) 2.0 DR bunch length (mm) 6.0 DR energy spread (%) 0.074 RTL Voltage (MV) 38 RF phase 2-6 (deg) +10 RF phase 10-20 (deg) -17.5 Aline R56 (m) 00.465 Aline T566 (m) 2.744

  19. January 2006 Commissioning Run 2-d scan versus Linac injection phase and compressor voltage

  20. Energy profile with SLM digitized (saturates at peak) 1.2% dE/E January 2006 Commissioning Run 117-micron vertical spot Energy profile with SLM digitized (saturates at peak) 1.2% dE/E Wire scanner measurement of vertical spotsize. Nominal setup had low energy tail. Optimizing Linac injection phase and compressor voltage for short bunches eliminates low energy tail and gives high energy tail.

  21. January 2006 Commissioning Run Linac emittance with S28 wires Q28 and wire scans for measuring horizontal, vertical emittance in ESA x ~ 31. e-05 y ~ 4.0 e-05 • expect ~4x emittance growth in A-line due to synch. radiation • and chromatic aberrations • data was taken with wrong magnet config for A-line orbit • and dispersion matching (→increased y-emittance?) • vacuum problem at start of A-line may also increase y-emittance

  22. January 2006 Commissioning Run T-474 commissioning results using new bpm processors to downmix signals to 70MHz and digitize with SIS waveform digitizers at 100MHz. ~5-micron bpm resolution achieved so far. Expect <1-micron resolution, so studying contributions from phase noise, angle jitter, fitting procedure …

  23. ILC Beam Tests in End Station A Summary • we have a strong collaboration for important ILC beam tests, • addressing ILC luminosity and ILC precision • strong support from SLAC’s ILC group and UK collaborators • 3 test beam experiments have been approved and are in progress; • additional ones are in preparation or under study • successful 5-day commissioning run earlier this month; 2 additional • runs scheduled before end of July. Plans to continue into FY07 and • FY08, parasitic with PEP-II operation.

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