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Welcome!

Welcome!. Mauro Pivi SLAC, ESTB Users Meeting August 2012, SLAC. hope: by the end of today…. Mauro Pivi SLAC, ESTB Users Meeting August 2012, SLAC. Workshop Information. Tour of End Station A at 11:00 AM: Let’s gather here outside at 10:50 AM We will walk to the site

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Welcome!

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  1. Welcome! Mauro Pivi SLAC, ESTB Users Meeting August 2012, SLAC

  2. hope: by the end of today… Mauro Pivi SLAC, ESTB Users Meeting August 2012, SLAC

  3. Workshop Information • Tour of End Station A at 11:00 AM: • Let’s gather here outside at 10:50 AM • We will walk to the site • Afternoon session starts at 1:00 PM! • Dinner: 7pm Hunan Garden Restaurant, Palo Alto. Mauro Pivi SLAC, ESTB Users Meeting August 2012, SLAC

  4. ESTB End Station Test Beam Design, Performance, Infrastructure, Status Mauro Pivi and Carsten Hast SLAC on behalf of ESTB/ESA Team ESTB 2012 Users Meeting, SLAC August 23, 2012

  5. SLAC End Station A Test Beam (ESTB) • Test beam activities have been interrupted by ending PEP II operation and start of LCLS • • ESTB will be a unique HEP resource • - World’s only high-energy primary electron beam for large scale Linear Collider MDI and beam instrumentation studies • - Exceptionally clean and well-defined secondary electron beams for detector development • - Huge experimental area, good existing conventional facilities, and historically broad user base • - Upgradable with Neutron and other hadrons beam lines Mauro Pivi SLAC, ESTB Users Meeting August 2012, SLAC

  6. ESTB proposal R. Erickson, T. Fieguth, C. Hast, J. Jaros, D. MacFarlane, T. Maruyama, Y. Nosochkov, T. Raubenheimer, J. Sheppard, D.Walz, and M. Woods, “ESTB proposal” July 2009 L. Keller, myself joined 2010

  7. LCLS uses 1/3 of SLAC LINAC End Station A Presentation Title Page 7

  8. LCLS and ESA Use pulsed magnets in the beam switchyard to send beam in ESA.

  9. ESA LCLS A-Line BSY Presentation Title Page 9

  10. Beam ESA Experimental Area ESTB Beam Dump

  11. LCLS beam parameters and range • LCLS beam • Energy: 2.5 –15 GeV • Repetition rate: 120Hz • Beam current: up to 350 pC • 40-150 pC preferred by LCLS Users • Beam availability ~95%!

  12. ESTB parameters • ESTB beam • Kick the LCLS beam into ESA @ 5 Hz • Primary beam 2.5 -15 GeV • Determined by LCLS • < 1.5 x 109 e-/pulse = 250 pC • Clean secondary electrons • From 2 GeV to 15 GeV, 0.1/pulse to 109 e-/pulse • If LCLS experiments don’t need full 120 Hz rate, the remaining beam is directed to ESTB, increasing the rate > 5 Hz!

  13. ESTB parameters 0.25 nC

  14. ESTB goals: Primary e- beam operations • ESTB can operated in several modes. • In full beam operation mode: • A full intensity, high energy e- beam can be delivered to ESA • The beam is brought to a focus in the middle of ESA sz~100um, ten times larger than LCLS due to large bend angle in the A-line.

  15. ESTB goals: Secondary e- beam • Primary beam can be directed onto a target: • Secondary e- are momentum-selected • Transported to ESA and focused to small spots • Adjusting 2 existing collimators, it is possible to provide secondary beams up to incident energy and down to 1 single particle/pulse.

  16. ESTB Status • Built new PPS system • Installed new Beam Dump • Installed 2 pulsed kicker magnets in the beam switch yard to allow: • 5 GeV full intensity or secondary beams down to 1 single particle/pulse (limited to 5 GeV by A-line bend magnet power supply) • Ongoing commissioning the “A-line” and ESA by this winter • Planning: installation of remaining 2 new kickers and power supplies by early 2013 to upgrade to 15 GeV Beam

  17. ESTB Status: Pulsed Kicker Magnets • 2 new pulsed magnets including ceramic vacuum chambers have been installed to kick the LCLS beam with up to 8 GeV and 120 Hz into ESTB • We are planning to install 2 additional magnets to allow kicking the full energy 15 GeV beam into ESTB Mauro Pivi SLAC, ESTB Users Meeting August 2012, SLAC

  18. Pulsed Kicker Magnets in the Beam Switch Yard to divert LCLS beam into ESA Overview of Beam Switch-Yard area Recently installed pulsed kicker magnets Planning to install 2 more magnets to allow 15 GeV beam into ESTB

  19. ESTB Status: Personal Protection System A new Personal Protection System (PPS) has been built in ESTB

  20. ESTB Status: New Beam Dump A beam dump system has been previously installed that allows 150 W beam into ESA Now upgrading to 3 kW beam dump

  21. ESTB commissioning during LCLS Machine Development MD studies • ESTB commissioning during LCLS MDs: • July 11th from 6-8PM (only A-line) • July 25thfrom 8-11PM • August 1st from 4:30 PM to next day 2 AM • August 4th from 8 AM to next day ~12:30 AM

  22. Energy spread of LCLS Beam on LTU Wire 246 See lcls e-log: http://physics-elog.slac.stanford.edu/lclselog/index.jsp

  23. Beam Successfully Extracted into A-line • June 6th: • 3.5 GeV LCLS beam to middle of A-line • No diagnostics downstream, so beam not observed passed this monitor. Setting up more diagnostics in the A-line.

  24. Beam extraction: no effect on next LCLS beam pulse Main kicker signal Negative compensation LCLS 120 Hz, Kicker at 10 Hz • Eddy currents in kicker vacuum chamber may affect next beam pulse • Pulse compensation in kicker reverses Eddy currents in vacuum chamber Signals on the Beam Position Monitor downstream of kicker: 10 LCLS beam pulses are kicked out of 120 pulses Next LCLS beam pulse is not disturbed

  25. ESTB commissioning: Secondary Beam Operation • We operated the LCLS beam between 3.5 GeV and 6.75 GeV leaving A-line at 3.5 GeV • Inserting a thin screen before the A-line bend we scattered primary LCLS beam • We saw very nice signals of secondary electrons at the ESTB beam dump (end of ESA) • Scintillator counters and Lead glass block signals • With PMT Voltages as low as 1.4kV (nominal 1.7kV) we saw huge signal at ESA dump • That means 1000+ particles made it to the dump Carsten Hast SLAC, ESTB Users Meeting August 2012, SLAC

  26. ESA Infrastructure Available InstrumentationTrigger counters Halo veto counters High resolution beam hodoscope Particle ID (Cerenkov, TOF, shower counter) Small, high field solenoid sturdy support table with remote movers Cranes 15 and 50-ton cranes available

  27. Wakefield box Wire Scanners “IP BPMs” T-488 rf BPMs Ceramic gap for EMI studies 18 feet T-487: long. bunch profile Dipoles + Wiggler BPM energy spectrometer (T-474/491) Synch Stripe energy spectrometer (T-475) Collimator design, wakefields (T-480) Bunch length diagnostics (T-487) Smith-Purcell Radiation IP BPMs—background studies (T-488) LCLS beam to ESA (T490) Linac BPM prototypes EMI (electro-magnetic interference) Irradiation Experiments ESA Past Experiments

  28. Energy Spectrometer chicane and wiggler • At ILC, precision of 100-200 ppm are needed for determination of particle masses, t and Higghs. • Chicane for BPM and SR stripe energy spectrometer T-474 & T-475 measurements in ESA • See M. Hildreth presentation and poster @ tour of ESA Mauro Pivi SLAC, ESTB Users Meeting August 2012, SLAC

  29. Collimator Wakefields • Collimators remove halo particles • Concern: short range wakefields • Tests: optimal materials and geometry to minimize wakefields • T-480, see tour @ ESA • “Wakefield box” allows swapping of collimators and adjusting jaw aperture • measured wakefield kick to the beam by downstream BPMs

  30. Jerry Va’vra’s focusing DIRC Tests Beam spot: s < 1mm Lead glass: • SLAC 10 GeV/c 2nd electrons • Beam enters bar at 90º angle • Prototype is movable to 7 beam positions along bar. • Time start from the LINAC RF signal, but correctable with a local START counter Local START time: s ~36ps Carsten Hast, SLAC, Test Beams in the US, October 2010, FNAL

  31. Received Beam Test Proposals Mauro Pivi SLAC, ESTB Users Meeting August 2012, SLAC

  32. ESTB Potential Users* *Source: Test Beam Proposals and “Discussion and Conclusions” at ESTB Workshop http://www-conf.slac.stanford.edu/estb2011/default.asp?id=program Accelerator R&D Detector R&D Total 16 weeks

  33. ESTB Potential Users* continue *Source: Test Beam Proposals and “Discussion and Conclusions” at ESTB Workshop http://www-conf.slac.stanford.edu/estb2011/default.asp?id=program Detector R&D

  34. ESTB Team Carsten Hast, Mauro Pivi, John Jaros Design, installation: Dieter Walz, Alev Ibrahimov Optics: Ted Fieguth, Lew Keller Kickers: Tony Beukers Radiation Physics: Ludovic Nicolas, Stan Mao Consulting: Takashi Maruyama and Mike Woods PPA: David MacFarlane Thanks K. Jobe, J. Nelson, D. McCormick, Carl Hudspeth Thanks to LCLS colleagues and operators, Rick Iverson, Matt Boyes et all.

  35. Summary • We are excited to re-start ESA test beams! • - Unique High energy test beam line in the US, with plenty of infrastructures and SLAC support for Users • Built PPS system and new Beam Dump • We installed 2 kicker magnets for e- beams in ESTB with commissioning by the Winter • 5 GeV full intensity or secondary beams down to 1 single particle/pulse • First ESTB User run in January 2013 • Installation of 2 additional kickers over Christmas for 15 GeV beams • Parameters determined by LCLS. Availability 5Hz. Some opportunities to increase rate when not needed for LCLS. Mauro Pivi SLAC, ESTB Users Meeting August 2012, SLAC

  36. Commissioning the “A-line” and ESTB Franz Joseph not affecting LCLS photon rate plot

  37. Short bunch length: development • Interest to short bunches (CLIC, accelerator R&D,etc) • LCLS ultra-short bunch length: 10 mm and smaller • In ESA, bunch length increases to 100 mm due to strong bends and large (optics) R56 • 20-30 mm bunch length are possible by installing 4 additional existing quadrupoles. • Thus, it is possible to preserve ultra-short bunches in ESA with funding by interested parties … Presentation Title Page 37

  38. ESTB Stage II: Hadron beam line • For ESTB Stage II, • a secondary target upstream of ESA and • a beamline diverging at 1.35 degrees wrt straight ahead beamline (see more: Carsten Hast talk) • will provide a secondary hadronbeamline in ESA, with: • p produced at rate 1/pulse for 0.25nC beam. Rate can be farther reduced. • Protons and Kaons at ~ 0.02/pulse. • Cherenkov and time-of-flight detectors, which can tag the produced hadron cleanly.

  39. ESTB Stage II: Hadron beam line Scale to beam current 0.25nC Presentation Title Page 39

  40. Tagged photon beam in ESA GLAST tests • A secondary e- beam is momentum-selected in the A-line and incident on a thin radiator in ESA. The scattered electron energy is measured in a calorimeter (Pb glass), tagging the photon energy: • capability exists but needs infrastructure • we should determine user need first • Does anybody (really) want this? Let us know!

  41. Number of pulses per hour parked on BYKIK dump in December, 2010. About ~5% additional availability to ESTB/ESA. Additional availability: BYKIK “On”

  42. Pulsed Kicker Magnets in the Beam Switch Yard to divert LCLS beam into ESA Overview of Beam Switch-Yard area Beryllium target downstream of kicker magnets

  43. LCLS beam energy Number of days LCLS was operating at a given beam energy during April -July 2012

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