Welcome! Mauro Pivi SLAC, ESTB Workshop March 2011, SLAC

Workshop Logistics If you didn’t already, please: Pick-up badges Sign-up for End Station A tour with Naomi. Sign up and give Naomi $45 for the dinner restaurant. Need a count. do these during the coffee break! Mauro Pivi SLAC, ESTB Workshop March 2011, SLAC

Workshop Logistics ESA tour: Let’s gather here outside We will use vans Afternoon session starts at 1:30pm! Dinner: 7pm Hunan Garden Restaurant, Palo Alto. Mauro Pivi SLAC, ESTB Workshop March 2011, SLAC

ESTB End Station Test Beam Design, Performance, Infrastructure, Status Mauro Pivi SLAC National Accelerator Laboratory on behalf of ESTB/ESA team ESTB 2011 Workshop, SLAC March 17, 2011

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 -Secondary hadron beams available as an upgrade Carsten Hast, SLAC, Test Beams in the US, October 2010, FNAL

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

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

LCLS and ESA Use pulsed magnets in the beam switchyard to send beam in ESA. Mauro Pivi SLAC, ESTB 2011 Workshop, Page 8

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Carsten Hast, SLAC, Test Beams in the US, October 2010, FNAL10 ESA Experimental Area Beam

LCLS beam parameters and range LCLS beam –Energy: 3.5 –13.6 GeV –Repetition rate: 120Hz –Beam current: 20 to 250 pC 150 pC preferred by LCLS Users – Hz has been provided This is the current upper limit for the present cathode –Beam availability ~95%! See also next presentation by Rick Iverson Mauro Pivi SLAC, ESTB 2011 Workshop

ESTB parameters ESTB beam –Kick the LCLS beam into 5 Hz –Primary beam GeV Determined by LCLS <1.5 x 10 9 e-/pulse –Clean secondary electrons Up to 13.6 GeV, 0.1/pulse to 10 9 e-/pulse Mauro Pivi SLAC, ESTB 2011 Workshop

ESTB parameters 0.25 nC ParametersBSYESA Energy13.6 GeV Repetition Rate5 Hz Charge per pulse0.25 nC Energy spread,  E  /E 0.058% Bunch length rms 10  m280  m Emittance rms (  x  y ) (1.2, 0.7) m-rad(4, 1) m-rad Spot size at waist (  x,y  - < 10  m Drift Space available for experimental apparatus -60 m Transverse space available for experimental apparatus -5 x 5 m Mauro Pivi SLAC, ESTB 2011 Workshop

Carsten Hast, SLAC, Test Beams in the US, October 2010, FNAL14 Kicker Magnets 4 new kicker magnets including power supplies and modulators and vacuum chambers are designed and components are being ordered and manufactured Build new PPS system and install new beam dump

ESTB Stage I: Primary e- Beam operations ESTB can operated in several modes. In Stage I: A full intensity, high energy e- beam can be delivered to ESA The beam is brought to a focus in the middle of ESA  x ~  y ~7um.  z =280um factor 28 larger than LCLS due to large R56 in A-line.

ESTB Stage I: 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. Mauro Pivi SLAC, ESTB 2011 Workshop

ESTB Stage I: Secondary e- beam (Left) Spectrum of secondary e- beam from 13.6 GeV primary beam and (Right) transmission rate over each collimator. Adjusting 2 collimators, down to 1 e- /pulse. Mauro Pivi SLAC, ESTB 2011 Workshop

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 hadron beamline in ESA, with:  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. Mauro Pivi SLAC, ESTB 2011 Workshop

Presentation Title Page 20 ESTB Stage II: Hadron beam line Scale to beam current 0.25nC

Tagged photon beam in ESA 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 GLAST tests Mauro Pivi SLAC, ESTB 2011 Workshop Does anybody (really) want this? Let us know!

The complete 4 kickers system will not be ready until the end-of-summer. We adopt a short-term solution and plan to install during this down time: 1 Kicker magnet with stainless steel chamber Beryllium target System designed for 60 Hz, might work at 120 Hz Short-term plan: “Pre-Stage I” Mauro Pivi SLAC, ESTB 2011 Workshop

In this configuration, we either steer the: 4 GeV full intensity LCLS beam into ESA GeV primary beam into target and generate secondary e- beam to ESA, 0.1/pulse to 10 9 /pulse. Short-term plan: “Pre-Stage I” Mauro Pivi SLAC, ESTB 2011 Workshop

Short- and Long-Term Plans 24 Stage I. Primary beam and single electron operations. Primary LCLS beam Installation of the full 4 kicker magnet system to direct the LCLS beam in ESA. Production of secondary electron beam down to 1 e- / pulse. Operational in November 2011 Stage II. Hadrons Beam Line Hadrons beam line Installation of a secondary beam line at for the production of hadrons in ESA. Currently Not funded November 2011 by 2012 Mauro Pivi SLAC, ESTB 2011 Workshop

25 ESA Infrastructure Available Instrumentation Trigger 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 Carsten Hast, SLAC, Test Beams in the US, October 2010, FNAL

26 18 feet Wakefield boxWire Scannersrf BPMs T-487: long. bunch profile “IP BPMs” T-488 Ceramic gap for EMI studies 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 Dipoles + Wiggler ESA Past Experiments

Mauro Pivi ESTB 2011 Workshop, Page 27 At ILC, precision of ppm are needed for determination of particle masses,  and Higghs. Chicane for BPM and SR stripe energy spectrometer T-474 & T- 475 measurements in ESA See M. Hildreth presentation and tour of ESA Energy Spectrometer chicane and wiggler

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

Carsten Hast, SLAC, Test Beams in the US, October 2010, FNAL29 SLAC 10 GeV/c 2 nd 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  ~36ps Local START time: Beam spot:  < 1mm Lead glass: Jerry Va’vra’s focusing DIRC Tests

Peter Gorham, Hawaii U.Askaryan EffectReceived Howard Matis, LBNLSTAR upgradeReceived Philippe Granier, SLACATLAS detectorReceived Ray Frey, Oregon U.LC detectorReceived Mike Hildreth, Notre Dame U.ILC energy spectrometerReceived Leo Greiner, LBNLSTAR Pixel DetectorReceived Mike RooneySuperB DCHIntent Elliott Bloom, SLACFermi telescopeintent Received Beam Test Proposals

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 We install a short-term system for e-beams in ESTB with commissioning by the Summer - 4 GeV full intensity or 13.6 GeV secondary e- beams down to 1 single particle/pulse Installation of the full 4 kickers system by November - First ESTB run in November / December Beam parameters determined by LCLS. Availability 5Hz. Some opportunities to increase rate when not needed for LCLS. Hadron beam line needs funding  p K e+ Mauro Pivi SLAC, ESTB 2011 Workshop

Additional availability: BYKIK “On” Upstream of the LCLS undulator, BYKIK kicker is used to park the beam out of the beam line. When BYKIK turns “ON”, the A- line kickers will also fire “ON” to re-direct the LCLS beam in ESTB A-line  ESTB If LCLS experiments don’t need full 120 Hz rate, the remaining beam is parked out by BYKIK.

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

Presentation Title Page 36 Short bunch length: development Interest to short bunches (CLIC, accelerator R&D,etc) LCLS ultra-short bunch length: 10  m and smaller In ESA, bunch length increases to 280  m due to strong bends and large (optics) R56 Possible to preserve ultra-short bunches in ESA with adequate $ support by interested parties … With existing optics:  m bunch length are possible if one manages to reduce R56 by a factor 3-4 and keep  E =0.02%.

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