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, SLACMarch 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 TitlePage 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
Presentation TitlePage 9
ESA
A-LineLCLS
BSY
Carsten Hast, SLAC, Test Beams in the US, October 2010, FNAL 10
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
– 350 pC @ 120Hz 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 ESA @ 5 Hz– Primary beam 4 -13.6 GeV
• Determined by LCLS• <1.5 x 109 e-/pulse
– Clean secondary electrons• Up to 13.6 GeV, 0.1/pulse to 109 e-/pulse
Mauro Pivi SLAC, ESTB 2011 Workshop
ESTB parameters
0.25 nC 0.25 nC
Parameters BSY ESA
Energy 13.6 GeV 13.6 GeV
Repetition Rate 5 Hz 5 Hz
Charge per pulse 0.25 nC 0.25 nC
Energy spread, sE /E 0.058% 0.058%
Bunch length rms 10 mm 280 mm
Emittance rms (gex,gey) (1.2, 0.7) 10-6m-rad (4, 1) 10-6 m-rad
Spot size at waist (sx,y) - < 10 mm
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, FNAL 14
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
sx~sy~7um. sz=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:
• 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.
Mauro Pivi SLAC, ESTB 2011 Workshop
Presentation TitlePage 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.
• 4 - 13.6 GeV primary beam into target and generate secondary e- beam to ESA, 0.1/pulse to 109/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 lineInstallation of a secondary beam line at for the production of hadrons in ESA.
Currently Not funded
November 2011by 2012
Mauro Pivi SLAC, ESTB 2011 Workshop
25
ESA Infrastructure
Available InstrumentationTrigger countersHalo veto countersHigh resolution beam hodoscopeParticle ID (Cerenkov, TOF, shower counter)Small, high field solenoidsturdy support table with remote movers
Cranes 15 and 50-ton cranes available
Carsten Hast, SLAC, Test Beams in the US, October 2010, FNAL
Carsten Hast, SLAC, Test Beams in the US, October 2010, FNAL 26
18 feet
Wakefield box Wire Scanners rf 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 prototypesEMI (electro-magnetic interference)Irradiation Experiments
Dipoles + Wiggler
ESA Past Experiments
Mauro Pivi ESTB 2011 Workshop, Page 27
• 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
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 tour @ 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, FNAL 29
• 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
s ~36ps
Local START time:
Beam spot: s < 1mm
Lead glass:
Jerry Va’vra’s focusing DIRC Tests
Peter Gorham, Hawaii U. Askaryan Effect Received
Howard Matis, LBNL STAR upgrade Received
Philippe Granier, SLAC ATLAS detector Received
Ray Frey, Oregon U. LC detector Received
Mike Hildreth, Notre Dame U. ILC energy spectrometer Received
Leo Greiner, LBNL STAR Pixel Detector Received
Mike Rooney SuperB DCH Intent
Elliott Bloom, SLAC Fermi telescope intent
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 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, 2010. About ~5% additional availability to ESTB/ESA.
Additional availability: BYKIK “On”
Presentation TitlePage 36
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 280 mm 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: 20-30 mm bunch length are possible if one manages to reduce R56 by a factor 3-4 and keep sE=0.02%.
Presentation TitlePage 37
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