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
Afternoon session starts at 1:00 PM!
Dinner: 7pm Hunan Garden Restaurant, Palo Alto.
Mauro Pivi SLAC, ESTB Users Meeting August 2012, SLAC
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
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
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
LCLS uses 1/3 of
SLAC LINAC
End Station A
Presentation Title
Page 7
LCLS and ESA
Use pulsed magnets in the beam switchyard to send
beam in ESA.
Presentation Title
Page 9
ESA Experimental Area
Beam
ESTB Beam Dump
10
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%!
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!
ESTB parameters
Parameters
ESA
Energy
Repetition Rate
15 GeV
0.25 nC
Charge per pulse
5 Hz
0.35 nC
Energy spread, sE /E
0.02%
Bunch length rms
100 mm
Emittance rms (gex,gey)
(4, 1) 10-6 m-rad
Spot size at waist (sx,y)
< 10 mm
Drift Space available for experimental
apparatus
Transverse space available for
experimental apparatus
60 m
5x5m
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.
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.
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
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
17
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
ESTB Status: Personal Protection System
A new Personal Protection System (PPS) has
been built in ESTB
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
ESTB commissioning during LCLS
Machine Development MD studies
ESTB commissioning during LCLS MDs:
• July 11th from 6-8PM (only A-line)
• July 25th from 8-11PM
• August 1st from 4:30 PM to next day 2 AM
• August 4th from 8 AM to next day ~12:30 AM
Energy spread of LCLS Beam on LTU
Wire 246
Beam
Parameters
Units
Energy
4.7
GeV
Charge
150
pC
Bunch length
150
fs
Energy
spread
2.39e-4
See lcls e-log: http://physics-elog.slac.stanford.edu/lclselog/index.jsp
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.
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
Next LCLS beam pulse is not disturbed
Signals on the Beam Position Monitor
downstream of kicker: 10 LCLS beam
pulses are kicked out of 120 pulses
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
25
Carsten Hast SLAC, ESTB Users Meeting August 2012, SLAC
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
26
ESA Past Experiments
Wakefield box
Wire Scanners
“IP BPMs” T-488
18 feet
T-487: long. bunch profile
rf BPMs
Ceramic gap
for EMI studies
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
27
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 & T475 measurements in ESA
• See M. Hildreth presentation and
poster @ tour of ESA
Mauro Pivi SLAC, ESTB Users Meeting August 2012, SLAC
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
Jerry Va’vra’s focusing DIRC Tests
•
•
•
•
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
Beam spot: s < 1mm
Lead glass:
Local START time:
s ~36ps
Carsten Hast, SLAC, Test Beams in the US, October 2010, FNAL
30
Received Beam Test Proposals
Peter Gorham, Hawaii U.
Howard Matis, LBNL
Philippe Granier, SLAC
Ray Frey, Oregon U.
Mike Hildreth, Notre Dame U.
Leo Greiner, LBNL
Bruce Schumm, UC Santa Cruz
J. Resta Lopez et al, U. Spain
Mike Rooney
Elliott Bloom, SLAC
Askaryan Effect
STAR upgrade
ATLAS detector
LC detector
ILC energy spectrometer
STAR Pixel Detector
ILC Radiation Damage
CLIC collimator wakefield
SuperB DCH
Fermi telescope
Mauro Pivi SLAC, ESTB Users Meeting August 2012, SLAC
Received
Received
Received
Received
Received
Received
Received
Received
Intent
Intent
ESTB Potential Users*
Detector R&D
Accelerator R&D
*Source: Test Beam Proposals and “Discussion and Conclusions” at ESTB Workshop http://www-conf.slac.stanford.edu/estb2011/default.asp?id=program
Experiment
Energy
Rep Rate
Test
Duration
LC Energy Spectrometry, Mike Hildreth, Notre Dame U.
max available
5 Hz
2 weeks
CLIC Wakefield Collimator Studies, Roger Jones, Cockroft U.
~10-14GeV
5 Hz
2 weeks
Askaryan Effect in Energy Showers, Prof. Peter Gorham,
Hawaii U.
max available
5 Hz +
1 week, 24
h/day
Beamcal SR Damage Study, Bruce Schumm, UC Santa Cruz
max available
max
2 weeks
Pixel Sensors for ATLAS Upgrades, Philippe Greiner, SLAC
max available
5 Hz +
2 weeks
Radiation Physics Beam Tests, Mario Santana, SLAC
4-13.6 GeV
5 Hz
1 week
LC Silicon-Tungsten Calorimeter , Ray Frey, University of
Oregon
1 GeV to
maximum
5 Hz +
2 weeks
Super-B R&D Jerry Va’Vra, SLAC
10 GeV
5 Hz
SSD Electronics for STAR HFT, Howard Matis LBNL
> 3 GeV
5 Hz
2 weeks
STAR Pixel Detector, Leo Grenier LBNL
MIP
N/A
1 week
Fermi Large Area Telescope, Elliott Bloom, SLAC
photon at 40400MeV
5 Hz
W powder SciFi fiber calorimeter, H. Huang (H. Matis) LBNL
1 - 10 GeV
discussion
1 week
g-2 experiment detector tests, Chris Polly, Fermilab
1 – 4 GeV
5Hz +
not yet specified
Total
16 weeks
ESTB Potential Users* continue
Detector R&D
*Source: Test Beam Proposals and “Discussion and Conclusions” at ESTB Workshop http://www-conf.slac.stanford.edu/estb2011/default.asp?id=program
Experiment
Energy
Rep Rate
Test
Duration
SuperB DCH prototype, Mike Rooney UVIC
--
--
not yet specified
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.
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
Commissioning the “A-line” and ESTB
Franz Joseph not affecting LCLS
photon rate plot
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
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.
ESTB Stage II: Hadron beam line
Scale to beam
current 0.25nC
Presentation Title
Page 39
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!
Additional availability: BYKIK “On”
Number of pulses per hour parked on BYKIK dump in
December, 2010. About ~5% additional availability to
ESTB/ESA.
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
LCLS beam energy
Number of days LCLS was operating at a
given beam energy during April -July 2012