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

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!


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.


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 Title

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,

Presentation Title

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


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



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.


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.


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.


Presentation Title

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


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”


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”


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


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


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,

• 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


• 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+


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 Title

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 Title

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

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