1. End Station A Test Beam ESTB Design, Performance, Infrastructure, Status
Mauro Pivi, SLAC
on behalf of the ESTB team: C. Hast, T. Beukers T. Fieguth, R. Iverson, J. Jaros, L. Keller, L. Nicolas, T. Maruyama, D. Walz and M. Woods
SiD Workshop, SLAC
December 14-16, 2011

2. Mauro Pivi SLAC, SiD Workshop, Dec 2011
SLAC End Station A Test Beam (ESTB)
ESA 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
Mauro Pivi SLAC, SiD Workshop, Dec 2011

3. 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 and myself joined end of 2010

4. Underlines the broad interest by the community
ESTB Workshop at SLAC
1st ESTB User Workshop in March 2011
50 participants from 16 institutions and 5 countries
13 short presentations for proposed test beam uses
8 requests received (already before the workshop)
Underlines the broad interest by the community 4

5. LCLS uses 1/3 of SLAC LINAC
End Station A
Presentation Title
Page 5

6. Mauro Pivi SLAC, SiD Workshop, Dec 2011
LCLS and ESA
Use pulsed magnets “kickers” in the beam switchyard to send LCLS beam to ESA 6
Mauro Pivi SLAC, SiD Workshop, Dec 2011

7. Carsten Hast, SLAC, ESA Test Beam
LCLS
ESA
A-Line
BSY
Carsten Hast, SLAC, ESA Test Beam

8. Building 61: ESA
Beam

9. Open area for Detector R&D tests with secondary beams

10. End Station A Experimental Area10

11. Mauro Pivi SLAC, SiD Workshop, Dec 2011
LCLS and ESTB Beams
LCLS beam
Energy: 3.3 –14.7 GeV
Repetition rate: 120Hz
Beam current: 250 pC
150 pC preferred by LCLS Users these days
Hz has been provided
This is the current upper limit for the present cathode
Approved to 600 pC running.
Beam availability > 95%!
ESTB beam
Kick the LCLS beam into ESA
Repetition Rate: 5 Hz
Primary beam GeV
Determined by LCLS
< 1.5 x 109 e-/pulse (250 pC)
Clean secondary electrons
1 GeV to 14.7 GeV, from 0.1 e-/pulse to 109 e-/pulse
Mauro Pivi SLAC, SiD Workshop, Dec 2011 11

12. Mauro Pivi SLAC, ESTB 2011 Workshop
ESTB parameters
0.25 nC
Parameters
BSY
ESA
Energy
14.7 GeV
Repetition Rate
120 Hz
5 Hz
Charge per pulse
0.25 nC
Energy spread, sE /E
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

13. Additional Availability Extra 5% of beam time at 120Hz (!) possible
If LCLS experiments don’t need full 120 Hz rate, the remaining beam is parked out
Upstream of the LCLS undulator, “BYKIK” kicker is used to park the beam out of the beam line.
A-line  ESTB
When BYKIK turns “ON”, the BSY kickers will also fire “ON” to re-direct the LCLS beam in ESA
Extra 5% of beam time at 120Hz (!) possible 13

14. ESTB Goals: Primary and Secondary beams
Primary e- beam operations
Full intensity, 4 – 14.7 GeV, LCLS beam into ESA
Secondary e- beams
4 – 14.7 GeV, up to 10-4 momentum resolution
1 GeV (maybe) and 2 GeV (most likely)
Adjusting 2 collimators: electrons/pulse
Tagged photon beams
developing the needed infrastructure
Mauro Pivi SLAC, SiD Workshop, Dec 2011

15. Mauro Pivi SLAC, SiD Workshop, Dec 2011
ESTB: 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, SiD Workshop, Dec 2011

16. Mauro Pivi SLAC, SiD Workshop, Dec 2011
ESTB: Secondary e- beams
(Left) Spectrum of secondary e- beam from 14.7 GeV primary beam and (Right) transmission rate over each collimator. Adjusting 2 collimators, down to 1 e- /pulse.
Mauro Pivi SLAC, SiD Workshop, Dec 2011

17. Carsten Hast, SLAC, Test Beams in the US
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

18. Mauro Pivi, SLAC, ESA Test Beam
Telescope
Available Options:
EUDET: developed by Desy
– Proven to work and very popular
– DESY, Bonn and ATLAS
– Lot of effort spent for optimization: cloning is now easy
Timepix: developed by LHCb.
good rate, cost.
SLAC telescope: P. Grenier group.
Last generation pixel sensors for ATLAS upgrade (!?)
build from cosmic telescope experience.
Mauro Pivi, SLAC, ESA Test Beam

19. ESTB Status
In November, installed 1 new kicker magnet in the Beam Switch Yard (BSY). This allows kicking a 4 GeV beam to ESA.
Ongoing commissioning of the kicker magnet and the A-line.
Additional beryllium target in the BSY to generate secondary e- beams.

20. Mauro Pivi, SLAC, ESA Test Beam
ESTB Status
Building a new Personal Protection System (PPS) system and installing a new beam dump in ESA.
Once PPS and beam dump are completed, beams can be directed to ESA.
4 new kicker magnets with ceramic chambers have been manufactured to allow 14.7 GeV to ESA. Magnets needs to be assembled and installed in the BSY.
Mauro Pivi, SLAC, ESA Test Beam

21. ESA beam dump shielding 3 kW
ESA east wall
250 cm Pb
CONCRETE
115 cm
40 cm
75 cm
115 cm
25 cm
CONCRETE
183 cm
208 cm
730 cm
180 cm

22. Pulsed Kicker Magnet in the BSY to divert LCLS beam to ESA
BSY and LCLS beam line
Magnet
coils
Mauro Pivi SLAC, SiD Workshop, Dec 2011

23. Pulsed Magnet Kicker in the BSY to divert LCLS beam to ESA
to LCLS
Overview of Beam Switch-Yard area
to ESTB
Beryllium target
Kicker magnet
4 new kicker magnets go here
Mauro Pivi, SLAC, ESA Test Beam

24. A-line kicker screenshot with beam
Screenshot taken while kicking the beam
Channel 1: beam time current sample trigger
Channel 3: magnet current (200A/V)
Channel 4: trigger

25. Commissioning: 14.7 GeV and 120Hz beam, kicker at 1 Hz and 20 Amps (low current)
Horizontal position at Beam Position Monitor 85 meters down beam of kicker
Kicker polarity is correct
Kicker amplitude as expected
LCLS beam

26. Commissioning: 14.7 GeV and 120Hz beam, kicker at 1 Hz and 730 Amps (high current)
Horizontal position at Beam Position Monitor 100 meters down beam of kicker
120 Hz LCLS beam
Following pulse also slightly kicked
Kicked beam is lost on the pipe
Kicker on at 1 Hz
Kicker off
Small magnetization left in kicker.
Next: ”degaussing” the magnet with negative signal at end

27. Submit a proposal for use of ESTB test beams!
Beam Test Proposals
Howard Matis, LBNL (*)
Philippe Grenier, SLAC (*)
Leo Grenier, LBNL (*)
Elliott Bloom, SLAC (*)
Ray Frey, University of Oregon (*)
Jerry Va’Vra, SLAC
Mike Hildreth, Notre Dame University (*)
Roger Jones, Cockcroft/Manchester U
Mario Santana, SLAC Bruce Schumm, UC Santa Cruz  Konstantin Belov, UCLA
Mike Rooney (*)
Peter Gorham, Hawaii U. (*)
Test of the SSD Electronics for STAR HFT Upgrade
Pixel Sensors for ATLAS Upgrades
STAR Pixel Detector
Fermi Large Area Telescope
LC detector: Silicon-Tungsten Calorimeter
Super B R&D
Energy Spectrometry
CLIC Wakefield Collimator Studies
Radiation Physics Beam Tests
Beamcal Radiation Damage Study
Geosynchrotron Radio Emission from Extensive Air Showers
SuperB DCH
Askaryan Effect in High Energy Showers
Submit a proposal for use of ESTB test beams!
to Mauro Pivi or Carsten Hast 27

29. efficiency and spatial resolution sensors
Solenoid Tracker at RHIC: search qg plasma.

30. Collimator Wakefield Measurements
R.M. Jones, D. Schulte, R. Tomas, W. Wuensch for the CLIC team
Bunch length measurement is critical . New electro-optic bunch length instrumentation (CLIC CDR)
Need BPM resolution in the 100 nm level (partially contributed by CERN)

31. Schedule
Mid of January can do first test by kicking a 4 GeV beam into A-line
ESA PPS and beam dump become available this February
4 GeV primary beam to ESA
4 – 14.7 GeV secondary electron beam to ESA
First ESTB run in May (need commissioning time)
Summer install 4 BSY kicker magnets with ceramic chambers
14.7 GeV primary beam to ESA
SLAC downtimes are in Aug/Sept and over Christmas for the next years
Mauro Pivi SLAC, SiD Workshop, Dec 2011 31

32. Mauro Pivi SLAC, SiD Workshop, Dec 2011
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
Beam parameters determined by LCLS. Availability 5Hz + opportunities to increase rate when not needed for LCLS.
We installed 1 new kicker for e- beams in ESTB by February with commissioning by May.
First ESTB run in April / May 2012
Installation of the full 4 kicker system by summer 2012
Hadron beam line upgrade needs user requests and funding
Mauro Pivi SLAC, SiD Workshop, Dec 2011 32

33. ESTB Stage II: Hadron Production
Add Be target, beam dump, analyzing magnet, momentum slit, and quadrupole doublets to produce a secondary hadron beam
Production angle = 1.35O and Acceptance = 10 sr
Production of Hadrons would add desirable capabilities to ESTB, But currently is Not Funded.
We need User requests!
p produced at rate 1 p / 250 pC beam
Protons and Kaons at ~ 0.02 / 250 pC

34. Mauro Pivi SLAC, ARD Status Meeting, April 2011
Development: Short bunch length
Interest to short bunches ~50mm (CLIC, accel. R&D..)
LCLS beam: 10 mm and smaller
In the A-line, bunch length increases to 280 mm due to 24° bend, large dispersion and large R56
Solution: installation of 4 available QUADs in A-line
- to reduce R (T. Fieguth)
- with LCLS beam sE~0.02% (Z. Huang)
- bl = 50 mm or shorter in ESA
4 Quadrupoles later
Existing optics
R56<0.1
R56~0.46
Mauro Pivi SLAC, ARD Status Meeting, April 2011