Tor Raubenheimer Stanford Graduate Student Orientation September 20 2012 What are accelerators Wikipedia A particle accelerator is a device that uses electromagnetic fields to propel ID: 604724
Download Presentation The PPT/PDF document "Accelerator Research at SLAC" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
Accelerator Research at SLAC
Tor Raubenheimer
Stanford Graduate Student Orientation
September 20, 2012Slide2
What are accelerators?
Wikipedia: A
particle accelerator
is a device that uses
electromagnetic fields
to propel charged particles to high speeds and to contain them in well-defined beamsCRT’s x-ray tubes SRS Large Hadron ColliderVelocity = 0.999999999986 x speed of light at LEP2~26,000 accelerators worldwide~44% are for radiotherapy, ~41% for ion implantation, ~9% for industrial processing and research, ~4% for biomedical and other low-energy research,~1% with energies > 1 GeV for discovery science and research
2
Stanford Graduate Student Orientation, 9/20/2012Slide3
3
Accelerators at SLAC
Stanford Graduate Student Orientation, 9/20/2012
Particle Accelerators at SLAC
XTA
FACET
ASTASlide4
Field of Accelerator Physics
Broad field ranging from engineering some of the largest scientific instruments to plasma physics to materials science to nonlinear dynamicsAdvances come from both conceptual research and directed R&D aimed at applications
Field offers opportunity for ‘small-scale’ experiments at large science facilities
Small groups:
Individuals can engage in
theory, simulation, and experimental resultsLHCTevatron
LEP-II
SLC
HERA
4Slide5
Advanced Accelerator Research @ SLAC
High energy particle accelerators are the ultimate microscopes
Reveal fundamental particles and forces in the universe at the energy frontier
Enable x-ray lasers to look at the smallest elements of life
Goal
is to shrink the size and cost by factors of 10-1000Combine SLAC accelerators with lasers, plasmas, high-power microwaves, and lithography to develop new generation of particle accelerators and sourcesNew designs and materials push metal accelerator structures
to the limit
Telecom and Semiconductor tools used to make an ‘accelerator on a chip’
Extremely high fields in 1,000°C lithium plasmas have doubled the energy of the
3-km
SLAC
linac
in just 1 meterSlide6
The
E163
Test Facility and the Next Linear Collider Test Accelerator provide unmatched capabilities for testing laser accelerators. The small size of the group (<10) means that students can be involved in virtually all aspects of the experiment.
Contact: Dr. Eric Colby,
926-3709; Dr. Joel England, 926-3706
6Woodpile StructureSlide7
Plasma Wakefield Acceleration
Acceleration gradients of ~50 GV/m (3000 x SLAC)Doubled energy of 45 GeV
beam in 1 meter plasma
FACET brand-new 20
GeV
test facility for PWFAContact: Dr. Mark Hogan, 926-2951
Page
7Slide8
Accelerator Beam Physics and Computing
Broad set of topics ranging from concepts for future high-energy physics and photon science facilities, to massively parallel simulations, to beam theory
Developed many of the innovative concepts of the field including:
Linear collider designs
Linac
coherent light source (x-ray FEL)PEP-X and other future light sources Massively parallel electromagnetic calculationsFaculty: Alex Chao, Ron RuthDepartment heads: Yunhai Cai and Cho Ng
8Slide9
9
Compact accelerators
Developing new compact accelerator
for Inverse Compton Scattering,
FEL’s and Ultrafast e
- DiffractionGunLinac
YAG, Laser Injection chamber
Cecile Limborg
926-8685
Chris
Adolphsen
926-3560Slide10
10
Novel experimental beam dynamics
Stanford Graduate Student Orientation, 9/20/2012Slide11
Undulator Mechanical Structure
Electric Field Distribution
Accelerator Technology Research
High
Gradient Research:
Host for the US Collaboration on High Gradient Research for Future Colliders
RF Superconducting Material
Characterization, Geometrical Effects, Frequency scaling
,.
High Frequency RF Source Developments.
Novel Accelerator
structures
Novel
FEL Technologies and Light Sources:
RF undulators and bunch compression techniques for ultra-short pulses.
Advanced Accelerator Concepts:
Practical design and implementation
of Terahertz and far infrared accelerators and components
For more info contact: Prof. Sami
Tantawi
650-926-4454Slide12
SPEAR3 accelerator research
Short pulses/THz beamlineLDRD funding to design THz
beamline
Primary rotation research focus
Beamline
purpose:Characterize bunch shapeMeasure shielded CSR impedanceTHz for photon experimentsAccelerator optics/Nonlinear dynamics PEP-X (future light source)Gun developmentDiagnostics developmentJames Safranek, 926-5438
Measured SPEAR bunch
Calculated THz
Nonlinear dynamics:
simulated & measuredSlide13
13
Large Hadron Collider: Accelerator Research
Stanford Graduate Student Orientation, 9/20/2012Slide14
14
Advanced Instrumentation and Feedback
Signal processing systems for beam instrumentation and feedback
control systems. Develop DSP with 4-8 GHz processing bandwidth
for SPS and LHC, participate in machine measurements.
System modeling and simulation of unstable systems under feedback control stabilize jitter in LCLS Machine physics studies and system dynamics characterization of the LHC RF↔beam interaction
The group comprises SLAC staff, Toohig Fellow and Stanford Ph.D. students.Two APS Dissertation Prizes in Beam Physics have
been awarded to past students.
Stanford Graduate Student Orientation, 9/20/2012
Contact: John Fox,
926-2789Slide15
15
LHC Projects
A number of potential thesis projects on LHC
Crystal collimation
with Uli
WeinandsHiLum LHC design Yunhai CaiLLRF, feedback and Electron cloud instability and control with John FoxFaculty members:John Fox, x2789Senior Staff:Tom Markiewicz, x2668 Uli Wienands, x3817 Yunhai Cai, x2935
Stanford Graduate Student Orientation, 9/20/2012Slide16
16
Linac
Coherent Light Source (LCLS)
World’s first x-ray laser – a Free Electron Laser
Commissioned in 2009 and constantly advancing new concepts
Stanford Graduate Student Orientation, 9/20/2012
April 10, 2009Slide17
17
LCLS Undulator Hall
Stanford Graduate Student Orientation, 9/20/2012Slide18
Slide
18Linac'12, Tel Aviv, Sept. 2012
Linac Coherent Light
Source II
Injector @
1-km
point
Sectors 10-20 of
Linac
(1 km)
(with modifications)
X-ray Transport
Optics/Diagnostics
New Underground Experiment Hall
Bypass LCLS Linac
In PEP Line
(extended)
New Beam Transport
Hall
SXR, HXR Undulators
2010: April-
Critical Decision 0
approved
2011: October-
Critical Decision 1
approved
2012: March-
Critical Decision 3a
approved
2012: August-
Critical Decision 2
2013: June-
Critical Decision 3b
2018: Sept.
First FEL Light
2019: Sept.
Critical Decision 4Slide19
SASE spectrum
Seeded spectrum
Seeding + taper
FEL R&D opportunities @ SLAC
LCLS is the world’s brightest x-ray source.
You have
the opportunity
to
make it even
brighter!
Seeding improves spectral brightness
Tapered
undulator
increases
FEL power to Terawatt level
Many challenging theoretical,
computational, and experimental topics
to pursue in the coming years (see next slide)Slide20
2011-12
2015-16
2013-14
2017-18
2019-20
LCLS-II injector
LCLS-II completion
HXRSS
Injector R&D
S0 ITF: advanced beam generation, high-energy compression and laser seeding
Temporal diagnostics & timing
Attosecond
x-ray generation
X-ray seeding & brightness
E-beam brightness & manipulation
Technology
development
Ultrafast techniques
ECHO-7
Soft X-Ray Self-Seeding
ECHO-75, laser phase error error
THz & Polarization
THz
Polarization control
Multi bunches, detectors, novel
undulators
, high-rep. rate
ASTA (Cathode, Gun)
X-ray sharing
TWFEL
HHG efficiency and control
Completed
Ongoing
Under development
SLAC FEL
R&D roadmap
HXRSSSlide21
21
SLAC Facilities
Phenomenal accelerator R&D facilities:
Accelerator Structure Test Area
NLC Test Accelerator
X-band Test Accelerator End Station Test Beam FACET SPEAR-3 Linac Coherent Light Source plus Shops and engineering staff to build what you needStanford Graduate Student Orientation, 9/20/2012
DOE Computing Resources
:
NERSC
at LBNL -
Franklin Cray XT4:
38,642 compute cores,
77
TBytes
memory,
355
Tflops
NCCS
at ORNL
-
Jaguar Cray XT5:
224,256 compute cores
,
300
TBytes
memory, 2331
Tflops
,
600
TBytes
disk space
Local clusters and GPU machines
Slide22
22
Examples of Recent PhD Theses
Dan Ratner, “Much Ado about
Microbunching
: Coherent Bunching in
High Brightness Electron Beams,”Advisor: Axel Chao, 2011, Present position: Staff Scientist, SLAC Ian Blumenfeld, "Scaling of the Longitudial Electric Fields and Transformer Ratio in a Non-Linear Plasma Wakefield Accelerator,“ Advisor: Alex Chao, 2009, Present position: Scientist, Modeling Group, Archimedes Inc. Neil Kirby, "Properties of Trapped Electron Bunches in a Plasma Wakefield Accelerator," Advisor: Alex Chao, 2009, Present position: Postdoc, Radiation Oncology Department, UC San Francisco. Chris Sears, "Production, Characterization, and Acceleration of Optical Microbunches
," Advisor: Robert Siemann, 2008, Present position: MPI Munich.
Stanford Graduate Student Orientation, 9/20/2012Slide23
23
Summary
Accelerator R&D is a major effort at SLAC and there are a very broad range of potential thesis topics
Theoretical, simulation, and experimental
Many problems require effort all three
SLAC as a national lab has fantastic R&D facilities and a strong faculty and staff and one of the best PhD programs8 of the 20 American Physical Society Division of Particle Beam Thesis Award recipients to date completed their graduate research at SLAC:Dan Ratner, a student of Alex Chao’s (2012)Ian Blumenfeld, a student of Alex Chao’s (2011)Dmitry Teytelman, a student of John Fox (2004) David
Pritzkau, a student of Bob Siemann (2003)
Boris Podobedov, a student of Bob
Siemann
(2002)
Shyam
Prabhakar
, a student of John Fox (2001)
Zhirong Huang
, a student of Ron Ruth (1999)
Tor Raubenheimer
, a student of Ewan Paterson (1994)
Come talk to us and don’t forget the tour: 1:30 pm from ROB parking lot
Stanford Graduate Student Orientation, 9/20/2012