The CSU accelerator Laboratory

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THE CSU ACCELERATOR LABORATORYStephen Milton

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Collaborators/Team• Colorado State University

• Sandra Biedron• Chris Brown (Post-doc)• Theodore Burleson (Grad. Stu.)• Cristian Caricco (Undergrad. Stu.)• Alex D’Audney (Undergrad. Stu.)• Jonathan Edelen (Grad. Stu.)• Chris Hall (Grad. Stu.)• John Harris• Karen Horovitz (Grad. Stu.)• Carmen Menoni• Stephen Milton• Auralee Morin (Grad. Stu.)• Lauren Rand (Grad. Stu.)• Jorge Rocca• Nihan Sipahi (Grad. Stu.)• Taylan Sipahi (Grad. Stu.)

• University of Twente and CSU• Peter van der Slot

• ENEA, Frascati and CSU• Luca Giannessi

• Australian Synchrotron• Evelyne Meier

• LANL• Bruce Carlsten and Sheila Brandt

• JLAB• Dave Douglas, Steve Benson, Chris

Tennant, Shukui Zhang, Pavel Evtushenko

• Argonne• John Noonan and Matt Virgo

• SLAC• Tor Robinheimer and Chris

Aldophsen

• Additional Interns• Alysia Dong (SU 12) Hannah Yehudah (SU 12), Nabeel Moin (just started)

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“Recent” Interest “From Above”, i.e. DOE

• Report based on 6 working groups• Energy and the Environment• Security and Defense• Discovery Science• Medicine• Industry• Accelerator Science and Education

• New Report to Congress• Response to A4AF report• Delivery to Congress expected early

summer 2012

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Major “Take Away” from the A4AF Report• One key Finding

• Make more compact, efficient, and lower cost accelerators• Document Statistics

• Number of pages: 100 including all cover pages etc.• Word usage

• Cost: Used 59 times• Compact: Used 40 times• Efficient: Used 52 times

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The CSU Accelerator Laboratory Concept

• Create a “Best-in-Class” research facility/training center for accelerator beam science, engineering, and technology• Capitalize on the following desires/trends

• Small• Efficient• Cost effective

• Train the next generation of accelerator scientists, engineers, and technologists

• Perform world-class research in beam physics• An operational accelerator research and training facility will attract

world-class employees, collaborators, and users to CSU.

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CSU Accelerator Laboratory6

Donated by the Univ. of Twente

Donated by the Boeing Corp.

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Linac Performance ParametersLinac CharacteristicsEnergy 6 MeV

Number of Cells 5 ½

RF Frequency 1.3 GHz

Shunt Impedance 50 MW/m

Q-Value 18,000

Axial Electric Field

Cell no. 1 26 MV/m

Cell No. 2 14.4 MV/m

Cell No. 3 – 6 10.6 MV/m

Solenoid Field Strength 1,200 G

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System Performance ParametersMajor System ParametersLinac

Frequency 1.3 GHz

Repetition Rate 10 Hz

Mircopulse Rep. Rate 81.25 MHz (max.)

Klystron

Type TH 2022C (Thales)

Power 20 MW

Modulator

Type PFN

Pulse Duration 15 msec

Undulator

Type Hybrid: NdFeB

K 1 (at 8 mm gap)

Period 25 mm

Periods 50

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Cathode Preparation Chamber• A Variety of

Cathodes Can be Used• Cathode preparation

chamber• Used in the past

• CeK2Sb, K3Sb, and Copper

• The choice is dependent on what the experiment demanded

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Current Status of Linac System• Late October

• System Fully Crated and Placed on Pallets for Shipping

• 14 and 15 November• Crates and pallets loaded

into one Hi-Cube 40’ container and one normal 20’ Container

• Late December 2012 to Early January 2013• Expect shipment to arrive at

CSU

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Immediate Plans for the Linac System• January Through July 2013

• Begin assembly and system checkouts in a temporary location• A building located adjacent to the ABL

• Systems• Modulator• Low Level RF System• High Power RF Rack• Controls• Vacuum• Power Supplies• …

• Want to make certain that we discover any issues right away that might involve long lead items

• Would like to be at the point of putting power to the cavity by July 2013

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Past Performance of Linac System• As Achieved at the University of Twente

Ph.D. Thesis Univ. of Twente

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Drive Laser System• Coherent Ti:Sa System

• Micra Oscillator• Pulse Selector• Synchro Lock System• Elite Duo USP Regen Amp.

With Addition Single Pass Amp• Power by 2 diode pumped Coherent Evolution Nd:YLF lasers

• UV pulse stretcher with doubling and tripling crystals• Will not be used in its present

configuration

Basic Laser System PerformanceMicra Oscillator

Avg. Power > 300 mW

Rep. Rate 81.25 MHz

Pulse width < 15 fs with ext. comp.

Legend Elite Duo Amplifier

Avg. Power (at 800 nm) > 10 W

Avg. Power (at 256 nm) > 1 W

Pulse Duration 40 fs (FWHM)

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Drive Laser Current Status• Currently Installed in a Laboratory at the Engineering Research Center• Coherent rep to arrive the week of December 3rd to do system

checkout and training

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Drive Laser Modes of Operation• Modes of Operation

• Single high intensity pulse at 1 Hz to 1000 Hz• Low QE photocathodes• Diagnostics such as Electro-Optical Sampling• Other• Current configuration

• 81.25 MHz x 10 usec Macropulse train at 10 Hz• Used to drive high QE cathode for FEL oscillator configuration• Requires modifications to existing system

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1st Experiment: THz Free-Electron Laser• Tunable between 200-800 microns• About 1 MW peak power from 900 MW available peak beam power (6 MeV, 150

A peak current)• Average: a few mW (81.25 MHz rep rate, 15 microsecond macropulse,25-ps

micropulse)

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Courtesy Univ. of Twente

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Cartoon of Original Set up

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Courtesy Univ. of Twente

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Drive Laser Operation For THz FEL• Requires 81.25 MHz, 10 usec burst at 10 Hz

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Ph.D. Thesis Univ. of Twente

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FEL Operation

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Courtesy Univ. of Twente

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Diagnostics Development• Electro Optical Sampling System

• System intended for tests at JLab FEL• If JLab not ready then we will test it at CSU

• Beam energy resolution limited• At 6 MeV the resolution of the device will be

greatly limited due to the 1/g opening angle• We will make up for that by tightly focusing

and placing the crystal very close to the beam

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The Advanced Beam Laboratory

• CSU Board of Governors approved construction and expenditure of the money needed to build of the new building.

• CSU President has chosen to move forward with the construction and has developed a funding plan.

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The Advanced Beam Laboratory• Purpose Built• Two Primary

Thrust Area• Lasers• Accelerators

• Synergistic Opportunities

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ABL: CSU Accelerator Laboratory

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ABL Timeline• Accelerated Delivery

• Made possible by an existing construction contract to build what is called Engineering II.

• We are using the same Architect and General Contractor• Timeline (Abbreviated)

• 12 November 2012 – Fence off construction yard• 19 November 2012 – Begin site preparation work• Mid January 2013 – Walls go up• 31 July 2013 – Building ready for move in

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In Addition to the ABL• AECOM Building

• Adjacent to ABL• Will be vacated in 2014• This space will be provided to the

member groups of the ABL• Will be re-purposed for our use

Basement 1st Floor

2nd Floor

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Summary• The CSU Accelerator Laboratory

• 6 MeV photocathode linac system with state-of-the-art drive laser• Capable of delivering pulse trains at 81.25 MHz over 10

microseconds• Will be used for

• Basic beam research and diagnostic development• Training• Small, relatively high average power THz FEL• Other, as yet undisclosed, research projects

• Purpose-Built Building• Ready for move in 31 July 2012