# Presentation: 525451

## Linac Coherent Light Source UpdateJohn N. Galayda, Stanford Linear Accelerator Center5 November 2002

*Overview*
*Project Status*
*LCLS user workshop*
*Collaboration with TESLA*
*Project R&D*

## Overview

***The world’s ***_***first ***_*** hard x-ray laser***
***Unprecedented brightness, Unprecedented time resolution***
*0.8 – 8 keV SASE Free Electron Laser*
*Electron beam 4.5 – 14.35 GeV, from SLAC Linac*
*Peak power in SASE bandwidth 8 GW*
*Peak brightness 10**33** photons/(mm**2** mr**2** 0.1%BW)*
*Pulse duration **** 230 femtoseconds*
*Pulse repetition rate 120 Hz*

## LCLS

**LCLS**
**Operating**
**Ranges**

## Linac Coherent Light Source

**Linac Coherent Light Source**

**1992: Proposal (C. Pellegrini)**
**1998: Preliminary Design Study Completed**
**1999: R&D funded at $1.5M/year**
**2001: CD-0**
**2002: Conceptual Design ****http://www-ssrl.slac.stanford.edu/lcls/CDR/**
**2003: Project Engineering Design begins**
**2005: Long-Lead Procurements begin**
**2006: Construction begins**
**2007: ****First Light**
**2008: Project completion**

## Conventional Construction

*Final Focus Test Beam Extension*
*Hall A*
*Tunnel*
*Hall B*

## Estimated Cost, Schedule

*$200M-$240M Total Estimated Cost range*
*$245M-$295M Total Project Cost range*
*Schedule:*
***FY2003**** Authorization to begin engineering design*
*Emphasis on injector and undulator*
***FY2005 ****Long-lead purchases for injector, undulator*
*FY2006 Construction begins*
**January 2007 ***Injector tests begin*
**October 2007**  *FEL tests begin*
**September 2008 ***Construction complete*

## Construction Strategy

*2003 – Project Engineering Design Begins*
*$6M budget*
*Prepare for Long-lead procurements in 2005*
*Undulator*
*Gun Laser*
*Injector Linac Systems*
*Spring 2003 – review of plans for long lead procurements*
*CD-2A Go-ahead required*
*Spring 2004 – Complete Preliminary Design of LCLS*
*CD-2 requirements complete for entire project*
*October 2004 – begin long-lead procurements*
*Summer 2005 – Critical Decision 3 – Approve start of construction*
*Winter 2007 – Begin FEL commissioning*
*October 2008 – Project Complete*

## Preliminary Schedule

**Preliminary Schedule**

| Construction |
| --- |

| Operation |
| --- |

| Design |
| --- |

**CD-1**

**CD-2a**

**CD-2b**

**CD-3a**

**CD-3b**

- Critical Decision 0 – Mission Need				June 13, 2001
- Critical Decision 1 – Preliminary Baseline Range		         	September 2002
- Start Project Engineering Design				October 2002
- Critical Decision 2a – Long-Lead Procurement Budget		Spring 2003
- Critical Decision 2b – Performance Baseline			April 2004
- Critical Decision 3a – Start Long-Lead Procurements		August 2004
- Fund Long-Lead Procurements				October 2004
- Critical Decision 3b – Start Construction			August 2005
- Fund Construction					October 2005
- Construction Complete				                    End  of FY2008

**CD-0**

## Project Planning/Approval Status

*Critical Decision 1 Approved 16 October 2002*
*Conceptual Design is judged sound*
*Preliminary Hazard Analysis accepted*
*Acquisition Execution Plan accepted*
*Preliminary Project Execution Plan accepted*
*Project Engineering Design Funds - $6M requested in 2003*
*LCLS PED funds are in House and Senate Committee Markups*
*LCLS PED is considered a *_***New Start***_
*Allocation under the continuing resolution budget is $0*
*Not quite as bad as it sounds*

##  Workshop – Experimental Opportunities with LCLS –   8-9 October 2002

*The LCLS Project is in its initial phase with a construction start scheduled for FY 2006. The DOE is planning*
*to provide specific funding for construction of experiments after Critical Decision 3 (start of LCLS *
*construction) has been taken, expected in mid 2005 calendar year. However, DOE will, starting in FY2003, *
*review and fund proposals for research needed to design an LCLS experiment. The purpose of this  *
*Planning Workshop is to provide prospective LCLS researchers with the information necessary to start the *
*experiment planning process. It will also mark the beginning of a dialog between future LCLS experimenters *
*and the Project Team that will shape the development of the LCLS from conceptual design to running *
*facility. *
*                     *
*  ***30 Attendees, including “first Experiments” co-authors**
**  ****Discussed Proposal/Review Sequence**
**  ****LCLS Scientific Advisory Committee, chaired by Roger Falcone, UCB**
**  ****Identification of R&D needs prerequisite to proposals**
**Timing and related diagnostics**
**Detectors**
**Damage studies**
*  *

## LCLS Science Program based on the SSRL Model

*Experiment Proposals will be developed by leading research teams with SSRL involvement*
*Proposals will be reviewed by the LCLS Scientific Advisory Committee*
*Research teams secure outside funding with SSRL participation and sponsorship as appropriate*
*SSRL will manage construction*
*Provides cost and schedule control, rationalized design*
*Provides basis for establishing maintenance and support infrastructure*
*SSRL will partner with research teams to commission endstations*
*“**General user” mode with beam time allocation based on SAC recommendations*

## Workshop – Experimental Opportunities with LCLS –   8-9 October 2002

*Proposal sequence*
*LCLS actions*
*Prepare proposal guidelines*
*Call for letters of intent *
*Target late Spring *_*2003*_* for submission deadline*
*LCLS Scientific Advisory Committee Review*
*Request Pre-proposal R&D funds if necessary*
*Proposals reviewed by SAC*
*DOE will review/approve proposals in 2005 time frame*

## SLAC-DESY/TESLA FEL Collaboration

*1 November SLAC/DESY FEL Collaboration Workshop*

- Albrecht	  Hermann              Ray         	 Jonathan
- Wagner      Schunck              Orbach     	Dorfan
- Director	   Ministry  of                    DOE Office  	 Director
- DESY	   Science/Education        of Science    	 SLAC

## SLAC-DESY/TESLA FEL Collaboration

*January 2000 Memorandum of Understanding*
*SLAC-DESY-KEK**	**FEL R&D*
*SLAC will deliver a bunch length measurement system to TTF*
*Expanded SLAC-DESY Collaboration, November 1 2002*
*Sub-Picosecond  Photon Source at SLAC (SPPS)*
*9 kev x-rays using SLAC linac and Final Focus Test Beam*
*12/2002 DESY personnel will participate in commissioning*
*2003-2006 DESY will join in SPPS experiments*
*TESLA Test Facility*
*2003-2004 SLAC personnel will participate in commissioning*
*2005-2006 SLAC participation in experiments to control temporal coherence*
*LCLS*
*2007-2008 TESLA-XFEL Participation in tests of optics*
*TESLA*
*2011—SLAC participation in TESLA-XFEL Commissioning*

## Common Challenges- High Brightness Electron Sources

- Photocathode
- Laser
- Numerical techniques for gun design
- Verification with experiment
- Diagnostic Techniques

## Photocathode Gun R&D

**Gun R&D**
**BNL/SLAC/UCLA Gun has been proven**
**as an FEL driver at BNL-ATF and ANL**
**Basis of KEK, Frascati FEL designs**
**Design verification at the SSRL Gun Test Facility**
**      ****Limborg, C. et al., “PARMELA versus Measurements for GTF and DUVFEL”**
***     ******Proceedings of the 2002 European Particle Accelerator Conference, Paris***
***     ******3-7 June 2002*****, pp. 1786-1788 **

## Common Challenges - Acceleration/Compression

**Common Challenges - Acceleration/Compression**

## Common Challenge – Coherent Synchrotron Radiation

**Common Challenge – Coherent Synchrotron Radiation**

- ****

- ****

*s*

- *x*

- bend-plane emittance growth

- January 14-18, 2002 at DESY-Zeuthen (Berlin, GERMANY)

**Chicane CSR Test-Case**

- Coherent Synchrotron Radiation
- Theory
- Numerical computations:
- ANL, SLAC, TESLA, JLAB, ENEA
- Experiment
- Short, high current bunches

- S. Heifets, S. Krinsky, G. Stupakov, SLAC-PUB 9165, March 2002
- Z. Huang, K. J. Kim, PRSTAB _5_ 074401(2002)
- E. Saldin, et al.  TESLA-FEL 2002-2 (submitted to NIM)

## Coherent Synchrotron Radiation

**Definitive work in Coherent Synchrotron Radiation**
** ****theory, modeling**

- Z. Huang, et al. PRSTAB _5_, 074401 (2002)
- S. Heifets, et al. SLAC-PUB-9165, 3/2002
- P. Emma,2002  European Part. Accel. Conf.

## Short Bunch Diagnostics Tests Planned for TESLA, SLAC

- P. Emma,
- J. Frisch,
- P. Krejcik,
- G. Loew,
- X.-J. Wang

*S*-band

- Tested at
- SLAC
- Tested
- at
- TTF

**Added to**
**TTF-II**

**Added**
**To**
**SPPS**

## SASE Light Pulse length

- LCLS Simulation

- TTF x-ray pulse length
-            data

**SASE light pulse shorter than electron bunch**
**LCLS Studies ongoing re: controllability**

## Common Goals – Seeding, Harmonic Generation

## News from DESY

**A more modest start for the TESLA XFEL Laboratory**
**20 GeV linac**
**3 FEL undulator sources**
**2 Spontaneous undulator sources**
**New Technical Design Report, budget submitted to German Science Council**
**DESY 2002-167, TDR to be released shortly**
**More results from TTF****:    **_[http://www.aps.anl.gov/fel2002/talks/talks.html](http://www.aps.anl.gov/fel2002/talks/talks.html)_
**J. Schulz,  ***Coulomb Explosion of Rare Gas Clusters Irradiated by Intense VUV Pulses of a Free Electron Laser*
**J. Krzywinski, ***Interaction of Intense, Femtosecond Soft X-ray Pulses with Solids: Desorption, Ablation and*
*     **Plasma Formation by TTF FEL SASE Radiation *

## Sub-Picosecond Pulse Source

**Ultrafast laser/x-ray physics - the ****S****ub-****P****icosecond ****P****hoton ****S****ource**

**The SPPS collaboration will develop experimental techniques essential to LCLS science**
**Synchronization**
**Short pulse diagnostics for x-ray beams**
**Control of timing and pulse length**

**Chicane installed**
**Wiggler inside FFTB tunnel**
**Construction of x-ray beamline underway**
**Chicane tests November-December 2002**
**X-ray experiments begin May 2003**

## Undulator R&D

**Horizontal Trajectory**

**Microns**

- LCLS Undulator Prototype

**Prototype construction complete**
**Field quality specifications met**
**Ongoing investigation of thermal stability**

## Conclusion

*LCLS poised to start Project Engineering Design*
*PED for FY2003 -  Preliminary design of undulator, injector – CD-2A*
*LCLS Collaboration well-matched to LCLS challenges*
*Accelerator science and technology*
*Synchrotron radiation research and instrumentation*
*Project management experience*
*Experiment Program Planning underway, based on successful SSRL model*
*LCLS pre-proposal R&D requests starting FY2003*
*Proposals for LCLS science  in FY2006-FY2006 *

## Fundamental FEL Radiation Wavelength	1.5	 15 	Å
Electron Beam Energy	  14.3	    4.5 	GeV
Normalized RMS Slice Emittance 	    1.2	    1.2 	mm-mrad
Peak Current	    3.4	    3.4 	kA
Bunch/Pulse Length (FWHM)	230	230 	fs
Relative Slice Energy Spread @ Entrance	    <0.01	    0.025	%
Saturation Length	  87	  25	m
FEL Fundamental Saturation Power @ Exit	   8	  17	GW
FEL Photons per Pulse	   1.1	  29	1012
Peak Brightness @ Undulator Exit	   0.8	    0.06	1033 *
Transverse Coherence	 Full 	 Full
RMS Slice X-Ray Bandwidth	  0.06 	   0.24	%
RMS Projected X-Ray Bandwidth	 0.13	  0.47	%
 * photons/sec/mm2/mrad2/ 0.1%-BW

*Electron Beam Energy**	**  14.3**	**    4.5 **	**GeV*
*Normalized RMS Slice Emittance** **	**    1.2**	**    1.2 **	**mm-mrad*
*Peak Current**	**    3.4**	**    3.4 **	**kA*
*Bunch/Pulse Length (FWHM)**	**230**	**230 **	**fs*
*Relative Slice Energy Spread @ Entrance**	**    <0.01**	**    0.025**	**%*
*Saturation Length**	**  87**	**  25**	**m*
*FEL Fundamental Saturation Power @ Exit**	**   8**	**  17**	**GW*
*FEL Photons per Pulse**	**   1.1**	**  29**	**10**12*
*Peak Brightness @ Undulator Exit**	**   0.8**	**    0.06**	**10**33 ****
*Transverse Coherence**	** Full **	** Full*
*RMS Slice X-Ray Bandwidth**	**  0.06 **	**   0.24**	**%*
*RMS Projected X-Ray Bandwidth**	** 0.13**	**  0.47**	**%*
* ***** photons/sec/mm******2******/mrad******2******/ 0.1%-BW***

**Selected LCLS Baseline Design Parameters**

## End of Presentation