Commissioning Of The Lcls Linac And Bunch Compressors

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Commissioning of the LCLS Linac and Bunch Compressors

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ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (727 download)

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Download or read book Commissioning of the LCLS Linac and Bunch Compressors written by and published by . This book was released on 2008 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Linac Coherent Light Source (LCLS) is a SASE x-ray Free-Electron Laser (FEL) project under construction at SLAC [1]. The injector section, from drive-laser and RF photocathode gun through the first bunch compressor, was commissioned in the spring and summer of 2007. The second phase of commissioning, including the second bunch compressor and various main linac modifications, was completed in January through August of 2008. We report here on experience gained during this second phase of machine commissioning, including the injector, the first and second bunch compressor stages, the linac up to 14 GeV, and beam stability measurements. The final commissioning phase, including the undulator and the long transport line from the linac, is set to begin in December 2008, with first light expected in July 2009.

Commissioning of the LCLS LINAC.

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ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (727 download)

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Book Synopsis Commissioning of the LCLS LINAC. by :

Download or read book Commissioning of the LCLS LINAC. written by and published by . This book was released on 2010 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Linac Coherent Light Source (LCLS) X-ray free electron laser project is currently under construction at the Stanford Linear Accelerator Center (SLAC). A new injector and upgrades to the existing accelerator were installed in two phases in 2006 and 2007. We report on the commissioning of the injector, the two new bunch compressors at 250MeV and 4.3 GeV, and transverse and longitudinal beam diagnostics up to the end of the existing linac at 13.6 GeV. The commissioning of the new transfer line from the end of the linac to the undulator is scheduled to start in November 2008 and for the undulator in March 2009 with first light to be expected in July 2009.

Initial Commissioning Experience With the LCLS Injector

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ISBN 13 :
Total Pages : 3 pages
Book Rating : 4.:/5 (727 download)

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Book Synopsis Initial Commissioning Experience With the LCLS Injector by :

Download or read book Initial Commissioning Experience With the LCLS Injector written by and published by . This book was released on 2007 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Linac Coherent Light Source (LCLS) is a SASE xray Free-Electron Laser (FEL) project presently under construction at SLAC [1]. The injector section, from drive-laser and RF photocathode gun through first bunch compressor chicane, was installed in fall 2006. Initial system commissioning with an electron beam is taking place during the spring and summer of 2007. The second phase of construction, including second bunch compressor and full linac, will begin later, in the fall of 2007. We report here on experience gained during the first phase of machine commissioning, including RF photocathode gun, linac booster section, S-band and X-band RF systems, first bunch compressor, and the various beam diagnostics.

Commissioning the LCLS Injector

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ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.:/5 (727 download)

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Book Synopsis Commissioning the LCLS Injector by :

Download or read book Commissioning the LCLS Injector written by and published by . This book was released on 2007 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Linac Coherent Light Source (LCLS) is a SASE x-ray Free-Electron Laser (FEL) project presently under construction at SLAC. The injector section, from drive laser and RF photocathode gun through first bunch compressor chicane, was installed in fall 2006. Initial system commissioning with an electron beam was completed in August 2007, with the goal of a 1.2-micron emittance in a 1-nC bunch clearly demonstrated. The second phase of commissioning, including second bunch compressor and full linac, is planned for 2008, with FEL commissioning in 2009. We report experimental results and experience gained in the first phase of commissioning, including the photo-cathode drive laser, RF gun, photocathode, S-band and X-band RF systems, first bunch compressor, and the various beam diagnostics.

Commissioning Results of the LCLS Injector

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ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (727 download)

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Download or read book Commissioning Results of the LCLS Injector written by and published by . This book was released on 2007 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Linac Coherent Light Source (LCLS) is a SASE xray Free-Electron Laser (FEL) project presently under construction at SLAC. The injector section, from drive-laser and RF photocathode gun through first bunch compressor chicane, was installed in fall 2006. Initial system commissioning with an electron beam has recently been completed. The second phase of construction, including second bunch compressor and full linac, is planned for 2008. In this paper, we report experimental results and experience gained during the first phase of machine commissioning. This includes the cathode, drive laser, RF photocathode gun, linac booster section, S-band and X-band RF systems, first bunch compressor, and the various beam diagnostics.

Commissioning of the SPPS Linac Bunch Compressor

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ISBN 13 :
Total Pages : 3 pages
Book Rating : 4.:/5 (684 download)

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Download or read book Commissioning of the SPPS Linac Bunch Compressor written by and published by . This book was released on 2003 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: First results and beam measurements are presented for the recently installed linac bunch compressor chicane. The new bunch compressor produces ultra-short electron bunches for the Sub-Picosecond Photon Source (SPPS) and for test beams such as the E164 Plasma Wakefield experiment. This paper will give an overview of the first experiences with tuning and optimizing the compressor together with a description of the beam diagnostics and beam measurements. These measurements form the basis for further detailed study of emittance growth effects such as CSR and wakefields in a previously unmeasured regime of ultra-short bunch lengths.

The Linac Cooherent Light Source (LCLS) Accelerator

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ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (871 download)

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Book Synopsis The Linac Cooherent Light Source (LCLS) Accelerator by :

Download or read book The Linac Cooherent Light Source (LCLS) Accelerator written by and published by . This book was released on 2007 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Linac Coherent Light Source (LCLS) is a SASE x-ray Free-Electron Laser (FEL) based on the final kilometer of the Stanford Linear Accelerator. Such an FEL requires a high energy, high brightness electron beam to drive the FEL instability to saturation. When fed by an RF-photocathode gun, and modified to include two bunch compressor chicanes, the SLAC linac will provide such a high quality beam at 14 GeV and 1-[mu]m normalized emittance. In this paper, we report on recent linac studies, including beam stability and tolerances, longitudinal and transverse feedback systems, conventional and time-resolved diagnostics, and beam collimation systems. Construction and installation of the injector through first bunch compressor will be completed by December 2006, and electron commissioning is scheduled to begin in January of 2007.

Analysis on Achieving a Minimum Bunch Length in LCLS Bunch Compressor One

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ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Analysis on Achieving a Minimum Bunch Length in LCLS Bunch Compressor One by :

Download or read book Analysis on Achieving a Minimum Bunch Length in LCLS Bunch Compressor One written by and published by . This book was released on 2011 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: An ultra-short bunch is required by different applications in many aspects. In this paper, the condition to achieve a minimum bunch length at the Linac Coherent Light Source (LCLS) [1] bunch compressor one (BC1) is analyzed analytically and evaluated by simulation. The space charge, wake field and coherent synchrotron radiation (CSR) effects are not discussed here.

Status of the Linac Coherent Light Source

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ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (873 download)

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Book Synopsis Status of the Linac Coherent Light Source by :

Download or read book Status of the Linac Coherent Light Source written by and published by . This book was released on 2011 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Linac Coherent Light Source (LCLS) is a free electron laser facility in construction at Stanford Linear Accelerator Center. It is designed to operate in the wavelength range 0.15-1.5 nanometers. At the time of this conference, civil construction of new tunnels and buildings is complete, the necessary modifications to the SLAC linac are complete, and the undulator system and x-ray optics/diagnostics are being installed. The electron gun, 135 MeV injector linac and 250 MeV bunch compressor were commissioned in 2007. Accelerator commissioning activities are presently devoted to the achievement of performance goals for the completed 14 GeV linac.

Measurements of Compression and Emittance Growth After the First LCLS Bunch Compressor Chicane

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ISBN 13 :
Total Pages : 3 pages
Book Rating : 4.:/5 (727 download)

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Book Synopsis Measurements of Compression and Emittance Growth After the First LCLS Bunch Compressor Chicane by :

Download or read book Measurements of Compression and Emittance Growth After the First LCLS Bunch Compressor Chicane written by and published by . This book was released on 2007 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Linac Coherent Light Source (LCLS) is a SASE xray free-electron laser project presently under construction at SLAC. The injector section from RF photocathode gun through first bunch compressor chicane was installed during the fall of 2006. The first bunch compressor is located at 250 MeV and nominally compresses a 1-nC electron bunch from an rms length of about 1 mm to 0.2 mm. Transverse phase space and bunch length diagnostics are located immediately after the chicane. We present preliminary measurements and simulations of the longitudinal and transverse phase space after the chicane in various beam conditions, including extreme compression with micron-scale current spikes.

Wakefield Calculations for the LCLS in Multbunch Operation

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ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (873 download)

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Download or read book Wakefield Calculations for the LCLS in Multbunch Operation written by and published by . This book was released on 2011 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Normally the Linac Coherent Light Source (LCLS) operates in single-bunch mode, sending a bunch of up to 250 pC charge at 120 Hz through the linac and the undulator, and the resulting FEL radiation into one of the experimental hutches. With two bunches per rf pulse, each pulse could feed either two experiments or one experiment in a pump-probe type configuration. Two-bunch FEL operation has already been briefly tested at the LCLS, and works reasonably well, although not yet routinely. In this report we study the longitudinal and transverse long-range (bunch-to-bunch) wakefields of the linacs and their effects on LCLS performance in two-bunch mode, which is initially the most likely scenario. The longitudinal wake changes the average energy at the second bunch, and the transverse wake misaligns the second bunch (in transverse phase space) in the presence of e.g. transverse injection jitter or quad misalignments. Finally, we extend the study to consider the LCLS with trains of up to 20 bunches per rf pulse. In the LCLS the bunch is created in an rf gun, and then passes in sequence through Linac 0, Linac 1, Linac X, Bunch Compressor 1 (BC 1), Linac 2, BC 2, Linac 3, and finally the undulator. In the process the bunch energy reaches 13.5 GeV and peak current 3 kA. In Table 1 we present some machine and beam parameters in three of the linacs that we will use in the calculations: initial beam energy E0, total accelerator length L, average beta function [beta]{sub y}, bunch peak current I, and rf phase (with respect to crest) [phi]; the final energy of a linac equals E0 of the following linac, and in Linac 3 is E{sub f} = 13.5 GeV. (The X-band linac, with L = 60 cm, has wake effects that are small compared to the other linacs, and will not be discussed.) In this report we limit our study to trains of equally populated, equally spaced bunches with a total length of less than 100 ns. The charge of each bunch is eN{sub b} = 250 pC.

A Superconducting Wiggler for the LCLS.

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ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (684 download)

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Download or read book A Superconducting Wiggler for the LCLS. written by and published by . This book was released on 2002 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: A strong wiggler is likely to be required for the LCLS to reduce bunching that would cause beam instabilities due to coherent synchrotron radiation in the second linac bunch compressor. This wiggler will be located in a 3 m straight section immediately upstream from the bunch compressor at SLAC linac sector 24-7,where the e-beam will have an energy of 4.5 GeV. The peak field of the wiggler will have to be at least 5T, so a superconducting device is required. In this technical note, we describe a general design approach, and a specific proposal for this wiggler.

Measurements and Simulations of Ultra-Low Emittance and Ultra-Short Electron Beams in the Linac Coherent Light Source

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ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (727 download)

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Book Synopsis Measurements and Simulations of Ultra-Low Emittance and Ultra-Short Electron Beams in the Linac Coherent Light Source by :

Download or read book Measurements and Simulations of Ultra-Low Emittance and Ultra-Short Electron Beams in the Linac Coherent Light Source written by and published by . This book was released on 2009 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Linac Coherent Light Source (LCLS) is an x-ray Free-Electron Laser (FEL) project presently in a commissioning phase at SLAC. We report here on very low emittance measurements made at low bunch charge, and a few femtosecond bunch length produced by the LCLS bunch compressors. Start-to-end simulations associated with these beam parameters show the possibilities of generating hundreds of GW at 1.5 Å x-ray wavelength and nearly a single longitudinally spike at 1.5 nm with 2-fs duration.

Effects of Linac Wakefield on CSR Microbunching in the Linac Coherent Light Source

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ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (684 download)

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Book Synopsis Effects of Linac Wakefield on CSR Microbunching in the Linac Coherent Light Source by :

Download or read book Effects of Linac Wakefield on CSR Microbunching in the Linac Coherent Light Source written by and published by . This book was released on 2003 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design of the Linac Coherent Light Source (LCLS) requires two-stage bunch compression for stability against timing and charge jitters. Coherent synchrotron radiation (CSR) induced in these bunch compressors can drive a microbunching instability that may degrade the beam brightness. In this paper, we study effects of the longitudinal wakefield in the accelerator on this instability. We show that significant energy modulation can be accumulated in the linac through the geometrical wakefield and can enhance the CSR microbunching in these compressors. Analytical calculations are compared with numerical simulations to evaluate the gain of microbunching for the entire LCLS accelerator system.

Start-to-End Simulations of the LCLS Accelerator and FEL Performance at Very Low Charge

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ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (727 download)

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Book Synopsis Start-to-End Simulations of the LCLS Accelerator and FEL Performance at Very Low Charge by :

Download or read book Start-to-End Simulations of the LCLS Accelerator and FEL Performance at Very Low Charge written by and published by . This book was released on 2009 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Linac Coherent Light Source (LCLS) is an x-ray Free-electron Laser (FEL) being commissioned at Stanford Linear Accelerator Center (SLAC). Recent beam measurements have shown that, using the LCLS injector-linac-compressors, the beam emittance is very small at 20 pC. In this paper we perform start-to-end simulations of the entire accelerator including the FEL undulator and study the FEL performance versus the bunch charge. At 20 pC charge, these calculations associated with the measured beam parameters suggest the possibility of generating a longitudinally coherent single x-ray spike with 2-femtosecond (fs) duration at a wavelength of 1.5 nm. At 100 pC charge level, our simulations show an x-ray pulse with 10 femtosecond duration and up to 1012 photons at a wavelength of 1.5 Å. These results open exciting possibilities for ultrafast science and single shot molecular imaging.

An ''NLC-style'' Short Bunch Length Compressor in the SLAC Linac

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Total Pages : pages
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Download or read book An ''NLC-style'' Short Bunch Length Compressor in the SLAC Linac written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental tests of a ''second bunch length compressor'' in a linac is important for the next generation of linear colliders and for other future accelerators. These future accelerators need bunches with lengths of order 0.06 [minus] 0.2 mm. At these lengths, new accelerator dynamics will be encountered. We have studied the possibility of constructing a second compressor with the present SLAC linac and have found a reasonable design. The core of this project is to reconfigure an old beamline (BL-90) at the 1000m location in the linac to: (1) extract a 10 GeV bunch, (2) pass it through a new 96 m long transport line in which length compression is done, and (3) reinject the beam into the main linac in an available drift section. Using the resulting compressed bunch, accelerator physics tests would be performed in the remaining downstream linac with the resulting very high charge density. The bunch compression in this transport line results from the TRANSPORT element R[sub 56] as determined from the optics of the transport line. [Delta]z = R[sub 56] [Delta]E/E. For example, if [Delta]z = [minus]0.5 mm, [Delta]E/E = 0.5%, R[sub 56] = [minus]0.1 m, a bunch of 5 [times] 10[sup 10] particles would have a final length ([sigma][sub z]) of about 0.08 mm with a peak current of 9600 [angstrom].

An Ǹ̀LC-style ̀̀short Bunch Length Compressor in the SLAC Linac

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ISBN 13 :
Total Pages : 3 pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis An Ǹ̀LC-style ̀̀short Bunch Length Compressor in the SLAC Linac by :

Download or read book An Ǹ̀LC-style ̀̀short Bunch Length Compressor in the SLAC Linac written by and published by . This book was released on 1993 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental tests of a s̀̀econd bunch length compressor ̀̀in a linac is important for the next generation of linear colliders and for other future accelerators. These future accelerators need bunches with lengths of order 0.06 - 0.2 mm. At these lengths, new accelerator dynamics will be encountered. We have studied the possibility of constructing a second compressor with the present SLAC linac and have found a reasonable design. The core of this project is to reconfigure an old beamline (BL-90) at the 1000m location in the linac to: (1) extract a 10 GeV bunch, (2) pass it through a new 96 m long transport line in which length compression is done, and (3) reinject the beam into the main linac in an available drift section. Using the resulting compressed bunch, accelerator physics tests would be performed in the remaining downstream linac with the resulting very high charge density. The bunch compression in this transport line results from the TRANSPORT element R56 as determined from the optics of the transport line.?z = R56?E/E. For example, if?z = -0.5 mm,?E/E = 0.5%, R56 = -0.1 m, a bunch of 5 × 101° particles would have a final length (?{sub z}) of about 0.08 mm with a peak current of 9600 Å.