First operation of a high duty factor photoinjector

Dowell, D.H.; Davis, K.; Friddell, K. D.; Tyson, Elizabeth L.; Lancaster, Christy A.; Milliman, L.; Rodenburg, R.E.; Aas, T.; Bemes, M.; Bethel, S.Z.; Johnson, P.; Murphy, Kevin D.; Whelen, C.; Adamski, J.; Pistoresi, D.J.; Shoffstall, D.R.; Busch, G. E.; Remelius, Dennis K.

doi:10.1109/pac.1993.309521

Cited by 13 publications

(12 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Poisoning of cathodes by oxidizing gas species such as water, carbon dioxide, and oxygen has detrimental, often lifetime-limiting impact on QE of photocathodes in normal conducting radio frequency (NCRF) photoinjectors [7], [8]. High QE cathodes for photoinjectors rely on low work function surfaces which are extremely sensitive to sub-monolayer levels of contaminating adsorbates.…”

Section: Effect Of Poisoning and Recesiation On Qementioning

confidence: 99%

Enhanced lifetime hybrid-diffuser cesium reservoir photocathode

Montgomery

Pan

Riddick

et al. 2012

AIP Conference Proceedings

View full text Add to dashboard Cite

Section: Effect Of Poisoning and Recesiation On Qementioning

confidence: 99%

Enhanced lifetime hybrid-diffuser cesium reservoir photocathode

Montgomery

Pan

Riddick

et al. 2012

AIP Conference Proceedings

View full text Add to dashboard Cite

“…Electron beam sources in radio-frequency (RF) electron guns which generate high peak current and low emittance electron beams in a particle accelerator are core to the operation of coherent radiation sources such as Free-electron lasers (FELs) [1] and medical linacs [2]. There are three main types of RF electron guns used as injectors, including thermionic cathodes [3], photocathodes [4], and field emission cathodes [5]. In thermionic RF guns, the cathode is heated and electrons are continuously emitted and accelerated during the half RF period.…”

Section: Introductionmentioning

confidence: 99%

“…The photocathode can generate the ideal electron bunch for the accelerator. It has the advantages of large current density, short pulse and low intrinsic emittance to match every acceleration RF bucket, and high quality producing low emittance electron beams [4,[6][7][8][9]. However, there are challenges involved in operating photocathodes such as invacuum photocathode replacement systems to improve lifetime, requirements of ultra-high vacuum, as well as use of a high power drive laser which limits its applications to particle accelerators that require the very lowest emittance beams.…”

Section: Introductionmentioning

confidence: 99%

Electron Injector Based on Thermionic RF-Modulated Electron Gun for Particle Accelerator Applications

Zhang

Adam

Militsyn

et al. 2020

IEEE Trans. Electron Devices

View full text Add to dashboard Cite

In this paper, the design and simulation of an electron injector based on a thermionic RF modulated electron gun for particle accelerator applications is presented. The electron gun is based on a gridded thermionic cathode with the geometry based on a Pierce-type configuration. Both theory and numerical simulation were used to explore the relationship between the bunch length and charge. The reasons for the pulse widening were also analyzed. The beam dynamics simulations showed that a minimum pulse length of 106 ps could be achieved with a bunch charge of 33 pC when the driving RF frequency was 1.5 GHz. The average transverse emittance was about 17 mm⸱mrad from the particle-in-cell simulations. Operating at a higher RF frequency did not significantly reduce the micro-pulse length.

show abstract

“…XFELs place demands on photocathodes that are presently unmet by existing photocathode technologies because requirements for simultaneously obtaining high QE and low emittance are correlated with bunch shape, and both QE and emittance are themselves related such that improving one compromises the other 10,[13][14][15][16][17][18][19][20][21][22] because of the inversely linked physics elaborated below 23,24 . These issues remain even though aggressive and substantial efforts have been undertaken to reduce the MTE that figures prominently in the emittance figure of merit.…”

Section: Introductionmentioning

confidence: 99%

Perspectives on Designer Photocathodes for X-ray Free-Electron Lasers: Influencing Emission Properties with Heterostructures and Nanoengineered Electronic States

et al. 2018

View full text Add to dashboard Cite

The development of photoemission electron sources to specifically address the competing and increasingly stringent requirements of advanced light sources such as X-ray Free Electron Lasers (XFELs) motivates a comprehensive material-centric approach that integrates predictive computational physics models, advanced nano-synthesis methods, and sophisticated surface science characterization with in situ correlated study of photoemission performance and properties. Related efforts in material science are adopting various forms of nanostructure (such as compositionally graded stoichiometry in heterostructured architectures, and quantum features) allowing for tailored electronic structure to control and enhance opto-electronic properties. These methods influence the mechanisms of photoemission (absorption, transport, and emission) but have not, as yet, been systematically considered for use in photocathode applications. Recent results and near-term opportunities are described to exploit controlled functionality of nanomaterials for photoemission. An overview of the requirements and status is also provided.

show abstract

First operation of a high duty factor photoinjector

Cited by 13 publications

References 7 publications

Enhanced lifetime hybrid-diffuser cesium reservoir photocathode

Enhanced lifetime hybrid-diffuser cesium reservoir photocathode

Electron Injector Based on Thermionic RF-Modulated Electron Gun for Particle Accelerator Applications

Perspectives on Designer Photocathodes for X-ray Free-Electron Lasers: Influencing Emission Properties with Heterostructures and Nanoengineered Electronic States

Contact Info

Product

Resources

About