Performance of a DC GaAs photocathode gun for the Jefferson lab FEL

Siggins, T.; Sinclair, C. K.; Bohn, C.L.; Bullard, D.; Douglas, D.; Grippo, A.; Gubeli, J.; Krafft, Geoffrey; Yunn, B.

doi:10.1016/s0168-9002(01)01596-0

Cited by 60 publications

(35 citation statements)

References 5 publications

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“…Long-bunch operation implies the gun should operate at DC [10] or low-frequency rf [11], to minimize accelerating field effects. However DC and low-frequency guns are limited to achievable peak fields of less than 30 MV/m [12]. On the other hand, the two-frequency simulations indicate that rf fields of 100 MV/m can be made more linear, or DClike, with the addition of harmonics [9].…”

Section: Beam Dynamics Of Rf Photocathode Gunsmentioning

confidence: 99%

Towards advanced electron beam brightness enhancement and conditioning.

Kim¹,

Carlsten²,

Dowell³

et al. 2004

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Section: Beam Dynamics Of Rf Photocathode Gunsmentioning

confidence: 99%

Towards advanced electron beam brightness enhancement and conditioning.

Kim¹,

Carlsten²,

Dowell³

et al. 2004

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“…The cathode of this device has delivered in excess of 5.3 kilocoulombs from a single GaAs crystal with only occasional cleaning and re-cesiations required in its two and a half year life 4) . It delivers over 1% Fig.…”

Section: Injectormentioning

confidence: 99%

The Jefferson Lab Free Electron Laser Program

Neil¹,

Benson²,

Biallas³

et al. 2002

Jpn. J. Appl. Phys.

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A Free Electron Laser (FEL) called the IR Demo is operational as a user facility at Thomas Jefferson National Accelerator Facility in Newport News, Virginia, USA. It utilizes a 48 MeV superconducting accelerator that not only accelerates the beam but also recovers about 80% of the electron−beam power that remains after the FEL interaction. Utilizing this recirculation loop the machine has recovered cw average currents up to 5 mA, and has lased cw above 2 kW output at 3.1 microns. It is capable of output in the 1 to 6 micron range and can produce ~0.7 ps pulses in a continuous train at ~75 MHz. This pulse length has been shown to be nearly optimal for deposition of energy in materials at the surface. Upgrades under construction will extend operation beyond 10 kW average power in the near IR and produce multi-kilowatt levels of power from 0.3 to 25 microns. This talk will cover the performance measurements of this groundbreaking laser, scaling in near-term planned upgrades, and highlight some of the user activities at the facility.

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“…Cesium is adsorbed on the surface as a monolayer or sub-monolayer coating. Photocathodes using cesiated GaAs crystals are in operation and demonstrating good performance [1,2], with QEs of order 2-10% with a green drive laser. Similarly good results are possible with the evaporatively deposited alkali antimonides.…”

Section: Introductionmentioning

confidence: 99%