The Plasma Porthole: a windowless vacuum-pressure interface with various accelerator applications

Gerber, W.; Lanza, R.C.; Hershcovitch, A.; Stefan, P.; Castle, Charles; Johnson, E.

doi:10.1063/1.59299

Cited by 10 publications

(5 citation statements)

References 5 publications

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“…Later, a target at 2.85 bar absolute was isolated from vacuum (0.6 mbar) using a 2.36-mm diameter 40-mm long arc. When coupled to a threestage differential pumping system the background pressure of 5x10 -9 bar was reached [3].…”

Section: The Plasma Windowmentioning

confidence: 99%

Plasma Window for SNS Target

Raparia¹,

Hershcovitch²

2001

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Proton beam loss between the vacuum window and the target in the SNS ring to target beam transport can be completely eliminated, if Plasma Windows replace solid vacuum windows. Consequently, all problems associated with proton solid-window interaction will no longer exist. The Plasma Window is a novel apparatus, which utilized a short plasma arc to provide a vacuum-atmosphere interface without a ny intrusive solid structures. Extrapolating present technology to SNS implementation is a straightforward engineering issue. Among the many advantages that this technology offers are: elimination of a 4% proton beam loss, water removal from vacuum interface and elimination of radioactive water problems, as well as power and vacuum equipment savings.

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Section: The Plasma Windowmentioning

confidence: 99%

Plasma Window for SNS Target

Raparia¹,

Hershcovitch²

2001

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“…The boundary conditions at the electrode surface of the cathode are: (8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26) where γ is the effective coefficient of secondary emission and at the anode:…”

Section: Charge Particle Kinetics With Inclusion Of Induced Field Ionmentioning

confidence: 99%

Radiatively Driven Hypersonic Wind Tunnel (RDHWT) Program Magnetohydrodynamic Accelerator Research Into Advanced Hypersonics (MARIAH II)

Simmons¹

2000

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“…Gain over conventional differential pumping, by comparing pressures with plasma arc on versus plasma arc off, yielded a factor of 10 4 improvement. In that particular experiment [4] the vacuum system baseline pressure of 10 -6 Torr was reached 20" from the plasma window (which was opened to atmosphere).…”

Section: Previous Experimental Resultsmentioning

confidence: 99%

“…This plug allows the accelerated particles, or radiation to pass through while greatly reducing any flow between the high pressure and low pressure chambers. In the best results to date [4] of such a system, 40 psia were supported in the target chamber with 0.032 Torr in the first vacuum chamber.…”

Section: Introductionmentioning

confidence: 99%

“…A dramatic decrease [1,2,4] in the flow from the first vacuum chamber to the second vacuum chamber can, in principle (based on density and temperature profiles of similar arcs), be gained by adding skimmers to the first chamber. These internally cooled curved blades will serve to deflect the gas streaming from the cool annulus of the plasma window, as well as any gas which is not directly on the beam line.…”

Section: Possible Improvementsmentioning

confidence: 99%

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The plasma window: a windowless high pressure-vacuum interface for various accelerator applications

Hershcovitch

Johnson

Lanza

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)

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The Plasma Window is a stabilized plasma arc used as an interface between accelerator vacuum and pressurized targets. There is no solid material introduced into the beam and thus it is also capable of transmitting particle beams and electromagnetic radiation with low loss and of sustaining high beam currents without damage. Measurements on a prototype system with a 3 mm diameter opening have shown that pressure differences of more than 2.5 atmospheres can be sustained with an input pressure of ~ 10-6 Torr. The system is capable of scaling to higher-pressure differences and larger apertures. Various plasma window applications for synchrotron light sources, high power lasers, internal targets, high current accelerators such as the HAWK, ATW, APT, DARHT, spallation sources, as well as for a number of commercial applications, will be discussed.

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The Plasma Porthole: a windowless vacuum-pressure interface with various accelerator applications

Cited by 10 publications

References 5 publications

Plasma Window for SNS Target

Plasma Window for SNS Target

Radiatively Driven Hypersonic Wind Tunnel (RDHWT) Program Magnetohydrodynamic Accelerator Research Into Advanced Hypersonics (MARIAH II)

The plasma window: a windowless high pressure-vacuum interface for various accelerator applications

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