E. Hartwig

University of California, Berkeley

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

A. Faltens

Lawrence Berkeley National Laboratory

Warren W. Chupp

Lawrence Berkeley National Laboratory

D. Keefe

Lawrence Berkeley National Laboratory

R. Avery

Lawrence Berkeley National Laboratory

D. Vanecek

Lawrence Berkeley National Laboratory

W. Salsig

Forest Products Laboratory

L.J. Laslett

University of California, Berkeley

R. Nemetz

Lawrence Berkeley National Laboratory

G.R. Lambertson

Lawrence Berkeley National Laboratory

Michael Tiefenback

Thomas Jefferson National Accelerator Facility

Cooperative Institutions

Lawrence Berkeley National Laboratory

University of California, Berkeley

Stanford University

Fusion Academy

Lawrence Livermore National Laboratory

Stanford Synchrotron Radiation Lightsource

University of California System

SLAC National Accelerator Laboratory

Fusion (United States)

Menlo School

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Electron ring program at Lawrence Berkeley Laboraory

Warren W. Chupp A. Faltens E. Hartwig

with the magnitudes of the fluctuations found in the natural background radiation. Considerable effort has, therefore, been expended in understanding the magnitude of the components of natural background at the Lawrence Berkeley Laboratory, so that the magnitude of Laboratory-produced radiation may be accurately determined. Environmental monitoring of accelerator-produced radiation and of radionuclides is carried on throughout the Laboratory, at the Laboratory perimeter, and in the regions surrounding the Laboratory. The techniques and models used to calculate population exposure are described and discussed. (auth)

National laboratory

10.2172/4268584

Cite

Citations (0)

Operating Experience with a High Current Cs+1 Injector for Heavy Ion Fusion

IEEE Transactions on Nuclear Science (1981)

Warren W. Chupp A. Faltens E. Hartwig E. Hoyer D. Keefe

The construction and assembly of a Cs ion injector consisting of a pulsed source and 3 pulsed drift tubes has been complete since April, 1980. The measurement program, underway since then to characterize the beam, has been interspersed with the development of diagnostic equipment. The Cs contact ionization source and each of the 3 drift tubes are driven by 500 kV Marx generators. The injector has been operated reliably at 300 kV/stage at a repetition rate of 1 pulse/4 sec. About 105 pulses have been accumulated. The space charge limited diode and drift tube acceleration system were designed with the aid of the EGUN code of Herrmannsfeldt. Measurements of the beam envelope have been made by means of a movable biased charge collector. Good agreement with the EGUN calculation is found. Measurements of the beam emittance have been made at the exit of the third drift tube. The normalized emittance π εN = 2 x 10 ^-6 &#x-003C0; m-rad is of better optical quality than that required for further acceleration and transport in a Heavy Ion Fusion (HIF) Induction Linac Driver.

Beam emittance

10.1109/tns.1981.4332113

Cite

Citations (5)

A Quadrupole Beam Transport Experiment for Heavy Ions under Extreme Space Charge Conditions

IEEE Transactions on Nuclear Science (1983)

Warren W. Chupp A. Faltens E. Hartwig D. Keefe C. H. Kim

A Cs ion-beam transport experiment is in progress to study beam behavior under extreme space charge conditions. A five-lens section matches the beam into a periodic electrostatic quadrupole FODO channel and its behavior is found to agree with predictions. With the available parameters (⩽200 keV, ⩽20 mA, πε _n ⩾ 10 ^-7 π rad-m, up to 41 periods) the transverse (betatron) oscillation frequency (γ) can be depressed down to one-tenth of its zero current value (γ _o ), where γ ² = γ ² _o - ω ² _p /2, and ω _p is the beam plasma frequency. The current can be controlled by adjustment of the gun and the emittance can be controlled independently by means of a set of charged grids.

10.1109/tns.1983.4332877

Cite

Citations (6)

Heavy ion induction linacs for ICF

A. Faltens E. Hartwig E. Hoyer D. Keefe L.J. Laslett

A review of some of the main characteristics of present day induction linacs is given. (MOW)

Source

Cite

Citations (1)

PULSED ACCELERATING COLUMN AND PULSED MAGNETIC FIELD FOR THE ELECTRON RING ACCELERATOR.

A. Faltens E. Hartwig Perez Hernandez

Source

Cite

Citations (0)

Preliminary Hardware Concepts for a High-Energy Electron-Ring Accelerator

IEEE Transactions on Nuclear Science (1971)

A. Faltens E. Hartwig D. Keefe W. Salsig

Results of the first study of the conceptual design of a collective-effect proton accelerator of substantial energy (65-100 GeV) are described. Basic theoretical considerations are outlined and components and their arrangement for a conceptual accelerator are discussed. This first study shows that the promise of ERA principle to produce remarkably compact accelerators can be achieved by use of single-pulse surge-excited acceleration cavities. The example single-pass machine provides accelerating gradients of 250 MeV/meter overall where conventional synchrotrons yield 4o-80 MeV/ meter. The relaxed tolerances of the surge-excited cavities and their associated components allow great advantage to be taken of mass-production techniques with ensuing low cost (≲ M$ 0.24/GeV).

Conceptual design

10.1109/tns.1971.4326094

Cite

Citations (4)

Kazimierz nad Wisłą

E. Hartwig Karol Siciński

Source

Cite

Citations (0)

Functionalized Resistance Welding Control

Transactions of the American Institute of Electrical Engineers (1947)

C. B. Stadum W. E. Large E. Hartwig

In the past, it has been necessary because of unco-ordinated circuit design to build synchronous-precision welding controls which were useful for only one application. By redesigning the welding control circuits and mechanically separating each basic electrical function, a versatile line of welding controls has been obtained. This paper describes some of the redesigned circuits in the new line of welding controls.

Welding power supply

Line (geometry)

10.1109/t-aiee.1947.5059457

Cite

Citations (0)

Quadrupole beam-transport experiment for heavy ions under extreme space charge conditions. [Cesium ion beams at 2 MeV and 1 ampere]

Warren W. Chupp A. Faltens E. Hartwig

A Cs ion-beam-transport experiment is in progress to study beam behavior under extreme space-charge conditions. A five-lens section matches the beam into a periodic electrostatic quadrupole FODO channel and its behavior is found to agree with predictions. With the available parameters (less than or equal to 200 keV, less than or equal to 20 mA, ..pi..epsilon/sub n/ greater than or equal to 10/sup -7/ ..pi.. rad-m, up to 41 periods) the transverse (betatron) occillation frequency (nu) can be depressed down to one-tenth of its zero current value (nu/sub 0/), where nu/sup 2/ = nu/sub 0//sup 2/ -..omega../sub p//sup 2//2, and ..omega../sub p/ is the beam plasma frequency. The current can be controlled by adjustment of the gun and the emittance can be controlled independently by means of a set of charged grids.

Beam emittance

Betatron

Source

Cite

Citations (0)

[Lublin, ul. Grodzka. Brama Grodzka]

E. Hartwig

Brama Grodzka jest jednym z pierwszych murowanych elementow obwarowan miasta wybudowanych w 1342 r. Pierwotnie miala okolo 12 metrow wysokości. W latach 60. XVI wieku dobudowano przedbramie. Na pocz. XVII w. otrzymala drugą kondygnacje. W 1785 r. (remont) zmieniono jej funkcje z obronnej na mieszkalno-handlową. Rozbudowa kamienic w latach 60. i 80. XIX wieku spowodowala, ze brama przestala byc budynkiem wolnostojącym. W 1942 r. mial miejsce pozar dachu bramy. W 1945 roku osunela sie oficyna przylegających budynkow. Zniszczen dopelnilo osuniecie sie skrajnych oficyn kamienicy Grodzka 36A. W 1945 r.roku miasto przejelo budynek. W 1954 r. zakonczono remont bramy. Obiekt oddano do uzytku Liceum Sztuk Plastycznych. Od 1992 roku budynek uzytkuje Ośrodek „Brama Grodzka – Teatr NN”.

Source

Cite

Citations (0)