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K. Bishofberger

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Full Name: K. Bishofberger

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8 papers
title: Successful beam-beam tuneshift compensation
format: thesis
year: 2005
1 author: Kip Bishofberger
abstract: The performance of synchrotron colliders has been limited by the beam-beam limit, a maximum tuneshift that colliding bunches could sustain. Due to bunch-to-bunch tune variation and intra-bunch tune spread, larger tuneshifts produce severe emittance growth. Breaking through this constraint has been viewed as impossible for several decades. A device known as the Tevatron Electron Lens (TEL) has been designed, constructed, and tested in the Tevatron at Fermilab. This device produces a pulsed beam of electrons which interact with the antiproton bunches in the Tevatron. The peak beam current is typically 2 A, and the beam energy can range from 4 keV to 12 keV. The bunches interact with the beam
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title: Plasma Wakefield Experiments
format: conference proceeding
conference: AAC 2002 10th
year: 2002
6 authors: N. Barov | M.C. Thompson | K. Bishofberger | J.B. Rosenzweig | H. Edwards | J. Santucci
abstract: We discuss the recent experiments in the field of Plasma Wakefield Acceleration (PWFA), with emphasis on the FNAL experiment. After completion of this work, the next round of experiments will need to push the envelope on accelerating gradient, interaction length, stability, and accelerated charge. We present theoretical results dealing with plasma accelerator performance in the limit of high driver charge, and short wavelengths. We comment on the impact of such results on both the afterburner (single module) and staged (multiple modules) approaches to plasma-based accelerators.
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title: Ultra high-gradient energy loss by a pulsed electron beam in a plasma
format: conference proceeding
conference: PAC 2001
year: 2001
9 authors: N. Barov | K. Bishofberger | J.B. Rosenzweig | J.P. Carneiro | P. Colestock | H. Edwards | Fitch, M. J. | W. Hartung | J. Santucci
abstract: The plasma wake-field mechanism can be used to couple energy at a high rate from a bunched electron beam into a plasma wave. We will present results from the Fermilab A0 facility where a beam with an initial energy of 14 MeV passes through the plasma to emerge with a much broader energy spread, spanning from a low of 3 MeV to a high of over 20 MeV. Over the 8 cm length of the 10(14) cm(-3) plasma, this implies a 140 MeV/m deceleration and 72 MeV/m acceleration gradient. (12 References).
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title: Commissioning of the Neptune photoinjector
format: conference proceeding
conference: PAC 1999
year: 1999
21 authors: S. Boucher | P. Musumeci | Loh, M. | Burke, A. | S. Anderson | J.B. Rosenzweig | K. Bishofberger | X. Ding | Holden, T. | A. Murokh | C. Pellegrini | Suk, H. | A. Tremaine | C. Clayton | C. Joshi | Marsh, K. | P. Muggli | M.C. Thompson | S. Anderson | R. Agustsson | R. J. England
abstract: The status of the commissioning of the RF photoinjector in the Neptune advanced accelerator laboratory is discussed. The component parts of the photoinjector, the RF gun, photocathode drive laser system, booster linac, RF system, chicane compressor, beam diagnostics systems, and control system are described. This injector is designed to produce short pulse length, high brightness electron beams. Experiments planned for the immediate future are described. Initial measurements of various beam parameters are presented. (10 References).
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title: Measurements of High Gain and Intensity Fluctuations in a Self-Amplified, Spontaneous-Emission Free-Electron Laser
format: journal article
publisher: Physical Review Letters
year: 1998
12 authors: M. Hogan | C. Pellegrini | J.B. Rosenzweig | G. Travish | A. A. Varfolomeev | S. Anderson | K. Bishofberger | Pedro Frigola | A. Murokh | N. Osmanov | Sven Reiche | A. Tremaine
abstract: We report measurements of large gain for a single pass free-electron laser operating in self-amplified spontaneous emission (SASE) at 16 mm starting from noise. We also report the first observation and analysis of intensity fluctuations of the SASE radiation intensity in the high gain regime. The results are compared with theoretical predictions and simulations.
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title: The Neptune photoinjector
format: conference proceeding
conference: ICFA Second Generation Plasma Acceleration Workshop
year: 1998
12 authors: J.B. Rosenzweig | S. Anderson | K. Bishofberger | X. Ding | A. Murokh | C. Pellegrini | Suk, H. | A. Tremaine | C. Clayton | C. Joshi | Marsh, K. | P. Muggli
abstract: The RF photoinjector in the Neptune advanced accelerator laboratory, along with associated beam diagnostics, transport and phase-space manipulation techniques are described. This versatile injector has been designed to produce short-pulse electron beams for a variety of uses: ultra-short bunches for injection into a next-generation plasma beatwave acceleration experiment, space-charge dominated beam physics studies, plasma wake-field acceleration driver, plasma lensing, and free-electron laser microbunching techniques. The component parts of the photoinjector, the RF gun, photocathode drive laser systems, booster linac, RF system, chicane compressor, beam diagnostic systems, and control system, are discussed. The present status of photoinjector commissioning at Neptune is reviewed, and proposed experiments are detailed. (33 References).
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title: Measurements of high gain and noise fluctuations in a SASE free electron laser
format: conference proceeding
conference: FEL 1997 19th
year: 1998
12 authors: M. Hogan | S. Anderson | K. Bishofberger | P. Frigola | A. Murokh | N. Osmanov | C. Pellegrini | S. Reiche | J.B. Rosenzweig | G. Travish | A. Tremaine | A.A. Varfolomeev
abstract: We report measurements of large gain for a single pass free-electron laser operating in self-amplified spontaneous emission (SASE) at 16 mu m starting from noise. We also report the first observation and analysis of intensity fluctuations of the SASE radiation intensity in the high-gain regime. The results are compared with theoretical predictions and simulations. (11 References).
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title: Measurements of high gain and noise fluctuations in a SASE free electron laser
format: conference proceeding
conference: Workshop on Single Pass, High Gain FELs Starting from Noise Aiming at Coherent X-Rays
year: 1997
12 authors: M. Hogan | S. Anderson | K. Bishofberger | Pedro Frigola | A. Murokh | N. Osmanov | C. Pellegrini | Sven Reiche | J.B. Rosenzweig | G. Travish | A. Tremaine | A. A. Varfolomeev
abstract: We report measurements of large gain for a single pass Free Electron Laser operating in Self Amplified Spontaneous Emission (SASE) at 16 mu m starting from noise. We also report the first observation and analysis of intensity fluctuations of the SASE radiation intensity in the high gain regime. The results are compared with theoretical predictions and simulations. (11 References).
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