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Preparing accelerator systems for the RHIC sextant commissioning

Description: The Relativistic Heavy Ion Collider (RHIC) construction is progressing steadily towards completion in 1999 when beams will circulate in both collider rings. One of the major tests of the RHIC project was the commissioning of the first sextant with gold ion beams in early 1997. This is a report on preparation of the RHIC accelerator systems for the first sextant test. It includes beam position monitors, timing, injection correction through the magnetic septum and kickers, current transformers, f… more
Date: July 1, 1997
Creator: Trbojevic, D.; Pilat, F. & Ahrens, L.
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Partner: UNT Libraries Government Documents Department
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RHIC beam loss monitor system design

Description: The Beam Loss Monitor (BLM) System is designed to prevent the quenching of RHIC magnets due to beam loss, provide quantitative loss data, and the loss history in the event of a beam abort. The system uses 400 ion chambers of a modified Tevatron design. To satisfy fast (single turn) and slow (100 msec) loss beam criteria and provide sensitivity for studies measurements, a range of over 8 decades is needed. An RC pre-integrator reduces the dynamic range for a low current amplifier. This is digiti… more
Date: July 1, 1997
Creator: Witkover, R.; Zitvogel, E. & Michnoff, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A multi-wire beam profile monitor in the AGS

Description: A multi-wire beam profile monitor which can be used to directly monitor and control the optical matching between the Booster and AGS rings has been installed and tested in the AGS. Placement of a multi-wire monitor directly in the AGS provides profile measurements taken upon injection and the first two or more revolutions of the beam. The data from such measurements can be used to determine the optical properties of the beam transport line leading into the AGS.
Date: July 1, 1997
Creator: Huang, H.; Buxton, W.; Castillo, V. & Glenn, J.W.
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Partner: UNT Libraries Government Documents Department
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Observation of dark-current signals from the S-band structures of the SLAC linac

Description: It is well known that the electro-magnetic fields in high-gradient RF structures can cause electron emission from the metallic structure walls. If the emitted electrons are captured and accelerated by the accelerating fields so-called dark-current is induced. Dark-currents have been measured and studied for various RF-structures. In this paper the authors present measurements of RF induced signals for the SLC S-band structures. For nominal gradients of 17 MV/m it is shown that the dark-current … more
Date: July 1, 1997
Creator: Assmann, R.; Decker, F.J.; Seidel, M.; Siemann, R.H. & Whittum, D.
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Partner: UNT Libraries Government Documents Department
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Fast PIN-diode beam loss monitors at Tevatron

Description: The article is devoted to results of fine time structure of particle losses in Tevatron with use of fast beam loss monitors (BLM) based on PIN-diodes. An ultimate goal of the new BLMs is to distinguish losses of protons and antiprotons from neighbor bunches with 132 ns bunch spacing in the Tevatron collider upgrade. The devices studied fit well to the goal as they can recognize even seven times closer - 18.9 ns - spaced bunches` losses in the Tevatron fixed target operation regime. We have meas… more
Date: July 1, 1997
Creator: Shiltsev, V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A proposal for a 1 GeV plasma-wakefield acceleration experiment at SLAC

Description: A plasma-based wakefield acceleration (PWFA) experiment is proposed that will accelerate parts of an SLC bunch by up to 1 GeV/m over a length of 1 m. A single SLC bunch is used to both induce wakefields in the one meter long plasma and to witness the resulting beam acceleration. The proposed experiment will explore and further develop the techniques that are needed to apply high-gradient plasma wakefield acceleration to large scale accelerators. The one meter length of the experiment is about t… more
Date: July 1, 1997
Creator: Katsouleas, T.; Lee, S. & Assmann, R.
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Partner: UNT Libraries Government Documents Department
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Performance of the upgraded NSLS beam position monitors

Description: The design and initial performance of the original NSLS beam position monitor were described by J. Bittner and R. Biscardi in 1989. The receiver, which processes signals from four button type pick-up electrodes by time-division multiplexing, operates at the third harmonic of the ring rf frequency (158.66 MHz). It has an output bandwidth of about 2 kHz and a dynamic signal range of approximately 36 dB. A total of 92 receivers have been installed in the NSLS X-ray and VUV storage rings for orbit … more
Date: July 1, 1997
Creator: Nawrocky, R.J. & Keane, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A prototype ionization profile monitor for RHIC

Description: Transverse beam profiles in the Relativistic Heavy-Ion Collider (RHIC) will be measured with ionization profile monitors (IPM`s). Each IPM collects and measures the distribution of electrons in the beamline resulting from residual gas ionization during bunch passage. The electrons are swept transversely from the beamline and collected on strip anodes oriented parallel to the beam axis. At each bunch passage the charge pulses are amplified, integrated, and digitized for display as a profile hist… more
Date: July 1, 1997
Creator: Connolly, R.; Cameron, P. & Ryan, W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A scanning target profile monitor for the slow extracted beam at the AGS

Description: The purpose of this new instrument is for probing beam halo and obtaining beam profiles of the resonant extracted beam at the AGS. The device described here is a prototype version, to obtain data and prepare for a more permanent device. The goals of the permanent device are to allow emittances of low current, but high intensity slowly extracted beams to be accurately measured and to have a diagnostic for probing the wings of the beam distribution. The device works on secondary emission from thi… more
Date: July 1, 1997
Creator: Brown, K. A.; Chiang, I. H. & Gassner, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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APT related papers presented at the 1997 particle accelerator conference, Vancouver, May 12--16, 1997

Description: Tritium is essential for the US nuclear weapons to function, but because it is radioactive with a half-life of 12.3 years, the supply must be periodically replenished. Presently, only reactor or accelerator systems can be used to produce tritium. This report is a compilation of 31 papers given at the 1997 Particle Accelerator Conference which dealt with the accelerator production of tritium. The papers are grouped into two categories, invited and contributed.
Date: July 1, 1997
Creator: Lawrence, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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