R. Webber

Fermi National Accelerator Laboratory

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Co-Authors

R. Madrak

Fermi National Accelerator Laboratory

D. Wildman

Fermi National Accelerator Laboratory

J. Steimel

Fermi National Accelerator Laboratory

T. Khabiboulline

Fermi National Accelerator Laboratory

R. Wagner

Argonne National Laboratory

F. Marti

Michigan State University

Q. Kerns

Fermi National Accelerator Laboratory

G. Apollinari

Fermi National Accelerator Laboratory

M. Leitner

Lawrence Berkeley National Laboratory

J. Ozelis

Fermi National Accelerator Laboratory

Cooperative Institutions

Fermi National Accelerator Laboratory

465

Michigan State University

246

European Organization for Nuclear Research

190

Linde (United States)

178

Cryogenic Industries (United States)

168

Cryomagnetics (United States)

149

Fermi Research Alliance

National and Kapodistrian University of Athens

Brookhaven National Laboratory

SLAC National Accelerator Laboratory

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High gradient test of the HINS SSR1 single spoke resonator

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2008)

I. Gonin T. Khabibouline Giobatta Lanfranco A. Mukherjee J. Ozelis

Eighteen {beta} = 0.21 superconducting single spoke resonators comprise the first state in the cold section of the 8-GeV H{sup -} Linac for Fermilab's proposed Project X. After Buffered Chemical Polishing and High Pressure Rinse, one resonator has undergone high gradient RF testing at 2.0-4.5 K in the Vertical Test Stand at Fermilab. They present measurements of the surface resistance as a function of temperature and the quality factor as a function of accelerating field. The resonator reached an accelerating field of 18.0 MV/m.

Spoke-hub distribution paradigm

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Citations (8)

Simultaneous Position Measurements of Protons and Anti-Protons in the Tevatron

Proceedings of the 2003 Particle Accelerator Conference (2006)

R. Kutschke J. Steimel R. Webber S. Wolbers

Fermilab is nearing completion of an upgrade to the electronics of the Beam Position Monitor (BPM) system that measures the transverse position of the beams inside the Tevatron collider. A new feature in the upgraded system is the ability, when both protons and anti-protons are present in the Tevatron, to make simultaneous measurements of the closed orbit position of both beam species. This paper will present one of the methods for achieving the simultaneous measurement and will present results from commissioning data, which demonstrate that the system achieves its requirements.

Fermilab

Upgrade

Position (finance)

10.1109/pac.2005.1590853

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Citations (7)

FRIB ACCELERATOR STATUS AND CHALLENGES

J. Wei EP Bernard Nathan Bultman F. Casagrande S. Chouhan

The Facility for Rare Isotope Beams (FRIB) at MSU includes a driver linac that can accelerate all stable isotopes to energies beyond 200 MeV/u at beam powers up to 400 kW. The linac consists of 330 superconducting quarter- and half-wave resonators operating at 2 K temperature. Physical challenges include acceleration of multiple charge states of beams to meet beam-on-target requirements, efficient production and acceleration of intense heavy-ion beams from low to intermediate energies, accommodation of multiple charge stripping scenarios (liquid lithium, helium gas, and carbon foil) and ion species, designs for both baseline in-flight fragmentation and ISOL upgrade options, and design considerations of machine availability, tunability, reliability, maintainability, and upgradability. We report on the FRIB accelerator design and developments with emphasis on technical challenges and progress.

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Maintainability

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Operational experience with beam loss, shielding and residual radiation in the Fermilab proton source

R. Webber

A report on beam loss, radiation shielding, and residual radiation experiences and status in the Fermilab Linac and Booster is presented. Historically, the Linac/Booster system has served only as an injector for the relatively low repetition rate Main Ring synchrotron. With the construction of an 8 GeV target station for the 5 Hz MiniBooNE neutrino beam and rapid multi-batch injection into the Main Injector for the NUMI experiment, the demand for Booster protons will increase dramatically over the next few years. Booster beam loss reduction and control are key to the entire future Fermilab high energy physics program.

Fermilab

Booster (rocketry)

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Citations (1)

An R.f. Device for Precision Location of the Beam Position Detectors in the Energy Saver

IEEE Transactions on Nuclear Science (1983)

Q. Kerns G. Biallas F. Turkot R. Webber A. Wehmann

The task is to measure the center line of the beam detector with respect to the magnetic centerline with a precision of +-0.2 mm; the measurement must be made on 250 magnets (they come in 6 lengths, from 25'' to 99'') by a technician. Optical, mechanical, and electrical techniques for carrying out this procedure were considered. An RF device operating at 53 MHZ was adopted for the following reasons: (a) it provides complete electrical checkout of the hardware at operating frequency, including the bidirectional operation of the pickup, (b) no mechanical contact with the strip lines is required, and (c) the demands of production measurements and maintenance of calibration are better matched to the skills of an average technician. We describe the conceptual design, fabrication, and performance of this device.

Position (finance)

Beam energy

10.1109/tns.1983.4332778

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Citations (2)

Overview of Beam Diagnostic Systems for FRIB

4th International Beam Instrumentation Conference (IBIC2015), Melbourne, Australia, 13-17 September 2015 (2016)

S. Lidia S. Cogan Dylan Constan-Wahl Jenna Crisp Masanori Ikegami

10.18429/jacow-ibic2015-mopb071

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Single bunch intensity monitoring system using an improved wall current monitor

C. D. Moore J. Crisp David M. Howard Q. Kerns Peter Martin

The length and intensity of individual beam bunches are important parameters in collider operations. A system for automatically measuring these parameters has been developed using a wall current monitor signal digitized by a 1 GHz sampling oscilloscope under microprocessor control. Bunch length and intensity are computed by the microprocessor and presented to the host computer. To verify the accuracy required, attention was given to the system's calibration and frequency response. The system has been successfully used to monitor colliding beam operations at Fermilab. The current 5% accuracy in measuring single-bunch intensity demonstrates the excellent fidelity and bandwidth of the system. The design of a resistive wall monitor with 3 kHz to 6 GHz bandwidth and less than 1 dB amplitude variation is presented. Using a microwave absorber inside the vacuum chamber to reduce noise is discussed.< >

Bunches

Microprocessor

Intensity

Resistive touchscreen

Photodiode

Fermilab

10.1109/pac.1989.73497

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Citations (17)

SYNCHRONIZATION OF THE FERMILAB BOOSTER AND MAIN INJECTOR FOR MULTIPLE BATCH INJECTION

R. Zwaska S. Köpp W. Pellico R. Webber

To date, the 120 GeV Fermilab Main Injector accelerator has accelerated a single batch of protons from the 8 GeV rapid-cycling Booster synchrotron for production of antiprotons for Run II. In the future, the Main Injector must accelerate 6 or more Booster batches simultaneously; the first will be extracted to the antiproton source, while the remaining are extracted for the NuMI/MINOS (Neutrinos at the Main Injector/Main Injector Neutrino Oscillation Search) neutrino experiment. Performing this multi-batch operation while avoiding unacceptable radioactivation of the beamlines requires a previously unnecessary synchronization between the accelerators. We describe a mechanism and present results of advancing or retarding the longitudinal progress of the Booster beam by active feedback radial manipulation of the beam during the acceleration period.

Booster (rocketry)

Fermilab

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A bipolar integrator for secondary emission profile monitors at the SSCL

P. Datte D. Beechy R. Webber

Many invasive techniques for monitoring beam profile and intensity require secondary emission signals in order to make the measurement. Signal acquisition and processing can take many forms. This paper describes a bipolar integration technique which uses the Burr-Brown ACF2101 Dual Switched Integrator chip and applications for accelerator beam instrumentation.

Instrumentation

SIGNAL (programming language)

10.2172/67477

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RF CAVITY PHASE CALIBRATION USING ELECTROMAGNETIC PICKUPS

Bojan Đuričković J. Crisp G. Kiupel M. Leitner Jorge Torres-Rodríguez

A method is presented using electromagnetic pickup probes for RF cavity phase calibration. (We used capacitive style pickup probes.) Pickup probes provide fast readings, and measurements of the phase difference between a pair of pickup probes provides enough information about the phase-energy curve to yield a fit for the zero-crossing phase. We present an overview of the algorithm and measurement results of an implementation on the ReA3 reaccelerator.

Pickup

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Citations (2)