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Fast beam stacking using RF barriers
2007 IEEE Particle Accelerator Conference (PAC)
Year: 2007 | Conference Paper |
Two barrier RF systems were fabricated, tested and installed in the Fermilab Main Injector. Each can provide 8 kV rectangular pulses (the RF barriers) at 90 kHz. When a stationary barrier is combined with a moving barrier, injected beams from the Booster can be continuously deflected, folded and stacked in the Main Injector, which leads to doubling of the beam intensity. This paper gives a report ...Show More
High Power Phase Shifter
B. Foster;I. Gonin;T. Khabiboulline;A. Makarov;N. Solyak;I. Terechkine;D. Wildman
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
One of the approaches to power distribution system of a superconducting proton linac that is under discussion at Fermilab requires development of a fast-action, megawatt-range phase shifter. Using two phase shifters with a waveguide hybrid junction can allow independent control of phase and amplitude of RF power at the input of each superconducting cavity of the linac. This promises significant sa...Show More
Design of a New Main Injector Cavity for the Fermilab Proton Driver Era
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
In the design report of the Fermilab Proton Driver [1], the Main Injector (MI) needs to be upgraded to a 2 MW machine. For the Main Injector radiofrequency (rf) upgrade, R&D efforts are launched to design and build a new rf system. This paper presents the new cavity design study for the rf system. The cavity is simulated with the design code Mafia [2].Show More
Operational Performance of A Bunch by Bunch Digital Damper in the Fermilab Main Injector
P. Adamson;W.J. Ashmanskas;G.W. Foster;S. Hansen;A. Marchionni;D. Nicklaus;A. Semenov;D. Wildman;H. Kang
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
Cited by: Papers (2)
We have implemented a transverse and longitudinal bunch by bunch digital damper system in the Fermilab Main Injector, using a single digital board for all 3 coordinates. The system has been commissioned over the last year, and is now operational in all MI cycles, damping beam bunched at both 53MHz and 2.5MHz. We describe the performance of this system both for collider operations and high-intensit...Show More
Barrier RF System and Applications in Main Injector
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
A novel broadband RF system - the barrier RF - has been designed, fabricated and installed in the Fermilab Main Injector (MI). It uses nanocrystal magnetic alloy called Finemet and high voltage fast MOSFET switches. The system delivers ± 10 kV square pulses at 90 kHz. It can stack two proton batches injected from the Booster and squeeze them into the size of one so that the bunch intensity is incr...Show More
Upgrades of the Tevatron electron lens
X. Zhang;J. Crisp;J. Fitzgerald;G. Kuznezov;M. Olson;H. Pfeffer;G. Saewer;A. Semenov;V. Shiltsev;N. Solyak;D. Wildman;K. Bishofberger;E. Kashtanov;S. Kozub;L. Tkachenko;Sytnik;M. Tiunov
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Cited by: Papers (1)
This paper will describe the main upgrades of the Tevatron Electron Lens (TEL) during the year 2003. The bending angle of the electron beam entrance and exit to the main solenoid will be decreased from 90 degrees to 53 degrees and three more solenoids will be added to each of the two bends, which will allow us to control the electron beam size more freely. A new gun will also be installed which wi...Show More
Bunch-by-bunch digital dampers for the Fermilab main injector and recycler
G.W. Foster;S. Hansen;D. Nicklaus;W. Schappert;A. Seminov;D. Wildman;W. Ashmanskas
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Cited by: Papers (4)
A digital transverse and longitudinal bunch-by-bunch damper has been prototyped and tested. The damper is based on immediate 14-bit digitization at 212 MHz (4x the 53 MHz RF bunch frequency), digital pipelined processing in field-programmable gate array (FPGA) logic, and a digitally synthesized damping kick driven by a 212 MHz DAC. A single board performs all calculations for both transverse and l...Show More
Booster's coupled bunch damper upgrade
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Cited by: Papers (1)
A new narrowband active damping system for longitudinal coupled bunch (CB) modes in the Fermilab booster has recently been installed and tested. In the past, the booster active damper system consisted of four independent front-ends. The summed output was distributed to the 18, h=84 RF accelerating cavities via the RF fan-out system. There were several problems using the normal fan-out system to de...Show More
Barrier RF stacking at Fermilab
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Cited by: Papers (1)
A key issue to upgrade the luminosity of the Tevatron Run2 program and to meet the neutrino requirement of the NuMI experiment at Fermilab is to increase the proton intensity on the target. This paper introduces a new scheme to double the number of protons from the Main Injector (MI) to the pbar production target (Run2) and to the pion production target (NuMI). It is based on the fact that the MI ...Show More
A trio of modulators for the Fermilab Tevatron Electron Lens project
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (1)
Three high voltage modulators used during testing and operation of the Tevatron Electron Lens (TEL) at Fermilab will be described. Short high voltage (0 to /spl sim/20 kV) pulses from these modulators vary the anode-cathode voltage of the TEL electron gun to control the magnitude of the electron beam current. The trio of modulators include a low repetition rate MOSFET-based pulser, a fast ionizati...Show More
Recent experience with inductive insert at PSR
K.Y. Ng;D. Wildman;M. Popovic;A. Browman;D. Fitzgerald;R. Macek;M. Plum;T. Spickermann
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
In a Fermilab-Los Alamos collaboration, inductances constructed of ferrite cores sufficient to cancel a large fraction of the space charge potential-well distortion were installed in the Los Alamos Proton Storage Ring (PSR) as one means of raising the threshold for the two-stream e-p instability. When operating at higher intensities and with sufficient inductance added for full space-charge compen...Show More
Electron proton two-stream instability at the PSR
R.J. Macek;A. Browman;D. Fitzgerald;R. McCrady;F. Merrill;M. Plum;T. Spickermann;T.S. Wang;J. Griffin;K.Y. Ng;D. Wildman;K. Harkay;R. Kustom;R. Rosenberg
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (7)
A strong, fast, transverse instability has long been observed at the Los Alamos Proton Storage Ring (PSR) where it is a limiting factor on peak intensity. Most of the available evidence, based on measurements of the unstable proton beam motion, is consistent with an electron-proton two-stream instability. The need for higher beam intensity at PSR and for future high-intensity, proton drivers has m...Show More
Beam-beam compensation in Tevatron: status report
V. Shiltsev;G. Kuznetsov;N. Solyak;D. Wildman;Zhang XL;Yu. Alexahin;K. Bishofberger
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (2)
The project of beam-beam compensation (BBC) in the Tevatron using electron beams has passed a successful first step in experimental studies. The first Tevatron electron lens (TEL) has been installed in the Tevatron, commissioned, and demonstrated the theoretically predicted shift of betatron frequencies of a high energy proton beam due to a high current low energy electron beam. After the first se...Show More
A prototype 7.5 MHz Finemet(R) loaded RF cavity and 200kW amplifier for the Fermilab Proton Driver
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
A 7.5 MHz RF cavity and power amplifier have been built and tested at Fermilab as part of the proton Driver Design Study. The project goal was to achieve the highest possible 7.5 MHz accelerating gradient at 15 Hz with a 50% duty cycle. To reduce beam loading effects, a low shunt impedance (500/spl Omega/) design was chosen. The 46cm long single gap cavity uses 5 inductive cores, consisting of the...Show More
RF manipulations in the Fermilab Main Injector
Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)
Year: 1999 | Conference Paper |
The Fermilab Main Injector will have a multifunctional role in the Run II Collider run. It will not only provide beam for antiproton stacking and intense proton and antiproton bunches to the Tevatron collider, but will also decelerate antiprotons for recycling in the new Recycler Ring. To accomplish these goals a series of RF manipulations will be needed.Show More
Wideband RF system for the Fermilab Recycler Ring
Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)
Year: 1999 | Conference Paper |
Cited by: Papers (3)
A broadband RF system has been built for the new Fermilab Recycler Ring. It is designed to both bunch and capture beam during transfers and create multiple, moveable RF barrier buckets for azimuthal control of the stored antiproton beam. Beam will be bunched and captured using bursts of four RF cycles at 2.5 MHz. To maximize bucket area, the multiple barrier buckets will be generated by pairs of 2...Show More
Prototype "electron lens" set-up for the Tevatron beam-beam compensation
C. Crawford;F. Niell;G. Saewert;J. Santucci;A. Sery;A. Shemyakin;V. Shiltsev;D. Wildman;A. Aleksandrov;L. Arapov;G. Kuznetsov;P. Logachov;A. Sharapa;B. Skarbo;B. Sukhina
Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)
Year: 1999 | Conference Paper |
Cited by: Papers (3)
A prototype "electron lens" for the Tevatron beam-beam compensation project is commissioned at Fermilab. We describe the set-up, report results of the first tests of the electron beam, and discuss future plans.Show More
In Fermilab's Main Ring bunch coalescing is used to produce intense proton and antiproton bunches for the Tevatron. For the bunch coalescing, 11 proton or antiproton bunches are rotated first in the fundamental RF harmonic of 53 MHz to reduce the momentum spread, then are rotated for a quarter of a period in a lower harmonic (h=53 or 2.5 MHz) and recaptured in a single 53 MHz bucket. The 2.5 volta...Show More
A new RF system for improving both the proton and antiproton bunch coalescing efficiencies has been installed in the Fermilab Main Ring. The system consists of five, ferrite-loaded RF cavities operating at a fixed frequency of 2.5 MHz and a second harmonic cavity at 5.0 MHz. Each cavity is driven by a 5 kW solid-state power amplifier and can produce a peak accelerating gap voltage greater than 15 ...Show More
In Fermilab's Main Ring a fast coalescing scheme called Snap coalescing has replaced the slower adiabatic coalescing. In Snap coalescing the adiabatic voltage reduction to reduce the dp/p of the bunch has been replaced with a quarter of a synchrotron period rotation in a 53-MHz bucket. A 106 MHz second harmonic cavity has been constructed to help linearize the 53 MHz rotation and reduced the minim...Show More
The shunt impedance and frequency of the higher order modes [HOM] of the Main Ring Cavity (h=1113) at Fermilab were measured using the stretched wire method. The results of the stretched wire measurements and a cavity transmission line model of the modes are given.Show More
HOM RF cavity dampers for suppressing coupled bunch instabilities in the Fermilab Booster
Proceedings of International Conference on Particle Accelerators
Year: 1993 | Conference Paper |
Cited by: Papers (3)
The coupled bunch mode n=16 longitudinal instability observed in the Fermilab Booster has been successfully damped by installing a set of passive higher-order mode (HOM) dampers in the 17 Booster RF cavities. The Booster is a fast cycling 8 GeV proton synchrotron with harmonic number 84. The dampers remove energy from two cavity modes at 165 and 217 MHz. The addition of these dampers to the RF cav...
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First Page of the Article
Show MoreThe high level RF system for transition crossing without RF focusing in the main ring at Fermilab
Proceedings of International Conference on Particle Accelerators
Year: 1993 | Conference Paper |
Cited by: Papers (3)
A new method for crossing transition at the Fermilab Main Ring has been developed. Near transition a third harmonic component is added to the fundamental RF voltage producing a flattened RF waveform. To generate this waveform required the development of a third harmonic system consisting of a 159 MHz cavity, a perpendicularly biased tuner,and a 10 kW power amplifier. The cavity is a modified CERN ...Show More
Operational experience with third harmonic RF cavity for improved beam acceleration through transition in the Fermilab Main Ring
C.M. Bhat;J. Dey;J. Griffin;I. Kourbanis;J. MacLachlan;M. Martens;I. Meisner;I.Y. Ng;J. Shan;D. Wildman
Proceedings of International Conference on Particle Accelerators
Year: 1993 | Conference Paper |
Cited by: Papers (4)
An RF cavity operating at three times the frequency of the present Main Ring RF system at Fermilab has been installed to minimize the beam loss and longitudinal emittance (/spl epsivsub l/) growth related to the transition crossing. Tests have been carried out with beam intensities ranging from 3/spl times/10/sup 9/ to 2.3/spl times/10/sup 10/ ppb and /spl epsivsub lspl sime/0.07 eVs. No beam loss...
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First Page of the Article
Show MoreTransient beam loading reduction during multi-batch coalescing in the Fermilab main ring
Conference Record of the 1991 IEEE Particle Accelerator Conference
Year: 1991 | Conference Paper |
Increasing the number of proton bunches in the Tevatron Collider from 6 to 36 places new demands on the bunch coalescing process in the Main Ring. As many as 132 proton bunches may have to be simultaneously coalesced into 12 high-intensity bunches before being injected into the Tevatron. In order to efficiently produce these high-intensity bunches, the total Main Ring RF cavity fundamental voltage...Show More
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