BPM System for Electron Cooling in the Fermilab Recycler Ring (original) (raw)

Test of a full-scale prototype of the Fermilab electron cooler

The Fermilab's Recycler ring will employ an electron cooler to store and cool 8.9 GeV antiprotons [1]. The cooler is based on an electrostatic accelerator, Pelletron, working in an energy-recovery, or "recirculation", regime. A full-scale prototype of the cooler has been assembled and commissioned in a separate building. The main goal of the experiments with the prototype is to demonstrate a stable operation with a 3.5 MeV, 0.5 A DC electron beam while preserving a high beam quality in the cooling section. The paper describes the current status of the work and preliminary experimental results.

Fermilab electron cooling project: commissioning of the 5 MeV recirculation test set-up

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268), 2001

An important part of the Fermilab's Recycler Electron Cooling (REC) project [1] is a recirculation test which is performed using a 5-MV electrostatic accelerator, a Pelletron, with two tubes and a simplified beam line with one 180-degree bend. The main goal of the test is to demonstrate stable operation of a 4.4-MeV, 0.5-A DC electron beam. The paper describes the set-up and the early experimental results.

Status of the Fermilab electron cooling project

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2004

The first stage of the Fermilab Electron Cooling R&D program is now complete: technology necessary to generate hundreds of milliamps of electron beam current at MeV energies has been demonstrated. Conceptual design studies show that with an electron beam current of 200 mA and with a cooling section of 20 m electron cooling in the Fermilab Recycler ring can provide antiproton stacking rates suitable for the Tevatron upgrades beyond Run II luminosity goals. A prototype of such an electron cooling system is now being built at Fermilab as part of the continuing R&D program. This paper describes the electron cooling system design as well as the status of the Fermilab electron cooling R&D program.

Instrumentation for the Proposed Low Energy Rhic Electron Cooling Project*

There is a strong interest in running the Relativistic Heavy Ion Collider (RHIC) at low ion beam energies of 2.5-20GeV/nucleon; this is much lower than the typical operations with 100GeV/nucleon. The primary motivation for this effort is to explore the existence and location of the critical point on the QCD phase diagram. Electron cooling can increase the average integrated luminosity and increase the length of the stored lifetime. A cooling system is being designed that will provide a 10 – 50mA electron beam with adequate quality and an energy range of 0.9 – 5MeV. The cooling facility [1] planned in RHIC will include an SRF gun and booster cavity, and a beam transport to one ring to allow electron-ion co-propagation for ~ 12m, then a 180 degree U-turn electron transport so the same electron beam can similarly cool the other counter-rotating ion beam, then to a dump. The instrumentation systems that will be described include current transformers, BPMs, profile monitors, an emittance...

Electron-cooling scenarios at Fermilab

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2004

According to Run II upgrade plans, peak luminosity of the proton-antiproton beams in the Tevatron has to increase 7-8 times in coming years. This requires 5-6 times more antiprotons, which is supposed to be reached by means of electron cooling of accumulated pbars. A main scenario is to apply this in the Recycler (RR). However, there is an alternative, i.e to e-cool pbars in the accumulator, without using RR at all. Advantages and disadvantages of both scenarios are discussed. r

Beam Instrumentation for the Cosy Electron Cooler

2012

The report deals with beam instrumentation of the electron cooler for COSY storage ring. The electron cooler is an electrostatic accelerator designed for beam energy up to 2 MeV and electron current up to 3 A in energy recovery mode. The electron beam is immersed in longitudinal magnetic field so the electron motion is strongly magnetized. The control electrode in the electron gun is composed of four electrically isolated sectors. Applying AC voltage to one sector allows tracing of motion of that particular part of the beam. The electron beam shape is registered with the combination of 4-sector electron gun and the BPMs. This method allows observing both dipole and quadruple (galloping) modes of electron beam oscillation. Compass probe for measuring and tuning the direction of magnetic field in the cooling section is described. A monitor based on a few small Faraday cups for measuring the electron beam profiles is presented.

Attainment of a high-quality electron beam for Fermilab's 4.3 MeV cooler

The recent demonstration of electron cooling of antiprotons in the Recycler ring required a stable 4.3 MeV electron beam with a DC current of hundreds of mA and an angular spread in the cooling section of a fraction of a mrad. This paper describes the achieved parameters of the Fermilab cooler's electron beam and details of operation.

Commissioning of the Fermilab electron cooler prototype beam line

2003

A prototype of a 4.3-MeV electron cooling system is being assembled at Fermilab as part of the ongoing R&D program in high energy electron cooling. This electron cooler prototype will not demonstrate the actual cooling but it will allow determining if the electron beam properties are suitable for antiproton beam cooling. An electron beam is accelerated by a 5-MV Pelletron (Van de Graaff type) accelerator and transported to a prototype cooling section. The cooling will take place in a 20-m long solenoid flanked on both sides by a delivery and return beam-line -a total of 60 meters of transport channel.

Attainment of an MeV-range, DC electron beam for the Fermilab cooler

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2004

To prepare a beam generation device for Fermilab's future Recycler Electron Cooling system, an experimental set-up with a simplified beam line has been commissioned at Fermilab. Stable operation was achieved at an electron energy of 3.5 MeV and a DC beam current of up to 0.5 A. The main reason for interruptions of the operation was found to be microsecond long bursts of the cathode current. While the frequency of the interruptions is determined primarily by a flow of secondary ions, the resulting reduction in the duty factor depends on the beam optics, the protection systems, and the tube electric field strength. r