COOL2015 - List of Keywords (vacuum)

Paper	Title	Other Keywords	Page
MOXAUD02	Experimental Observation of Longitudinal Electron Cooling of DC and Bunched Proton Beam at 2425 MeV/c at COSY	electron, proton, simulation, experiment	10
	V.B. Reva, M.I. Bryzgunov, V.V. Parkhomchuk BINP SB RAS, Novosibirsk, Russia V. Kamerdzhiev, T. Katayama, R. Stassen, H. Stockhorst FZJ, Jülich, Germany
	The 2 MeV electron cooling system for COSY-Julich started operation in 2013 years. The cooling process was observed in the wide energy range of the electron beam from 100 keV to 908 keV. Vertical, horizontal and longitudinal cooling was tested at bunched and continuous beams. The cooler was operated with electron current up to 0.9 A. This report deals with the description of the experimental observation of longitudinal electron cooling of DC and bunched proton beam at 2425 MeV/c at COSY.
	Slides MOXAUD02 [10.860 MB]
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MOPF09	Signals from a Beam Performing Betatron Oscillations Using an Electrostatic Electrode Model with Rectangular Boundaries	betatron, pick-up, storage-ring, kicker	51
	F. Nolden GSI, Darmstadt, Germany J.X. Wu IMP/CAS, Lanzhou, People's Republic of China
	We present a novel electrostatic electrode model with rectangular boundaries. The fields are calculated using a conformal mapping. These fields are used to calculate the signal due to a relativistic beam. The response at harmonics of the revolution frequency and at the corresponding horizontal and vertical sidebands is given. The underlying nonlinear formalism is due to Bisognano and Leeman. The electrode geometry of the new stochastic cooling system at the CSRe ring at the IMP in Lanzhou is taken to derive the responses in the sum mode, the horizontal difference mode, and the vertical difference mode.
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TUPF08	High Efficiency Electron Collector for the High Voltage Electron Cooling System of COSY	electron, high-voltage, gun, experiment	112
	M.I. Bryzgunov, A.V. Bubley, V.A. Chekavinskiy, I.A. Gusev, A.V. Ivanov, M.N. Kondaurov, V.M. Panasyuk, V.V. Parkhomchuk, D.N. Pureskin, A.A. Putmakov, V.B. Reva, D.V. Senkov, D.N. Skorobogatov BINP SB RAS, Novosibirsk, Russia V.B. Reva NSU, Novosibirsk, Russia
	A high efficiency electron collector for the COSY high voltage electron cooling system was developed. The main feature of the collector is usage of special insertion (Wien filter) before the main collector, which deflects secondary electron flux to special secondary collector, preventing them fly to the electrostatic tube. In first tests of the collector in COSY cooler efficiency of recuperation better then 10^-5 was reached. Before assembling of the cooler in Jülich upgrades of the collector and electron gun were made. After the upgrade efficiency better then 10-6 was reached. Design and testing results of the collector are described.
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THWCR04	RF Technologies for Ionization Cooling Channels	cavity, electron, plasma, ion	145
	B.T. Freemire, Y. Torun IIT, Chicago, Illinois, USA D.L. Bowring, A. Moretti, A.V. Tollestrup, K. Yonehara Fermilab, Batavia, Illinois, USA A.V. Kochemirovskiy University of Chicago, Chicago, Illinois, USA D. Stratakis BNL, Upton, Long Island, New York, USA
	Funding: Fermilab Research Alliance, LLC under Contract No. DE-AC02-07CH11359 Ionization cooling is the preferred method of cooling a muon beam for the purposes of a bright muon source. This process works by sending a muon beam through an absorbing material and replacing the lost longitudinal momentum with radio frequency (RF) cavities. To maximize the effect of cooling, a small optical beta function is required at the locations of the absorbers. Strong focusing is therefore required, and as a result normal conducting RF cavities must operate in external magnetic fields on the order of 10 Tesla. Vacuum and high pressure gas filled RF test cells have been studied at the MuCool Test Area at Fermilab. Methods for mitigating breakdown in both test cells, as well as the effect of plasma loading in the gas filled test cell have been investigated. The results of these tests, as well as the current status of the two leading muon cooling channel designs, will be presented.
	Slides THWCR04 [46.592 MB]
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FRXAUD02	Lepta - the Facility for Fundamental and Applied Research	positron, electron, cryogenics, resonance	179
	A.G. Kobets, E.V. Ahmanova, P. Horodek, I.N. Meshkov, O. Orlov, A.A. Sidorin JINR, Dubna, Moscow Region, Russia M.K. Eseev NAFU, Arkhangelsk, Russia
	The project of the Low Energy Positron Toroidal Accumulator (LEPTA) is under development at JINR. The LEPTA facility is a small positron storage ring equipped with the electron cooling system. The project positron energy is of 2 ' 10 keV. The main goal of the facility is to generate an intense flux of positronium atoms ' the bound state of electron and positron. Storage ring of LEPTA facility was commissioned in September 2004 and is under development up to now. The positron injector has been constructed in 2005 / 2010, and beam transfer channel ' in 2011. By the end of August 2011 the experiments on injection into the ring of electrons and positrons stored in the trap were carried out. In 2012 - 2015, the LEPTA trap optimization and new experiments on accumulation of electrons and positrons in the trap has been performed. Furthermore new cooler for positrons source has been designed and manufactured, its assembling is in progress. The recent results are presented here.
	Slides FRXAUD02 [4.124 MB]
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Paper

Title

Other Keywords

Page

MOXAUD02

Experimental Observation of Longitudinal Electron Cooling of DC and Bunched Proton Beam at 2425 MeV/c at COSY

electron, proton, simulation, experiment

10

V.B. Reva, M.I. Bryzgunov, V.V. Parkhomchuk
BINP SB RAS, Novosibirsk, Russia
V. Kamerdzhiev, T. Katayama, R. Stassen, H. Stockhorst
FZJ, Jülich, Germany

The 2 MeV electron cooling system for COSY-Julich started operation in 2013 years. The cooling process was observed in the wide energy range of the electron beam from 100 keV to 908 keV. Vertical, horizontal and longitudinal cooling was tested at bunched and continuous beams. The cooler was operated with electron current up to 0.9 A. This report deals with the description of the experimental observation of longitudinal electron cooling of DC and bunched proton beam at 2425 MeV/c at COSY.

Slides MOXAUD02 [10.860 MB]

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MOPF09

Signals from a Beam Performing Betatron Oscillations Using an Electrostatic Electrode Model with Rectangular Boundaries

betatron, pick-up, storage-ring, kicker

51

F. Nolden
GSI, Darmstadt, Germany
J.X. Wu
IMP/CAS, Lanzhou, People's Republic of China

We present a novel electrostatic electrode model with rectangular boundaries. The fields are calculated using a conformal mapping. These fields are used to calculate the signal due to a relativistic beam. The response at harmonics of the revolution frequency and at the corresponding horizontal and vertical sidebands is given. The underlying nonlinear formalism is due to Bisognano and Leeman. The electrode geometry of the new stochastic cooling system at the CSRe ring at the IMP in Lanzhou is taken to derive the responses in the sum mode, the horizontal difference mode, and the vertical difference mode.

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPF08

High Efficiency Electron Collector for the High Voltage Electron Cooling System of COSY

electron, high-voltage, gun, experiment

112

M.I. Bryzgunov, A.V. Bubley, V.A. Chekavinskiy, I.A. Gusev, A.V. Ivanov, M.N. Kondaurov, V.M. Panasyuk, V.V. Parkhomchuk, D.N. Pureskin, A.A. Putmakov, V.B. Reva, D.V. Senkov, D.N. Skorobogatov
BINP SB RAS, Novosibirsk, Russia
V.B. Reva
NSU, Novosibirsk, Russia

A high efficiency electron collector for the COSY high voltage electron cooling system was developed. The main feature of the collector is usage of special insertion (Wien filter) before the main collector, which deflects secondary electron flux to special secondary collector, preventing them fly to the electrostatic tube. In first tests of the collector in COSY cooler efficiency of recuperation better then 10^-5 was reached. Before assembling of the cooler in Jülich upgrades of the collector and electron gun were made. After the upgrade efficiency better then 10-6 was reached. Design and testing results of the collector are described.

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THWCR04

RF Technologies for Ionization Cooling Channels

cavity, electron, plasma, ion

145

B.T. Freemire, Y. Torun
IIT, Chicago, Illinois, USA
D.L. Bowring, A. Moretti, A.V. Tollestrup, K. Yonehara
Fermilab, Batavia, Illinois, USA
A.V. Kochemirovskiy
University of Chicago, Chicago, Illinois, USA
D. Stratakis
BNL, Upton, Long Island, New York, USA

Funding: Fermilab Research Alliance, LLC under Contract No. DE-AC02-07CH11359
Ionization cooling is the preferred method of cooling a muon beam for the purposes of a bright muon source. This process works by sending a muon beam through an absorbing material and replacing the lost longitudinal momentum with radio frequency (RF) cavities. To maximize the effect of cooling, a small optical beta function is required at the locations of the absorbers. Strong focusing is therefore required, and as a result normal conducting RF cavities must operate in external magnetic fields on the order of 10 Tesla. Vacuum and high pressure gas filled RF test cells have been studied at the MuCool Test Area at Fermilab. Methods for mitigating breakdown in both test cells, as well as the effect of plasma loading in the gas filled test cell have been investigated. The results of these tests, as well as the current status of the two leading muon cooling channel designs, will be presented.

Slides THWCR04 [46.592 MB]

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FRXAUD02

Lepta - the Facility for Fundamental and Applied Research

positron, electron, cryogenics, resonance

179

A.G. Kobets, E.V. Ahmanova, P. Horodek, I.N. Meshkov, O. Orlov, A.A. Sidorin
JINR, Dubna, Moscow Region, Russia
M.K. Eseev
NAFU, Arkhangelsk, Russia

The project of the Low Energy Positron Toroidal Accumulator (LEPTA) is under development at JINR. The LEPTA facility is a small positron storage ring equipped with the electron cooling system. The project positron energy is of 2 ' 10 keV. The main goal of the facility is to generate an intense flux of positronium atoms ' the bound state of electron and positron. Storage ring of LEPTA facility was commissioned in September 2004 and is under development up to now. The positron injector has been constructed in 2005 / 2010, and beam transfer channel ' in 2011. By the end of August 2011 the experiments on injection into the ring of electrons and positrons stored in the trap were carried out. In 2012 - 2015, the LEPTA trap optimization and new experiments on accumulation of electrons and positrons in the trap has been performed. Furthermore new cooler for positrons source has been designed and manufactured, its assembling is in progress. The recent results are presented here.

Slides FRXAUD02 [4.124 MB]

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)