COOL2013 - List of Authors (Katayama, T.)

Paper

Title

Page

Stochastic Cooling of a Polarized Proton Beam at COSY

44

H. Stockhorst, R. Gebel, V. Kamerdzhiev, A. Lehrach, B. Lorentz, R. Maier, D. Prasuhn, R. Stassen
FZJ, Jülich, Germany
T. Katayama
GSI, Darmstadt, Germany

Stochastic cooling can increase the spin coherence time in storage ring experiments dedicated to the search of electric dipole moments of protons or deuterons. Since radial magnetic fields may lead to depolarizing spin resonances a first test with a vertical polarized beam at COSY subject to vertical stochastic cooling has been investigated. The polarization was measured at the beginning and the end of flat top momentum with the result that no polarization loss could be observed within five minutes. The spin motion under the influence of stochastic cooling was also studied with the Thomas-BMT equation including the estimated electromagnetic fields for a quarter wave length kicker structure. It is found that the resonance strength in the cooling bandwidth of 1-2 GHz is much smaller than the typical imperfection or intrinsic resonance strengths. The resonance condition of the spin rotation is not fulfilled as the harmonics of cooling RF kicker fields are not in phase with the spin rotation angle per turn. In conclusion it is expected that stochastic cooling will not lead to depolarization even when stochastic cooling is applied for a longer time as in the present experiment.

Slides TUAM1HA02 [2.324 MB]

TUAM1HA04

Simulation Study of Stochastic Cooling of Heavy Ion Beam at the Collector Ring of FAIR

52

T. Katayama, C. Dimopoulou, A. Dolinskyy, F. Nolden, M. Steck
GSI, Darmstadt, Germany

In the modularized start version of the FAIR project, the New Experimental Storage Ring is not included and therefore the task of the stochastic cooling system at the Collector Ring (CR) has been until now focused on the 3 GeV anti-proton beam. On the other hand, recently the SPARC collaboration has proposed to start the high energy atomic physics experiments in the HESR ring with stable ions, typically a ²³⁸U⁹²⁺ beam, implementing the internal target. Furthermore the future possibility of the nuclear physics experiments with rare isotope beams, typically ¹³²Sn⁵⁰⁺ beam, in the HESR is envisaged. In the present report, the beam dynamics, mainly the longitudinal motion from the front-end (superconducting fragment separator) to the back-end (fast extraction from the CR) are described emphasizing the process of stochastic cooling of the rare isotope beam.

Slides TUAM1HA04 [2.504 MB]

TUPM1HA01

Study for Stochastic Cooling at Nuclotron, JINR

73

N. Shurkhno, A.O. Sidorin, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia
T. Katayama
GSI, Darmstadt, Germany
R. Stassen
FZJ, Jülich, Germany

The experiment on stochastic cooling at Nuclotron, initiated two years ago as a test bench for NICA collider, is progressing well. New scheme of cooling system, which includes ring-slot couplers as pick-up and kicker (designed at FZJ), optical notch-filter and full remote-controlled automation of measurements and adjustments, was set in operation in autumn 2012. This report presents results of beam cooling modeling, experimental measurements of the optical notch-filter and channel elements performed in 2011-2012, and also first results of the beam cooling achieved at Nuclotron in March 2013.

Slides TUPM1HA01 [1.817 MB]

WEPPO02

Stacking Modes with Barrier Buckets Method in NICA Collider

97

A.V. Smirnov, I.N. Meshkov, A.O. Sidorin, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia
A.V. Eliseev
JINR/VBLHEP, Dubna, Moscow region, Russia
T. Katayama
GSI, Darmstadt, Germany

A new accelerator complex NICA is under construction at JINR now. The main goal of this project is to reach a very high luminosity of 10²⁷ [cm^-2 c^-1] in the colliding experiments with gold ions in the energy range of 1 – 4.5 GeV/u. Both electron and stochastic cooling methods will be used to provide the necessary beam parameters. The beam stacking in the longitudinal phase space with stationary and moving barrier buckets in NICA Collider under action of cooling methods or without cooling are presented in this report.

THAM2HA01

Beam Accumulation and Bunching with Cooling

170

T. Katayama, M. Steck
GSI, Darmstadt, Germany
T. Kikuchi
Nagaoka University of Technology, Nagaoka, Niigata, Japan
I.N. Meshkov
JINR, Dubna, Moscow Region, Russia
H. Stockhorst
FZJ, Jülich, Germany

The accumulation of anti-proton beam in the storage ring was performed at CERN and FNAL with use of a stochastic stacking system. In the original version of the FAIR such a concept was envisaged at the accumulator ring named RESR. However in the modularized start version of FAIR, the RESR was postponed and the new concept of anti-proton accumulation in the High Energy Storage Ring (HESR) was strongly demanded. The barrier bucket system with stochastic cooling was found with simulation work to have enough capabilities to accumulate the pre-cooled 3 GeV anti-proton beam in the HESR. The Proof Of Principle (POP) experiment was performed at the GSI storage ring ESR with the use of Ar and Xe ion beam employing both stochastic and electron cooling. The experimental results were well in agreement with the prediction of the simulation study. The concept of BB accumulation could be applied to the planned Collider of the NICA project at JINR. In the present paper the concept of BB accumulation and the short bunch formation including the space charge effects are presented as well as the analysis of POP experiment.

Slides THAM2HA01 [8.446 MB]

FRAM2HA03

Recollection of Dieter

T. Katayama
GSI, Darmstadt, Germany
A. Noda
NIRS, Chiba-shi, Japan
N. Tokuda
KEK, Ibaraki, Japan

We have collaborated with Dieter for more than 30 years. First TK and AN met with Dieter at the Heavy Ion Fusion Workshop in 1979 at Berkeley. At the beginning of 1980s the small ion storage ring TARN was constructed at Tokyo where we performed RF stacking and stochastic cooling of ion beams. In 1986 Dieter invited NT to CERN to join the low energy stochastic cooling work at the LEAR. TK also stayed at CERN as a visiting scientist at LEAR for half year in 1986. Through these collaboration works, the communication, officially and personally, with Dieter was strengthened. He stayed at RIKEN as an Eminent Scientist for several months in 2002 when he worked with TK on the crystallized beam and educated young students at the Beam Physics and Engineering Laboratory of RIKEN. Dieter advised and worked with AN on the Kyoto S-LSR on the laser cooling. From 2004 to 2011, TK worked together with Dieter on the GSI/FAIR storage ring projects mainly on the stochastic cooling and stacking of Pbar and Rare Isotope Beam. All memories of Dieter recollect us his warm, human and strict character in his life. Additional but important remark: he was a good teacher of skiing for TK and NT at Zermatt.

Slides FRAM2HA03 [7.144 MB]

Paper	Title	Page
TUAM1HA02	Stochastic Cooling of a Polarized Proton Beam at COSY	44
	H. Stockhorst, R. Gebel, V. Kamerdzhiev, A. Lehrach, B. Lorentz, R. Maier, D. Prasuhn, R. Stassen FZJ, Jülich, Germany T. Katayama GSI, Darmstadt, Germany
	Stochastic cooling can increase the spin coherence time in storage ring experiments dedicated to the search of electric dipole moments of protons or deuterons. Since radial magnetic fields may lead to depolarizing spin resonances a first test with a vertical polarized beam at COSY subject to vertical stochastic cooling has been investigated. The polarization was measured at the beginning and the end of flat top momentum with the result that no polarization loss could be observed within five minutes. The spin motion under the influence of stochastic cooling was also studied with the Thomas-BMT equation including the estimated electromagnetic fields for a quarter wave length kicker structure. It is found that the resonance strength in the cooling bandwidth of 1-2 GHz is much smaller than the typical imperfection or intrinsic resonance strengths. The resonance condition of the spin rotation is not fulfilled as the harmonics of cooling RF kicker fields are not in phase with the spin rotation angle per turn. In conclusion it is expected that stochastic cooling will not lead to depolarization even when stochastic cooling is applied for a longer time as in the present experiment.
	Slides TUAM1HA02 [2.324 MB]

TUAM1HA04	Simulation Study of Stochastic Cooling of Heavy Ion Beam at the Collector Ring of FAIR	52
	T. Katayama, C. Dimopoulou, A. Dolinskyy, F. Nolden, M. Steck GSI, Darmstadt, Germany
	In the modularized start version of the FAIR project, the New Experimental Storage Ring is not included and therefore the task of the stochastic cooling system at the Collector Ring (CR) has been until now focused on the 3 GeV anti-proton beam. On the other hand, recently the SPARC collaboration has proposed to start the high energy atomic physics experiments in the HESR ring with stable ions, typically a ²³⁸U⁹²⁺ beam, implementing the internal target. Furthermore the future possibility of the nuclear physics experiments with rare isotope beams, typically ¹³²Sn⁵⁰⁺ beam, in the HESR is envisaged. In the present report, the beam dynamics, mainly the longitudinal motion from the front-end (superconducting fragment separator) to the back-end (fast extraction from the CR) are described emphasizing the process of stochastic cooling of the rare isotope beam.
	Slides TUAM1HA04 [2.504 MB]

TUPM1HA01	Study for Stochastic Cooling at Nuclotron, JINR	73
	N. Shurkhno, A.O. Sidorin, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia T. Katayama GSI, Darmstadt, Germany R. Stassen FZJ, Jülich, Germany
	The experiment on stochastic cooling at Nuclotron, initiated two years ago as a test bench for NICA collider, is progressing well. New scheme of cooling system, which includes ring-slot couplers as pick-up and kicker (designed at FZJ), optical notch-filter and full remote-controlled automation of measurements and adjustments, was set in operation in autumn 2012. This report presents results of beam cooling modeling, experimental measurements of the optical notch-filter and channel elements performed in 2011-2012, and also first results of the beam cooling achieved at Nuclotron in March 2013.
	Slides TUPM1HA01 [1.817 MB]

WEPPO02	Stacking Modes with Barrier Buckets Method in NICA Collider	97
	A.V. Smirnov, I.N. Meshkov, A.O. Sidorin, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia A.V. Eliseev JINR/VBLHEP, Dubna, Moscow region, Russia T. Katayama GSI, Darmstadt, Germany
	A new accelerator complex NICA is under construction at JINR now. The main goal of this project is to reach a very high luminosity of 10²⁷ [cm^-2 c^-1] in the colliding experiments with gold ions in the energy range of 1 – 4.5 GeV/u. Both electron and stochastic cooling methods will be used to provide the necessary beam parameters. The beam stacking in the longitudinal phase space with stationary and moving barrier buckets in NICA Collider under action of cooling methods or without cooling are presented in this report.

THAM2HA01	Beam Accumulation and Bunching with Cooling	170
	T. Katayama, M. Steck GSI, Darmstadt, Germany T. Kikuchi Nagaoka University of Technology, Nagaoka, Niigata, Japan I.N. Meshkov JINR, Dubna, Moscow Region, Russia H. Stockhorst FZJ, Jülich, Germany
	The accumulation of anti-proton beam in the storage ring was performed at CERN and FNAL with use of a stochastic stacking system. In the original version of the FAIR such a concept was envisaged at the accumulator ring named RESR. However in the modularized start version of FAIR, the RESR was postponed and the new concept of anti-proton accumulation in the High Energy Storage Ring (HESR) was strongly demanded. The barrier bucket system with stochastic cooling was found with simulation work to have enough capabilities to accumulate the pre-cooled 3 GeV anti-proton beam in the HESR. The Proof Of Principle (POP) experiment was performed at the GSI storage ring ESR with the use of Ar and Xe ion beam employing both stochastic and electron cooling. The experimental results were well in agreement with the prediction of the simulation study. The concept of BB accumulation could be applied to the planned Collider of the NICA project at JINR. In the present paper the concept of BB accumulation and the short bunch formation including the space charge effects are presented as well as the analysis of POP experiment.
	Slides THAM2HA01 [8.446 MB]

FRAM2HA03	Recollection of Dieter
	T. Katayama GSI, Darmstadt, Germany A. Noda NIRS, Chiba-shi, Japan N. Tokuda KEK, Ibaraki, Japan
	We have collaborated with Dieter for more than 30 years. First TK and AN met with Dieter at the Heavy Ion Fusion Workshop in 1979 at Berkeley. At the beginning of 1980s the small ion storage ring TARN was constructed at Tokyo where we performed RF stacking and stochastic cooling of ion beams. In 1986 Dieter invited NT to CERN to join the low energy stochastic cooling work at the LEAR. TK also stayed at CERN as a visiting scientist at LEAR for half year in 1986. Through these collaboration works, the communication, officially and personally, with Dieter was strengthened. He stayed at RIKEN as an Eminent Scientist for several months in 2002 when he worked with TK on the crystallized beam and educated young students at the Beam Physics and Engineering Laboratory of RIKEN. Dieter advised and worked with AN on the Kyoto S-LSR on the laser cooling. From 2004 to 2011, TK worked together with Dieter on the GSI/FAIR storage ring projects mainly on the stochastic cooling and stacking of Pbar and Rare Isotope Beam. All memories of Dieter recollect us his warm, human and strict character in his life. Additional but important remark: he was a good teacher of skiing for TK and NT at Zermatt.
	Slides FRAM2HA03 [7.144 MB]