Status of the 2 MeV Electron Cooler for COSY- Juelich / HESR€¦ · Essential for experiment with...

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Status of the 2 MeV Electron Cooler for COSY- Juelich / HESR

COOL11 Alushta, Ukraine 12th of September 2011

Jürgen Dietrich

Forschungszentrum Jülich, Institut für Kernphysik

Cool11, Alushta, Ukraine Jürgen Dietrich Institut für Kernphysik (IKP-4) Folie 2

Outline

Introduction

Motivation

Special Features of High Energy Electron Cooling

Technical development

Progress at BINP Novosibirsk

Progress at FZJ Juelich - COSY

Outlook


Higher Luminosity at COSY with cooled beams

Limits of the COSY stochastic cooling systemLuminosity < 1031 cm-2 s-1

Requests for future COSY experimentsLuminosity > 1032 cm-2 s-1

Combination of electron and stochastic cooling at the same high beam energy

FZJ IKP responsible for the High Energy Storage Ring HESR in the FAIR project

Challenge: Development of the high energy electron cooler for HESR/FAIR (4.5 MeV - 8 MeV)

Motivation


Combination of Electron and Stochastic Cooling

Electron cooling: core

Stochastic cooling: tails


Artist’s View and

High Energy Storage RingHESR

HESRCircumference 574 mMomentum (energy) range 1.5 to 15 GeV/c (0.8-14.1 GeV)Injection of (anti-) protons (from RESR) at 3.8 GeV/cAcceleration rate 0.1 (GeV/c)/s

Electron cooling up to 8.9 GeV/c (4.5 MeVelectron cooler)Stochastic cooling above 3.8 GeV/c


Special Features of High Energy Electron Cooling

Cooling time: 3γτ ∝long27

γτ ∝trans

Decreasing of “corrugation, waviness” of force line of the magnetic field is essential for obtaining maximum of friction force

⎟⎟⎠

⎞⎜⎜⎝

⎛+

++

−=⋅=Δmin

max

322

4

1ln)(

4ρρ

ρττ

Leffe

e

VVm

VneFp

rrr

2222eBEeff VVVV ++= ×ΔΘ

200013.8

10008.0

1001.9

E, keV30 30E Eγ β γ β

Essential for experiment with internal target

“Waviness” of magnetic force lineΔ 2BΔ 2V c BγβΔΘ =

Technical Challenge:

High Voltage (Ee >0.5 MeV, Ie <3 A, confinment in magnetic field)

Magnetic field quality, straightness in cooling section < 10-5


Magnetised or not Magnetised Electron Cooling

Power for the coils along the acceleration and deceleration columns:

Rotating shafts (Fermilab)

Gas turbine ( idea of BINP)

Cascade transformer (present solution)

The 4.3 MeV electron cooler at the RECYCLER ring (FNAL) achieves cooling time of about 1 h.The new cooler for COSY should provide a few orders of magnitude more powerful longitudinal and transverse cooling that requires new technical solutions.

The basic idea of the new COSY cooler is to use high magnetic field along the orbitof the electron beam from the electron gun to the electron collector.


Important and practical question: What is the optimal magnetic field value in the cooling section for 2 MeVcooler ?Stronger magnetic field improves the cooling. From practical point of view this figure supported choice of 2 kG magnetic field.

Horizontal emittance versus time for different magnetic fields at cooling section.

Magnetic Field in the Cooling Section

0 10 20 30 400,01

0,1

1em

itanc

e pi

*mm

*mra

d

time (s)

magnet fieldB Gauss

500 1000 2000 4000

8 s 23 s

(magnetized cooling)

Poster L. Mao, FZJ

Simulation of high-energy electron cooling

at COSY with BETACOOL code.


---

Телефон/Phone: (3832) 39-44-61. E-mail: [email protected]. Факс/Fax: (3832) 30-71-63

First report

ELECTRON COOLING FOR COSY

(FEASIBILITY STUDY OF 2 MEV ELECTRON COOLING FOR COSY)

Novosibirsk, 2005

СИБИРСКОЕ ОТДЕЛЕНИЕ РОССИЙСКОЙ АКАДЕМИИ НАУК

Институт ядерной физики им. Г.И. Будкера

630090 Новосибирск, Россия

SIBERIAN BRANCH OF RUSSIAN ACADEMY OF SCIENCE

Budker Institute of Nuclear Physics 63090 Novosibirsk, Russia

Interims (First) Report, Novosibirsk, 2005

Technical development


Technical Design – Layout BINPBasic Parameters and Requirements

Final Version from January 2010

Energy Range: 0.025 ... 2 MeVHigh Voltage Stability < 10-4

Electron Current 0.1 ... 3 AElectron Beam Diameter 10 ... 30 mmCooling section length 2.694 mToroid Radius 1.00 mVariable magnetic field(cooling section solenoid) 0.5 ... 2 kGVacuum at Cooler 10-9 ... 10-10 mbar

Available Overall Length 6.390 mMaximum Height 5.7 mCOSY beam Axis above Ground 1.8 m

5640

mm


High Voltage Tank


deformations in mm

Mechanical Stresses and Deformationsof the High Voltage Tank

finite element model ,12 bar

J. Wolters ZAT FZ Jülich


∅1000

540

480

∅350

1 section2 section3 section

spark-gapsystem

oil in

oil out

High Frequency Cascaded Resonant Transformer20 kHz, 40 kW

High Voltage Section

Transformer Columnamorphous ferrite foil core, cylinder filled with transformer oil for isolation,high voltage, input-output ceramic feedthrough for connection of HV sections

Present Solution


Magnetic Field in Cooling Section

rotary motion feedthroughto vacuum

vacuum chamber of the cooler section with rail for magnetic probe

(1) magnetic sensor, (2) conductors of the compensating circuits, (3) beam splitter,(4) photo-detector, (I-IV) photo-detector quadrants, and (X, Y) output current amplifiers.

Laser

Poster M. Bryzgunov, BINP

System for measurement of magnetic field

line straightness in solenoid of electron cooler

for COSY


Cooling Section

Progress at Budker Institut Novosibirsk

Talk, V. Reva, BINP, 15th of September

The first commission results the high voltage

magnetized cooler for COSY


Test Bench for Commissioning with Electron Beam


Magnet System Components and HV Vessel


Cascade Generator Test Bench


The magnetic field component along the ion beam orbit in cooler,(power : Jsol=175A, Jtor=Jdip=500A, Jbend=200A)

Magnetic Field Measurements – Hall Probes

400− 200− 0 200 4002− 103×

1− 103×

0

1 103×

2 103×

B_longitudinalB_verticalB_horizontal

Magnetic field of 2MeV cooler

s [cm]

Mag

netic

fiel

d [G

s]

Cooling Solenoid Jsol

Dipol Corrector Jdip

Toroid Jtor+ Bend Jbend

Poster A. Panasyuk, BINP

Magnetic system of electron cooler for COSY


Electron Gun

41

+20 kV

2 3

HV ground

cathode

25 V25 V-3

/+4

kV

0/+1

0 kV

Gun

Gun control electrode is assembled of 4 separate sections.It allows measurements of the beam envelope along the transport section.

p p

Profile of the electron beam at different voltageson the control electrode (calculated)

Poster A. Bubley, BINP

Electron gun with variable beam profil for COSY cooler


New Electron Collector Design with a Wien filter

5 4 6 7 8

HV ground

+20 kV

+10 kV

+20 kV

+30 kV

-2/+4 kV

+2/+5 kV

Wie

n Fi

lter

Colle

ctor

Wien filter, E x B field, 2.85 kV/cm, 35 GMinimisation of the number of reflected electronsefficiency < 10-5.

Collector up to 15 kW

Test Bench BINP

Collector

Electron GunPoster M. Bryzgunov, BINP

Electron collector for 2 MeV electron cooler for COSY


Progress at COSY-Juelich

Making Space Available in 2010 (shutdown 21.6. -23.7.2010)

Closed Orbit Correction at 2 MeV cooler

Profile Monitor IPM and SPMElectron Beam Profile Measurement in the Cooling Section with Thomson Scattering (HIM)

Development of Beam Diagnostics for Electron Cooling Optimisation

Ordering (in 2010): HV pressure vessel (10 bar SF6)oil pressure vesselSF6 gas systemvacuum componentspower supplies (magnetic system)water hosesoil pumpsheat exchanger

Building application (Bauantrag an die Stadt Jülich, radiation shielding)

Radiation safety (Nachtrag-Verfahren zu COSY-Strahlenschutz-Genehmigung BS2/92)


Plan of COSY Cooler Location with Shielding Elements

beam


6,39 m

60 cm

Place for the new 2 MeV cooler

Main problem is matching with existence equipment

Making Space Available in 2010 (shutdown 21.6. -23.7.2010)


New water cooling pipes for the COSY ring

Removing of excisting components from TP2’ (BCT, cavity, WCM)

Changing cabling in the COSY tunnel

Making Space Available in 2010

Changing position of racks outside the tunnel


Radiation Shielding


Support of Quadrupoles


Closed Orbit Three Bump Local Correction –Horizontal Plane

Table : The steerers’ parameters for closed orbit correction (1kG)

-4.126 mrad-4.412 mradSteerer in QT8

32.586 mrad (-24.4A)-23.4ADV2 in cooler

-31.0 mrad (500A)500AToroid 2 and dipole 2

31.0 mrad (500A)500AToroid 1 and dipole 1

-37.518 mrad (-11.5A)-10.6 ADV1 in cooler

7.559 mrad7.692 mradSteerer in QT1

WinagileMathCAD

QT1 QT8

Dipol Corrector

DV1

DV2

m

m

Solenoid

Poster L. Mao, FZJ

Closed orbit correction in

2 MeV electron cooler section at COSY

Additional Steerer in the Quadrupoles


Place for the New 2 MeV Cooler Today


Ionisation Profile Monitor IPM

C. Böhme, J. Dietrich, V. Kamerdzhiev, P. Forck, T. Giacomini, D. LiakinBeam Test of the FAIR IPM Prototype in COSYProc. of the 9th European Workshop on Beam Diagnostics and Instrumentationfor Particle Accelerators, DIPAC2009, Basel, Switzerland, May 24-27, 2009.

Beam-direction

DN250CF

UV Lamp, 200nmfor MCP calibration

CCD Camera

MCP + PhosphoModuleP47 (400nm, 100ns decay)

Vertical IPMHorizontal IPM

Vacuum tanklength = 0.6 m

Beam Diagnostic Developments


Electron Cooling at Injection EnergyProton Beam Profiles (Restgas Ionisation Monitor)

BCT beam current

1σ beam widthwhite-horizontalred- vertical

beam positionwhite-horizontalred- vertical

beam profilewhite-horizontalred- verticalblue – Gauss fit

80 mm


Scintillation Profile Monitor SPM

Light from the ion beam (1) is focused with a lens (2) on a multichannel PM (3).

Horizontal beam profile with 1.5·1010 protons , 2.6 GeV/c. Temporary pressure bump at the SPMlocation amounted to 4·10-8 mbar.

10 s

Pre

ssur

em

bar

Time

Piezo-electricleak valve


Schematic Measurement Setup

Proposed Electron Beam Profile Measurement in theCooling Section with Thomson ScatteringT. Weilbach, HIM, Mainz

Poster T. Weilbach, HIM, Mainz

Optical electron beam diagnostics for relativistic electron cooling devices


---

Телефон/Phone: (3832) 39-44-61. E-mail: [email protected]. Факс/Fax: (3832) 30-71-63

First report

ELECTRON COOLING FOR COSY

(FEASIBILITY STUDY OF 2 MEV ELECTRON COOLING FOR COSY)

Novosibirsk, 2005






Interims (First) Report, Novosibirsk May 2005

Allocation of Money March 2009ECONOMIC STIMULUS PLAN I in Germany

First idea COSY 2 MV cooler and discussionBINP Novosibirsk, 2003

History

e- -Commissioning at BINP May 2011

Contract BINP-FZJ July 2009

Conceptual Design Report December 2009

Installation at COSY November/December 2011


OutlookLast Status at Budker Institut Novosibirsk


Thanks to our Thanks to our colleagues colleagues

from BINP Novosibirskfrom BINP Novosibirsk

V.V.Parkhomchuk, V.B.Reva, V.K. Gosteev, A.M. Kruchkov, A.A. Putmakov, V.A. Poluhin

M.I. Bryzgunov, A.D. Goncharov, D.N. Skorobogatov …..


Electron Cooling at COSY

Accumulation of low intensity beams

Electron energy:24.5 - 100 kV

Electron current: 0.2 - 3 A

eei vcv 00 == βrr

Introduction


0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.90

500

1000

1500

2000Elektronenkühlung vi = ve

Elektronenenrgie [MeV]

Prot

onen

ener

gie

[MeV

]

Ti x( )

0.1 0.3

x

0 1 2 3 4 5 6 7 8 9 10

5000

1 .104

1.5 .104

2 .104Elektronenkühlung vi = ve

Prot

onen

ener

gie

[MeV

]

Ti x( )

5 8

x

Proton Energy Versus Electron Energy for Cooling vi = ve

2

0

11−

⎟⎟⎠

⎞⎜⎜⎝

⎛+−=

ETkinβ

iecv βββ ===

ei kine

ikin T

EET ⋅=

0

0

HESR 15 GeV p

8 MeV e-

State of the art550 MeV p

300 keV e-

Future: High Energy Electron Cooling

FNAL 8 GeV p

4.3 MeV e-

COSY (final energy 2.9 GeV)

3.7 GeV p

2 MeV e-

COSY180 MeV p

100 keV e-

_

Electron Energy [MeV]

Electron Energy [MeV]

Prot

on E

nerg

y [M

eV]

Prot

on E

nerg

y [M

eV]

_


In operation25 - 350 kV at CERN, GSI, IMP Lanzhou, FZJ …

In operation (commissioned September 2005)

4.3 MV at FNAL (DC, non-magnetized) Longitudinal cooling time > 1h

In future

2 MV2 MV for COSY (DC, magnetized), in for COSY (DC, magnetized), in realisationrealisation

8 MV (?)8 MV (?) for HESR (DC, magnetized)for HESR (DC, magnetized)

54 MV for RHIC (AC) ?54 MV for RHIC (AC) ?

Electron Cooler - Status


0.2 0.15 0.1 0.05 0 0.05 0.1 0.15 0.20.01

0.1

1

10

100

1 .103

1 .104

1 .105

initial profileafter 10 sec at target 1E15/cm^2+3A cooling

x profile

x cm

dN/d

x

Ck 1,

Ck 10,

Dk 10,

Ck 0,

0 2 4 6 8 100

0.05

0.1

0.15

no coolingcooling 3 A

normalized emittance mm*mrad*pi

cooling time (s)

emitt

ance

pi*

mm

*mra

d

Ck 2,

Dk 3,

Ck 0,

no cooling

no cooling +target

How will act cooler on proton beam in transverse direction with target ?(proton beam: 2 GeV, 2·1010, electron cooler: re = 5 mm, Bc= 2 kG, Ie = 3 A)


How will cooler act on momentum spread of proton beam with target?

0 2 4 6 8 101 .10 5

5 .10 6

0

5 .10 6<dp> momentum spread

cooling time (s)

<dp>

Ck 5,

Dk 5,

Ck 0,

5 .10 4 4 .10 4 3 .10 4 2 .10 4 1 .10 4 0 1 .10 4 2 .10 4 3 .10 41

10

100

1 .103

1 .104

initial distributionno cooling but target 1E15 1/cm^2+cooling 3A

momentum spread

dp/p

dN/d

p

Ck 1,

Ck 10,

Dk 10,

Ck 0,

no cooling

no cooling


Inside View

Zus. Abgänge

(Wasserversorgung E-Kühler)

Sprossenwand für

(Elektr. Leitungen)

Sprossenwand für

(Elektr. Leitungen)

Strahlrichtung


Helmholtz Russia Joint Research Group

2009 -2012

450 K€

--- Т ф /Ph (3832) 39 44 61 E il V V P kh h k@i k Ф /F (3832) 30 71 63






BINP Novosibirsk JINR Dubna

TU DortmundFZJ Jülich

HRJRG-106Development of a High Energy Electron Cooler for Hadron Physics Experiments at COSY and HESR

Status of the 2 MeV Electron Cooler for COSY- Juelich / HESR€¦ · Essential for experiment with...

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