DESIR Progress Report

• DESIR hall details defined for civil construction: - compressed air, liquid nitrogen, cooling water, etc

• detailed layout of RFQ-HRS room in production building

• first transmission tests of RFQ

• RF system successful tested

• detailed optical study of HRS

• S3 – DESIR beam line is established

• work on safety at DESIR started

• DESIR web pages online (www.cenbg.in2p3.fr/desir)

EURORIB meeting, 10 June 2008

Spiraland

GANIL

S3

DESIR

Level -1

Level 0

15 m

Production building

Accelerator

NFS S

RI

SPIRAL2 layout

Production building

F. Varenne

Spiraland

GANIL

S3

DESIR

Level -1

Level 0

15 m

Connections to DESIR

12m

8m

HRS

RFQ

storage and maintenance

Legend:

Electronics

Quadrupole

Sextupole

Multipole

Dipole

RFQ and HRS cave

The High Intensity RFQ Cooler SHIRaC

Length = 70 cm

Radius = 3mm

Test bench at LPC-Caen (Oct 07/ Jan 08)

• Current tests are done with ionization source– Imax ~ 50 nA

SimulationFirst Part:• Code developments including RF fields, microscopic approach for

cooling, space charge

• Input beam : 133Cs+ beam • Emittance : 75π.mm.mrad• Energy : 20keV• Intensity : 1µA

• Cooling distance at 0.05mbar ~ 400mm• Output emittance < 1π.mm.mrad• Injection efficiency ~ 25 %

Acceptance ~ 35 π.mm.mrad

Second Part:• Two cooling sections with different r0-radius• 5 mm and 3 mm + 4mm junction• Same RF on the two sections• Better injection efficiency (~ 100%)

Acceptance ~ 75 π.mm.mrad• Same cooling effect• Same emittance • Better overall efficiency

RF breakdown (Jan 08/Mar 08)

• 2 electrodes face to face– RF amplitude– Helium pressure– Gap– Roughness

Wo

rkin

g p

ress

ure

DN160 Flange

Micrometric screw 2µm

Electrodes Ø7

Insulator

2 SHV

• No RF breakdown :– For Etching polishing under

3600Vpp and 15Pa

– For Ra 1.6 under 3400Vpp and 12.5Pa

Beam transmission (Jun 08)• Cooler in RF-only : 10 % for 23Na+ and 133Cs+

• Transmission vs RF voltage for 133Cs+ :

SHIRaC Modification (Sep 08)

• Additional pump Low pressure at injection and

extraction electrodes

• Gaz injection• Emittance measurement

more details on the poster of F. Duval

Mass resolution:M/M = 20000

3 x’s, 3 y’s, 3 ’s, 3 ’s, 1 mass, 1 energy

3 mm mrad, 50 keV

3 mm mrad, 50 keV

R = 22091

Initial and final beam envelopsFirst and fifth order mass separation for 1/20000 mass difference

0.2 mm shift of multipole: significant loss in mass resolution

more details on the poster of T. Kurtukian Nieto

DESIR layout17/04/08

Laserroom

(mezzanine)

DA

Qro

om

Meetingroom

(on top of DAQ)

Kitchen(on top of CR)

Co

ntro

lro

om

MLL trap

Collinea

r Las

er

spec

trosc

opy

-NM

R

RFQbun-cher

off-linesource1

off-linesource2

+

Decay

set

up

Paultrap

Beam from SPIRAL1

Beam from S3

Bea

m f

rom

P

rod

uct

ion

bu

ild

ing

General

purpose

ElectronicsDeskAccess5 m

Level -1

Level 0

TAS

Neutronditch

Lev

el -

1

Crane access to basement

Double M

OT

Gener

al

purpose

IS

Identification station with

tape

LN2Gas &

w

aste sto

rage

LUMIERE BESTIOL

S

up

ply

Electri-city

Wo

rk-sh

op

Gray Room 2

Gray Room 1

AssemblyRoom 3

ControlRacksInter-faces

HV

supplies

Crane access to basement

Stor- age 1

Assembly Room 2

Assembly Room 1

Stor- age 2

free

5 m

free

Neutronditch

DESIR Level -1

Limits DESIR hall

free