desir progress report desir hall details defined for civil construction: - compressed air, liquid...
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![Page 1: DESIR Progress Report DESIR hall details defined for civil construction: - compressed air, liquid nitrogen, cooling water, etc detailed layout of RFQ-HRS](https://reader036.vdocuments.net/reader036/viewer/2022062407/56649d055503460f949d873f/html5/thumbnails/1.jpg)
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
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Spiraland
GANIL
S3
DESIR
Level -1
Level 0
15 m
Production building
Accelerator
NFS S
RI
SPIRAL2 layout
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Production building
F. Varenne
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Spiraland
GANIL
S3
DESIR
Level -1
Level 0
15 m
Connections to DESIR
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12m
8m
HRS
RFQ
storage and maintenance
Legend:
Electronics
Quadrupole
Sextupole
Multipole
Dipole
RFQ and HRS cave
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The High Intensity RFQ Cooler SHIRaC
Length = 70 cm
Radius = 3mm
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Test bench at LPC-Caen (Oct 07/ Jan 08)
• Current tests are done with ionization source– Imax ~ 50 nA
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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
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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
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Beam transmission (Jun 08)• Cooler in RF-only : 10 % for 23Na+ and 133Cs+
• Transmission vs RF voltage for 133Cs+ :
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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
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Mass resolution:M/M = 20000
3 x’s, 3 y’s, 3 ’s, 3 ’s, 1 mass, 1 energy
3 mm mrad, 50 keV
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3 mm mrad, 50 keV
R = 22091
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Initial and final beam envelopsFirst and fifth order mass separation for 1/20000 mass difference
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0.2 mm shift of multipole: significant loss in mass resolution
more details on the poster of T. Kurtukian Nieto
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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
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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