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Status
of the
Front End Test Stand
April 2007
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Infrastructure
• R8 refurbished
• Laser lab under construction
• Vacuum system for first section delivered
• Stands for accelerator ordered
• Basic electronic equipment for first phase delivered
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Extensive experimental program underway on the IS rig. Main goal is the reduction of the source emittance by roughly a factor of 3.
57 mm
Ion source development
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Ion source – transversal density distributionas a function of extraction potential
5 kV Ext 5.5 kV Ext 6 kV Ext 6.5 kV Ext
7 kV Ext 8 kV Ext 9 kV Ext 11 kV Ext
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LEBT- 1st vacuum vessel design
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LEBTInitial beam distribution based on pepper-pot data
At end of LEBT
rms norm ~ 0.9 mm mrad
1% beam loss
Universidad del Pais Vasco joined the collaboration =>
responsible for LEBT (in cooperation with Warwick) & beam dump
3D model of B-fields incorporated into simulations => slight increase in field strength required.
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RFQ cold model
The quality of the quadrants will be controlled by using a CMM and beat pull measurements will be performed before and after brazing.
The 4 quadrants of the 4 vane RFQ cold model (l=0.5 m) are machined.
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First RF measurements on the unbrazed RFQ cold model
First tests of the cold model using new couplers showed a resonant frequency of ~ 323 MHz
A very good field flatness has been
measured using the beat pull method
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MEBT and ChopperMEBT & Chopper:
-Transition from particle trajectory design to real design
- Incorporation of pumping ports etc. into design and reoptimisation of beam dynamics
Hybrid quadrupoles:
- The printed circuit electromagnet: A company near Newbury specialised in printed circuit boards manufacturing. In progress.
- Daresbury Magnet Testing Group agreed to measure the PMQ in the next month. (Point by point measurement with a Hall probe).
Particle dynamics:
- Comparison between CERN and RAL design (IS to end of DTL) showed slightly better results for RAL solution - simulations with higher current are planned.
- Code benchmarking in progress
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MEBT & Chopper – code benchmarking
TraceWin/Partran
GPT
Lattice: FETS Scheme A Codes: TraceWin/Partran, Trace3D, GPT
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Pepper pot emittance measuring device
Close up of the assembled grid head showing the quartz plate.
The grid head is mounted to the
cooled rod.
The linear shift mechanism mounted to the main flange.
Adjustable camera mount.
Cooled feed through rod.
Tungsten screen
Copper block Scintillator screen
H- Beamlets
Fast CCD CameraH- Ion Beam
A pepper pot device mounted on a linear stage for correlated measurements of the transversal phase space along beam propagation will be available soon.
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Pepperpot data analyses test
Camera res. = 49 microns/pixel Angle res. = 4.88 mrad
Image width: 100mmx-x’
y-y’
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Laser tomography
Motion controller
Rotary stage
Amplifiers and
power supplies
Linear stage
Encoders
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Laser emittance
negative ions,RG neutrals
phot
o de
tach
edne
utra
ls
deflected negative ions
R=477.5mmArc length 500mm
B = 0.522TGap 136mm
Width 200mmDeflection 60deg
max. beam size ~R=20mm
At the position of photoninteraction can be detected
a max. beam diameterof 40mm with +/-30mrad(a matched ion beam has
app. 20mm and +/-20mrad).
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Laser emittancePhotodetachment Diagnostic Dipole (FETS)
D:\FETS\MAGNET\POISSON-SIMULATIONEN\H-MAGNET\UEBUNG@UNI\VERS-E_YOKE+COIL VARIATION\DIPOLE016.AM 2-12-2007 18:55:56
-10
0
10
20
30
40
50
60
-10
0
10
20
30
40
50
60
-20 -10 0 10 20 30 40 50 60 70 80 90
good field region20cm
4cm15cm
vacu
umve
ssel
space for piezo driven stages
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Summary & outlook
• Very good progress on all fields
• IS optimisation is a major physical challenge but
first results are encouraging
• RFQ cold model pre tests started
• Infrastructure for first phase prepared
• Good collaboration with Spanish partners