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Status of the Front End Test Stand April 2007

Status of the Front End Test Stand April 2007. R8 refurbished Laser lab under construction Vacuum system for first section delivered Stands for accelerator ordered Basic electronic equipment for first phase delivered. Infrastructure. Ion source development.

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Status of the Front End Test Stand April 2007

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  1. Status of the Front End Test Stand April 2007

  2. R8 refurbished Laser lab under construction Vacuum system for first section delivered Stands for accelerator ordered Basic electronic equipment for first phase delivered Infrastructure

  3. Ion source development 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

  4. 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

  5. LEBT- 1st vacuum vessel design

  6. LEBT 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. Initial beam distribution based on pepper-pot data rms norm ~ 0.9 mm mrad 1% beam loss At end of LEBT

  7. RFQ cold model The 4 quadrants of the 4 vane RFQ cold model (l=0.5 m) are machined. The quality of the quadrants will be controlled by using a CMM and beat pull measurements will be performed before and after brazing.

  8. 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

  9. MEBT and Chopper • MEBT & 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

  10. MEBT & Chopper – code benchmarking Lattice: FETS Scheme A Codes: TraceWin/Partran, Trace3D, GPT TraceWin/Partran GPT

  11. Copper block Scintillator screen Fast CCD Camera H- Ion Beam H- Beamlets Tungsten screen Pepper pot emittance measuring device The grid head is mounted to the cooled rod. The linear shift mechanism mounted to the main flange. Cooled feed through rod. Close up of the assembled grid head showing the quartz plate. A pepper pot device mounted on a linear stage for correlated measurements of the transversal phase space along beam propagation will be available soon. Adjustable camera mount.

  12. Pepperpot data analyses test Image width: 100mm x-x’ y-y’ Camera res. = 49 microns/pixel Angle res. = 4.88 mrad

  13. Laser tomography Motion controller Amplifiers and power supplies Encoders Rotary stage Linear stage

  14. Laser emittance R=477.5mm Arc length 500mm B = 0.522T Gap 136mm Width 200mm Deflection 60deg max. beam size ~R=20mm negative ions, RG neutrals At the position of photon interaction can be detected a max. beam diameter of 40mm with +/-30mrad (a matched ion beam has app. 20mm and +/-20mrad). photo detached neutrals deflected negative ions

  15. Laser emittance space for piezo driven stages vacuum vessel

  16. 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 Summary & outlook

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