1. ANNE I. S. HOLM AARHUS UNIVERSITET INSTITUT FOR FYSIK OG ASTRONOMI 17.04.2013 BASELINE DESIGN OF THE ESS HIGH ENERGY BEAM TRANSPORT LINE ANNE I. S. HOLM 17.04.2013 BASELINE DESIGN OF THE ESS HIGH ENERGY BEAM TRANSPORT LINE

2. AARHUS UNIVERSITET INSTITUT FOR FYSIK OG ASTRONOMI BASELINE DESIGN OF THE ESS HIGH ENERGY BEAM TRANSPORT LINE ANNE I. S. HOLM 14.03.2013 PURPOSE › Transport beam to the target › Shape the beam profile and size at target › Provide beam to a tuning and commissioning dump › Be able to diagnose the beam energy and energy spread › Be loss free 2

3. AARHUS UNIVERSITET INSTITUT FOR FYSIK OG ASTRONOMI BASELINE DESIGN OF THE ESS HIGH ENERGY BEAM TRANSPORT LINE ANNE I. S. HOLM 14.03.2013 OPTIMIZATION PARAMETERS › Large aperture to beam size ratio › Easy upgradable › 4.5 m elevation 3

4. AARHUS UNIVERSITET INSTITUT FOR FYSIK OG ASTRONOMI BASELINE DESIGN OF THE ESS HIGH ENERGY BEAM TRANSPORT LINE ANNE I. S. HOLM 14.03.2013 UPGRADE HIGH BETA 4 › Linac focusing structure  Linac Warm Unit › = 30 deg

5. AARHUS UNIVERSITET INSTITUT FOR FYSIK OG ASTRONOMI BASELINE DESIGN OF THE ESS HIGH ENERGY BEAM TRANSPORT LINE ANNE I. S. HOLM 14.03.2013 ACHROMAT 5 › 4.5 m elevation

6. AARHUS UNIVERSITET INSTITUT FOR FYSIK OG ASTRONOMI BASELINE DESIGN OF THE ESS HIGH ENERGY BEAM TRANSPORT LINE ANNE I. S. HOLM 14.03.2013 TUNE-UP DUMP 6 › Commissioning and daily tuning › RMS @ dump = 12.5 mm

7. AARHUS UNIVERSITET INSTITUT FOR FYSIK OG ASTRONOMI BASELINE DESIGN OF THE ESS HIGH ENERGY BEAM TRANSPORT LINE ANNE I. S. HOLM 14.03.2013 DIAGNOSTICS DUMP 7 › Diagnose the beam › RMS @ dump = 12.5 mm › RMS(D)/RMS(  )=6-8

8. AARHUS UNIVERSITET INSTITUT FOR FYSIK OG ASTRONOMI BASELINE DESIGN OF THE ESS HIGH ENERGY BEAM TRANSPORT LINE ANNE I. S. HOLM 14.03.2013 DIAGNOSTICS DUMP 8 2 dipole design: RMS(D)/RMS(  )=6-8 3 dipole design: RMS(D)/RMS(  )=10-14 4 dipole design: RMS(D)/RMS(  )=15-35

9. AARHUS UNIVERSITET INSTITUT FOR FYSIK OG ASTRONOMI BASELINE DESIGN OF THE ESS HIGH ENERGY BEAM TRANSPORT LINE ANNE I. S. HOLM 14.03.2013 OPTIMIZATION PARAMETERS A2T › Peak current density (PCD) @ target (< 64  A/cm 2 ) › Power deposit outside footprint (160 mm x 60 mm) › Power deposit @ fixed collimator. › Beam loss inside A2T elements › Double waist after the last quadrupole 9

10. AARHUS UNIVERSITET INSTITUT FOR FYSIK OG ASTRONOMI BASELINE DESIGN OF THE ESS HIGH ENERGY BEAM TRANSPORT LINE ANNE I. S. HOLM 14.03.2013 ACCELERATOR 2 TARGET 10 › PCD @ target = 58  A/cm 2 › PCD @ PBW = 90  A/cm 2 › Power @ Collimator = 670 W Neutron Shield Fixed Collimator PBW Octupoles

11. AARHUS UNIVERSITET INSTITUT FOR FYSIK OG ASTRONOMI BASELINE DESIGN OF THE ESS HIGH ENERGY BEAM TRANSPORT LINE ANNE I. S. HOLM 14.03.2013 BEAM PROFILES (BP) 11 Target = 58  A/cm 2 PBW = 90  A/cm 2 Outside = 0.5 % Target = 49  A/cm 2 PBW = 77  A/cm 2 Outside = 2.7 % Target = 44  A/cm 2 PBW = 68  A/cm 2 Outside = 7.4 %

12. AARHUS UNIVERSITET INSTITUT FOR FYSIK OG ASTRONOMI BASELINE DESIGN OF THE ESS HIGH ENERGY BEAM TRANSPORT LINE ANNE I. S. HOLM 14.03.2013 BP SPECIFICATIONS… 12 Normal conditionsOff-normal unit Zone T1 <10 pulses<1 pulses Horizontal width160 mm Vertical width60 mm Beam power within footprint>90>50 % of nominal current Maximum current density<64<100 mA/cm2 Horizontal tolerance on beam centroid±6 mm Vertical tolerance on beam centroid±6 mm Zone T2 Horizontal width160-200 mm Vertical width60-70 mm Horizontally integrated power deposit <9 <45 % of nominal current Vertically integrated power deposit <1 <5 % of nominal current Zone T3 Horizontal width>200 mm Vertical width>70 mm Horizontally integrated power deposit???% of nominal current Vertically integrated power deposit???% of nominal current Target

13. AARHUS UNIVERSITET INSTITUT FOR FYSIK OG ASTRONOMI BASELINE DESIGN OF THE ESS HIGH ENERGY BEAM TRANSPORT LINE ANNE I. S. HOLM 14.03.2013 BP SPECIFICATIONS… 13 Proton Beam Window Normal conditionsOff-normal unit Zone W1 <10 pulses<1 pulses Horizontal width192 mm Vertical width70 mm Beam power within footprint>99 ????% of nominal current Maximum current density<100 ????mA/cm2 Horizontal tolerance on beam centroid±6 mm Vertical tolerance on beam centroid±6 mm Zone W2 Horizontal width192-350 mm Vertical width70-350 mm Horizontally integrated power deposit ?? ??% of nominal current Vertically integrated power deposit ?? ??% of nominal current Zone W3 Horizontal width>350 mm Vertical width>350 mm Horizontally integrated power deposit ? ??% of nominal current Vertically integrated power deposit ? ??% of nominal current

14. AARHUS UNIVERSITET INSTITUT FOR FYSIK OG ASTRONOMI BASELINE DESIGN OF THE ESS HIGH ENERGY BEAM TRANSPORT LINE ANNE I. S. HOLM 14.03.2013 STEP FIELD MAGNETS – ”A DIFFERENT OCTUPOLE” 14

15. AARHUS UNIVERSITET INSTITUT FOR FYSIK OG ASTRONOMI BASELINE DESIGN OF THE ESS HIGH ENERGY BEAM TRANSPORT LINE ANNE I. S. HOLM 14.03.2013 A2T WITH SFM 15 › Loss @ Collimator = 360 W › PCD @ target = 46  A/cm 2 › PCD @ PBW = 72  A/cm 2 Neutron Shield Fixed Collimator PBW Step-Field-Magnets

16. AARHUS UNIVERSITET INSTITUT FOR FYSIK OG ASTRONOMI BASELINE DESIGN OF THE ESS HIGH ENERGY BEAM TRANSPORT LINE ANNE I. S. HOLM 14.03.2013 BEAM PROFILES 16 Target = 48  A/cm 2 PBW = 74  A/cm 2 Outside = 0.02 % Target = 41  A/cm 2 PBW = 64  A/cm 2 Outside = 9 %

17. AARHUS UNIVERSITET INSTITUT FOR FYSIK OG ASTRONOMI BASELINE DESIGN OF THE ESS HIGH ENERGY BEAM TRANSPORT LINE ANNE I. S. HOLM 14.03.2013 CONCLUSIONS 17 HEBT Baseline Design › PCDs depend on allowed power at target edge [0.5%-7.4%]  [(58-44)  A/cm 2 ] @ target & [[(90-68)  A/cm 2 ] @ PBW › Nominal beam  only loss at the fixed collimator HEBT Design with Step Field magnets › PCDs depend on allowed power at target edge [0.02%-8.9%]  [(48-41)  A/cm 2 ] @ target & [[(74-64)  A/cm 2 ] @ PBW › Nominal beam  only loss at the fixed collimator

18. AARHUS UNIVERSITET INSTITUT FOR FYSIK OG ASTRONOMI BASELINE DESIGN OF THE ESS HIGH ENERGY BEAM TRANSPORT LINE ANNE I. S. HOLM 14.03.2013 FUTURE/CURRENT STUDIES 18 › Stability of OPs versus SFMs with regards to: › Emittance › Halo › Misaligment