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PSB ISOLDE specific aspects

This article explores the machine layout, different beams, beam steering, focusing, and the ISOLDE security chain in PS-Booster operation for ISOLDE. It also discusses specific aspects such as staggered beam operation and semgrids.

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PSB ISOLDE specific aspects

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  1. PSB ISOLDE specific aspects PS-Booster Operation for ISOLDE

  2. PS-Booster operation for ISOLDE • Machine layout • Different Beams • Beam Steering • Focusing • ISOLDE Security Chain • Summary E. Siesling AB/OP

  3. PS Complex layout E. Siesling AB/OP

  4. PSB layout E. Siesling AB/OP

  5. ISOLDE layout E. Siesling AB/OP

  6. Different Beams • ISOHRS • ISOGPS • STAGISO: Staggered beam E. Siesling AB/OP

  7. ISOHRS • Beam to the HRS target (High Resolution Separator) • High intensity proton beam up to 3E13ppp (protons per pulse) at an energy of 1,4GeV/c • Occasionally 1GeV/c • Typical target types: Uranium-Carbide-powder, Tantalum-foil, Niobium-foil, etc. E. Siesling AB/OP

  8. ISOHRS timing & extraction • ISOHRS cycle: basic period 1,2 seconds • PSB in h=1 mode, 1 bunch per ring, distance between bunches 572ns (157m) • Extraction: 4 equidistant bunches: Ring 3, 4, 2, 1. Bunch-length 250ns E. Siesling AB/OP

  9. ISOHRS extraction ejection in the order3-4-2-1 4 3 t0 to ISOLDE 2 1 4 from 3 from 4 3 t1 2 1 from 2 K. Hanke from 1 E. Siesling AB/OP

  10. ISOHRS extraction to ISOLDE t1 4 equidistant bunches Bunch-length 250ns t=572ns (157m) E. Siesling AB/OP

  11. BT4.BVT10 BT4.SMV10 BT4.KFA10 from R4 from R3 from R2 BT.KFA20 BT.SMV20 from R1 BT.BVT20 BT1.KFA10 BT1.SMV10 BT1.BVT10 septa kickers septum kicker dipole dipoles K. Hanke E. Siesling AB/OP

  12. ISOHRS line Fragmentation Spallation Fission E. Siesling AB/OP

  13. ISOGPS • Beam to the GPS target (General Purpose Separator) • High intensity proton beam up to 3E13ppp (protons per pulse) at an energy of 1,4GeV/c • Occasionally 1GeV/c • Typical target types: Uranium-Carbide-powder, Tantalum-foil, Niobium-foil, etc. E. Siesling AB/OP

  14. ISOGPS timing & extraction • ISOGPS cycle: basic period 1,2 seconds • PSB in h=1 mode, 1 bunch per ring, distance between bunches 572ns (157m) • Extraction: 4 equidistant bunches: Ring 3, 4, 2, 1. Bunch-length 250ns E. Siesling AB/OP

  15. ISOGPS line Fragmentation Spallation Fission E. Siesling AB/OP

  16. Staggered beam: STAGISO • Beam to the HRS or GPS target • Low intensity proton beam. Depending on target between 5E12 to 1E13ppp • Reduced shock at impact for more ‘sensitive’ liquid metal targets • Typical targets: Sensitive Liquid metal: Lead, Tin, etc. E. Siesling AB/OP

  17. STAGISO: timing & extraction • ‘Staggered’: bunches as far from each other as possible, 10us • Specific operation: 3 bunches instead of 4 • 3 consecutive bunches from ring 3, 4, 2bunch-length 150ns. Ring 1 is empty. Limitation: kicker BT.KFA20 pulses 2us max and needs 30ms to recharge E. Siesling AB/OP

  18. Limitation: kicker BT.KFA20 pulses 2us max and needs 30ms to re-charge.. BT4.BVT10 BT4.SMV10 BT4.KFA10 from R4 from R3 from R2 BT.KFA20 BT.SMV20 from R1 BT.BVT20 BT1.KFA10 BT1.SMV10 BT1.BVT10 septa kickers septum kicker dipole dipoles K. Hanke E. Siesling AB/OP

  19. STAGISO specific Op’s • STAGISO settings are loaded on top of a ISOHRS or ISOGPS and will only change the way of extraction at the booster • Use NAOS to measure and verify correct timing of bunch-length and time between bunches E. Siesling AB/OP

  20. STAGISO on ISOGPS Fragmentation Spallation Fission E. Siesling AB/OP

  21. PS-Booster operation for ISOLDE • Machine layout • Different Beams • Beam Steering • Focusing • ISOLDE Security Chain E. Siesling AB/OP

  22. Beam Steering and Focusing • END_LINE_ISOLDE workingset E. Siesling AB/OP

  23. Steering • BTY.DHZ211 and BTY.DVT212 for GPS proton beam steering • BTY.DHZ323 and BTY.DVT324 for HRS proton beam steering E. Siesling AB/OP

  24. Steering elements GPS steering HRS steering E. Siesling AB/OP

  25. Steering by ISOLDE operator • At each target-change:Proton Scan: Final steering of the proton beam will be done by the ISOLDE Operator E. Siesling AB/OP

  26. Steering Secundary nuclei 60kV accelerated p+ VERT HOR E. Siesling AB/OP

  27. PS-Booster operation for ISOLDE • Machine layout • Different Beams • Beam Steering • Focusing • ISOLDE Security Chain E. Siesling AB/OP

  28. Focusing Fragmentation, Spallation, Fission • Standard focus • Waist of beam at target(converter targets) Fragmentation, Spallation,Fission n n n n E. Siesling AB/OP

  29. p+ p+ p+ p+ p+ p+ Focusing: targets Target Target Converter Converter Target Standard E. Siesling AB/OP

  30. Focusing • BTY.QDE209 and BTY.QFO210 for GPS proton beam focusing • BTY.QDE321 and BTY.QFO322 for HRS proton beam focusing E. Siesling AB/OP

  31. Focusing elements GPS focus HRS focus E. Siesling AB/OP

  32. Focus settings E. Siesling AB/OP

  33. Wrong Focus Liquid metal target: Cracked container welds Converter target: Twisted W convertor rod E. Siesling AB/OP

  34. Semgrids • Current provoked by beam hitting the grid-wires: Secondary EMission • To measure displacement in the horizontal and vertical plane as well as shape of the beam e- p+ E. Siesling AB/OP

  35. Semgrid workingset • Fixed semgrids: Measure -> SMG Isolde GPS/HRS Line: GPS.MSF10 and HRS.MSF10 • Semgrid target:Measure -> SMG Isolde Target Rep.: BTY.MSG01 • Attn. make sure PLS is set correctly! E. Siesling AB/OP

  36. Semgrids GPS.MSF10 Semgrid target BTY.MSG01 HRS.MSF10 E. Siesling AB/OP

  37. Semgrids ‘Beam displacement’ Gaussian fit: I/Imax=e -(x-)²/2² 100% I/Imax=0.6 when (x-)=± 60% 84% 95% ‘Beam width’ ±=84% ±2=95%   +2 - + -2 E. Siesling AB/OP

  38. PS-Booster operation for ISOLDE • Machine layout • Different Beams • Beam Steering • Focusing • ISOLDE Security Chain E. Siesling AB/OP

  39. ISOLDE Security Chain Controlling: Door 901 (Target-Zone) Door 902 Separator Zone HRS Separator Zone GPS High Voltage Room + HV room E. Siesling AB/OP

  40. Door 901 Target zone Door 902 GPS Separator zone Shielding door High Voltage room HRS Separator zone GPS door HRS door E. Siesling AB/OP

  41. Target zone: Secure: -Zone closed, interlock keys in place (MCR), all access keys in place (door 901) Access: (behind shielding door: e.g. target change) -Security interlock tripped: BTY.BVT101 off and BTY.STP103 shut -Ventilation ok (1/2 hr after switching to access mode at ISOLDE) -Veto TIS off -Shield door can be moved -Access authorized persons under TIS supervision -> Access key + HV room E. Siesling AB/OP

  42. BTY.BVT101 & BTY.STP103 ISOLDE (BTY) booster E. Siesling AB/OP

  43. Separator zones: As of 2005: Considered as primary zones Secure: -Zone closed, interlock keys in place (MCR), access key in place (ICR) Access: -Security interlock tripped: BTY.BVT101 off and BTY.STP103 shut -Veto TIS off -Release Sep. zone access key in the ICR Primary zones + HV room E. Siesling AB/OP

  44. High Voltage room: (Secundary zone) Secure: -Zone closed, interlock keys in place (MCR), access key in place (ICR) Access: -Radiation monitor PAXY05 < 100uS/h Violating this rule will set off a radiation alarm in the MCR! + HV room E. Siesling AB/OP

  45. Summary • Different beams: ISOHRS, ISOGPS, STAGISO • Proton beam steering: END_LINE_ISOLDEProton scan for each target by the ISO-OP • Focusing: Standard, On Waist • Security Chain:ISOLDE target-zone is ‘hot’!Bender BTY.BVT101 and stopper BTY.STP103 E. Siesling AB/OP

  46. Thank you for your attention

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