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p-bar d-cel: keV antiproton pulses

p-bar d-cel: keV antiproton pulses. introduction and concept p-bar d-cel simulations ISOLTRAP@ISOLDE consequences on GBAR layout. David Lunney CSNSM (IN2P3-CNRS) Université de Paris Sud, Orsay. With crucial help from: V. Manea, S. Cabaret, P. Dupré, S. Dephine (CSNSM)

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p-bar d-cel: keV antiproton pulses

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  1. p-bar d-cel:keV antiproton pulses • introduction and concept • p-bar d-cel simulations • ISOLTRAP@ISOLDE • consequences on GBAR layout David Lunney CSNSM (IN2P3-CNRS) Université de Paris Sud, Orsay With crucial help from: V. Manea, S. Cabaret, P. Dupré, S. Dephine (CSNSM) and Robert Wolf (U. Greifswald)

  2. 1-keV p pulse deceleration and pulsed drift tube: concept 1 keV 0.2 m 40 mm mrad From ELENA: 100 keV p pulse 300 ns (1.3 m) 4mm mrad drift tube - 99 kV - 99 kV

  3. deceleration and pulsed drift tube: simulation SIMION simulations by Vladimir Manea

  4. Transport from decelerator to reaction chamber (GIOS)

  5. Full simulations of antiproton deceleration and focusing • Deceleration • Focusing • One single simulation of the 3 m path of the ions from the entrance to the deceleration setup to the injection into the positronium chamber. • Optimization of the deceleration and focusing voltages, as well as of the setup geometry, for a maximum transport efficiency through the positronium chamber (preliminary value 15%). SIMION simulations by Vladimir Manea

  6. prototype instrument at the CSNSM, Orsay (March 2012)

  7. ISOLTRAP spectrometer at ISOLDE (2 Penning, 1 Paul, 1 MR-tof trap) 100- 3000ms 100- 500ms 0.001- 1000ms 5-10ms 1-30ms 60-kV, 1-kHz pulsed drift-tube switch

  8. Exotic nuclides and anti-matter major difference: buffer gas!

  9. HV-switch circuit HeinzingerPNChp ±60kV, 10mA dU<10-5Unom/8h; dUrf,pp<10-5Unom ; dUtemp<10-5Unom/K communication: GPIB, RS232, analog U τ=40ns t=11us Behlke HTS 651-10-GSM, 65kV, 100Apk dVdrop < 30V @ 60kV 5k t=400ns τ=1.1us t 500nF 200M 220pF 75→175 ISOLTRAP Collaboration meeting 2011

  10. New HV-switch parts Behlke HTS 651-10-GSM + direct liquid cooling (DLC)* Buffer capacitor and RF-sealed copper housing Switch Pump Radiator 500nF 60kV 900J 200MOhm resistor HeinzingerPNChp 60kV, 10mA ISOLTRAP Collaboration meeting 2011 *GALDEN HT135

  11. HV-switch present status and performance Power dissipation and load capacitance extrapolated to 60kV @ 200Hz Maximum power dissipation at around 1200Hz switching frequency ISOLTRAP Collaboration meeting 2011

  12. HV-switch present status and performance peak shape with new setup taken from Zn run peak shape with old setup 80Rb large tail no tail 80Zn close to gaussian shape ISOLTRAP Collaboration meeting 2011

  13. HV-switch present status and performance under-critical damping: increasing resistance necessary 75 Ohm → 175 Ohm ISOLTRAP Collaboration meeting 2011

  14. HV cage reassembly 60kV FUG HVcage RFQ Buncher HVpd Alkali ion source HV switch setup ISOLTRAP Collaboration meeting 2011

  15. HV cage reassembly 60kV FUG HVcage dU via CS class* RFQ Buncher 60kV Heinzinger HVpd Alkali ion source HV switch setup ISOLTRAP Collaboration meeting 2011 * by Christopher

  16. HV-switch Safety Dividing the HV cages demands a separate safety installation for the HV-switch cage: If VETO is set, LOW status is active -> HVpd=0V Control System TPG 300 pressure Center 3 pressure trigger p Buncher p drift tube trigger IN VETO 1-4 optional: trigger optical OUT and trigger TTL OUT (manual reset button) Pump and Fan status Tacho Pump and Fan speeds Temp.: Fore, Back, Pump 9V DC power supply Cooling system trigger optical IN trigger TTL IN direct trigger switch status monitor trigger IN switch status optical 24V DC power supply status OUT: Temp, Freq., DC 5V DC power supply Line voltage Trigger & Veto terminal 5V DC IN switch and cooling controller Behlke switch attached to cooper box grounding

  17. GBAR layout issues

  18. Extraction from ELENA in a short straight section 25 January 2012 CERN Transfer line WS / Pavel Belochitskii 20

  19. beam transport energy: 60 keV

  20. H+Production _ H _ p ~ keV + _ H P o s SiO2 coating Ortho-positronium e + ~ 2 keV fast extraction from trap

  21. p p e e H H+ GBAR – reaction chamber trajectories ?  ? ?

  22. AD1-5?

  23. AD1-5?

  24. AD1-5?

  25. Summary • Decelerator • Pulsed drift scheme: start from working instrument (60 kV) • First simulations show phase space conserved • transmission not disastrous (35%) • Layout issues • Question: are H+, p-, e+ beams interesting for others? • Extraction and transport part of ELENA (i.e. resp. CERN)? • Positioning of equipment… • different extraction segment? • rotating ELENA? • increasing ELENA kicker-bender angle? • adding multipoles? ISOLTRAP Collaboration meeting 2011

  26. AD1-5?

  27. ELENA layout in AD Hall 25 January 2012 CERN Transfer line WS / Pavel Belochitskii

  28. HV-switch modification old circuit: new circuit: • Design objectives: • Repetition rate up to 1kHz @ 60kV • Stable high-voltage potential • Safety, Reliability • Challenges: • Power dissipation: up to 600W • RF-noise • Drawbacks: • Repetition rate max. 3Hz • dropping HVcage potential • (Leakage current issue) ISOLTRAP Collaboration meeting 2011

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