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TT2 working group

TT2 working group. S Baird, D Berlin, J Buttkus, D Cornuet, G Coudert, G Daems, G Metral. Beams considered. 3.5 GeV protons to AD (direct and via TTL2) & D3 -1.2 sec cycles 14 GeV protons to SPS (CT) & D3 - 1.2 sec cycles 20 GeV ions and MD beam to SPS & D3 - 1.2 sec cycles

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TT2 working group

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  1. TT2 working group S Baird, D Berlin, J Buttkus, D Cornuet, G Coudert, G Daems, G Metral

  2. Beams considered • 3.5 GeV protons to AD (direct and via TTL2) & D3 -1.2 sec cycles • 14 GeV protons to SPS (CT) & D3 - 1.2 sec cycles • 20 GeV ions and MD beam to SPS & D3 - 1.2 sec cycles • 20 GeV protons to nTOF & D3 in dedicated - 1.2 sec cycles, and parasitic mode - 2.4 sec cycles • 26 GeV protons for AD, LHC, SPS & D3 - 2.4 sec cycles

  3. Cycling • Cycling is required if an element has more than two values (incl. zero) • Method is:- • If new value is below current value - set New directly • If new value above current value then cycle - • Min - Max - New • TT2 pulsed power supplies cannot pulse in less than 900 msecs. • Therefore, for all operational beams, we assume a maximum of 900 msecs to cycle and set the elements of the TT2 line.

  4. BHZ247 LEP/LHC SPS TT10 FTS FT12 Dump D3 3.5 & 26 GeV Protons direct to AD AD nTOF FTA TT2A FTN PS TTL2 (ATP) BTI247 TT2 (FT16)

  5. One exception - BTI247 BTI247 has three operational values “zero”, 3.5 GeV direct to AD and 26 GeV direct to AD. AD can never request 3.5 GeV and 26 GeV protons in the same super-cycle, so BTI247 does not cycle. BTI247 is equipped with a small auxiliary power supply to compensate the remanent field when setting the power supply to zero. This supply is set to 18.5 amps (re-checked in 2001 start-up) BHZ327 & BHZ377 have similar aux. supplies, which are not used

  6. Initial cycling times • Initially the following power supplies did not meet our 900 msecs criteria:- • Supply Cycle time (msecs) • BHZ117 980 • BHZ147 1200 • BHZ167 960 • BHZ377 2000 • BVT123 980 • BVT173 940 • QDE210S 960 • QFO205 960 • QFO215S 1000 • QFO375 960

  7. This cycle time was found to include around 100 msec delay due to the sequential nature of the power supply control. Once CO removed this delay only two elements did not meet our 900 msec. criteria • BHZ147 1200 msecs • BHZ377 2000 msecs

  8. BHZ147 LHC SPS TT10 FTS FT12 Dump D3 AD Dump D2 nTOF FTA TT2A FTN PS TTL2 (ATP) BTI147 TT2 (FT16)

  9. BHZ147 D2 is never used, therefore the minimum value needed for BHZ147 could be increased, reducing the cycling time It was possible to reduce the cycle time below 900msec. BHZ147 is no longer a problem

  10. BHZ377 LEP/LHC SPS TT10 FTS FT12 Dump D3 All beams to SPS AD nTOF FTA TT2A FTN BHZ377 PS TTL2 (ATP) TT2 (FT16)

  11. BHZ377 The cycle time cannot be decreased significantly This restricts the 1.2 second cycles that can be placed before beams for the SPS. Current solution: Restrict super-cycle composition Ideal solution: A new, but identical power converter, so that both BHZ 377 and BHZ 378 can be powered separately. Approximate cost estimation 150 kCHf (PO)

  12. BHZ247 LEP/LHC SPS TT10 FTS FT12 Dump D3 3.5 & 26 GeV Protons direct to AD AD nTOF FTA TT2A FTN PS TTL2 (ATP) BTI247 TT2 (FT16)

  13. BHZ247 BTI247 does not cycle but it has three operational values “zero”, 3.5 GeV and 26 GeV to AD. The problem is that, when ramping the main supply down to zero, the secondary supply oscillates for 350msec after reaching “zero field”. Now the only 3.5 GeV beam is for AD but AD can never request 3.5 GeV and 26 GeV protons at the same time. Conclusion BHZ247 is not a problem, but we need remote control & status information for the secondary supply

  14. BHZ403 LEP/LHC SPS TT10 FTS FT12 Dump D3 20 GeV Protons to nTOF AD nTOF FTA TT2A FTN BHZ403 PS TTL2 (ATP) TT2 (FT16)

  15. BHZ403 BHZ403 is not cycled. It has only two values. There were some doubts about the setting time being too long to switch between TOF and D3 for 1.2 second cycles. After work by PO the power supply for BHZ403 can switch from 20 GeV to “zero” and back as needed. However the remanent field effect in the magnet still has to be checked with beam under all conditions.

  16. Conclusions BHZ247 needs no further work unless we have another 3.5 Gev user for TT2 (other than AD). We still need remote control and status information etc. For BHZ377 the solution would be a new power supply for around 150 kCHf The remanent field at “zero” for BHZ403 needs to be checked with beam.

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