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Requirements of the ESS BLM. by Lali Tchelidze CERN, Geneva, 18 Oct. 2011. The ESS . ESS: Ion source Linac Target Neutron instruments 5 MW average power 2.5 GeV protons 2.86 ms pulse 50 mA pulse current 14 Hz repetition rate - similar to SNS, but higher power and long pulse.

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Requirements of the ESS BLM

byLaliTchelidze

CERN, Geneva, 18 Oct. 2011

the ess
The ESS

ESS:

Ion source

Linac

Target

Neutron instruments

5 MW average power

2.5 GeV protons

2.86 ms pulse

50 mA pulse current

14 Hz repetition rate

- similar to SNS, but higher power and long pulse.

Max-IV

ESS

blm requirements
BLM requirements
  • BLM should produce a beam abort signal in less than 2 μs.
    • Faster than SNS detector is needed (?);
    • We’ve redesigned the current SNS ionization chamber (shorter gap in between the electrodes) to achieve faster ion collection time;
    • Prototype quoting/ordering under process;
    • Will test and compare the SNS, LHC and the prototype ionization chamber charge collection times as soon as we get all three;
dynamic range and sensitivity
Dynamic range and Sensitivity
  • DR – large enough to detect slow signals, yet not saturate at high losses.
    • 1 W/m (at 1 foot) -> 100 mR/h beam-off dose rate -> 100 R/h beam-on dose rates!
    • 2 mR/pulse -> 0.69 R/sec during 2.86 msec pulse.
      • @ SNS they never use more than 1000.
  • Sensitivity - 70 nA/R/s (or even less) is probably enough.
cryogenic requirements
Cryogenic requirements
  • A hybrid design of a cryostat is foreseen for ESS.
      • an operating loss detector might be needed at 70 K / 2 K!
  • Physical size of the detector should not be very small – to cover a “large” part of the loss area.