CONSOLIDATION CPS-BL SYSTEM

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CONSOLIDATION CPS-BL SYSTEM

• V. Prieto Hermosilla AB/BI/BL

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OUTLINE

• The CPS BL Monitoring system
• Functionalities
• Calibration (PS vs. SPS)
• Main Problems
• New Options LHC-IC Test on PS
• Budget Planning

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PS LAYOUT
PS100(4 SECTORS) TT28 nTOF1
TOTAL BL 164
AD2
Injection 6 Booster32 (2 SECTORS) Transfer10 IS
OLDE10
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PS BEAM LOSS

• ACEM (Al Cathode Electron Multiplier Tube)
• Isat100mA (Average anode current)?(6.107particles
  in the ACEM/10ms)
• Integration mode (fixed Gain)ADC
• Integration mode Analog acquisition. (OASIS)
• -800VltVplt-1100V
• Video (display 8 bits) Survey (read out 12
  bits using 8MSB, every 100ms)

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CALIBRATION

• Every BL is tested in Lab. with a radioactive
  source (Cs137).We read the Idark(N) and the
  Isource(S) for several HV values. The signal
  adjustment is made for the nominal HV. If the
  ratio S/N is too large, the BL has to be changed.
• All the calibration is done in a dedicated test
  bench, designed in collaboration with SG-RP and
  BI-ML.
• Manpower 2 persons/6-8 weeks

CALIBRATION DATA
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CALIBRATION (II)
Horizontal sector number Vertical normalized
units
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CALIBRATION CPS (III)

• About 5 of monitors has to be changed every year
  (ratio S/N under the limit).
• 5-10 has to be relocated.
• Loss of gain in the oldest monitors.
• Electronics OK.
• Malfunctioning is mainly due to monitors aging

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MAIN PROBLEMS

• Old system 1980.
• Performance limited by the electronics.
• No spares for electronics obsolete components.
• Obsolete CAMAC Racks.
• Every detector has to be dismantled and
  calibrated every year.
• Non standard system different from SPS and LHC.

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SPS (LHC) BEAM LOSS

• Ionization Chamber
• N2 filled
• Vp800V (1500V)
• SPS integration mode (Variable Gain)ADC(15 bits)
• LHC no gain change
• Survey

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MEASUREMENTS(SPS)
GAIN SURVEY DONE IN 2004 AFTER MORE THAN 15 YEARS
OPERATION
Horizontal sector number Vertical normalized
units (mean 272)
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MEASUREMENTS SPS (II)

• Some problems (HT Cable, noise,GND) in 10 BL over
  287.
• Only 5 IC were replaced (extraction lines, high
  radioactive places) because the gas gain changed
  (gt20 after 20 years of operation) .
• Quite uniforms measurements in the whole SPS.
• Electronics OK.
• The malfunction is mainly due to network cable
  failures.

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LHC-IC TEST ON PS

• Two chambers installed on the S16 of the PS
  (August 2007)
• One in parallel with the beam pipe.
• One perpendicular to the beam pipe, on the
  magnet.
• Data taken to compare it with the actual BL
  system (with the same electronics or directly).
• New position needs to be decided

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FIRST RESULTS

• IC1IC2 (Direct measurement)

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FIRST RESULTS
Electronics saturated

• IC1IC2 (LHC electronics)

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FIRST RESULTS

• IC vs. ACEM with PS electronics

• IC vs. ACEM (direct current)

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BUDGET

• Signal Cables re-used with adaptors.
• HV Cables re-used (Main distribution changed on
  2006)
• Electronics new
• Detector new (LHC type)
• Mechanics new (LHC type)
• ESTIMATED BUDGET 250000 CHF

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PLANNING
IF LHC ISSUES ALLOWS US, DURING 2008.

• We are going to install and test
• 8-16 ICs in the PS.
• LHC Electronics and Software in the b.368.
• The threshold comparator program and the combiner
  program needs a modification but the Technical
  specification document has to be done before the
  software modification (with ABP and OP).

AND MAYBE DURING 2009 WE CAN INSTALL A NEW BL
SYSTEM IN THE CPS.
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SUMMARY

• The actual system works well but
• It is old.
• It is not standard compared with SPS and LHC.
• Detectors needs to be calibrated every year
• There are not spares for electronics.
• Electronics doesn't match detectors capabilities.
• Not uniform within the others.
• The test with the LHC-BL is quite encouraging.

..We have to continue to work on it.
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That's all...thank you