1. CONSOLIDATION CPS-BL SYSTEM
V. Prieto Hermosilla AB/BI/BL

2. 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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3. PS LAYOUT TOTAL BL: 164 PS:100(4 SECTORS) TT2:8 nTOF:1 AD:2
Injection: 6
Booster:32 (2 SECTORS)
Transfer:10
ISOLDE:10
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4. PS BEAM LOSS ACEM (Al Cathode Electron Multiplier Tube)
Isat=100mA (Average anode current)(6.107particles in the ACEM/10ms)
Integration mode (fixed Gain)+ADC
Integration mode +Analog acquisition. (OASIS)
-800V<Vp<-1100V
Video (display 8 bits) + Survey (read out 12 bits using 8MSB, every 100ms)
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6. 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
IN/OUT Pb HV
CURRENT
CALIBRATION DATA
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7. CALIBRATION (II) 24/11/2018 CPS_BL SYSTEM Horizontal: sector number
Vertical: normalized units
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8. 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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9. 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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10. SPS (LHC) BEAM LOSS Ionization Chamber N2 filled Vp=800V (1500V)
SPS integration mode (Variable Gain)+ADC(15 bits)
LHC no gain change
Survey
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11. 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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12. 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 (>20% 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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13. 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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14. FIRST RESULTS
IC1&IC2 (Direct measurement)
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15. Electronics saturated
FIRST RESULTS
Electronics saturated
IC1&IC2 (LHC electronics)
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16. FIRST RESULTS IC vs. ACEM with PS electronics
IC vs. ACEM (direct current)
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17. 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: CHF
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18. PLANNING IF LHC ISSUES ALLOWS US, DURING 2008….
We are going to install and test:
8-16 IC’s 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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19. 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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20. That's all...thank you
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