CONSOLIDATION CPSBL SYSTEM V Prieto Hermosilla ABBIBL CPSBL

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

OUTLINE I. III. IV. V. VI. The CPS BL Monitoring system Functionalities Calibration (PS vs. SPS) Main Problems New Options: LHC-IC Test on PS Budget & Planning 19/10/2021 CPS_BL SYSTEM 2

PS LAYOUT PS: 100(4 SECTORS) TOTAL BL: 164 TT 2: 8 n. TOF: 1 AD: 2 Injection: 6 Booster: 32 (2 SECTORS) Transfer: 10 ISOLDE: 10 19/10/2021 CPS_BL SYSTEM 3

PS BEAM LOSS • ACEM (Al Cathode Electron Multiplier Tube) • Isat=100 m. A (Average anode current) (6. 107 particles in the ACEM/10 ms) • Integration mode (fixed Gain)+ADC • Integration mode +Analog acquisition. (OASIS) • -800 V<Vp<-1100 V • Video (display 8 bits) + Survey (read out 12 bits using 8 MSB, every 100 ms) 19/10/2021 CPS_BL SYSTEM 4

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CALIBRATION • • • Every BL is tested in Lab. with a radioactive source (Cs 137). 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 CURRENT CALIBRATION DATA HV Pb 19/10/2021 IN/OUT CPS_BL SYSTEM 6

CALIBRATION (II) Horizontal: sector number Vertical: normalized units 19/10/2021 CPS_BL SYSTEM 7

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 19/10/2021 CPS_BL SYSTEM 8

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. 19/10/2021 CPS_BL SYSTEM 9

SPS (LHC) BEAM LOSS • • Ionization Chamber N 2 filled Vp=800 V (1500 V) SPS integration mode (Variable Gain)+ADC(15 bits) • LHC no gain change • Survey 19/10/2021 CPS_BL SYSTEM 10

MEASUREMENTS(SPS) GAIN SURVEY DONE IN 2004 AFTER MORE THAN 15 YEARS OPERATION Horizontal: sector number Vertical: normalized units (mean 272) 19/10/2021 CPS_BL SYSTEM 11

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. 19/10/2021 CPS_BL SYSTEM 12

LHC-IC TEST ON PS • Two chambers installed on the S 16 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 19/10/2021 CPS_BL SYSTEM 13

FIRST RESULTS IC 1&IC 2 (Direct measurement) 19/10/2021 CPS_BL SYSTEM 14

FIRST RESULTS Electronics saturated IC 1&IC 2 (LHC electronics) 19/10/2021 CPS_BL SYSTEM 15

FIRST RESULTS IC vs. ACEM with PS electronics IC vs. ACEM (direct current) 19/10/2021 CPS_BL SYSTEM 16

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 19/10/2021 CPS_BL SYSTEM 17

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. 19/10/2021 CPS_BL SYSTEM 18

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. 19/10/2021 CPS_BL SYSTEM 19

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