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Inventory Overview of SPS Beam Current Transformers (BCTs) and Future Upgrades

This document covers the inventory of SPS Beam Current Transformers (BCTs) in various areas including LSS1, LSS3, LSS4, and fast transfer lines. It highlights notable BCTs such as TT2/TT10, TT40, and TT60/TI2, as well as discusses reliability issues stemming from radiation levels at LSS1 and the high maintenance costs associated with existing systems. Plans for the future are outlined, including new in-house installations, beam current measurements, and projects approved without the need for further funding. It emphasizes the need to address bandwidth limitations and improve measurement systems.

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Inventory Overview of SPS Beam Current Transformers (BCTs) and Future Upgrades

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  1. Inventory for SPS BCT’s • Ring DC BCTs (LSS1, LSS3, LSS4) • Fast Transfer-line BCTs: • TT2/TT10 (LIU-PS) • TT40 (+CNGS)/TI8 (beam 2 to LHC) • TT60/TI2 (beam 1 to LHC) • (CNGS TT41) • Fast RING BCTs: • LSS3 (31450)

  2. Ring DC BCT’s • Commercial (Bergoz) DCCTs acquired in BA1, BA3,BA4 • Reliability issue (radiation-levels LSS1) • Expensive maintenance contract. • BA3 and BA4 will be kept alive as long as needed. • Within NA61 ions project, two new in-house DCCT’s and one FBCT will be installed in LSS5 (51896) • Human protection and beam current measurements • Installation and first beam tests foreseen for mid 2012. • Acquisition for all beam types foreseen • Review specifications with SPS-LIU, e.g. 2.7E11 per bunch • Implementation of SPS MPS (B. Todd) ? • Lessons learned from LHC will be implemented • Project approved and likely no further funding needed.

  3. BCTFR 31450 issues • Bandwidth limited (acquisition at 40MHz) Tail in adjacent buckets (->75nsec), typically ~5-15% observed. Very long cables, could be improved by moving to LSS4 (space ?) Courtesy L. Jensen

  4. BCTFR 31450 issues Beam position and frequency dependency Courtesy L. Jensen In high bandwidth ~1%/mm has been observed in LHC on 50ns bunched, while in the SPS only ~0.1%/mm (75nsec beam). Parasitic MD on 50ns and 25ns and different bunch lengths to be done. Possible to implement turn by turn measurements (fast injection losses) Now ‘snap-shot’ every 40ms.

  5. BCTFR 31450 outlook • Measure position dependency with 25 and 50ns beams in SPS, and different bunch lengths. Spring 2011. • Understand SPS bandwidth limitations. Spring 2011. • Estimate dynamic range and resolution with 2.7E11 charges per bunch. Spring 2011. • Improve and test LHC FBCT beam position and bunch length dependencies. Mid 2011. • Decisions according to results and requirements. Autumn 2011. Also for 8* BCTFI.

  6. BCTFR 31450 outlook • Position dependency.Develop and install new BCT. 100 kCHF, 6MM LS1 2014 • Bandwidth limitation. Move to LSS4 50 kCHF1MM LS1 2014 • Turn by turn measurements. Software modifications 1 MM (low-level and application) During 2011

  7. Conclusions • Development of new DCCT for NA61 started, will comply to LIU specifications. No extra funding needed. • FBCT issues still to be understood. Decisions on upgrades to be taken later this year, depending on measured performance and client (LIU) specifications. • Turn by turn measurements on FBCTR can fairly easily be obtained.

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