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Field quality of the DS and MS Short Straight Sections.

This document discusses the status of cold measurements in SM18, proposing strategies for the 6XX and 5XX series magnet measurements, and outlining the correlation between warm and cold measurements. It also covers limitations, operations, mechanics, and proposes methods for the magnetic measurements.

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Field quality of the DS and MS Short Straight Sections.

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  1. Field quality of the DS and MS Short Straight Sections. S. Sanfilippo, M.Calvi, E.Todesco and W. Venturini. • Status of the cold measurements in SM18. • Proposal for 2006 : 6XX series and 5XX series. • Multipoles measurements on DS/MS Quadrupoles (W.Venturini),

  2. 6XX magnetic measurements strategy for 2006. • Measurements outside SM18: • At room temperature with QIMM (ACCEL, TESLA,CERN) • At cold in Block 4 with long rotating coil for multipoles (MQMC, MQM,MQY). Correlation:Warm Cold Block 4 • Measurements in SM18 • MQY not measured in block 4 (Gdl for all) +few MQY already measured in block 4 (re-scale the abs.value of TF and checks of bn) • Gdl measurements on MQML to refine the w/c. • Relative variation with current for injection value and statistics for the spread, both measured in Block 4. • Magnets selected following the priority optics (input from AB/BP). Correlation:Warm Cold SM18+ cold data for MQY.

  3. Magnetic measurements executed in the SM18. 18 magnetically measured / 46 magnets cold tested (March 2006). • Critical SSS (optic point of view) did not came first (but we had to validate the prod. Lines). • Gdl measurements in priority on MQML (not measured in block 4) • Magnetic measurements coupled with geometry (shape) and axis measurements.

  4. Overview of limitations for S4 magnetic measurement in SM18 Mechanics • Magnet preparation outside bench: anti-cryostat, MRB alignment… (1 day) • Alignment in the test bench (1/2 day). • Installation and removal of rotating coils, chaconsa : only by mechanics, not given to ICS. Operations done by MTM mechanics team, working in normal hours. Limitation in the devices for magnetic measurements. • Scanner : -Can be installed on all types, provides harmonics, GdL, axis (no FD) - But very time-consuming (~1 week/campaign) • Rotating coils : - Cannot be installed on long cold mass types (Q6 IR 2,3,7,8 + Q4 IR2,8 + Q5 2/8) - Total coil length = 4750 m (shorter than MQML) - 2 test benches suitable for rotating coil measurements (TBB1, TBD1). • SSW : - Reference value for Gdl at nominal and for magnetic axis measurements. - Gdl: difficult at arc & IR quad injection. Measurements /analysis. • Preparation (config, settings..) : not fully automatised done by experts. • Measurements : - SSW done by OP team but delicate. Frequent interventions of experts. - Scanner and rotating coils : OP not trained, done by experts. • Checks and data reduction : delicate, only done by experts.

  5. Proposal for Magnetic measurements (6XX). • Changes with respect to the proposal of January 2005 : • SSS635 (Q5R4) and SSS636 (Q6R4) in place of SSS646 (Q5L5) and SSS669 (Q6L2). • SSS660 : Gdl+ multipoles, SSS648 (only Gdl).

  6. Proposal for Magnetic measurements (5XX). Strategy : Use the warm to cold correlation of the arc SSS for MQ’s. Done • Transfer function (MQ, MQTL): 5 special SSS selected. • Multipoles of MQTL measured at cold in block 4. But no cold mass measurements performed at warm…..

  7. Transfer function of MQ’s (arc) . Cold mass /1.9 K Collared coil/1.9 K SSS507 /I Gdl/ I Gdl/ I Gdl/ I Gdl/ I No need of cold-mass measurements at 300 K for the 5XX series (memorandum MAS/MTM from 22th March 2006).

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