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Measurements of Special SSS during production N. Catalan Lasheras

Measurements of Special SSS during production N. Catalan Lasheras Review of the Tests of Superconducting Magnets in SM18 14 January 2005. Layout of Special SSS Dashboard Measurements in factories Measurements in Bloc 4 Measurements of completed cold masses in 181 Problems with MQY

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Measurements of Special SSS during production N. Catalan Lasheras

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  1. Measurements of Special SSS during production N. Catalan Lasheras Review of the Tests of Superconducting Magnets in SM18 14 January 2005 • Layout of Special SSS • Dashboard • Measurements in factories • Measurements in Bloc 4 • Measurements of completed cold masses in 181 • Problems with MQY • Requirements for cold mass production

  2. Layout of Special SSS • Special SSS in the matching sections (MS) and dispersion suppressors (DS) • From Q4 to Q10 (Q11) in the lattice • There are 82 special SSS of MQM type (+ 32 of MQ/MQTL type) • 31 cold mass types in 46 cryostat types • Magnets are individually powered and tunable by aperture • Matching section magnets are is stand-alone cryostats at 4.5 K • Cold masses are assembled at CERN in 181 and cryostated in 904 • Classified by length and number of supports

  3. Dashboard • Three SSSS tested in 2004 (but need retesting - lack of 120 A DCF) • Average production rate is 1 cold mass per week • Assuming cryostating follows, 40 new SSSS to be tested in 2005 (+11 from 2004 + retest) • Installation of sector 7-8 foreseen for July 2005 (7+7 units) followed by sector 8-1 (7 units)

  4. Measurements in factories • Warm magnetic measurements done at Tesla (MQM) and ACCEL (MQY) for acceptance of individual magnets • Manual QIMM system used (MTM) • Transfer function, harmonics, Lmag, angle and axes • Reproducibility (according to available data): 0.1 unit when using the same mole • Measurements used to sort magnets whenever possible Position Position 1 Position 2 Position 3 Position 4 Integrales Cn (mT) 0.003465 0.005010 0.005012 0.002569 0.012040 Angle(Hor,Cn)-0.3551 -1.6854 0.890345 2.0881 -8.566136 b1 -7.2095E+1 2.6186E+0 4.5252E+1 3.8114E+0 -4.300083E-3 b2 1.0000E+4 1.0000E+4 1.0000E+4 1.0000E+4 1.000000E+4 b3 -3.5540E+0 -7.2239E-1 -1.6950E-1 -2.1586E+0 -1.783902E+0 b4 6.5234E-1 8.2320E-1 -4.3679E-3 -8.6476E-1 -2.578170E-1 b5 2.2593E-1 2.2235E-1 2.4203E-1 2.0765E-1 4.506600E-1 b6 1.5147E+1 1.9849E+0 1.3651E+0 7.2193E+0 5.469398E+0 b7 -1.2984E-1 -5.2724E-2 7.4807E-2 -2.8986E-1 -9.229790E-2 b8 3.8631E-2 1.2260E-1 6.8421E-2 3.9389E-2 -7.424144E-2 b9 -6.6120E-3 -1.7679E-2 -3.2482E-2 3.2836E-2 -1.079832E-2 b10 3.6768E-1 4.0248E-1 3.9164E-1 6.7406E-1 4.350598E-1 b11 -2.3022E-2 -1.3808E-2 -1.5428E-2 -5.2806E-2 -2.066003E-2 b12 6.5070E-2 8.2603E-2 6.6785E-2 5.3602E-2 -6.924371E-2 b13 -2.1604E-2 2.9042E-2 4.9475E-2 6.6433E-2 1.742100E-1 b14 3.8840E-1 5.0084E-1 4.9524E-1 4.2674E-1 4.629716E-1 b15 -3.7056E-3 7.0343E-3 3.1045E-3 3.3125E-3 -1.363824E-2 a1 7.2194E+1 5.9142E+1 2.8878E-1 -2.1320E+2 -5.242834E-3 a2 -7.1020E+0 -3.3709E+1 1.7806E+1 4.1762E+1 0.000000E+0 a3 -1.9020E+0 -2.2171E+0 -1.6057E+0 -1.1275E+0 1.390744E+0 a4 -1.5766E+0 -1.7091E+0 -2.7254E+0 -1.6204E+0 1.983593E+0 a5 -8.8159E-1 -5.8712E-2 -2.6178E-1 -1.0021E+0 2.268952E-1 a6 -8.5317E-1 1.6356E-1 2.3876E-1 2.6415E-2 -5.461886E-2 a7 -2.0480E-1 -7.7972E-2 -3.6716E-2 -7.6967E-2 6.751521E-2 a8 -9.0030E-2 -1.7536E-1 -2.1665E-1 -1.5196E-1 1.660998E-1 a9 -4.0097E-2 9.7951E-2 3.5441E-2 -1.3858E-1 -1.182650E-2 a10 2.0030E-1 -3.4329E-2 2.2934E-2 3.1125E-2 4.460877E-2 a11 -2.0685E-2 -1.2220E-2 -2.5259E-2 -2.8124E-2 2.254553E-2 a12 1.8944E-2 1.2814E-2 1.7353E-2 2.2805E-2 -1.714518E-2 a13 -1.0596E-1 -1.4674E-1 -1.9271E-1 -2.8368E-1 3.045370E-2 a14 -4.2634E-2 -2.3749E-2 1.1877E-2 3.0361E-2 -8.106328E-3 a15 -1.6638E-2 -8.5354E-3 -1.1887E-2 -2.2954E-2 -2.892621E-3 Temp taupe(deg) Niv init(mrad) Dx moy (mm) 1.2265E-4 0.0000E+0 -7.6930E-5 0.0000E+0 1.7596E-4 Dy moy (mm) -1.2264E-4 -1.0055E-4 0.0000E+0 3.6246E-4 -7.3532E-4 C2 centre (mT) 0.005011 Long. Mag. (m) 2.402825

  5. Measurements in Bloc 4 • Cold tests of individual magnets done in Bloc 4 in a vertical cryostat • Power tests done on 25 MQMC, MQM and MQY magnets (of 43 received) • Not possible for MQML magnets due to the cryostat length (qualification of two pre-series done in SM18) • Load line and body cold magnetic measurements only for a few quadrupoles • Preliminary warm-cold correlations to validate the use of WMM for checking AP requirements • Hysteresis and decay in the pre-series. Not extensive

  6. Measurements of completed cold masses in 181 • Measurements done on finished cold masses (no fiducialization) • Geometry and axis measured with the mole-laser tracker (verified by the measurements of the first Q9 in SM18 in December 2004) • Warm magnetic measurements on MQM, MQY,MCBC, MCBY with QIMM system (polarity, integral strength, harmonics, mechanical angle and relative magnetic axis) • Magnetic measurements confirm the assembly and reproduce factory data • Possibility of absolute magnetic axis and angle measurements with AC mole studied • Not possible for Q4, Q5 cold masses containing two MQY magnets (PS limited) Courtesy of N. Smirnov

  7. Problems with MQY • High transfer function from magnet MQY09 on • Warm magnetic measurements also show a drift in b6 multipole • Permeability of collars found to be outside specifications at low fields as for MQs (not observed in MQM production) • WMM are done at low current (3 A) due to QIMM PS limitations • Collared coil #23 (MQY12) assembled using high permeability collars

  8. Problems with MQY • If the problem is permeability it should disappear at high field • Verified in MQY12 in Bloc 4: b6 changes from -1.3 u at 3 A to +1.5 u at 2.5kA. Effect of permeability at 300 A (injection current) is about 0.1unit. • Creates large random errors in low order multipoles due to low fields • Prevents meaningful warm-cold correlations • About 40% of the production concerned (10 out of 26 magnets)

  9. Power tests of MQM, MQMC and MQY to continue in Bloc 4 at top rate. Cold magnetic measurements of MQY are necessary for sorting magnets in cold masses: All remaining MQY must be measured with integral coil (load line and harmonics). (New integral coil available in Bloc 4 from January 2005). Warm-cold correlation of MQM and MQMC to be confirmed in Bloc 4. Dynamic effects, cross-talk studies on a few MQM and MQY magnets in Bloc 4. Follow-up of production, warm-cold correlations (and dynamic effects) in MQML to be established in SM18. Cold masses already assembled and for which no reliable data is available should be measured in SM18 (SSS607 and 608 - Q48L, Q48R, …). Verification of CM shape at cold on a few units (1 per type). Requirements for cold mass production

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