Present status and performance of LHC triplets MSCTM












- Slides: 12

Present status and performance of LHC triplets MSC-TM, 20/06/2017 S. Le Naour

Triplet layout Eight triplet magnets (Q 1, Q 2, Q 3) in LHC They were designed and manufactured by KEK (Japon) and Fermilab (USA) Q 3 MQXA (8 k. A) DFBX MCBXH/V, MQSX (600 A) MCSX, MCSSX, MCOSX, MCTX (80, 120 A) Q 2 2 MQXB (13 k. A) MCBXH/V (± 600 A) Q 1 MQXA (8 k. A ± 600 A) MCBXH/V (± 600 A) ~35 m IP (Atlas, CMS, Alice, LHCb) Powering of the main magnets (MQX) 2

Training quench on MQX magnets on test bench in KEK or FNAL Training performance found in quench database, with little or no info Ø 2 additional MQXA cold masses at CERN (n° 11 & 20) § 20 quenches to train MQXA_11 § No info at all on MQXA_20 ! 3

Training quench on MQX magnets in LHC No additional training on magnets after shipment, first tests in LHC § No quench recorded in 2008 (4180 A in Q 1/Q 3; 11630 A in Q 2) Presentation in MSC-TM, 29/10/15 Few (5) additional quenches due to perturbations (thunderstorm, kicker…) in Run 2 No quench during e. YETS 2016/17 HWC

MCBX correctors IP Cross section of a MCBX magnet MCBXH and MCBXV are nested Ø 600 A 400 A Powering tests in LHC Individual powering RCBXH RCBXV Combined powering 200 A 20 min 5

Training quench on MCBX in bloc 4 Individual powering Most of the training were performed at 4. 3 K, tentatively up to 700 A. In LHC, 35 MCBX magnets/48 quenched at least once below 550 A. 6

RCBX performance in R 1 As MCBX magnets are not used more than 250 A in operation, the nominal current was reduced to 410 A 7

Status on spare magnets Q 1 : HCLQXA_001 -FL 000008 • • Ø Ø HCMQXA_001 -FL 000009 HCMCBX_001 -SP 000011 Acceptance test OK, cold test OK, no major NCR, attached to LQXAB. 1 L 5 in Aug 06 and detached in Sept 07. Possibly, on SM 18 test bench before end 2017. BS in place no magnetic measurement possible (done in Fermilab) Q 2 : HCLQXB_001 -FL 000001 • • • Ø HCMQXB_001 -FL 000002 HCMQXB_001 -FL 000001 HCMCBX_001 -SP 000015 ? Acceptance test OK, except strip heater YT 1142 found open (NCR 555602), cold test OK Q 3 : HCLQXC_001 -FL 000009 • • Ø HCMQXA_001 -FL 000019 HCMCBXA 001 -CR 000008 HCMCSOX? HCMQSX_001 -02000003 Report on acceptance test missing, cold test OK 8

Status on spare Magnets MQXA : § HCMQXA_001 -FL 000011 : in MTF but empty, very long training on this cold mass § HCMQXA_001 -FL 000020 at CERN, but no MTF, no electrical test, no cold test…. MCBXA : (MCBX assembly for Q 3) § HCMCBXA 001 -CR 00033 ; no cold test MCBX : § HCMCBX_001 -SP 00032 ; MTF OK, cold test OK § HCMCBX_001 -SP 00035 ; MTF OK, cold test OK, no combined powering MQSX : where are there? No cold test § HCMQSX_001 -02000009 § HCMQSX_001 -02000010 § HCMQSX_001 -02000011 9

Conclusion Quench performance of the present triplet in the LHC (main quadrupole and correctors) are good. Seems also OK for the spare magnet Q 1, Q 2 and Q 3. Ø Almost no information in MTF, concerning the spare magnets. Fortunately, ID cards looks complete with cold performance, geometric and magnetic data. Ø Cold tests in SM 18 are still planned, but not with high priority (so regularly postponed) Ø 10

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RCBX performance in L 2 12