Present status and performance of LHC triplets MSCTM

Triplet layout Eight triplet magnets (Q 1, Q 2, Q 3) in LHC They

Training quench on MQX magnets on test bench in KEK or FNAL Training performance

Training quench on MQX magnets in LHC No additional training on magnets after shipment,

MCBX correctors IP Cross section of a MCBX magnet MCBXH and MCBXV are nested

Training quench on MCBX in bloc 4 Individual powering Most of the training were

RCBX performance in R 1 As MCBX magnets are not used more than 250

Status on spare magnets Q 1 : HCLQXA_001 -FL 000008 • • Ø Ø

Status on spare Magnets MQXA : § HCMQXA_001 -FL 000011 : in MTF but

Conclusion Quench performance of the present triplet in the LHC (main quadrupole and correctors)

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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

RCBX performance in L 2 12