Asynchronous free ATS optics for LHC & HL-LHC S. Fartoukh, BE-ABP

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Presentation transcript:

Asynchronous free ATS optics for LHC & HL-LHC S. Fartoukh, BE-ABP Reminder: the “birthmark” of the current ATS (HL-LHC) optics  Remedy  Status & Plans for production and LHC implementation 27/11/2015 S. Fartoukh for the LHC & HL Optics team

S. Fartoukh for the LHC & HL Optics team Reminder (1/2) ~p/2 phase advance between MKD and TCT.IR5b2  Clear MP issue for asynchronous dump (may be mitigable by opening the TCT and lose in b* reach, and tighten momentum interlock). Who wants to risk? R. Bruce @ LMC188, 03/09/2014 LMC recommendation (in the context of using ATS optics for Run II)  64h ATS MD were requested by G. Arduini & M. Giovannozzi (r)MPP recommendation (R. Bruce et al. @ LMC188), … a fortiori valid for HL-LHC A distance of at least +/- 40o wrt 90o should be granted between MKD and TCTs (b1/2, IR1/5) 27/11/2015 S. Fartoukh for the LHC & HL Optics team

S. Fartoukh for the LHC & HL Optics team Reminder (2/2) Phase advances for different (HL-)LHC optics versions: H phases from MKD to TCTs (Beam1/2, IR1/5) and H/V IP15 phases For the nominal LHC optics (Run I/II) these phases are changing (decreasing) with (low) b*. For ATS pre-squeezed optics, these phases do no longer move below a certain transition b* Phases[deg.] vs. Optics Run I (b*= 60 cm) Run II (b*= 80/40 cm) B1H: MKD-TCT-IR1 58.479 56.652/36.546 B1H: MKD-TCT-IR5 50.038 52.231/28.105 B2H: MKD-TCT-IR1 -158.760 -171.911/147.831 B2H: MKD-TCT-IR5 174.861 -166.502/153.242 B1H: IP1  IP5 IP5  IP1 -8.441 120.041 B2H: IP1  IP5 IP5 IP1 22.311 89.289 -5.410 117.009 B1V: IP1  IP5 -126.538 -118.262 B2V: IP1  IP5 -85.719 -159.081 ATS 2015 (pre-squeezed) HL-LHCV1.2 119.736 116.665 148.216 152.527 101.701 110.059 76.818 73.920 28.482 83.118 35.861 75.739 28.758 82.842 36.139 75.461 -14.536 129.736 -19.037 134.237 -14.264 129.464 -18.763 133.963 Both nominal optics are very similar with all TCT’s OK at 40 cm (note the change of IP15 H phase for beam2, from Run I to Run II, due to IR4/8 optics changes) Both ATS optics are very similar with all TCT’s (but one) NOK, in particular the most exposed TCT.R5b2 27/11/2015 S. Fartoukh for the LHC & HL Optics team

S. Fartoukh for the LHC & HL Optics team Solution (1/4) Dm (MKDTCT.R5b2) ~ 77o (pre-squezed)  90o (telescopic) Option 1: try to reduce this phase towards 0o, acting on the left side of IR6b2. Only a few degrees can be gained Option 2: re-deploy an ATS concept w/o p/2 arc cell phase in the ``strong’’ sectors s81/s12/s45/s56  Possible but a nightmare in terms of complexity (kind of mixture between “Phase-I-like” and ATS optics). Option 3: try to increase this phase towards 180o , acting on the left side of IR6b2.  .. and revive the very old (qualitative) picture of the “Verdier IR6 Potatoes”. 27/11/2015 S. Fartoukh for the LHC & HL Optics team

Solution (2/4) … since more than 15 years ! What’s about domains C and D with Dmx increased by p/2 ? All ATS optics till now (SLHCV3.xx, HLLHCV1.xx, ATS_MD2011/2012, ATS_2015, etc.) Dmx/y= 2.000/2.030 Phase I optics SLHCV1.0/2.0 Dmx/y= 2.01/1.90 Dmy= 0.25 Nominal optics (Run 0/I/II ..) Dmx/y= 2.015/1.78 … since more than 15 years ! Dmx= 0.25 Phase I optics SLHCV0.0 (unpublished) Dmx/y= 2.27/1.625 (limited by the empty cryostat aperture replacing Q7.L6) IR6 tuneability diagram (for old LHC-DS Layout) A. Verdier @ LHC-Project-Note 146 (1998) The different ``potatoes’’ are disconnected (i.e. the optics constraints should be relaxed to pass from one to the other due to the missing Q6 and Q7) 27/11/2015 S. Fartoukh for the LHC & HL Optics team

S. Fartoukh for the LHC & HL Optics team Solution (3/4) Beam1 Beam2 The +p/2 H-phase shift is Confined on the right The +p/2 H-phase shift is confined on the left 27/11/2015 S. Fartoukh for the LHC & HL Optics team

S. Fartoukh for the LHC & HL Optics team Solution (3/4) Beam2 phase [2p] along IR6: new vs. old Dmx ~ p/2 is confirmed on the left side of IP6 as needed in between TCT.R5b2 and MKD !.. 27/11/2015 S. Fartoukh for the LHC & HL Optics team

S. Fartoukh for the LHC & HL Optics team Solution (4/4) Phase advances for new ATS versions compared to nominal (Run I/II): V1: tunes re-matched with the ``weak’’ sectors (same QF/QD in s23/34/67/78), as proposed for the 3rd MD block, but leading to IP15 phases close to 0 in both planes for both beams V2: starting from V1, the IP15 phases of Run I are reproduced (different QF/D in s23/34/67/78 and non zero nominal RQTF/D in s23/34/67/78) Phases[deg.] vs. Optics Run I (b*= 60 cm) Run II (b*= 80/40 cm) B1H: MKD-TCT-IR1 58.479 56.652/36.546 B1H: MKD-TCT-IR5 50.038 52.231/28.105 B2H: MKD-TCT-IR1 -158.760 -171.911/147.831 B2H: MKD-TCT-IR5 174.861 -166.502/153.242 B1H: IP1  IP5 IP5  IP1 -8.441 120.041 B2H: IP1  IP5 IP5 IP1 22.311 89.289 -5.410 117.009 B1V: IP1  IP5 -126.538 -118.262 B2V: IP1  IP5 -85.719 -159.081 ATS new V1 (pre-squeezed) 164.546 164.228 148.759 148.801 -0.317 111.917 -0.0427 111.643 -5.536 120.736 -5.264 120.464 ATS new V2 (pre-squeezed) 171.729 163.289 171.604 149.293 -8.441 120.041 22.311 89.289 -126.538 -118.262 -85.719 -159.081 27/11/2015 S. Fartoukh for the LHC & HL Optics team

Status and Plans for production & implementation Telescopic squeeze to be re-done/re-checked for V2 Slight degradation of the phases expected w.r.t. presqueeze (<10 degrees) Otherwise, injection, ramp and pre-squeeze “virtually” ready for MD i.e. injection optics and pre-squeezed sequence to be assembled, with knobs (IP, Q, Q’, coupling, spools) and chromatic correction Aperture at injection may be to be re-checked/re-optimize in detail Thin lens version to be done to check loss map first on paper (DA will be checked in MD with Q’, MO, etc..) MD series to be prepared, posted and done before implementation in LHC. Long term development to be discussed (flat, high b* , high MO efficiency arc optics, …). 27/11/2015 S. Fartoukh for the LHC & HL Optics team