ATS optics new generation Status Plan S Fartoukh

ATS optics new generation: Status & Plan S. Fartoukh BE/ABP • Reminders • Optics readiness • Main validation steps in the pipeline • Conclusions 26/02/2015 S. Fartoukh, ATS Optics preparation and validation meeting 1

Reminders (1/3) ~p/2 phase advance between MKD and TCT. IR 5 b 2 (and other TCTs) Clear MP issue for asynchronous dump (see R. Bruce @ LMC 188, 2014) IR 6 beam 2 ATS optics: new vs. old Solution Jump onto a new IR 6 tune-ability range (see 61 st Hi. Lumi WP 2 meeting, 2015). 26/02/2015 S. Fartoukh, ATS Optics preparation and validation meetingshift + p/2 H-phase between MKD and TCT. R 5 b 2 2

Reminders (2/3) … A multitude of things to be improved w. r. t. the current nominal or ATS optics, and monitored for the telescopic optics (see also the LMC discussions on options min/med/max) - Dispersion at TCP 90% lower in IR 3 for ATS (historical), to be restored. New ATS compatible IR 4 optics (for BSRT as implemented in 2015 in the so-called option med). BI, ADT and LBDS functionalities preserved during the telescopic squeeze. New IR 2/8 crossing scheme (larger sep. , pitch of X-plane, etc. ). New IR 2/8 optics (phase) to maximize squeeze-ability in standard mode (ions, p. Pb) IP 15 phase preserved w. r. t. to 2015 optics. MKD-TCT phase for both beams, both IR 1 & IR 5, both for the pre-squeezed and telescopic squeezed optics. - 26/02/2015 … S. Fartoukh, ATS Optics preparation and validation meeting 3

Objective Reminders (3/3) Gain confidence, build experience and fully validate for the HL-LHC (when appropriate and still possible, feed-forward onto the HL-LHC present HW baseline) Strategy o Short-term (2016 -2017): 1. Re-build an optimized ATS LHC optics version, at least equivalent to the nominal optics in terms of b* reach and all other functionalities 2. Validate it on paper 3. Organize dedicated MDs and obtain asap the green light for implementation in the LHC in 2017 (see 2016 LSWG day) o Medium-term & by-products (2017 -2020): 1. Identify the most promising telescopic collision optics to boost the LHC performance 26/02/2015(flat or round telescopic S. Fartoukh, ATS Optics preparation and validation meeting angle, MO <0, and other tricks) 4 optics with reduced Xssing

Optics readiness (1/2) For the short term priorities (pre-squeezed optics) ü Done § § § Injection optics (b*=11/10/11/10 m, dz*= ± 2/3. 5/2/3. 5 mm, qc = ± 170 mrad) Pre-squeezed optics (b*=0. 4/10/3/0. 4 m, dz*= ± 0. 55/1. 0/0. 55/1. 0 mm, qc = ± 170/200/170/250 mrad) Pre-squeeze sequence for IR 1, IR 5 and IR 8 (optics and crossing knobs) ü On-going and to be done (by order of priority) § § IR 2 pre-squeeze sequence (222 T/m 205 T/m at cst b*=10 m, will be combined with the ramp) Functions for the lattice sextupoles. Standard knobs (Q, Q’, coupling, IP 15 phase and Q’’) and spool/MQT settings. IR 2 standard squeeze for ions (10 m 50 cm) 26/02/2015 S. Fartoukh, ATS Optics preparation and validation meeting 5

IR 8: pre-squeeze from b*=10 m to 3 m (1/2) • Optics Beam 1 26/02/2015 Beam 2 S. Fartoukh, ATS Optics preparation and validation meeting 6

IR 8: pre-squeeze from b*=10 m to 3 m (2/2) • Crossing bumps (spectrometer off, squeeze at cst Xangle of 500 mrad) 26/02/2015 Beam 1 Beam 2 S. Fartoukh, ATS Optics preparation and validation meeting 7

IR 1 & 5 : pre-squeeze from b*=11 m to 40 cm (1/2) • Optics Beam 1 26/02/2015 Beam 2 S. Fartoukh, ATS Optics preparation and validation meeting 8

IR 1 & 5 : pre-squeeze from b*=11 m to 40 cm (2/2) • Crossing bumps (squeeze at cst Xangle of 340 mrad) Beam 1 Beam 2 IR 1 V-crossing IR 5 H-crossing 26/02/2015 S. Fartoukh, ATS Optics preparation and validation meeting 9

MKD-TCT phase [deg. ] vs. b* for IR 1 MKD-TCT phase [deg. ] vs. b* for IR 5 Beam 1 @ TCTH. L 1 Beam 1 @ TCTH. L 5 Beam 2 @ TCTH. R 1 Beam 2 @ TCTH. R 5 b* [m] The worst case is still IR 5 -beam 2, but only at 30 degrees from the ideal case (the achromatic properties of ATS optics should preserve the situation for off-momentum asynchronous dumps). Even the injection optics looks good in IR 1/5, which also means that the detector is directly exposed 26/02/2015 10 (but a priori with larger aperture and larger normalized aperture than in the arcs, TBC…) S. Fartoukh, ATS Optics preparation and validation meeting

Optics readiness (2/2) For the telescopic optics ü Done § Telescopic round optics (b*=0. 1/10/0. 1/3 m) ü To be done (by order of priority) § Telescopic squeeze sequence type 4444 for IR 8/IR 2/IR 4/IR 8 (to cover 10 cm round optics for LHC, and 12 cm for HL-LHC) § Telescopic squeeze sequence type 2552 for IR 8/IR 2/IR 4/IR 8 (to cover 80/20 cm flat optics for LHC and 40/10 cm for HL-LHC) § ATS Knobs (Q, Q’, coupling, IP 15 phase and Q’’) and spool/MQT settings 26/02/2015 S. Fartoukh, ATS Optics preparation and validation meeting 11

Main validation steps o Basic checks (strength limits, aperture, chromatic properties, . . ) Done in parallel with the optics construction (the dry run will identify the last remaining mistakes. . ) o Machine protection & collimation 1. Injection failure No need to recheck 2. Asynchronous dumps, . . Hopefully OK (? ) see Roderick talks 3. Cleaning efficiency (new spikes) somebody is needed to validate o DA with (existing) field imperfections Shall be OK (what could be done otherwise !? . . . ) o Beam-beam see Tatiana’s talk 1. DA in collision (pre-squeezed optics) with Q’, MO, etc. , compared to nominal 2. Full ATS for LHC: X-angle reduction relying on LR beam-beam compensation with MOs 26/02/2015 correct-ability (Q 5/6 S. Fartoukh, Optics preparation and validation meeting 12 talk o Optics @ATS 40 cm, telescopic optics, . . ) see Rogelio’s

Conclusions … Quiet some interesting activities ahead to complete the work for the full ATS … To boost the validation and save MD time, one may already pass (by mistake) the ATS pre-squeeze settings for 2016 - 26/02/2015 S. Fartoukh, ATS Optics preparation and validation meeting 13