LCWS2015 : Beam Dynamics / M. Woodley Lattice Design Update for RTML, ML, and BDS Tuesday, November 3, 2015, 11:35 AM, 25 minutes 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley Overview the most recent “official” release of ILC lattice description files (MAD8 Extended Standard Input Format files), corresponding to the TDR, was made at ALCWS-2015 in April and designated “ILC2015a” https://bitbucket.org/whitegr/ilc-lattices goals of present work: implement Change Request #2 (CR02) … single 4.1 m L* for both detectors merge ILC2015a FF design with T. Okugi design … FF length increased by 11.64 m include separate low and high energy COL and FF definition files ilc661.pcolle.xsif, ilc671.pffle.xsif (ECM < 600 GeV) ilc661.pcolhe.xsif, ilc671.pffhe.xsif (ECM > 600 GeV) includes Change Request #6 (CR06) … IP BPM see discussion at BDS/MDI session on Thursday fix error in laser wire chicane length in BSYs … maintain identical e- and e+ systems BSY length decreased by 23.87 m photon path length (undulator exit to target) decreased by 12.23 m implement Change Request #4 (CR04) … extension of Main Linac tunnels to correct global e-/e+ timing pLET system (pDR → IP) length increased by 2965.609 m (after changes mentioned above) part of length increase in pLTL, part between pBC2 and pML, the rest at the end of pML (before pMPSCOL) path length difference (e-/e+) set to 10 x CDR FF offset got 28.5453 mm bigger (old: 1.6652 m; new: 1.6938 m) 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley LTL to turnaround match LTL FODO cells DR extraction turnaround BC2 to Main Linac match Return Line Main Linac Main Linac extension IP 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley e+ system changes for CR04 pLTL add 20 “RETURNCELLC” FODO cells after MARKer “M_8_cell_end” did NOT change FODO cell length (still 72.493 m cell length) add 32.939 m to “RTMATCH” beamline just upstream of turnaround rematch return line to turnaround pBC2 add 88.5 m to “BC2_ML_2” beamline (matching between pBC2 and pML) rematch pBC2 to pML pML inserted space for an additional complete 12-string (36 ML unit) cryo unit … details to follow pBSY shorten laserwire chicane from 76.9 m to 42.6 m shorten center drift from 11.5 m to 5.0 m replace eight (8) quadrupoles used to match to FF through polarimeter chicane old: length = 3 m, bore = 80 mm new: length = 2 m, bore = 12 mm rematch BSY to FF through polarimeter 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley LTL turnaround LTL FODO cells 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley LTL turnaround RTMATCH 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley kickers BC2 Main Linac BC2_ML_2 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley BC2_ML_2 BC2 e+ Main Linac LW chicane BC2 dump line septa kickers 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley Main Linac BSY DUNIT1 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley positron Main Linac extended at downstream end (before MPS collimation) inserted space for an additional complete 12-string (36 ML unit) cryo unit include space for end boxes, service boxes, and warm drifts same quadrupole center-to-center spacing as Main Linac same cryo unit-to-unit spacing as Main Linac replace cryogenic quadrupoles with BDS “Q75L2000” magnets core length = 2 m, bore = 75 mm maintain Main Linac optics (β-functions) no additional cryomodules included (drifts, quads, BPMs, XCORs, and YCORs only) if populated with cryomodules, would provide an additional ~30 GeV of acceleration 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

From “TDR lattice (2015a) review and status” (ALCW-2015) https://agenda.linearcollider.org/event/6557/session/7/contribution/77/material/slides/1.pdf Recreating the TDR CFS geometry subsystems comments EBSY1 / EBSY2 PBSY1 / PBSY2 Redefinition errors discovered during “deck integration”: polarimeter chicanes were copied from *BSY2 to *BSY1 as separate laserwire detection chicanes names of elements (bends and drifts) were not changed names of parameters that defined bend and drift lengths were not changed values of parameters that defined bend and drift lengths were changed in *BSY1 files when *BSY1 file is loaded, LW chicane is 45.1 m long when *BSY2 file is loaded, LW chicane is redefined to be 76.9 m long (ΔL = 31.8 m) TDR CFS coordinates include BSY LW chicanes that are each 31.8 m too long PBDS was 0.95 m shorter than EBDS due to rematching between PBSY and PFFS, so: shorten PMPSCOL by 0.95 m and rematch modify PBSY2 such that EBDS and PBDS are now identical redefine TDR CFS coordinates for TPML2BDS Treaty Point (e+) to be symmetric w.r.t. IP with TPS2EBDS treaty point (e-) 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley MPS collimation FF kickers 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

From “Report of Global Timing Working Group” EDMS number: D00000001097725 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

From T. Okugi’s presentation at POSIPOL2015 ΔS = ±340 mm From T. Okugi’s presentation at POSIPOL2015 https://eventbooking.stfc.ac.uk/uploads/posipol/posipolokugi20150902.pdf 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

From “SB2009 Proposal Document” https://ilc-edmsdirect.desy.de/ilc-edmsdirect/file.jsp?edmsid=D00000000900425 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley Ongoing Work / Issues MAD8 SURVEY tape-file output precision (10 digit) is too small for total LET (length > 32 km) … need to use sum(Li) for μ-level precision! path length between kickers and septa in DR (127 μm + 32 μm = 159 μm error) still need to make identical modifications to electron systems space for 12-string (36 ML unit) cryo unit in eML FODO cells in eLTL add path length adjustment chicane in e+ source system? Okugi-san’s chicane after booster linac (smaller emittance … easier magnets) move e+ booster linac? new e+ energy compressor? warm spin rotator solenoids? BSY laserwire chicane offset large enough for laserwire photon detection? present design “inherited” (post-SB2009) old (polarimeter) chicane offset was 20 mm … offset now is 8 mm should we change pBSY dump line to simple DC tuneup line (with reduced bandwidth)? need to fix earth’s curvature following and vertical dispersion compensation after changes coordinate system IP no longer at origin of coordinate system (X = -28.631 mm) … shift coordinates? is our Cartesian system appropriate for a machine that follows the earth’s curvature? finalize ILC2015b release merge repository into EDMS and document 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley Conclusions and Outlook unfortunately, ILC2015b MAD deck release is not ready yet need to apply positron system modifications to electron systems BSY issues/questions positron path length correction chicane coordinate system / Treaty Points still hoping to finish in 2015! e+/e- path lengths now differ by exactly 10 x CDR (within 1 μm) there are sub-millimeter path length errors in DR Injection/Extraction layout to fix all changes (such as they are) will be available from the Lattice Repository (from the “dev” branch) ILC2015b to be next release 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley End Thanks! 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley ILC2015b: e+ Treaty Points Actual MAD8 SURVEY output: UPT (undulator end to e+ production target) pSource (e + production target to DR injection septa) pLET (DR extraction septa to post-IP dump) 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley e+ Treaty Point Coordinates Treaty Point Description S X Y Z Yaw m rad TEUND2PTGT end of e- undulator 0.000000 21.873849 -2664.806001 -0.007000 TPTGT e+ production target 359.814810 19.355645 -2305.000000 TPTGT2CAP start of e+ capture 377.789910 19.229821 -2287.025340 TPCAP2PPA start of e+ pre-acceleration 469.293799 18.590086 -2195.636160 TPPA2TRANL start of e+ low energy transport 517.900307 18.249843 -2147.030843 TPTRANL2BSTR start of e+ booster linac 929.500307 15.368667 -1735.440927 TPBSTR2TRANH start of e+ high energy transport 1302.058685 12.760779 -1362.891677 TPTRANH2LTR start of e+ LTR 2236.287965 6.221228 -428.685285 TPS2DR pSource/pDR interface 2568.520812 94.410000 0.350000 -112.103000 0.240001 TPDRISEPT end of pDR injection septa 2602.451206 99.915998 -78.707370 -0.000002 TPDRINJ end of pDR injection kicker chain 2661.051206 100.000000 -20.107370 TPDR center of pDR Inj/Ext straight 2681.158576 TPDREXT start of pDR extraction kicker chain 15.192630 TPDRXSEPT start of pDR extraction septa 73.592630 99.958001 -0.000001 TPDR2RTML pDR/pRTML interface 107.530061 106.988000 -0.240000 TPRTL2LTL start of e+ getaway 409.336762 4.423948 1.650000 393.372529 0.007000 TPLTL2TURN start of e+ turnaround 16046.273210 116.081475 16029.899020 TPTURN2SPIN start of e+ spin rotation 16321.173210 109.166598 16068.084360 -3.273026 TPSPIN2BC1 start of e+ bunch compressor #1 16444.294000 113.283819 15945.255160 -3.134593 TPBC12BC2 start of e+ bunch compressor #2 16675.138770 111.669184 15714.601530 TPRTML2ML start of e+ Main Linac 17671.532070 104.694685 14718.260350 TPML2MPSCOL start of e+ MPS collimation 30067.452070 17.923953 2322.644044 TPML2BDS pML/pBDS interface 30148.863580 17.354077 2241.234531 TPBDS2FF end of e+ BSY; start of e+ FF 30796.206570 12.822714 1593.907418 TPIP Interaction Point 32390.166570 -0.028631 NOT CORRECT 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley e+ Treaty Point Twiss parameters Treaty Point Description X Y β α η η’ m TEUND2PTGT end of e- undulator 63.508534 -0.000001 0.000000 36.626566 0.000018 TPTGT2CAP start of e+ capture 1.667821 TPCAP2PPA start of e+ pre-acceleration TPPA2TRANL start of e+ low energy transport 5.009221 0.455210 28.195546 -2.407300 TPTRANL2BSTR start of e+ booster linac TPBSTR2TRANH start of e+ high energy transport 38.938852 -1.068935 1.068935 TPTRANH2LTR start of e+ LTR 9.750866 -3.306658 16.710181 1.848814 TPS2DR pSource/pDR interface 7.886916 1.052761 9.476504 -1.239600 TPDRISEPT start of pDR injection septa 70.022514 -0.017843 0.004004 0.000148 6.330782 -0.205809 TPDRINJ end of pDR injection kicker chain 70.972329 -0.117871 17.279650 -1.358325 TPDR center of pDR Inj/Ext straight 19.224365 -0.135472 73.462831 -0.034869 TPDREXT start of pDR extraction kicker chain 70.926197 0.115013 -0.000060 0.000001 16.743229 1.325399 TPDRXSEPT end of pDR extraction septa 70.022063 0.017843 0.041848 -0.001534 6.330940 0.205799 TPDR2RTML pDR/pRTML interface 11.931984 0.430958 14.839667 1.546689 TPRTL2LTL start of e+ “getaway” 1.655533 0.525789 8.822188 -2.503966 TPLTL2TURN start of e+ turnaround 10.944657 3.039304 1.259470 -0.425128 TPTURN2SPIN start of e+ spin rotation 6.704446 0.633287 6.963221 0.889879 TPSPIN2BC1 start of e+ bunch compressor #1 3.399946 -1.087918 3.764517 1.190676 TPBC12BC2 start of e+ bunch compressor #2 78.359911 2.329598 9.543245 -0.733813 TPRTML2ML start of e+ Main Linac 60.495848 -1.097760 79.077841 1.270972 TPML2MPSCOL start of e+ MPS collimation 72.467322 -1.543842 36.223728 1.105583 TPML2BDS pML/pBDS interface 51.329718 -2.401757 9.395846 0.488830 TPBDS2FF start of e+ Final Focus 19.902978 -0.000006 23.515080 TPIP Interaction Point NOT UPDATED 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley ILC2015b: Lattice Repository 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley https://bitbucket.org/whitegr/ilc-lattices downloads no account (user ID, password) required to download 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley https://bitbucket.org/whitegr/ilc-lattices/downloads download the main branch (complete set of ILC MAD input files) 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley

LCWS2015 : Beam Dynamics / M. Woodley Software Management of ILC Lattice Repository Repository (GIT) branches with access control and actions governed by branch type. Master repository hosted at Bitbucket site, with documentation etc. on co-hosted wiki. User base and privileges managed by master repository web site. Master branch World read access Write access by “repository manager” only Should correspond to currently accepted ILC “baseline” designs Only merge-able with “release candidate” or “hotfix” branches Hotfix & Release Candidate Branches Read/write access only by “core development team” or users designated by these Apply fixes or prepare releases, including applying unit test procedures to ensure e.g. Twiss parameters correct and representative beams track to give conditions specified in interface documents. Final merge done with master branch by “repository manager” and tagged with a release code and changes fully documented and checked with EDMS document procedures etc. Development branch read/write by “core development team” and invited users (including CR branch managers) Change Request Branch Generated by “repository manager” for approved change requests and control handed over to required users as designated by the ILC CR process. Merges in to development branch upon completion and sign-off of CR process. Feature Addition Branch As above, but generated and controlled for management purposes by “core development team”. R2015a R2015b R2016a CR-i CR-j 11/3/2015 LCWS2015 : Beam Dynamics / M. Woodley