Dispersion Matched Steering and Alignment Model in Main Linac

Slides:



Advertisements
Similar presentations
Update on ILC ML Lattice Design Alexander Valishev, for the FNAL LET group FNAL AP Dept. Meeting March 7, 2007.
Advertisements

Emittance dilution due to misalignment of quads and cavities of ILC main linac revised K.Kubo For beam energy 250 GeV,
Emittance dilution due to misalignment of quads and cavities of ILC main linac K.Kubo For beam energy 250 GeV, TESLA-type optics for 24MV/m.
Issues in ILC Main Linac and Bunch Compressor from Beam dynamics N. Solyak, A. Latina, K.Kubo.
Main Linac Simulation - Main Linac Alignment Tolerances - From single bunch effect ILC-MDIR Workshop Kiyoshi KUBO References: TESLA TDR ILC-TRC-2.
Author - Title (Footer)1 LINEAR LATTICE ERRORS AT THE ESRF: MODELING AND CORRECTION A. Franchi, L. Farvacque, T. Perron.
1 ILC Main Linac Alignment Simulations using Conventional Techniques and Development of Alignment Model John Dale LCWS08 & ILC08.
Update on ILC ML Lattice Design Alexander Valishev, for the FNAL LET group FNAL AP Dept. Meeting March 7, 2007.
Alignment and Beam Stability
Simulation of Positron Production and Capturing. W. Gai, W. Liu, H. Wang and K. Kim Working with SLAC & DESY.
DESY GDE Meeting Global Design Effort 1 / 12 Status of RTML Design and Tuning Studies PT SLAC.
CERN, BE-ABP-CC3 Jürgen Pfingstner Verification of the Design of the Beam-based Controller Jürgen Pfingstner 2. June 2009.
ILC BDS Static Beam-Based Alignment and Tuning Glen White SLAC 1.Aims. 2.Error parameters and other assumptions. 3.Overview of alignment and tuning procedure.
Alignment (Survey) Tolerances in Main Linac from Beam Dynamics Simulations Kiyoshi Kubo.
Jan Euro-TeV meeting 1 Integrated Simulation of DFS Paul Lebrun Fermilab CD/AMR.
Status of Reference Network Simulations John Dale TILC09 20 April 2009.
July 19-22, 2006, Vancouver KIRTI RANJAN1 ILC Curved Linac Simulation Kirti Ranjan, Francois Ostiguy, Nikolay Solyak Fermilab + Peter Tenenbaum (PT) SLAC.
Vertical Emittance Tuning at the Australian Synchrotron Light Source Rohan Dowd Presented by Eugene Tan.
Analysis of Multipole and Position Tolerances for the ATF2 Final Focus Line James Jones ASTeC, Daresbury Laboratory.
ILC Main Linac Alignment Simulations John Dale 2009 Linear Collider Workshop of the Americas.
CLIC Beam Physics Working Group CLIC pre-alignment simulations Thomas Touzé BE/ABP-SU Update on the simulations of the CLIC pre-alignment.
Placet based DFS simulations in the ILC Main Linac. Some preliminary results of error scans open for discussion Javier Resta Lopez JAI, Oxford University.
Status of Reference Network Simulations John Dale ILC-CLIC LET Beam Dynamics Workshop 23 June 2009.
J. Pfingstner Imperfections tolerances for on-line DFS Improved imperfection tolerances for an on-line dispersion free steering algorithm Jürgen Pfingstner.
Kiyoshi Kubo Electron beam in undulators of e+ source - Emittance and orbit angle with quad misalignment and corrections - Effect of beam pipe.
Emittance Tuning Simulations in the ILC Damping Rings James Jones ASTeC, Daresbury Laboratory.
1 DFS Studies on the Main Linac with Rnd-walk-like motion (preliminary) Accelerator Physics Meeting 02 october 2007 Freddy Poirier.
1 DFS Studies on the Main Linac with Rnd-walk-like motion LET Beam Dynamics Workshop 12 th December 2007 Freddy Poirier.
DMS steering with BPM scale error - Trial of a New Optics - Kiyoshi Kubo
Main Linac Tolerances What do they mean? ILC-GDE meeting Beijing Kiyoshi Kubo 1.Introduction, review of old studies 2.Assumed “static” errors.
Isabell-A. Melzer-Pellmann LET Beam Dynamics Workshop, Lumi scans with wakefields in Merlin Lumi scans with wakefields in Merlin Isabell-A.
Simulations - Beam dynamics in low emittance transport (LET: From the exit of Damping Ring) K. Kubo
April Recent work on Low Emittance Transport, Main Linac Paul Lebrun CD/FNAL.
DRAFT: What have been done and what to do in ILC-LET beam dynamics Beam dynamics/Simulations Group Beijing.
Freddy Poirier ILC project Meeting Integrated Luminosity Performance Study on the ILC – WP6 (A snapshot of the European LC workshop at Daresbury) Freddy.
Freddy Poirier - DESY Preliminary Merlin DFS studies following discussion (Very preliminary) Freddy Poirier DESY.
8 th February 2006 Freddy Poirier ILC-LET workshop 1 Freddy Poirier DESY ILC-LET Workshop Dispersion Free Steering in the ILC using MERLIN.
Review of Alignment Tolerances for LCLS-II SC Linac Arun Saini, N. Solyak Fermilab 27 th April 2016, LCLS-II Accelerator Physics Meeting.
ILC Main Linac Beam Dynamics Review K. Kubo.
Effects of Accelerating Cavities on On-Line Dispersion Free Steering in the Main Linac of CLIC Effects of Accelerating Cavities on On-Line Dispersion Free.
From Beam Dynamics K. Kubo
Arun Saini, N. Solyak Fermi National Accelerator Laboratory
ILC BDS Alignment, Tuning and Feedback Studies
Correlated Misalignments Studies for LCLS-II SC Linac
Positron capture section studies for CLIC Hybrid source - baseline
Tolerances & Tuning of the ATF2 Final Focus Line
Workshop on Tau-Charm at High Luminosity
Benchmarking MAD, SAD and PLACET Characterization and performance of the CLIC Beam Delivery System with MAD, SAD and PLACET T. Asaka† and J. Resta López‡
For Discussion Possible Beam Dynamics Issues in ILC downstream of Damping Ring LCWS2015 K. Kubo.
Emittance Dilution and Preservation in the ILC RTML
Beam Dynamics in Curved ILC Main Linac (following earth curvature)
ILC Z-pole Calibration Runs Main Linac performance
Update on ILC ML Lattice Design
A simple model of the ILC alignment process for use in LET simulations
Wake field limitations in a low gradient main linac of CLIC
Low Emittance Tuning Tests at the Diamond Light Source (Rutherford Labs) Dec R. Bartolini, S. Liuzzo, P. Raimondi SuperB XV Meeting Caltech, CA,
New algorithms for tuning the CLIC beam delivery system
Summary of Beam Dynamics Working Group
Adaptive Alignment & Ground Motion
Optimization of Triplet Field Quality in Collision
Accelerator Physics Technical System Group Review
Status of Reference Network Simulations
SuperB e+/e- main linac and diagnostics studies
ILC Main Linac Alignment Simulations
Slope measurements from test-beam irradiations
Motivation Technique Simulations LCLS LCLS DOE Review, April 24, 2002
Start-to-End Simulations for the TESLA LC
Linac Design Update P. Emma LCLS DOE Review May 11, 2005 LCLS.
Linear beam dynamics simulations for XFEL beam distribution system
Yuri Nosochkov Yunhai Cai, Fanglei Lin, Vasiliy Morozov
Presentation transcript:

Dispersion Matched Steering and Alignment Model in Main Linac Freddy poirier Dispersion Matched Steering and Alignment Model in Main Linac EUROTeV meeting 26/08/08 Freddy Poirier

Simulation of Dispersion Matched Steering (DMS) Freddy poirier Simulation of Dispersion Matched Steering (DMS) Present Simulations are using Merlin (a C++ based library for particle tracking) The Merlin based ILCDFS package Is performing the tracking throught the curved main linac (positron side) It has implementation of the Beam Based Alignment: Dispersion Matched Steering correction# Dispersion Matched Steering (DMS) DMS attempts to locally correct dispersion which arises from magnets and other accelerators components alignment errors. Steerers (here correctors) are set to minimize dispersion and thus preserve the emittance along the Main Linac (ML) This technique uses: A nominal beam (15 GeV at beg. of ML to 250 GeV at exit) One (or more) test-beam with off-energy beam (different energy from nominal) #Due to non-zero design dispersion (curved linac) which must be match, the more general algorithm applied is here DMS rather than DFS (Free)

ILCDFS package C++ class diagram Freddy poirier ILCDFS package C++ class diagram DFSApp is the core class coordinating other classes (errors, beam dynamics model, energy strategy,…) Particle tracking, SMPT, Ray tracing An ILC main linac simulation package based on MERLIN EUROTeV Report 2006-076 Coordination, iteration Segment boundaries The package has been used for various work: - Benchmark(1) with other codes (i.e. placet). - Ground Motion errors studies (3) Global Correction (2) Component tolerances, coupling corrections, … It includes a class to read offsets from a survey line simulation (1) Study of an ILC Main Linac that follows the Earth Curvature EUROTeV Report 2006-50 (2) Evaluation of Component tolerances for the ILC main linac assuming global corrections, EUROTeV Report 2007-20 (3) Simulation Studies of Correlated misalignments in the ILC main linac and influence of ground motion, EUROTeV Report 2008-17

DMS - energy strategy study Freddy poirier DMS - energy strategy study Study of energy adjustment strategy for off-energy beam along linac with the Merlin based code ILCDFS 1) IB: Initial energy is the most effective single adjustment. (geyc=22.8 nm) 2) CG: Constant gradient only least effective (59.3 nm)(*) 3) Combination of IB and CG helps to obtain better results (22.5 nm) 4) KS: Klystron Shunting (30.2 nm). Steps probably an artefact of simu. due to steering effect. Decrease with energy This Energy Adjustment Strategy is used in the next study on the alignment. *CG do not effectively correct dispersion at the beginning as relative uncorrelated energy spread is highest. See: Energy Adjustment Strategy for DFS at the ILC using the MERLIN Package ILCDFS – EUROTeV report 2006-106 Mean over 100 random machine (uncorrelated static errors)

Freddy poirier Purpose of Alignment Simulation (courtesy of A. Reichold – Oxford Uni.) Solve two long standing problems: LET simulation studies have to date used models of alignment that were not fully comparable to any potential survey and alignment process that may once be used in the ILC  we may have missed some problems that alignments may cause for LET The parameters describing these models could not be translated into requirements for survey processes  we have not determined which survey and alignment processes do or don’t satisfy the ILC-LET requirements We don’t have a real world alignment model for ILC!

Purpose (courtesy of A. Reichold – Oxford Uni.) Freddy poirier Purpose (courtesy of A. Reichold – Oxford Uni.) Bootstrap a real optimisation loop between LET simulations and the development of new survey and alignment techniques LET Simulation misaligned accelerator accept/reject or classify parameter ranges simplified survey model random walk parameters Real World Survey Simulation

Real Survey & Alignment Processes Freddy poirier Real Survey & Alignment Processes Survey and alignment for the ILC will consist of many techniques using many different measurements We don’t know the entire chain yet we know candidates for the linear tunnel reference survey (i.e. LiCAS) we know candidates for the site wide reference network O(km)  differential GPS

Survey Model A simplified alignment model has been proposed Freddy poirier Survey Model A simplified alignment model has been proposed For the tunnel reference survey based on a pseudo-random walk Using the wide reference network (primary points) to correct the reference survey. Components of the linac are then positioned according to the adjusted offsets of the survey line

The present model Random walk (y) parameterized as: Freddy poirier The present model Random walk (y) parameterized as: Errors (stat. and sys.): Correction (yc): ay aq aq and ay are random Gaussian errors (angle and offset) qsyst and ysyst are the systematic errors Error weighted average fit (parabolic)

A Simulated example of Survey Freddy poirier A Simulated example of Survey Yp= offsets of primary points (wide reference network) 2.5 km apart (shaft?) Y=offset of the reference survey Random walk Yc=corrected offset of the survey line parabola correction (weighted solution) y yc yp Yp(first)=0 (fixed) The starting angle of the offset at the beginning of a primary section is the same as the last one from a previous section Done with scilab: a mathematical tool

DMS & Alignment Simulation Freddy poirier DMS & Alignment Simulation Initial parameters (thought to be achievable with survey technique such as LICAS): ay= 5 106 m aq= 55.4 10-9 rad Dq= 260 10-9 rad Dy= 5.3 10-6 m syp= 2.0 10-3 m (error on primary points) Weight (DMS)= fixed! (=40) The sensitivity of the emittance at the end of the linac to the parameters of the model is rather low except for the primary points error (*). Injection emittance = 20 nm, mean over 100 random generated machine The model here only uses the correction as given in the version 0.7 of the misalignment paper. Emittance (or eyc) here is the vertical emittance with the energy correlation numerically removed * Though still lower than independent error on components.

Freddy poirier Conclusion Emittance growth with standard uncorrelated errors = ~2.4 nm Emittance growth (alignment model + std errors)=~2.4 nm Impact on the emittance growth of the alignment model with (initial) parameters thought to be achievable with survey techniques: Negligible

Freddy poirier Note Traditionally (2007 ILC-GDE meeting) the alignment errors used are 200 mm/ 600m of linac length. With the initial parameters used here, the errors obtained from the monte-carlo alignment model are of ~100 mm/ 600m (This includes the correction scheme)

Freddy poirier Outlook A first loop has been done here to use a simplified model characteristic of an alignment process. This study is part of an on-going discussion between beam dynamics group and ILC metrology group. I would like to thank E. Elsen, K.Kubo, A. Reichold for discussions