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Beam Physics Department. Yunhai Cai DOE Program Review, SLAC June 13, 2007. Professors: Alex Chao Ron Ruth Post-doctor: Yuantao Ding Students: Daniel Ratner Jerry Wang Administrative: Tom Knight Margie Bangali. Head: Yunhai Cai Staff: Gennady Stupakov Sam Heifets Karl Bane
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Bar Physics Department Yunhai Cai DOE Program Review, SLAC June 13, 2007

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Professors: Alex Chao Ron Ruth Post-specialist: Yuantao Ding Students: Daniel Ratner Jerry Wang Administrative: Tom Knight Margie Bangali Head: Yunhai Cai Staff: Gennady Stupakov Sam Heifets Karl Bane Zhirong Huang Yiton Yan Yuri Nosochkov Min-Huey Wang Associates: Bob Warnock Martin Lee John Irwin Members in Beam Physics Department

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Accounts Charged for the Activities ~50% quickening agent scrutinize: pillar flow and hazards, FEL material science ~50% program bolster: PEP-II, ILC, LCLS, SEBAR Year: 2006&2007, distributed 67 papers among them 16 on companion checked on diaries

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Core Competencies in Beam Physics Department Lattice plan and single-molecule bar progression away rings Designed optics for PEP-II, SABER, SPEAR3 overhauls, ILC Accelerator displaying and change, PEP-II Wakefield and impedance, aggregate impacts and dangers of seriously charged bar Impedance at high recurrence Coherent synchrotron radiation and its dynamical impacts Physics identified with ultra-short clusters Beam-shaft impacts in the colliders Simulation and parallel processing Lie-variable based math based direct and nonlinear examination codes: LEGO and Zlib PIC reproduction of bar collaboration and iridescence: BBI Nonlinear Vlasov solver for microwave shakiness Theory of free-electron laser Regenerative Amplifier FEL Teach at Stanford University and US Particle Accelerator School Single-molecule elements, FEL physical science, impedance and insecurities

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Improvements of Online Model VAX: SCP database: R-Matrix Or Twiss controlling bundle beta estimation Linux: PEP-II Optics codes MAD DIMAD LEGO AT Model codes MIA cushion information Parameters in optics model are utilized as contributions of bar recreation to make sense of what to do as the following stride. A few PC projects are created to right optics, for example, beta beating, scattering, and coupling.

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Comparison Between Measurement and Calculation Based of Beam-Based Online Model n x n y x-swaying scatterings

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Predictive Power of Precision Model Nonlinear Beam Dynamics Measured chromatic optics and element gap in HER Excellent assention amongst estimations and LEGO display in the chromatic optics Improvement of comprehension of nonlinear progression including sextupoles

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Developed Accurate Online and Offline Models Comparison of quadrupole quality between LER model and setup, May 30, 2007

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Improvement of Machine Optics and Luminosity for PEP-II Achieved crest glow: 1.2x10 34 cm - 2 s - 1 , August 15, 2006

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An Alternative Approach to Double the Luminosity Without Increase Beam Currents Beam-bar codes were benchmarked against our KEKB associates and numerous estimation. Reenactments demonstrate a huge increment of glow as coupling abatements in both machine. Some skew quadrupoles are important to lessen the plan vertical emittance. Broad tuning and MD might be important too.

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LER cross section with low vertical emittance The new IR nearby coupling adjustment is executed. It utilizes 12 extra perpetual skew quads (PSK) to decrease the outline vertical emittance from 0.50 nm to 0.034 nm. SK5,6L SK5,6 The fundamental wellspring of emittance in the plan cross section is the nearby coupling and scattering from SK5,6 skew quads on left/right sides of IR. old 5 PSK 7 PSK In the new arrangement, the IR coupling is better confined by setting the qualities of SK5,6 to zero, and including the 12 PSK quads nearer to IP. Their positions and qualities are streamlined for least vertical emittance. new IP

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Mode Emittances in the PEP-II Rings after the PSK cross section was actualized into the LER May 30, 2007 models. Right now, glow is 10% beneath the best accomplished esteem at streams of 2450/1775 mA.

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14 mrad ILC extraction line The ILC single IR optics is re-intended to permit a quick exchange between two unique indicators and diverse L* (push-pull locator choice). Updated extraction optics with vitality and polarimeter diagnostics, and the 2 nd bar center. Finder subordinate optics Fixed optics Fast x-y kickers clear the bar on 3 cm hover at the landfill to decrease control thickness and anticipate water bubbling in the landfill vessel. Upset extensive vitality spread prompts low vitality misfortunes. X collimators magnets Y

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f 0 =650 MHz ABCI Scale = 22.05 V/pC Impedance & Instabilities in the ILC Damping Rings A working gathering from a few divisions: PBD, ACD, ASD Develop an impedance model and gauge edge of insecurities, specifically, microwave flimsiness, which may has effect of decision of force compaction figure for the damping rings.

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RESISTIVE WALL IMPEDANCE OF A SURFACE WITH TRIANGULAR GROOVES A surface with triangular notches can altogether diminish the auxiliary emanation yield beneath the multipacting edge with powerless reliance on the extent of surface and attractive field. Electric field lines ready. Impedance intensification calculate as an element of the edge.

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For one general P and individual Q conformities, the advanced arrangement has q = Q/Q 0 ( Q 0 is the coordinated stacked Q) for the most part in the range [1, 2] Optimize inclination of the 26 depressions  g i (while keeping limit conditions) where 27d enhancement { q i , t b }, can be transformed into 3d streamlining { p , t b , q min }: g = G/G 0 ghead gtail q Optimization of ILC Linac RF Distribution System - for instance: Overall P and Individual Q Adjustments For p = 0.92, t b = 0.89, angle at head and tail of prepare One seed Red dabs give ( g lim ) I Loss just 3% contrast with 20% in the most pessimistic scenario

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SABER last center SABER last center is updated for utilizing existing SLAC save quadrupoles from SLC and FFTB. Round bar at IP with E = 28.5 GeV, b x = 1.5 cm, b y = 15 cm, h x,y = 0. IP With sidestep: s x = 5.5 m, s y = 6.1 m, s z = 19.3 m. W/o sidestep: s x = 6.9 m, s y = 6.7 m, s z = 18.8 m.

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Orbit Response of Horizontal Kick: q in Strongly Coupled Lattices General arrangement of shut circle: R abdominal muscle A b An a - 1 M stomach muscle an a

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Emittance trade "Normal" shaft design of RF firearm not ideal for FEL: transverse emittances too substantial, natural E-spread too little Better pillar setup reachable through 6D stage space control (level bar weapon + x-z emittance trade ) Very little transverse emittances "accomplished" in recreations for 20 pC charge,  x = 0.16  m  y = 0.0054  m  z = 11  m k dipole avoiding hole Emma, Huang, Kim, Piot, PRSTAB 9, 100702 (2006)

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HIGH FREQUENCY IMPEDANCE CALCULATIONS A hypothesis of high recurrence impedance is created for different non-axisymmetric geometries, for example, irises/short collimators in a bar pipe, venture in moves, venture out moves, and more convoluted moves of commonsense Importance [G. Stupakov, K. Bane, Zagrodnov, PRSTAB 10, 054401 (2007) ]. For a level iris with opening 2 g in a level shaft pipe of gap 2 b , the transverse impedances as elements of g/b .

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MICROWAY INSTABILITY STUDIES FOR THE ILC DR another PC code is created that comprehends a linearized Vlasov condition in the time area. The code is actualized in Mathematica; it can be effectively altered and expanded. Development rate for the CSR incited microwave unsteadiness as a component of current. Stage space of the microwave precariousness.

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Bunch Lengthening Variation along Bunch Train Due to RF Gap Transient & PWD crevice homeless people just Measured by Novokhatski Figures on right show computed variety of pack length at various streams (appeared in Amp) S. Heifets, S. Novokhatski, D. Teytelman, PRSTAB 10, 011001, (2007).

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Ultra-Low Emittance Ring with FEL A cross section with 0.1 nm-rad emittance at 7.0 Gev and 0.05 nm-rad at 4.5 Gev. Enduring state SASE: wavelength 5-100nm, beat length ~10 ps, rep rate ~ 100 kHz, top power ~ 1MW, undulator length ~ 100m HHG seeding:~1MW, ~10 fs at 10 nm, 10 m modulator+chicane HGHG FEL yield at ~ 3.3 nm 5 nm SASE

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Conclusion BPD has made critical commitment to the accomplishment for the PEP-II operation in the previous year the same number of long haul examine exercises exposing their natural products, most observable: bar shaft recreation and accuracy optics demonstrating. We proceeded to imperative adds to quickening agent ventures: ILC, SABER, LCLS, and future conceivable outcomes: SuperB and 5 th era light source. We distributed numerous quickening agent inquire about papers on companion investigated diaries and kept on educating at Stanford University and USPAS.

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