ISG3 Injector Working Group (WG2) Goals and Plans
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1 SG3 njector Working Group (WG2) Goals and Plans Compare and contrast and beam parameter specifications; highlight and understand differences. Discuss main damping ring and predamping ring lattice designs; compare and contrast differences between and designs. Discuss damping ring development programs. Discuss beam loading compensation in the injector linacs, capture regions, and compressor sections of the and. Meet with the JLU Parameters Group.
2 i SG3 WG2: NJECTOR SYSTEMS PARTCPANTS January 25-28, 999 KEK, Japan H. Hayano, S. Kashwagi, K. Kubo, S. Kuroda, S. Takeda, N. Toge, K. Yokoya Kyoto University, Japan H. Sakai LBNL, USA J. Corlett, N. Hartman, K. Kennedy, D. Li, S. Marks, R. Rimmer SLAC, USA K. Bane, V. Bharadwaj, J. Clendenin, P. Emma, D. Farkas, K. Jobe, J. Judkins, T. Kotseroglou, P. Krejcik, 2. Li, G. Loew, D. McCormick, B. McKee, K. Millage, M. Minty, M. Munro, V. Nesterov, C. Pappas,T. Raubenheimer, M. Ross, D. Schultz, H. Schwarz, J. Sheppard, C. Spencer, R. Tighe, M. Woodley SSRLSLAC, USA J. Corbett
3 SG3 njector Working Group (WG2) Agenda, rev. 4 (Fuji Room, Bldg. 24) - Monday: lo:5 AM Agenda/Report/Logistics: Recent Work at the ATF: Sheppard Minty, Woodley :30 PM Layout of the njector System: Sheppard JLU njector Beam Parameters: Hayano, Schultz, Sheppard Breakout Discussion on Report: Ha&.mo, Ross, Schultz: Sheppard Tuesday: 0:00 AM :30 PM Beam Loading Compensation: Beam Loading Compensation: Breakout Discussion on Report: ntroduction: NX DR RF Cavities: DR Wigglers: DR Kickers: DR Beam Loading: Laser Wire in ATF-DlU-DR: Kashiwagi Li Hayano, Ross, Schultz, Sheppard Ross Rimmer Marks Pappas T&he Sakai Wednesday: 0:00 AM :30 PM: Joint Session with Parameters Working Group DR/PreDR Design: Kuroda DR/PreDR Design: Emma JLU njector Beam Parameters: Hay;lno, Schultz, Sheppard Breakout Discussion on Report: Hayano, Ross, Schultz, Sheppard Thursday: 9:00 AM :30 PM Summary Preparation: DR Lattice Plans: WG2 Summary: Training Center Hayano, Ross, Schultz, Sheppard Raubenheimer/Kuroda Hayano, Ross, Schultz, Sheppard
4 -. KEK - SLAC njection system parameters version date: l/28/99 Polarized Electron Source Energy E kev Energy Spread dele % Single Bunch sikgma E WE % Emittance (edge) (r-6m-rad Bunch Length dt ps, FwHM Particles/Bunch nb l(r0 Pop. Uniformity dnblnb % Bunch Spacing ns Repetition Rate HZ Polarization <l $> ejqq 85 NLJ2 < < < notes: rma-pulse variation Thermionic Electron Source Energy E kev Energy Spread de/e % Single Bunch sigma E SE/E % Emittance (edge) O-6m-rad Bunch Length dt ps Particles/Bunch nb lo 0 Pop. Uniformity dnblnb % Bunch Spacing ns Repetition Rate Hz loo (/ ic o < <l <0.5 long-term HV pulse stability short-term HV pulse stability beam pulse flatness LU lnj. Sys Pxsms l/99 of3 DCS 2899
5 - KEK - SLAC njection system parameters Bunching system version date: l/28/99 notes: Enerpy E MeV Energy Spread dele % Single Bunch si,sma E SE/E % Emittance loa-6m-rad Bunch Length dt ps Particles/Bunch nb lo*0 Pop. Uniformity, sn dnb/nb % SHB frequency Mhz Bunch Spacing Tb ns Repetition Rate R Hz 80 <l <l (85% beam) <l better than SLC & ATF <l (fwhm) 2.0 < Positron Qgg Target Energy E GeV Emittance loa-6m-rad Bunch Length dt ps, FwHM Particles/Bunch nb l(r0 Pop. Uniformity dnblnb % Beam radius mmmls beam power/area NGeVlrnm 2, loa 2 Bunch Spacing ns Repetition Rate Hz Average Beam Power PB kw Target thickness WRe RL TarSet power PT kw 0 <loo ,GQ cre notes: L < < 2 (?> Capture RF frequency bunch length final ener,oy capture emittance energy aperture pre-dr acceptance e+ c3pture ratio into linac et- capture ratio into Pre-DR Mhz 2856 % ps, Fw tbd 30 MeV m-rad.003 (n-m).06 (edge) MeV m-rad #e+ per e #et per e = LC/ nj. Sys Params l/99 2of3 DCS /28/99
6 KEK - SLAC njection system parameters Linacs Pol. e- njector Frequency Mhz Energy E GeV Energy Spread dele % Single Bunch sigma E SE/E % Emittance l W-6m-rad Bunch Length dt ps, FwHM Particles/Bunch nb lo 0 Pop. Uniformity dnblnb % Bunch Spacing ns Repetition Rate HZ Positron drive linac Frequency Mhz Energy E GeV Energy Spread de/e % Single Bunch si_gma E SE/E % Emittance W-6m-rad Bunch Length dt ps, FwHM Particles/Bunch nb l(r0 Pop. Uniformity dnblnb % Bunch Spacing ns Repetition Rate Hz Positron njector linac Frequency Mhz Energy E GeV Energy Spread defe % Single Bunch sigma E SE/E % Emittance m-rad Bunch Length dz mm, sigma Particles/Bunch nb loa Pop. Uniformity dnbinb % Bunch Spacin_e ns Repetition Rate Hz Pre-DR acceptance m-rad Encrsy acceptance % version date: l/28/ kl tbd < 0.5 <loo <0.5.@ PSQ!?-0 ls E fl tbd <loo AB tbd (rms) tbd.7 AD > fl < <J& fl < (edge) cl 7-o 0.09 k.5 LU nj. Sys Pxms 99 3of3 DCS X99
7 olarizctl electron side KEK SLAC SLAC SLAC SLAC KEK SC;llCtl design (mnx) ilesigrl (max) SCdCd Positron side losses KEK SLAC e- gun losses 2.9x x0*0.0x0 0 Buncher -30% 30% SLAC KEK O/6.2 GeV Linac e- gun 30% -30% l3uncher.!8 GeV Linilc 2.0x0 0 l.8xlo lo xlO lo x x2 x e+ target.98 GeV Linnc -20% Pre DR -20% 60% O% -0% Mnin DR.4.2 -_-_--_ _--_ _-_ * --,. - - Main DR -0% BC BC 8 CeV Linac 8 CeV Linac % -0% Arc Arc -0% % l3c2.... BC2 LC/ lnj. Sys P;lri~tl~s 99 DCS /28/99
8 SG Meeting 999 JAN.2528 QSLAC i.energy Compensation in lniector Linac S, Kashiwagi The Graduate University for Advanced Studies
9 -. Conclusion. f we use the AF ECS in injector linac for damping ring, the choice of AF fequency is very important. 2. The two different types of multi-bunch ECS meth -ads (local & unlocal ECS) were compared using tracking simulation. From simulation result, local ECS method is able to suppress the emittance growth due to the chro -matic effect than the unlocal ECS method. 3. n the S-band injector linac, short-range transverse wakefietd is main source of transverse emittance growth. n the AF ECS, the oscillation of transverse motion increase by the energy spread between head and tail in a single bunch in the accelerating structure.
10 Beam loading compensation Pulse compression using SLED- AF scheme - Extra AF rf systems (+distribution) - Flexible filling time - Staight forward - Compensation non-local, OV,,, = p - Residual AE add AT scheme - Amplitude modulation, or phase modulation - Filling time optimized - Coupled to gradient and current - Local compensation O> effective for both accelerator and compressor
11 -.. Low RF Linacs, Compressors: Loading Compensation Lina N Freq Energy Average Current Compensation e+ capture L() GeV <4.5 A (7.9 x lolo ns) AF e+ booster L() 250 MeV.98 GeV <0.9 A (.6 x lolo ns) AT e+ drive S() 6 GeV <0.83 A (.45 x lolo ns) AT e- booster S() 80 MeV -.98 GeV <0.83 (.45x lolo ns) AT Pre-linacs S(2).98 GeV - 0 GeV <0.66 A (.5 x lolo ns) AT EC BCl L(2X2) -00 MeV <0.83 A (.45 x lolo ns) AT(?) BC2 d2) GeV at 90 phase <0.66 A (.5x lolo ns) AT(?)
12 WG2 njector Systems Group Report () Agenda, Participation, and Summaries of the 4 SGs: (0 SGl (ii) SG2 (iii) SG3 (iv) SG4 (2) Parameter Table, annotated for definitions and to explain differences in values (0 Beam Parameters (ii) Beam Jitter (iii) Acceptances (iv> Beam Loss 09 Overhead (3) Discussion of Technology Choices, text associated with (2) (9 Positron Production (ii) PreDamping ring (iii) Main Damping Ring (iv) L-band 69 Beam-Loading Compensation (vi)..... (4) Preconstruction R&D Requirements and Demonstrations Report is limited in scope to only those topics covered in SG discussions. Expanded Outline by pre-sg4 meeting (HWJCS). Update to Parameter Table by Pre-SG, yet another Update for SG4. Discussion of topics (2) (3), and (4) at SG4. Complete outline, make writing assignments and schedule for report (including drafts) at SG4.
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