Two Bunch Injection Issues Franz-Josef Decker 6-Dec-2004 Goals: 1.Two bunch injection will reduce the time to inject from scratch. 2.Two bunch injection.

Slides:



Advertisements
Similar presentations
USR-WS (Beijing) Oct. 30 – Nov. 1, 2012 K. Soutome (JASRI / SPring-8) on behalf of SPring-8 Upgrade Working Group Injection Scheme for the SPring-8 Upgrade.
Advertisements

Some Timing Aspects for ILC Heiko Ehrlichmann DESY GDE, Frascati, December 2005.
LONGITUDINAL (IN)STABILITY WITH BATCH INJECTION T. Argyropoulos, P. Baudrenghien, C. Bhat, J. E. Muller, T. Mastoridis, G. Papotti, E. Shaposhnikova,
On Cavity Tilt + Gradient Change (Beam Dynamics) K. Kubo K. Kubo.
PIP and the Booster Notch Bob Zwaska October 12, 2011 PIP Meeting.
ILC RF phase stability requirements and how can we demonstrate them Sergei Nagaitsev Oct 24, 2007.
R. Akre, P. Emma, P. Krejcik LCLS April 29, 2004 LCLS RF Stability Requirements LCLS Requirements The SLAC Linac.
June 2-4, 2004 DOE HEP Program Review 1 M. Sullivan for the PEP-II Team DOE High Energy Physics Program Review June 2-4, 2004 PEP-II Status and Plans.
Feed forward orbit corrections for the CLIC RTML R. Apsimon, A. Latina.
A U.S. Department of Energy Office of Science Laboratory Operated by The University of Chicago Argonne National Laboratory Office of Science U.S. Department.
Providing Beams for Power Production What has been done Problems and Boundary Conditions Future improvements and possibilities.
Feed forward orbit corrections for the CLIC RTML R. Apsimon, A. Latina.
SPPS, Beam stability and pulse-to-pulse jitter Patrick Krejcik For the SPPS collaboration Zeuthen Workshop on Start-to-End Simulations of X-ray FEL’s August.
Simulation and Experimental Results of SSRF Top-up Operation Haohu Li, Manzhou Zhang SSRF Top-up Workshop, Melbourne
Electron Source Configuration Axel Brachmann - SLAC - Jan , KEK GDE meeting International Linear Collider at Stanford Linear Accelerator Center.
LCLS_II High Rep Rate Operation and Femtosecond Timing J. Frisch 7/22/15.
FLASH II. The results from FLASH II tests Sven Ackermann FEL seminar Hamburg, April 23 th, 2013.
Production of bunch doublets for scrubbing of the LHC J. Esteban Muller (simulations), E. Shaposhnikova 3 December 2013 LBOC Thanks to H. Bartosik, T.
AEM – Special Report Linac Current Stability and Modulation June 25, 2007 Presented by: Doug Moehs Philippians 4:6-7 (Doug) Do not be anxious about anything,
1 FONT R&D status Philip Burrows Douglas Bett, Neven Blaskovic, Glenn Christian, Michael Davis, Young Im Kim, Colin Perry John Adams Institute Oxford University.
Injector Commissioning Masanori Satoh (Accelerator Laboratory, KEK) for the Injector Linac Commissioning Group The 20th KEKB Accelerator Review Committee,
9/24-26/07 e- KOM Slide 1/20 ILC Polarized e- source RDR Overview A. Brachmann.
02/18/09 Dump line beam steering and beam losses (Sept 26, 2008 studies) Xiaowei Dong & John Carwardine (Argonne) TTF/FLASH 9mA meeting, 23 February 2009.
FFAG Studies at RAL G H Rees. FFAG Designs at RAL Hz, 4 MW, 3-10 GeV, Proton Driver (NFFAGI) Hz,1 MW, GeV, ISIS Upgrade (NFFAG) 3.
Beam Loading experiment at KEK ATF ( Multi-train acceleration at KEK-ATF Injector ) KEK Masafumi Fukuda and Junji Urakawa LCWS /10/052 train acceleration.
1 Franz-Josef Decker 1 Multi-Bunch Operation for LCLS Franz-Josef Decker March 17, Definitions and goals multi-bunch within.
Damping Ring Parameters and Interface to Sources S. Guiducci BTR, LNF 7 July 2011.
LCLS LLRF System October 10-13, 2005 LLRF05 B. Hong, R. Akre, A. Hill, D. Kotturi, H. Schwarz SLAC, Stanford, Menlo Park, CA 94025, USA Work supported.
The SPS as a Damping Ring Test Facility for CLIC March 6 th, 2013 Yannis PAPAPHILIPPOU CERN CLIC Collaboration Working meeting.
Booster Losses Keith Gollwitzer PIP and MI 700 kW review January 2015.
RF improvements over the weekend Giulia on behalf of Delphine, Philippe, Andy and many other people in the RF team LHC Beam Commissioning Working Group,
Bunch Separation with RF Deflectors D. Rubin,R.Helms Cornell University.
SLAC ESA T-474 ILC BPM energy spectrometer prototype Bino Maiheu University College London on behalf of T-474 Vancouver Linear Collider.
Craig Drennan Linac and 400 MeV BPMs January 7, 2011.
1 Fast kicker study Machine Time 2011/10/18~10/29(2 weeks) TB meeting 2011/01/14 T.Naito.
Thomas Jefferson National Accelerator Facility Operated by the Southeastern Universities Research Association for the U.S. Department of Energy Harmonic.
Beam Physics Issue in BEPCII Commisionning Xu Gang Accelerator physics group.
LER Workshop, Oct 11, 2006Intensity Increase in the LER – T. Sen1 LHC Accelerator Research Program bnl-fnal-lbnl-slac  Motivation  Slip stacking in the.
Franz-Josef Decker 14-Dec-2011 CSR is a big deal limiting performance Tolerance studies beforehand helped a lot Tor’s List Software adaptability helped.
Injection System Update S. Guiducci (LNF) XVII SuperB Workshop La Biodola, Isola d'Elba, May 29 th 5/29/111.
Dither Luminosity feedback versus Fast IP feedback
Multi-bunch Operation for LCLS, LCLS_II, LCLS_2025
Top-Up Injection Schemes
Steering algorithm experience at CTF3
Alternative/complementary Possibilities
Plans for ions in the injector complex D
LLRF'15 Workshop, Shanghai, Nov. 4, 2015
Auxiliary Positron Source
Beam-Based Feedback in LCLS-II
Junji Urakawa (KEK) for ATF International Collaboration
New AD Production Beam in the PSB
Bunch Separation with RF Deflectors
FCC-hh injection group 7
Top-Up Injection for PEP-II and Applications to a Higgs Factory
Revised Commissioning Strategy
BC2 Commissioning Parameters
LCLS Commissioning Parameters
LCLS Commissioning Parameters
LCLS Commissioning Parameters
RF Pulse Shaping.
Feed forward orbit corrections for the CLIC RTML
Beam dynamics requirements after LS2
LCLS RF Stability Requirements
Operational Experience with LCLS RF systems
Kicker and RF systems for Damping Rings
Kicker specifications for Damping Rings
JLEIC ion fullsize booster (2256m) space charge limit (Δν=0
Saturday 15th May One bunch 1 e11 per beam 09:57: start ramp
CDR2 – Injection System Injection system overview (Seeman) (2 pages)
JLEIC CCR Path Length and Gap Formation
Presentation transcript:

Two Bunch Injection Issues Franz-Josef Decker 6-Dec-2004 Goals: 1.Two bunch injection will reduce the time to inject from scratch. 2.Two bunch injection might create the possibility to run the Linac at a lower rate a) 15 or 20 Hz will save some energy [~$ per day ?]. b) The lowest rate should not need to have heaters on most of the time, tests were planned for Oct-Dec Issues for Linac / Injector: 1.For e – most hardware is capable for two bunches like with SLC beams: DR kickers are flat, energy curve (PSK_HER) is rising, … 2.Issues with feedbacks, BPMs, stability, … has to be studied. 3.Positrons need more attention: PSK_Scav, Li19 kicker, SDR injection and extraction kicker. Issues for PEP-II: 1.BIC 2.Fast filling and slow feedbacks for faster IR change due to heating

First two-bunch pair at the end of the injection line 7-Nov-2003

General Issues 1.Shortest bunch separation: 16* (sub-harmonic buncher) and 6* (PEP-II) gives 3*5.6 ns = 16.8 ns (8 PEP-II buckets apart). 2. Fill PEP-II with one pattern [by2_2b] and then go to the normal trickle pattern [by2]; e.g.: by2_2b: 0:3400:16=1; 2:3400:16=1; 4:3400:16=1; 6:3400:16=1; 8:3400:16=0.01; 10:3400:16=0.01; 12:3400:16=0.01; 14:3400:16=0.01; 0.01 fools the BIC so it cannot complain about charge in the wrong bucket 3.Kicker set-up: The fast kickers (~60 ns) for the scavenger in Li19 and the positrons in the SDR have to be timed 8.4 ns later and raised by about 5%. The beams will then be on the raising or falling edge and more susceptible to timing jitter. (A longer term solution is to upgrade the hardware to NDR style kickers.) 3.PSK timing: Currently the HER and LER beams have a PSK timing of about 220 ns, which means they are injected into the Linac early, the RF will reach its peak 220 ns afterwards. This gives them about 6% less energy compared with the peak or the same energy as a beam with a BNS phase offset (20  ). The rising amplitude will compensate the beam-loading similar to E-158 running: 4.5E11 for 250 ns == 4.5E10 for 25 ns == 3.0E10 for 16 ns. So the charge per bunch should stay constant: 10% variations gives 0.05% in  E/E.

More General Issues 3.(More PSK): The scavenger (and FFTB) beam have currently no PSK timing offset, which means that the second bunch would have about 0.5% less energy. To compensate this effect there are two possible adjustments: a) lower the energy of the scavenger line 25  23 GeV, (reducing the positron production), and introducing some PSK offset (introducing some mismatch in early linac). b) Reduce BNS phase and raise PSK timing (increased wakefield-amplified jitter). 4.Positron production: This is probably the most not-understood issue. In the front-end at the gun and injector area we have special pulsed timing and pulsed phases to adjust for amplitude and phase loading. The positron capture section doesn’t have this and the question is how bad will it be? 0.5% energy loading corresponds to about 0.3  phase loading, which seems small enough. 5. Diagnostic and BPMs: The Nov-2003 test showed the beam already on the PEP-II injection timing scope before any sign of a second beam was seen in the front end. BPM response was not yet studied. This will impact how we setup and operate our steering feedbacks.