Recent Developments in CLIC Injector Optimization
Recent work at CLIC includes optimizing the positron source, developing the drive beam injector front end, and exploring new baselines. A new student has joined to work on the positron source simulations. Preliminary studies show promising results in increasing the solenoid field for the positron source. Progress has been made on components like modulator-klystrons and diagnostics for the CLIC front end. Alternative layouts are being considered to streamline the CLIC design.
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Presentation Transcript
Status of the CLIC Injectors No changes to the electron injector Some work started on optimizing the positron source with a student started recently Continue to develop the drive beam injector front end, see LCWS 2013 Some work on the new baseline for CLIC LCWS 2014, Belgrade, October 6th-10th, 2014 Steffen D bert, BE-RF
Positron source Plan to have for the first time consistent simulations from the target to the damping ring and optimize the positron yield. New Student Cafer Bayar joint us very recently and started to work. Phase space after target, after AMD and at the end of the 200 MeV pre-injector linac using CDR parameters
Positron source Very preliminary studies, playing with acceleration and deceleration scenarios. Increasing the solenoid field to 1 T instead of 0.5 T seems to help a lot. Is it feasible, affordable ? Cafer Bayar
CLIC DB front end, Post CDR Project Modulator-klystrons, 1 GHz, 20 MW 500 MHz Diagnostics SHB 1-2-3 Acc. Structures Gun PB TW-Buncher ~ 12 MeV ~ 140 keV ~ 3 MeV Major components under development, gun, SHB, PB, TW-Buncher As well as power sources, up to 100 kW , wide band solid state source at 500 MHz and 20 MW L-band klystron with 70 % efficiency (two prototypes have been ordered with Thales and Toshiba)
New CLIC base line studies Alternative layout: without positron driver linac and e- PDR, 2 GHz bunch spacing everywhere 156ns 156ns e- e- e+ 3300 ns Positron production pulse Pre-injector e- Linac 0.2 GeV 2.86 GeV Injector Linac DC gun PDR BC1 e+ DR target Booster Linac 2 GHz e- DR 6 GeV gun Save two rings, positron driver linac, and tunnel length (saving potential 200 MCHF)
Layout with undulator based positron source Main beam bypass line to transfer line, DR Undulator positron source Photons 300 m target Undulator 350 m 2.86 GeV linac ? 300m ~1000 m IP Main Linac BDS Main Linac BDS from injectors Pre-injector e- Linac 0.2 GeV 2.86 GeV Injector Linac DC gun PDR BC1 e+ DR target to main linacs Booster Linac 2 GHz e- DR 6 GeV gun Spin rotator Minimum scenario for upgrade to positron polarization and fully compatible with conventional layout
Undulator based positron source Consequences: 400 -1000 m more linac length (both sides ?) Separate injector linac for positrons 2.86 GeV transfer line from the tunnel to the injector complex Spin rotator before and after damping ring (needed anyway for any polarized scheme) Gap in damping ring due the delayed beams Main beam bypass around positron production Coupling of the two beams
How about a dedicated scheme ? DR and injector at the end of each side PDR e+ DR IP BDS BDS Main Linac Main Linac 2.86 GeV e- DR Booster Linac 6 GeV DC gun
Conclusion For time being minimum effort going into the main beam injector studies due to lack of manpower and other priorities in the project We feel it is not the most critical area for CLIC to work on Some effort in developing the drive beam injector front end including the sophisticated power sources. Wide band for sub-harmonic switching and very high efficiency for drive beam Hopefully we can revive some work on the positron source with the new student No conclusions yet for the new baseline
