Get up and go II Progress and SLAC Future John Seeman for the PEP-II Team Particle and Particle-Astrophysics Directorate Stanford Linear Accelerator Center KEKB ARC Meeting December 4, 2007
Slide 2Topics Highlights of PEP-II Run 6. Primary exercises for Fall 2007 down Plan for PEP-II Run 7 in FY2008 Shut down arranging Brief SLAC Overview
Slide 3The PEP-II Team PEP-II MAC 1x10 34
Slide 4New Items for PEP-II in Run 6 Advances: Two new HER RF stations. New skew quad settle for IR2 LER x-y coupling found and actualized. Particular iridescence is higher. Quick dither IP criticism in and working (10 Hz). Vertical vibration in IR bolster tube damped with BaBar's offer assistance. Issues: Vacuum spill in HER IR Q4 chamber Damaged loops on IR Quadrupole Q2 HER flex-rib seals indicate releases More PG&E site wide AC control plunges than typical.
Slide 5HER Flex spine RF seal
Slide 6Example of a softened RF seal These GlidCop fingers are brazed onto the SS mounting plate Inside of ring
Slide 7Two-crevice model of a depression Omega seal left hole right hole Novokhatski
Slide 8New RF Seal Design: Installed 187 New Seals in Fall 2007 Same as the old plan yet omega fingers made out of silver plated Inconel. The whole SS plate is silver plated.
Slide 9HER HOM control Novokhatski
Slide 10LER HOM control in runs Novokhatski
Slide 11RF LER current points of confinement with new Pre-enhancers (Rivetta)
Slide 12Measurement of stage homeless people along pack prepare LER) tail head tail 7.3 m sec Streak camera picture (Cheng)
Slide 13200ns flat scale Near the cluster prepare crevice, 1722 bundles with 24 groups hole ~ 50ps 8.6 deg 4.2ns
Slide 14Beam Aborts Statistics
Slide 15Beam Aborts
Slide 16IP Characterization Use BaBar's following determination and prime scene for measuring essential parameters at the IP Three examinations every measuring e y , b * y dLumi/dz vertexing e + e - and m + m - occasions s yLumi (z) m + m - occasions s y'Lumi (z) m + m - occasions e-pillar (determination) Production vertices (x,y,z ~ 30 m) Boost directions ( q ~ 0.6 mrad) e+ bar
Slide 17BaBar IP estimations reported online Luminous Region centroids { x, y, z} sizes { x, z } like clockwork tilts { dx/dz, dy/dz } dL/dz fit { S z , b * y , z w , z c } each ~hour Boost Trajectory mean { x', y' } at regular intervals spread { x' HER , y' HER } at regular intervals }
Slide 18s z , H L Bunch Length Extraction from d L/dz Fits D V RF b y * = 13mm S z (mm) DS z 2 = 10.3 mm 2 ± 0.4 mm 2 10.9 mm 10.4 mm 10.8 mm ± 0.2 mm ± 0.2 mm BaBar Run
Slide 19IP Beta Function Measurements (BaBar) d L/dz s y L PEP stage propel b 2 s y' B
Slide 20New Skew Magnets to Improve LER Vertical Emittance �� 10 to half pick up at altered streams Physicist outline (F-J. Decker)
Slide 21HER emittance on July 18 (red), 2007
Slide 22LER emittance in July, 2007
Slide 23Record top particular radiance acquired in 2007 in the wake of diminishing LER coupling for lower Y emittance Managed to get a pinnacle particular glow (as appeared on red) with a lower LER current. 28-aug 9:00am, peplog
Slide 24Specific Luminosity in PEP-II By-2 (By-4)
Slide 25Run 6 nos. 11.69 2650x1900 311 858
Slide 28August 2007 was our Best month New month and 30 day records
Slide 29A glance at the course of events of BaBar information accumulation versus material science yield From BaBar There are more than 200 progressing investigations of BaBar information. More than 317 papers distributed & submitted for production.
Slide 30PEP-II Parameter Goals have not changed! 4 times plan 7 times outline
Slide 31Fall 2007 Down Activities (September 4-December 3) Finished LER BPM substitution. Included 5 HER Arc HOM cries. Included 12 LER IR2 HOM howls. Supplanted 187 HER Arc flex-rib RF "Omega Seals". Introduced two new LER Q5 chambers in IR2. Introduced repaired HER Q4L chamber.
Slide 32Interaction Region Layout Summer 2007 shutdown work BaBar locator LER Frang. Connect changed HER Frang. Interface supplanted LER Q5L supplanted LER HER LER Frang Link supplanted HER Q4L repaired LER Q5R supplanted
Slide 33Side perspective of BaBar Q2 magnet
Slide 34HER Q4L chamber Installed new, bigger opening, Al chamber amid 2006 down Flexflange weld fizzled April 2007, brief repair with Vacseal Removed Al chamber and reinstalled old StSt chamber while Al chamber repaired Flexflange supplanted with settled rib New Al chamber Old StSt chamber
Slide 35HOM retaining cries Components Welded Bellows Restraint OFE Cu Prong Body Ceralloy Tile Glidcop Stub SST Water Jacket Cover SST Prong Support J-Seal Glidcop RF Fingers Inconel Spring Fingers
Slide 36HOM engrossing roars Novokhatski Weathersby Kurita Reeck Metcalfe In IR 2 we are supplanting 5 howls segments in the upstream LER and HER and 7 units in the downstream LER with roars modules that contain HOM engrossing tiles. We would like to lessen the HOM control here Absorbing tiles
Slide 37General Overall Plan for Run 7 (Dec 2007-Sept 2008) Start the linac and PEP-II on December 7. Go through the occasions. Accomplish more machine studies (MD) right on time to expand radiance toward the start of the run. Locate the ideal radiance condition by early spring. Go through September 30 with best relentless state conditions.
Slide 38Now
Slide 39PEP-II Shut Down PEP-II will quit creating information for BaBar on September 30, 2008, around ten months from now. Liveliness II and BaBar will then move quickly into a "Negligible Maintenance State (MMS)" which takes a little more than a year. In the medium time span, PEP-II will be at this MMS with some exertion going into passage upkeep, wellbeing lighting, electrical security and mechanical security. Profitable things will be saved. For long haul, D&D of PEP-II is being concentrated on. A DOE audit was held August 6-7, 2007.
Slide 40SLAC Future Options Ongoing projects: ILC, PEP-II, SPEAR-3, ATLAS, LARP, Astrophysics, EXO-200 Near term ventures: LCLS Possible future tasks: LSST, SNAP, ATLAS updates, LCLS overhauls, PEP-LS, LHC redesigns, High Gradient program, EXO2000, Super-B, … SLAC has begun a long range arranging exercise taking a gander at these future activities. Concentrate on not completed yet.
Slide 41Super-B Factory Design SLAC is contributing unobtrusively to the outline exertion for a Super-B Factory. Created a Design Report in Spring 2007 (SLAC Report R-856). The objective is a consider of 100 increment glow over PEP-II. Utilizes "ILC-like" damping rings with little emittances, crab-midriff at the IP, and littler bar streams to spare power. Supporting unassumingly the exertion of INFN in Italy driving towards a Super-B quickening agent and finder to be worked close Rome. SLAC could consider contributing in-kind quickening agent and locator segments after September 2008 when PEP-II and BaBar are killed. Maybe beginning in FY2011.
Slide 42LCLS Progress Injector introduced Spring 2007. Injector and first group compressor effectively tried by August 2007. Pillar accomplished 15 GeV. Second pack compressor introduced Fall 2007. New compressor will be tried January 2008. Downstream LCLS with undulator to be introduced spring-Fall 2008 and authorized in December 2008. In the first place clients in Summer 2009. Full arrangement of clients in Spring 2010.
Slide 43PEP-II Conclusions PEP-II quickening agent in Run 6 was more troublesome than arranged yet the run finished well. Execution of the Fall 2007 close down went well. Updates towards ~2 10 34 are finished with the point of 250 fb - 1 more to 750 fb - 1 add up to. The iridescence will be sloped as quick as would be prudent in Run 7. Kick II will coordinate however much glow as could reasonably be expected. Get up and go II will kill September 30, 2008.
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