Development of ML-BPM for STF cryomodule H. Hayano, KEK SunYoung Ryu, PNU.

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Presentation transcript:

Development of ML-BPM for STF cryomodule H. Hayano, KEK SunYoung Ryu, PNU

History and Background Development was started in 2005 for STF cryomodule BPM. T. Hino (M. student of Tohoku-Gakuin Univ.) for ( 1st version of model BPM) SunYoung Ryu (M. student of Pusan National Univ. Her teacher:Jung Keun Ahn, with connection to ILC-Asia contact: Eun San Kim ) for 2007, She will continue the development for ( 2nd version of model BPM, then go to proto-type)

Design Requirement High resolution ( < 1µm for single pass ) Good fiducialization capability with respect to magnetic center (cylindrical outer, good common-mode rejection required) Big beam-pipe aperture ( 78mm diameter ) HPR washable and cleanness required Need to withstand wide thermal excursion without vacuum leak Bunch-to-bunch signal acquisition required ( low QL ) No interference with cavity HOM( GHz and > 2.3GHz) Cavity BPM with 4 slots coupled; high resolution, good fiducialization, withstand to thermal excursion Use 2nd higher mode; match to big beam pipe, easy to get low QL 4 slots open to beam pipe; HPR washable Drawback: Big size, heavy, Feed-through are weak to HPR & thermal excursion

HFSS model of 2nd version Slots for HPR wash Cavity diameter: 312 mm Cavity thickness: 20 mm Slot width: 10 mm Beam pipe diameter: 78 mm Material: SUS Coupling Slots Used Mode: TM120 F0: 2.04GHz QL: 260

S11 & S21 on 1.8GHz ~2.3GHz TM GHz RF properties of Model BPM X-Y isolation : < -30dB How close to other mode signal : df=80MHz WG cut-off 1.7GHz

Antenna Scan results X-scan with anti-phase combiner 10µm step Y-scan with anti-phase combiner

Schedule of Development Feb - May : preparation of beam test at ATF using this model cavity in a big chamber Jun : beam test at ATF Linac end Feb - Jun: in parallel, design comparison with Saclay BPM, FNAL BPM, SLAC BPM Jun : Decision of design and direction of development July - : development feed-through connector. design of vacuum tight BPM design of electronics Fall : fabrication of vacuum tight BPMs (three of them) ( three-BPM method for resolution estimation)