TTF

Paper	Title	Other Keywords	Page
MOXPA02	SCRF Test Facilities toward the ILC	KEK, DESY, XFEL, linac	5
	K. Saito KEK, Ibaraki
	After the ICFA selection of the superconducting linear collider technology in August 2004, many intensive R&D programs are in the planning stage or already underway. Work is proceeding in the three major geographical regions involved in the ILC: Europe(TTF), North America (SMTF) and Asia (STF). In this paper, the global activity represented by these superconducting RF test facilities will be reviewed. Their goals, plans, schedules and possible complementarities will be presented. The performance expected from the different R&D efforts by 2008, and the corresponding contribution to the ILC Technical Design Report, will be especially emphasized.
	Transparencies
MOPCH140	Compensation of Lorentz Force Detuning of a TTF 9-cell Cavity with a New Integrated Piezo Tuner	klystron, controls, feedback, resonance	378
	G. Devanz, P. Bosland, M. Desmons, E. Jacques, M. Luong, B. Visentin CEA, Gif-sur-Yvette
	The high gradient operation of superconducting elliptical multicells in pulsed mode is required for linear colliders or free-electron lasers based on the superconducting technology. Such an operation is limited by dynamic Lorentz force detuning if no compensation for this effect is attempted. The RF power headroom required for accelerating field amplitude and phase stabilisation by low-level RF control techniques solely would be too costly. A new active tuner with integrated piezo actuators has been developped in the framework of the european CARE/SRF program solve this issue. The design is based on the lever-arm concept of the Saclay tuner already installed on running TTF cavities. We have carried out integrated tests of the 9-cell cavity equipped with the piezo tuner and power coupler in the CryHoLab horizontal test cryostat. Characterisation of the electromechanical system consisting of the cavity and piezo-tuner assembly and full power pulsed tests will be presented.
MOPCH161	Development of a Prototype Superconducting CW Cavity and Cryomodule for Energy Recovery	ERL, TESLA, linac, ERLP	436
	P.A. McIntosh, C.D. Beard, D.M. Dykes, B. Todd CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire S.A. Belomestnykh Cornell University, Laboratory for Elementary-Particle Physics, Ithaca, New York A. Buechner, P. Michel, J. Teichert FZR, Dresden J.M. Byrd, J.N. Corlett, D. Li LBNL, Berkeley, California T. Kimura, T.I. Smith Stanford University, Stanford, Califormia M. Liepe, V. Medjidzade, H. Padamsee, J. Sears, V.D. Shemelin Cornell University, Ithaca, New York D. Proch DESY, Hamburg
	Energy Recovery LINAC (ERL) and LINAC-driven FEL proposals and developments are now widespread around the world. Superconducting RF (SRF) cavity advances made over the last 10 years for TESLA/TTF at 1.3 GHz, in reliably achieving accelerating gradients >20 MV/m, suggest their suitability for these ERL and FEL accelerators. Typically however, photon fluxes are maximised from the associated insertion devices when the electron bunch repetition rate is as high as possible, making CW-mode operation at high average current a fundamental requirement for these light sources. Challenges arise in controlling the substantial HOM power and in minimizing the power dissipated at cryogenic temperatures during acceleration and energy recovery, requiring novel techniques to be employed. This paper details a collaborative development for an advanced high-Qo cavity and cryomodule system, based on a modified TESLA cavity, housed in a Stanford/Rossendorf cryomodule. The cavity incorporates a Cornell developed resistive-wall HOM damping scheme, capable of providing the improved level of HOM damping and reduced thermal load required.
MOPCH166	Construction, Tuning and Assembly of the Beta=0.12 SC Ladder Resonator at LNL	target, simulation, EURISOL, linac	451
	G. Bisoffi, E. Bissiato, A. Palmieri INFN/LNL, Legnaro, Padova
	The Ladder resonator is a 4-gap full Nb cavity suitable for the 0.1< beta <0.2 range of high current proton linacs. A beta=0.12 Nb prototype of this cavity has been built by ZANON (Schio, Italy) on the basis of LNL design. In this paper we describe the construction procedure of such cavity, as well as the tuning steps, aimed at the achievement of the target frequency of 352.2 MHz and the desired field uniformity along the four gaps. Related results of RF simulations and room temperature tests are presented. The preparation of the SC test at LNL is at an advanced stage.
MOPCH170	Experimental and Theoretical Analysis of the Tesla-like SRF Cavity Flanges	vacuum, TESLA, cryogenics, collider	463
	L. Monaco, P. Michelato, C. Pagani, N. Panzeri INFN/LASA, Segrate (MI)
	In view of the future large SC accelerator, an improvement of the reliability and a cost reduction of the SRF cavities cold flanges is required. In this paper, a critical analysis of the TESLA-like cold connection flanges at room and at cryogenic temperature is presented. This analysis is based on experimental characterization of the mechanical properties of the joint and of the leak rates during the sealing process. A FEM model, that agrees with the experimental data, is also presented. This model is being used for the optimization of the present SRF flanges and the development of new cold connections.
MOPCH171	ILC Coaxial Blade Tuner	DESY, LEFT, electron, linear-collider	466
	C. Pagani, A. Bosotti, P. Michelato, N. Panzeri, R. Paparella, P. Pierini INFN/LASA, Segrate (MI)
	A coaxial (blade) tuner solution has been developed for the compensation of the Lorentz force detuning of the superconducting cavities under the high gradient pulsed operation foreseen for ILC operation. The device is based on prototypes successfully tested at DESY in 2002 both on CHECHIA and on the superstructures inserted in the TTF string. During both tests the blade tuner performed as expected in terms of stiffness, frequency sensitivity and tuning capabilities. An improvement of the tuner characteristics has been designed by the integration of fast tuning capabilities by means of piezo-ceramic element. Two prototipes of the new INFN coaxial piezo blade tuner have just been manufactured and they will be tested at DESY and BESSY after the cavity integration. In this paper the blade tuner design and main characteristics are presented, together with the early interpretation of the cold test results.
MOPLS104	The Progress in Developing Superconducting Third Harmonic Cavity	DESY, simulation, coupling, XFEL	804
	N. Solyak, H. Edwards, M. Foley, I.G. Gonin, E.R. Harms, T.K. Khabiboulline, D.V. Mitchell, D.O. Olis, A.M. Rowe Fermilab, Batavia, Illinois
	XFEL and TTF facilities are planning to use section with a few third harmonic cavities (3.9GHz) upstream of the bunch compressor to improve beam performances [1-2]. Fermilab is developing superconducting third harmonic section for TTFII upgrade. This section will include four cavities equiped with couplers and blade tuners, installed in cryostat. Up to now, two cavities are complete and one of them is under test. The status of the cavity development and preliminary test results are presented in the paper.
TUPCH070	Development of Beam Profile Monitor for Cyclotron	cyclotron, CDA, positron, vacuum	1169
	K.-H. Park, S.-M. Hong, Y.G. Jung, D.E. Kim, H.-G. Lee, W.W. Lee PAL, Pohang, Kyungbuk D.H. An, J.-S. Chai, Y.S. Kim KIRAMS, Seoul B.-K. Kang POSTECH, Pohang, Kyungbuk
	A beam profile monitor was designed and fabricated to measure the beam shape of the cyclotron MC50 beam line at KIRAMS. The sensor module was made of 13 tungsten wires and they were assembled into an array type. The sensor wires whose diameter is 1 mm were placed in parallel with the incident beam, while they were placed in the perpendicular direction to the incident beam in the conventional method. Thus this monitor has a linear actuator to scan whole beam profile, which moves the sensor module from the dormant to measurement position or vice versa. The current output of each sensor was amplified using a trans-resistance amplifier which can measure input current in the range of 1 pA. The amplifier had a resolution of ~ 20 fA, the temperature drift of ~0.5 pA/°C, and the signal-to-noise ratio greater than 80 dB. Various test results of the amplifier and sensor module assembly are given in this paper. The measured current profiles of cyclotron beam line at KIRAMS are also given.
TUPLS134	Managing the Quality Assurance Documentation of Accelerator Components Using an EDMS	quadrupole, DESY, XFEL, PETRA	1819
	L. Hagge, J. Buerger, J.A. Dammann, J. Kreutzkamp, K. Lappe DESY, Hamburg
	Quality assurance (QA) documents are often collected locally on a per-component basis by the manufacturing teams, while project engineers require global evaluations of the QA documents e.g. for production control or during installation and commissioning of the machine. DESY is using an Engineering Data Management System (EDMS) for supporting and unifying the QA documentation of different accelerator components. The EDMS provides dedicated user interfaces which are optimized for the needs of the specific engineering teams which are working on the components (including industrial manufacturers), and at the same time integrates the QA documents into a central database for further overall analysis and applications. The poster introduces the general structure of QA procedures, describes the benefits of using an EDMS for QA documentation and describes examples from different applications at XFEL and PETRA III.