Experience of the Spanish collaboration with TBL F. Toral on behalf of the Spanish Collaboration with TBL CERN, CTF3 Collaboration Technical Meeting, 6/5/2010

2 CIEMAT collaboration: o Quadrupole movers o TBL PETS IFIC collaboration: BPS UPC collaboration: amplifiers Outline

TBL quadrupole mover development J. Calero, J.L. Gutiérrez, E. Rodríguez, F. Toral, CIEMAT N. Chritin, S. Doebert, J. A. Rodríguez, CERN

4 Quadrupole movers Compact design High accuracy Moderate price for series production Challenges: Technical specifications:

5 Layout Horizontal actuator Vertical actuator  Actuators based on 5-phase step motors with integrated screws and electromagnetic brakes.  Precision linear guides.  Mechanical micro-switches: home position and end-of-movement detectors.

6 Series production  The series production consisted of 13 units.  It was finished in May 2009, but acceptance tests failed due to the lack of magnetic brakes.  The movers were disassembled to incorporate the brakes.  They were installed at CLEX in Autumn.

TBL PETS prototype development P. Abramian, F. de Aragon, J. Calero, D. Carrillo, A. Lara, L. Sánchez, E. Rodríguez, F. Toral, CIEMAT

8 RF design of TBL PETS Previous design 30 GHz PETS (4 waveguide extractor) Final version: 12 GHz PETS (2 waveguide extractor) Electron beam Electric field produced when electrons are “decelerated” RF optimization Power extracted

9 General layout of TBL PETS Copper rods Power extractor Vacuum port WR90 waveguide Supports Fiducials Cooling pipes

10 Copper rods production Each PETS was made of eight OFE copper rods (800 mm long). These were the most difficult parts to fabricate: profile tolerance is +/ mm and roughness R a should be better than 0.4 micron. The coupling cell is smaller: two different milling tools were necessary. Two intermediate thermal treatments for stress relaxation. Copper rod

11 Cooling pipes production

12 Waveguides

13 Power extractor Courtesy Serge Mathot, CERN

14 RF structure assembly

15 Mechanical measurements Before shims After shims Nominal distance between the back sides of opposite rods is mm

16 PETS RF measurement bench

17 PETS tank assembly (I)

18 PETS tank assembly (II)

19 Single rod RF test bench A special test bench has been designed to do RF measurements on each rod It consists of two side blocks put together with a single PETS bar in order to create inside a mode with same properties as the decelerating mode Results agree with 3-D mechanical measurements Mode TE 10 HFSS model E field and probe Phase S31 vs position

20 Power extractor RF measurements (I) Input Coupler Input Coupler Coax to WR90 Power Extractor AbsorberAbsorber AbsorberAbsorber Port1 Port4 Port2 Port3 Choke AbsorberAbsorber Coax to WR90

21 Power extractor RF measurements (II) No visible change in S11 when removing wire or absorber from port 4 Both S21 and S31 are aprox. -3dB at 12 GHz S11 HFSS Simulation S11 Experimental results

22 PETS RF measurement bench A special test bench was designed to measure the assembly of rods A coaxial antenna was used to measure the field through the slots between the rods

23 PETS dispersion curve MHz50 MHz detuning In the worst case, a 10% loss of extracted power is expected

24 TBL PETS commissioning RF power produced RF pulse phase Beam current along the line Courtesy Steffen Doebert, CERN  up to 10 A through PETS  20 MW max produced at a pulse length of 280 ns  Power production consistent assuming a form factor of 0.9

25 PETS tank at CLEX (spring 2009) BPM Courtesy Steffen Doebert, CERN Mover Quadrupole PETS tank

26 Repair of leak (April 2010) Two cooling circuits leaked. The most likely origin of the problem was the aluminum Helicoflex gasket. When the tank was opened, a very strong corrosion was observed. The aluminium gaskets are replaced by copper ones (custom machined). The tank was opened and closed in only two days!

27 Series production of TBL PETS Eight TBL PETS are under production. CERN has reviewed the prototype design made at CIEMAT. Three will be assembled at CIEMAT, and five at CERN. CIEMAT takes care of three vacuum tanks, the waveguides and cooling circuits for the whole series. Production of waveguides and cooling pipes is ongoing. The first tank is already at home.

28 BPS Status Beam Position Monitors for TBL IFIC CTF3 Team: C. Blanch Gutiérrez J.V. Civera Navarrete A. Faus Golfe J.J. García Garrigós

29 The TBL is designed to study and validate the drive beam stability during deceleration in CTF3. The TBL consists of a series of FODO lattice cells and a diagnostic section at the beginning and end of the line. Each cell is comprised of a quadrupole, a BPM (labeled as BPS) and a Power Extraction and Transfer Structure (PETS). 3D View of a TBL cell with the PETS tanks, the BPS’s and the quadrupoles 2.25 cm TBL beam time structure PCB with H and V Inductive sensors BPS: Beam Position Monitors for TBL BPS unit. Type: Inductive Pick-up (IPU)

30 BPS Prototypes, Series Production and Calibration Tests  A set of two BPS prototypes labeled as BPS1 and BPS2 with its associated electronics has been designed, constructed and characterized by the IFIC team with the collaboration of the CTF3 team at CERN (May 2008). BPS1 and its support installed in the TBL line First measurements of the BPS1 with beam in the TBL line (OASIS Viewer)  BPS1, jointly with its support and its amplifier, was installed successfully at TBL; BPS2 remained at IFIC as spare (July 2008).  BPS1 first beam measurements were carried out (August 2008). Wire set-up for BPS prototype characterization tests at CERN Labs Low-frequency wire set-up 3D view design Control and DAQ equipment for all the setup signals Overview of the new wire test bench for BPS series characterization tests at IFIC labs  A new wire test bench for BPS series characterization tests was designed and built at IFIC (March 2009).  The BPS series production (15 units) started at IFIC labs (November 2008). BPS: Beam Position Monitors for TBL

31 BPS Prototypes, Series Production and Calibration Tests (cont’d)  Tests for BPS2 and BPS3 carried out with the new wire set- up at IFIC. Less than 50um accuracy (March 2009).  Two more BPS units were delivered and installed, BPS2 and BPS3 both with new improved electronic PCBs (May 2009).  14 BPS units construction and assembly process finished (August 2009).  A LabVIEW application (SensAT v1.0) is developed to automatize the BPS series characterization tests in the new wire test bench (September 2009).  The 14 BPS units tests finishes, they are delivered to CERN and finally installed in TBL (October 2009).  All the BPS are validated successfully in TBL after first calibration tests (October 2009). All BPS units jointly with its supports and amplifiers installed in TBL (CLEX area, CERN). Calibration signals test in TBL shows good BPS performance with flat-top pulse response. BPS: Beam Position Monitors for TBL

32 BPS: Beam Position Monitors for TBL Ongoing & Future Tasks on BPS  Data Analysis of the BPS series characterization tests to obtain the final specific working parameters for each BPS monitor (Sensitivity, Offsets, Bandwidth, Accuracy,…).  Beam tests in TBL for the full installed BPS series. Measurements at high beam current (30A) and checking of the BPS’ resolution and performances. SensAT v1.0 front-panel (LabVIEW) to automatize the DAQ in the wire testbench for the BPS series characterization tests.  All the work carried out on BPS’s will be comprised on the PhD Thesis of J.J. García- Garrigós (IFIC).  High Frequency Test on spare BPS to check the limitation of the BPS longitudinal impedance beyond bunching frequency (12GHz). Simulation and Fabrication of the HF coaxial testbench. Simulation SW: FEST3D (in col. with B. Gimeno. Dep. Fisica Aplicada, U. of Valencia) -40dB High frequency coaxial structure design and its simulation results for 0-30GHz (S11, reflection parameter)  In Conclusion, 16 BPS + 1 spare units (with its alignment supports) has been designed, constructed and tested for TBL.

- BPS Amplifiers for TBL - H V ∆H ∆V ∑ Inductive pick-up AFE: Analog Front-end Electronics DIGITIZER The ‘UPC team’: Yuri Koubychine Antoni Gelonch Gabriel Montoro

- BPS Amplifiers for TBL - Most important amplifier specifications BPS-Amplifier interconnection: according to IFIC specifications and measurements (signal levels, droop compensation, …). Amplifier-Digitizer interconnection: according to LAPP specifications (cable type, signal levels, differential signals, control signals, …). 100 MHz BW (200 MHz if possible). Rad-hard tolerant components (100 Krads): TI THS4508.

- BPS Amplifiers for TBL - Some amplifier testings Delta channel freq. response Sigma channel freq. responseS11 parameter of one input channel One amplifier unit + box

- BPS Amplifiers for TBL - The amplifier series: present and future 16 amplifier units (and 96 BPS_to_amplifer cables) have been installed in TBL. Some calibration and beam tests have been performed: some problems were detected and some of these were solved. The future: to continue testing the 16 “Amplifiers + BPS + Digitizer” with beam in TBL.

37 Conclusions The Spanish collaboration with TBL consists of the quadrupole movers, PETS, BPS and their amplifiers. The balance is very positive: new capabilities have been created in the Spanish Institutes which are being also used for other facilities Spanish companies have produced these type of devices for first time in our country and now they are in the position to participate in the call for tenders by CERN Tests with beam are scheduled for 2010.