NSLS-II Beam Position Monitor System Om Singh Instrumentation

NSLS-II Beam Position Monitor System Om Singh Instrumentation Group Leader ASAC Review - October 22 -23, 2009 1 BROOKHAVEN SCIENCE

Outline • Injector RF BPM Button • Storage Ring RF BPM Button • RF BPM Electronics • Photon BPM 2 BROOKHAVEN SCIENCE

Injector RF BPM buttons • Resolution Requirement • Simulation shows 15 mm diameter bu 1. High charge (15 n. C) 30 microns will meet resolution requirement 2. Low charge (0. 05 n. C) 300 microns electronics - commercial or in-h • BPM Injection BPMs Gun/ Linac LTB Transport BTS Transport Booster Beam pipe Qty dimension Cal Factor Kx, Ky *Peak Voltage @ PUE *Power level after 10 MHz BW filter 3 40 mm cir. 15 3. 2 V -13 d. Bm 5 40 mm cir. 15 3. 2 V -13 d. Bm 1 40 x 90 mm 18 2. 8 V -14 d. Bm 6 25 x 40 mm 11 4. 4 V -10 d. Bm 24 25 x 40 mm 11 4. 4 V -10 d. Bm Pinayev * Multi-bunch mode with 0. 1 n. C per bunch; = 15 ps; Cb = 2. 5 p. F Padraz o 3 4 BROOKHAVEN SCIENCE

Injector RF BPM buttons - continued • Sensitivity and power level calculations completed • 15 mm dia RF buttons assembly design in progress • Completion schedule – 1 st Article 6/2010; Pinayev Padraz o Kosciuk Production 6/2011 40 x 90 mm LTB beampipe 40 x 40 mm LTB beampipe 4 BROOKHAVEN SCIENCE

SR RF BPMs Location in a Cell 1 3 2 1 2 3 4 5 RF BPM Types 6 Qty 1. Multi-Pole Chamber RF BPMs (LA) 6 per cell = Total 180 2. Insertion Device Chamber RF 2 or 3 per BPMs (SA) ID 5 BROOKHAVEN SCIENCE

RF Cable Junction Box – SR Tunnel • Junction box – to interconnect and to house passive components • Si. O 2 cables used @ buttons • LMR-240 used from box to rack Della. Penn a Kosciuk 6 BROOKHAVEN SCIENCE

SR RF BPM Button Design – Trapped Mode Optimization NSLS-II button geometry 7 mm dia; 16 mm hor Freq of trapped mode sep (r=3. 5 mm) Bunch Gaussian BW ( =15 psec) Relative voltage induced I. Pinayev, A. Blednykh, P. Cameron, B. Bacha 7 BROOKHAVEN SCIENCE

SR RF BPM Button Design – Heating Optimization FEA Thermal Simulation 1 st Article Unit Kosciuk Cameron 8 BROOKHAVEN SCIENCE

SR RF BPM Buttons Procurement Status • Acquisition Status for large aperture (BLA) buttons (7 mm dia) • • First articles received and acceptance tests completed August 09 Contract for 460 pieces awarded Sep 2009 Production schedule Dec 2009 – June 2010 Acquisition Status for small aperture (BSA) buttons (4 mm dia) • • • Engineering drawing, Specification, and SOW complete – Mar 2010 P. Contract Awarded - Apr 2010; Receive first articles – Jul Camer 2010 on Acceptance testing, go-ahead to vendor for production – 9 BROOKHAVEN SCIENCE

Resonance Modes in Multipole Chamber (3. 05 m) Resonance modes can reside inside or too ose to BPM pass band frequency – not good Measurement Set-up 440 640 BPM Frequency Pass Band 492 – 508 MHz Resonance Modes could effect BPM performance and requires to be suppressed or moved out of BPM band Blednyk h Hseuh Ferreira Bacha RF Shields • Use RF shield installed with modified NEG carriers in the antechamber • Shield located 147 mm from beam center – away from SR • Shield 500 mm long with 300 mm spacing – shifts Fo to > 530 10 BROOKHAVEN SCIENCE

RF BPM ELECTRONICS Ø 2/2009 – Completed evaluation of Libera, Bergoz and APS BPM electronics. Libera meets NSLS-II baseline technical requirements Ø 4/2009 - Shifted to evaluate other requirements - exposed several issues i. Utilizes ~10 year old Virtex-2 FPGA technology - Virtex-6 is current ii. Insufficient capability for future application software – No room to grow iii. Cumbersome to manage future upgrades – FPGA source not given to NSLS-II iv. Limited Itech support for a quick response at Brookhaven – Located in Slovenia v. AFE Crossbar switching improves drift compensation, but adds complications for TBT and fast orbit feedback data. vi. Expensive - $13, 500 each (NSLS-II qty – 250) Ø 6/2009 – Attended Libera User Workshop at ESRF – mixed responses Ø 7/2009 – Motivated to evaluate an in-house BPM development 11 & production BROOKHAVEN SCIENCE

NSLS-II RF BPM In-house Design Plan – 7/2009 • Objective § Design and build in-house RF BPM’s for the Injection system and Storage Ring • Development Approach • Challenges § Aggressive schedule § SR Stability Requirements § SR Resolution Requirements • BPM Development Team § K. Vetter – § Multi-phase development • A. Della. Penna § Parallel development of AFE and • J. De. Long DFE • K. Ha § System Integration Testing and • Y. Hu Analysis • B. Kosciuk § Beam Test • J. Mead – BNL Instrumentation § Iterate for performance • S. Orban optimization • I. Pinayev § Dedicated Lab BROOKHAVEN SCIENCE 12 • Y. Tian

RF BPM Prototype - Physical Architecture (7/2009) High Speed, Impedance Controlled Differential Connector (LVDS) A BPF ADC Fixed B BPF ADC C BPF ADC D BPF ADC Calibration Point DSP + Raw Data First Turn T-B-T (10 KHz) Post Mortem Raw Data Slow Acquisition Inter. Lock Cal Control Interface Virtex-5 ADC Slow Data & Control Timin g Inter. Loc k Memory Clock DDR 2 SDRAM AFE FOFB DFE - Fixed - Under Sampling (initial proposed concept) Point Digital Signal Processing, Position calculation, PU Linearization - Factory Calibration (gain, temperature)Embedded Eventlink - Digitally Assisted AFE Calibration - Dynamic Calibration ü Factory Calibration – Remove Systematic Errors ü Dynamic Calibration – Remove Drift - Communication Links 13 BROOKHAVEN SCIENCE

Spectrum with Calibration Duplexer § Frequency multiplex RF Signal from pickup with RF Duplexer Theoretical Response Cal Tone Passban d continuous calibration tone. § Cal tone tracks RF Signal passband Insertion Loss by virtue of Monolithic Distributed design Target Rejection = 60 d. B RF Signal § Currently working with vendors to optimize filter Passband response, cost, and complexity üBessel/Gaussian 5 th-order Transitional filter (e. g Gaussian to -3/-6 d. B, Chebychev) under investigation for RF Signal passband üBessel, Butterworth and Chebychev response under investigation for Pilot-Tone passband 14 K. Vett BROOKHAVEN SCIENCE

Calibration Concept #1 - (Out-of-Band Pilot Tone via RF Duplexer) In-Tunnel hardware • Benefits ü Continuous Real-Time Calibration ü No perturbations to signal path 0. 0007 d. B Gain Balance Required ü Inherent Built-In Test for 200 nm offset @ k=10 mm 15 K. Vett er BROOKHAVEN SCIENCE

RF BPM Prototype Development Plan (7/2009) AFE DFE Beam Test 16 BROOKHAVEN SCIENCE

RF BPM Development Status – 10/2009 • • • Started RF BPM development – July 2009 RF BPM architecture in mature stage (next slide) DFE Board Schematic 90% complete. Board layout to begin this month ü 1 -month ahead of schedule Developing Requirements for custom RF Duplexer - Complete in November 2009 ADC Evaluation started. Evaluating performance of four Candidate ADCs RF BPM Thermal Analysis started • Highly desirable to have passive cooling (no fans) • Take advantage of the temperature control rack capable of ± 0. 1°C stability • Establish convective heat transfer coefficient inside the rack via accurate FEA study. • With accurate boundary conditions and preliminary board layout, predict operating temperatures of FPGA and other electronic components. Start AFE layout in December 2009 Preliminary chassis layout in advance stage – more later Power supply requirements 85% complete RF BPM Development space – Lab acquired; Test equipment K. BROOKHAVEN SCIENCE 17 procurement in progress

NSLS-II RF BPM Architecture – 10/2009 ü ü ü ü Bandpass Sampling 16 b ADCs Sample Rate ~ 113 MHz Xilinx Virtex-5 FOFB @ 10 KHz SA @ 10 Hz Embedded PC with Linux OS Embedded Floating-Pt coprocessor Embedded Event. Link 128 Mbyte DDR 2 Active Calibration for long-term drift Factory Calibration to remove systematic errors DFE platform adaptable to other NSLS-2 applications 18 BROOKHAVEN SCIENCE

NSLS-II BPM Mechanical Concept DFE AFE Modular Approach RF SMA - separate AFE, DFE Connectors Triggers SFP Communication Ports Same chassis as Power Supply Interface (PSI), PS Regulator Module, and Cell Controller 19 Kosciu k Orban Tian BROOKHAVEN SCIENCE

NSLS-II RF BPM Electronics Schedule – 10/2009 20 BROOKHAVEN SCIENCE

X-BPM Concept Photo Emission Type XBPM assembly B. Translation stages Kosci uk P. Ilinski Invar based High stability stand 21 BROOKHAVEN SCIENCE

Typical Front End Configuration – XBPMs Shown Ratchet Wall Collimator Dual Safety Fast Gate Shutters Shrama Doom Valve Photon Shutter XBPM 1 Fixed Aperture Mask Slow Gate Valve Bending Magnet photon shutter Ion Pumps with TSPs Lead Shield XBPM 2 Safety Shutter Collimato r Ion Pump X-Y Slits Collimat or 22 22 Ion Pump with TSP BROOKHAVEN SCIENCE

SUMMARY • Injector schedule RF button design in progress. Button delivery on • SR RF buttons – §Design completed including heating optimization § 1 st article accepted successfully; Production delivery starts 12/2009 • Resonance modes solution in progress; SR shield review held; recommendations are being evaluated • NSLS-II RF BPM Electronics – §Evaluated BPM electronics §Libera meets technical requirements, but falls short in several other areas §In-house design study in progress; prototype test with beam 4/2010 §Installation schedule will be met with in-house BPM electronics 23 BROOKHAVEN SCIENCE

Acknowledgment B. Bacha, A. Blednykh, A. Borrelli, P. Cameron, W. Cheng, L. B. Dalesio, J. De Long, P. Ilinski, A. J. Della Penna, L. Doom, M. Ferreira, G. Ganetis, W. Guo, H-C Hseuh, E. D. Johnson, B. N. Kosciuk, S. L. Kramer, S. Krinsky, F. Lincoln, C. Longo, W. Louie, J. Mead, S. Orban, D. Padrazo, I. Pinayev, J. Ricciardelli, G. Shen, S. Sharma, J. Skaritka, C. Spataro, T. Tanabe, Y. Tian, K. Vetter, W. Wilds, F. J. Willeke, L-H Yu 24 BROOKHAVEN SCIENCE

Back up slides 25 BROOKHAVEN SCIENCE

Rogue Mode Requirements - (From RF BPM Perspective) K. 26 Vett er BROOKHAVEN SCIENCE

Acceptance Testing of the 5 First Article Buttons • Dimensional verification and leak checking done at the vendor’s facility. • The following acceptance testing completed at BNL • 1. 2. Vacuum Group - leak check, bake, leak check – <2*10 -10 std. cc/sec Central Shops - dimensions verified using CMM (coordinate measuring machine) 3. Diagnostics Group • Capacitance – ~4 p. F, divided evenly between button and feedthru (one assembly shipped without buttons to permit this measurement) • Contact insertion and withdrawal force • Leakage resistance and voltage holdoff • VSWR • Trapped mode frequency (avoid the RF harmonics) and Q • Thermal response to button heating In addition, Central Shops sectioned one assembly (wire 27 BROOKHAVEN SCIENCE

Button Assembly 001, and Test Fixtures Bacha Camer on Kosciuk trapped mode frequency measurement 28 SMA contact insertion BROOKHAVEN SCIENCE force measuremen