instrumentation progress

1 BROOKHAVEN SCIENCE ASSOCIATES

Instrumentation Progress

Om SinghInstrumentation Group Leader

ASAC Review – October, 14-15, 2010


Outline

• NSLS-II Diagnostics Overview

• Injector Instrumentation Update

• Storage Ring Instrumentation Update

• Summary


NSLS-II Diagnostics SystemsSystems NSLS-II Vendor

SR BTS LTB Booster Linac GunRF BPM – Single Pass 8 6 5*RF BPM – TBT & Stored Beam 180 37*ID RF BPM 2 or 3 per IDFill Pattern Monitor (WCM) 3 2Fill Pattern Monitor (FCT or SL) 1 2 2 1Faraday Cup 1 2 1Beam Charge Monitor (ICT) 2 2Fluorescent / OTR Screen 3 9 9 6 6Energy Slit 1 1Photon BPMs 1 or 2 per IDStored Beam monitor (DCCT) 1 1Tune Monitor 1 1Top-Off Monitor 2X-Ray Diagnostics (BM-A Source) 1X-Ray Diagnostics (3PW Source) 1VSLM Diagnostics (BM-B Source) 1 1Transverse Feedback (H & V) 1+1Beam Loss Monitors TBDBeam Scrapers ( H & V) 3+2

*NSLS-II provides BPM Electronics


Injector Diagnostics Systems Resolution Requirement

Parameters/ Subsystems

Conditions Vertical Horizontal

Injector single bunch single shot

0.05 nC charge

300 μm rms

300 μm rms

0.50 nC charge 30 μm rms 30 μm rms Injector multi bunch single shot (80-150 bunches;)

15 nC charge 10 μm rms 10 μm rms

• Linac rep rate = 10 Hz;

• Booster ramp rate = 1 Hz;

• Booster revolution frequency = 1.98 MHz;

• Storage ring revolution frequency = 378 kHz;

• Bunch spacing = ~ 2ns

• Bunch length = 15 – 30 ps

Element Function ResolutionFlag (OTR+YAG:Ce) Energy spread, beam size and position 30/50 μm

Fast current transformer Fill pattern monitor ~1 pC

Integrating current transformer Beam charge, injection efficiency ~ 5 pC

BPM (40 mm round) Beam position 30 μm

BPM (40×90 mm elliptical) Beam position 30 μm

Energy slit Beam energy spread n/a

Faraday cup Beam charge


Injector Diagnostics Status – LTB Transport Part 1 (Linac Commissioning)

D. PadrazoB. Kosciuk I. PinayevK. VetterJ. DellaPenna

6 FLAGS

RF Buttons15 mm Dia.

1 FCT & 1 ICT

1 Energy Slit

2 Faraday Cups 3 BPM electronics

2 Circular ChamberFlange Assembly

1 Elliptical ChamberFlange Assembly

LTB - Part 1Inside Linac Vault


Layout of Injection Straight Diagnostics

• Two OTR Flags to observe beam position and shape; Flag 1 after septum; and Flag 2 after the first turn

• Two BPMs (1&2) to observe circulating and bumped (12 mm) stored beam; One BPM (septum) to observe injected beam (25 mm)

• One BPM in the transfer line between DC and pulsed septa for measuring of position of injected beam

Flag 1

Flag 2 BPM (Septum)BPM 1 BPM 2

TL BPM


Diagnostics Beamlines Two X-ray synchrotron imaging beamlines with PH camera & CR lenses

1st BM source point in Cell 22 – to measure emittance 3PW source point in Cell 22 – to measure energy spread All optical components are inside tunnel

One Visible synchrotron imaging beamline 2nd BM source point in Cell 30 – to measure temporal and spatial beam properties Location (just downstream of injection straight) - ideal to assist injector tuning A shed for experimental optical table located just outside ratchet wall

Design review held in July, 2010 Comment – “Proposed design for all beamlines is effective to meet all critical

goals for both commissioning and long-term success of the facility”

Status Final design of beam line components in last stage; followed with procurement for

optical components


Mitigation of Resonance Modes in Multipole Chamber – RF Shields

Resonance modesWith no rf shield

Blednykh; FerreiraHseuh; KosciukBlednykh; FerreiraHseuh; Kosciuk

• S6 upstream shifts modes to > 800 MHz

S2

S4

S6

500 MHz

Flexible BeCu RF fingers with 50% of opening space

• S6 downstream does not shift out of band but can optimize modes location

•S2 & S4 shifts modes to > 800 MHz


BPM Rack Connections

The spacing between the type-N bulkhead connectors is 1.50” x 1.75” which is adequate to make the connections manually.

B.Kosciuk

Bulkhead Type N Connectors

RG223 Cables


RF Cable Junction Box – SR Tunnel

• Passive RF Box – Pilot Tone Injection

• SiO2 cables – Button to RF Box

• LMR-240 – RF Box to Electronics Rack

VetterKosciuk

Passive RF Box with Diplexer, couplers,

and Isolator

Pursuing use of Stripline coupler in

Junction Box in place of Diplexer approach to

inject In-Band Cal Tone

Carbon fiber stand


Multi Pole SR RF BPM - Optimization

Optimized RF Button

•Mechanical thermal and vibration stability < 0.2 um

•Electronic thermal stability < 0.2 um

•Electronics AC stability < 0.2 um

NSLS-II RF BPM (Prototype)

RF spring – to mitigate HOM issues

AFE

DFE


Analysis of Heat Dissipation in the BPM Button

• For 2 mm thick molybdenum button only 14% of beam deposited energy is dissipated in the button1

• The diameter of the button was chosen to place trapped mode frequency off the RF harmonic and power dissipated in the button is a sum of contributions from the individual bunches

• For 300 mA beam with 15 ps r.m.s. bunch duration the loss factor is 5 mV/pC and power dissipated in the each button will be 31 mW

• For 500 mA beam with 30 ps r.m.s. bunch duration the loss factor is 0.6 mV/pC and power dissipated in the each button will be 10 mW

1I. Pinayev and A. Blednykh, “Evaluation of Heat Dissipation in the BPM Buttons”, PAC’09

0 100 200 300 400 500 600-0.03

-0.02

-0.01

0

0.01

0.02

0.03

s, mm

W, V

0 5 10 15 20 25 30 350

10

20

30

40

50

60

70

Frequency, GHz

ReZ

lon

g,

hTIkP revlossloss20

GDFIDL simulations, A. Blednykh

ASAC October 09 review Comment - “Concerning the BPM buttons, the committee recommends that calculations of the high frequency RF power deposited in the button geometry should be performed using electromagnetic codes as GDFIDEL, to have an accurate estimate of the heating of the button.”


RF BPM Electronics - Status

ASAC October 2009 review comment – Presented an in-house BPM development plan From final report - “The committee recognizes that an alternative to the

commercial electronics can be developed but will need time and resources to achieve similar or better performance. It is the opinion of the committee that the project probably has the time to develop a new system if highly skilled and motivated people embark immediately on the project.”

BPM Development Progress – in span of 12 months Assembled a highly motivated team – July 2009 Developed BPM system architecture in multi-group collaboration environment to

provide high BPM performance & optimized control interface – Oct, 2009 Started parallel effort to design AFE & DFE hardware and to develop DSP

algorithms & control system communication interface – Dec 2009. Built and tested 7 AFEs and 10 DFEs modules with 100% yield; Built and tested 7

BPM systems and 3 Cell controllers – May, 2010 Performed beam test at ALS, measuring TBT beam stability of 400 nm – July

2010 Held a BPM design review with favorable comments – August, 2010


BPM Design Review Agenda – August, 2010

9:00 AM Welcome and Charge E. Johnson9:15 AM BPM requirements and status O. Singh9:40 AM BPM Architecture (Front-End, AFE, Signal Processing) K. Vetter

10:25 AM Coffee10:40 AM DFE Architecture & FPGA Digital Signal Processing J. Mead11:25 AM BPM Test Results K. Vetter

12:10 PM Lunch12:55 PM Controls Interface & Embedded Processing K. Ha1:40 PM BPM Integration Architecture J. Delong2:25 PM Manufacturability and Schedule K. Vetter

3:10 PM Coffee

3:25 PM BPM Lab Tour - Stability Demo (902 lower level) O. Singh

Glenn Decker (APS) - Chair [email protected] Chin (ALS) [email protected] Lenkszus (APS) [email protected] Michnoff (BNL) [email protected] Sebek (SPEAR3) [email protected]


BPM Lab test - TbT Position Results

Input Signal (PG = 36 dB)

SNR ~ 55 dB

~400 nm

resolution

J. Mead


ALS Beam Test “2-Cam Fill Pattern”

Raw Beam on far end of cable

550MHz LPF followed by 10MHz Bessel 5th-order BPF. This signal is split 4-ways and fed into NSLS-II RF BPM

The rms noise on the TBT X and Y position = ~ 400nm


BPM Electronics Design Review Comments

• “Develop the interfaces to the control system to support as-yet unspecified high level physics and orbit control applications” • Broke down review comments into categories; in process of generating a

working document for AP, Controls, Diagnostics groups. This working document will be integrated into an overall schedule.

• “The use of pilot tone to correct for channel-to-channel variation is as yet undemonstrated, but will need to be validated in order to meet long term drift requirement” • In-band pilot tone is planned for injector BPM – simpler filter box design (no

diplexer); Brevfreq = 5 times SRrevfreq makes DSP processing easier. • Out of band pilot tone is planned for SR BPM; prototype system to be ready

to test in 6-9 months


BPM Electronics Design Review Comments - Continued

• “Need to address following issues as soon as possible”• “Eliminate noise observed due to power supply” –

• Problem solved - Replaced linear regulator from Linear Technology device to a Micrel device. Also, added filters.

• “The glitch problem needs to be understood and remedied as soon as possible “

• Early result indicates that by changing rf amplifier from Hittite to Analog Device mitigates the transient issue. Test data with 2 channels has been collected for 17 hours with no glitch. Further tests are underway.

• “The processing gain discrepancy, where the rms variation of signal readings is not reduced as the filter bandwidth is reduced, needs to be understood.”

• We are analyzing the problem by having to store and extract 1M turns of data that enables high resolution FFT’s to hunt down perturbations in the sub-hertz regime.


Schedule


Injector RF BPM Schedule

BPM Receivers availableat least 3 months prior

to System Integration Start


Storage Ring RF BPM Schedule

After 12-week lag for manufacturing startup,

BPM’s are fed in groups of (8) units into NSLS-II System Integration.

After 12-week lag for manufacturing startup,

BPM’s are fed in groups of (8) units into NSLS-II System Integration.

All BPM’s installed and tested including system integration 3 mo prior to start of commissioning

All BPM’s installed and tested including system integration 3 mo prior to start of commissioning


Remaining Development Schedule


SUMMARY

• Diagnostics & Instrumentation systems are in final design or in procurement stage

• Injector diagnostics installation is on schedule for injection machine commissioning

• Diagnostics beamline design in advance stage; procurements to follow

• SR RF buttons in production; Injector RF buttons in 1st article acceptance stage

• Tunnel work planning in progress for BPM RF junction boxes and cable layout

•Resonance modes solution – RF Shield Production units in hand; installation in progress.

• RF BPM Electronics

In-house design at advance stage – AFE & DFE spin 2 work in progress

1st article – injector BPMs 3/1/2011

1st article – SR BPMs 8/1/2011

Production schedule meets system integration and commissioning dates

• Installation, system integration and commissioning schedule have been optimized


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, Y. Hu, E.D. Johnson, B.N. Kosciuk, S.L. Kramer, S. Krinsky, F. Lincoln, C. Longo, W. Louie, M. Maggipinto, J. Mead, A. Munoz, 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


Back up slides


AFE Development Status (2/2010)

• Completed simulation of receiver

• Completed laboratory characterization of four ADC’s. Selected Linear Technology LTC2208

• Completed laboratory characterization of BPM receiver (single channel)

• Laboratory results confirm compliance with Injector and SR operating requirements based on simulated signal estimates.

• Schematic 80% complete• Anticipate board layout

complete by end of February

BPM Receiver RF Simulation

Receiver Functional Receiver Diagram

AT1 BankAT2 Bank

•AFE Design meets BPM resolution requirement for both injector and storage ring.

•Maximum SNR achieved > 60 dB

•At nominal operating conditions, expected resolutions - • Single pass resolution < 5 um • Stored beam resolution < 100 nm •Operational dynamic range of

receiver > 100dBNominal Operating

Conditions (500mA)= -15dBm

27 BROOKHAVEN SCIENCE ASSOCIATES29/06/2007 27

Types of measurement requirement – SR BPM

Type Application Rate BW Data flow

Raw Data Diagnostics117 MHz

10 MHz On demand

Turn-by-turnTune measurement,

betatron amplitude and phase

378 kHz 169 kHz On demand

Slow Acquisition

Slow orbit feedback, response matrix measurement

10 Hz 2 Hz On demand

Fast

AcquisitionFast orbit feedback 10 kHz 2 kHz Continuous


Injector RF BPM Schedule


6543

21231

SR BPMs and Correctors

Fast correctors (Qty=3)Fast response – 2 kHzWeak strength – 15 μradUtilized for –•Fast orbit feedback

Slow correctors (Qty=6)Slow response – 2 HzStrong strength – 800 μradUtilized for –•Alignment•Slow orbit feedback

BPMs

156 mm slow 100 mm slow 30 mm fast (air core)

SC SC

SCSC

SCSC

FC FC FC


SR Diagnostics Hardware Locations (Proposed)

BM - SLM 3PW PH/CRL

BM PH/CRL

Scrapers

SR Cell #X-Ray imaging (BM source) 1 22X-Ray imaging (3PW source) 1 22Visible Light Monitor (SLM) 1 30Fill Pattern Monitor (SL) 1 3Stored Beam monitor (DCCT) 1 3Tune Monitor (Striplines) 1 14Top-off Monitor 2 14Transverse Feedback (Striplines)

1 H & 1 V 12

Beam Scrapers ( 3X & 2Y) 5 30 & 1Pingers 2 20


Laser Head

Reflective Target

Mounted to Invar

Vishy

Kosciuk, Ravindranath, Bacha, Lincoln

Setup #1 with Laser

±70nm ±35nm

±0.1°C

ID RF BPM & Stand - Optimization

instrumentation progress

Documents