Undulator Cavity BPM System Status May 14, 2019 Undulator Cavity BPM System Status

In-Tunnel Electronics Block Diagram

X-Band Cavity BPM Development Five X-Band Cavity BPM built and tested Two qualified vendors for machined parts Brazing procedure optimized to preserve tune Tuning and testing procedures generated

Prototype BPMs for 3-BPM test 4 BPMs built and tested to support 3-BPM testing Design and technology mature

BPM Simulations Cavity BPMs simulated in Microwave Studio, HFSS and Mafia Test data indicates good agreement between simulated model and measured BPMs Port 1 Port 4 Port 2 Port 3 X-Port Y-Port Vertical dipole mode Monopole mode

Prototype BPMs for 3-BPM test

Cavity Cold Test Critical tuning experience gained Test fixtures designed and built for tuning before brazing Post braze tuning minimized by pre-tuning and controlling braze process Good correlation between cold test and beam test

Tuning Pins Tuning pins improve performance and production yield Tuning pins prototyped and tested Tuning pin simulations verify measurements

Cold Test After Brazing and Tuning Serial # Dipole Freq. (GHz) Loaded Q Monopole Design Goal 11.384 3550 3695 R/0 3310 3437 001 11.374 3250 11.382 3372 002 11.376 3500 11.383 3436 003 11.377 3371 11.400 3200

Brazing Problems Tuning Pins difficult to braze. New braze fixtures designed and built End Cap design being evaluated Problems with window leaks Window plating suspected

Cavity BPM Development R&D phase of near completion Testing phase II expected completed by end of July Entering production phase

Receiver Development X-Band down-converter developed from existing Miteq product Modified to meet LCLS requirements 3 channel receiver with common LO 4 first article packaged receivers delivered and presently being tested

X-Band Receiver System Features Input RF Power Surge Limiters Input DC power regulation High/Low gain feature (28/0dB) to extend dynamic range Integrated self-test Multi-mode operation with phase locked LO to control system or free-run mode

X-Band Receiver Packaging Design Receiver enclosure 12.5 wide by 15 deep by 2.5 thick (inches) with integral heat sink Houses input filters local oscillator and down-converter 3-WR75 Inputs, 3-type “N” outputs, LO ref. input Type “N”, power and control cable

X-Band Receiver Chassis Line Replaceable Unit (LRU) design Local status interface indicators for power, operational mode, gain range, self-test Integral heat sink and EMI chassis design

Dynamic Range Testing

Frequency Response Sweep

Receiver Electronics Development R&D phase of near completion Testing phase II expected completed by end of July Test fixtures developed Entering production phase

BPM Testing Non-Vacuum Single BPM cold test unit complete 04/06 (Phase I) test in APS Injector Test Stand complete 09/06 (Phase II) 3-BPM test in APS LEUTL Complete test matrix to prove compliance to specification Testing phase II expected completed by end of July

LEUTL 3-BPM Test PC gun installed and LEUTL tunnel commissioned PC gun beam 325 MeV (400 pC) to dump 33 Hor. and 23 Vert. micron normalized emittance Compressed beam 1 ps bunch length

In-Tunnel Progress 2-axis translation stage installed and tested provide sub-micron controllable horizontal and vertical motion Multiple experiments presently conducted to verify operation Testing ongoing

Electronics Stability Testing

Single BPM Test

3-BPM Test Apparent X resolution 8 microns rms Courtesy Steve Smith

Undulator System Layout Beam X-band receiver LRU

Production Phase Production of 2 BPMs for LTU 11/07 Production of 6 BPMs for undulator 11/07 Production of 10 BPMs for undulator 01/08 Production of 11 BPMs for undulator 02/08 Production of 7 BPMs for undulator 03/08 Spares 4 BPMs 03/08

Summary X-Band Cavity BPM Development Nearly Complete 4 Cavity BPM built and tested Machining and braze critical tasks identified BPM phase ll testing expected complete July 07 Production procurement ongoing Receiver Prototype Development Nearly Complete First 4 prototypes assembled and tested with good results 3-BPM testing prototypes incorporate receiver, local oscillator and filter first article packaging Test Qualification Collaborating with SLAC to test and qualify Qualifying system with the same ADC (PAD) as SLAC LINAC BPM upgrade Testing is ongoing at this time with promising results Entering Production phase