ATF DR BPM Upgrade

1
ATF DR BPM Upgrade

• Janice Nelson, Doug McCormick, Justin May, Andrei
  Seryi, Tonee Smith, Mark Woodley

2
Current Installation

• Button signals travel 1m to analog receivers in
  the tunnel. 15MHz IF signals fed via long-haul
  cables to Echoteks in nakanoshima.

ControlSystemDatabase via EPICS
VME CrateController (IOC)
Analog Downmix Electronics with Calibration
VME EchotekModule
BPMButtons
ATF
SLAC
FNAL
ATF

• Old calibration scheme requires separate source
  and RF distribution for each Cal tone.
• Heliax cable plant, 714 MHZ amplifiers and
  stripline hardware.

TBT data Controlavailable viaEPICS/MATLAB
3
Proposed BPM installation

• Calibration tones produced locally from LO tone,
  one tone per button, coupled into BPM from
  Downmix electronics module.

ControlSystemDatabase via EPICS
VME CrateController (IOC)
VME EchotekModule
Analog Downmix Electronics
BPMButtons
ATF
SLAC
FNAL
ATF
Calibration/control module
TBT dataavailable viaEPICS/MATLAB

• DAQ mode control moved to ATF control system
• add diagnostic displays

4
Current installation
15
13
36
11
38
9
40
7
42
5
44

• Ten BPMs in each arc
• One per FOBO cell, typically
• calibration prototype test on BPM 56

3
46
1
48
50
95
52
93
56
5
63 BPMs
17
19
20
21
31-22 (10 BPMs)
32
15
34
13
36
11
38
9
40
7
42
5
44

• One BPM per FOBO cell
• choose closest to sextupoles
• every BPM in straight sections
• Full 96 BPM installation would provide one extra
  (redundant?) monitor per FOBO cell

3
46
1
48
50
95
52
93
54
91
56
89
58
87
60
85
62
83
64
66-80 (15 BPMs)
81
6
63 BPMs
17
19
20
21
31-22 (10 BPMs)
32
15
34
13
36
11
38
9
40
7
42
5
44

• 4 VME crates

3
46

• LO distributed from each crate

1
48

• DC fused distribution from each hut

50
95
52
93
54
91
56
89
58
87
60
85
62
83
64
66-80 (15 BPMs)
81
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Changes to installation

• Four VME crates, one in each RF hut
• 1 IOC, 1 timing module, 8 Echoteks in each
• 12 Echoteks each for full 96 BPMs
• ADC, DIO, serial communication in one crate
• LO and DC distribution
• each VME crate (4) to provide an LO source
• high-power amplifier in each RF hut, split in
  tunnel between two 8-way splitters (straight and
  arc)
• DC source with fused distribution panel in each
  RF hut, individual supply to each BPM
• New enclosures
• calibration/control module isolated from analog
  receiver
• smaller boards, smaller enclosure (for downmix)
• two 2-channel boards (one BPM) per box
• adequate isolation has been demonstrated with
  boards back-to-back

high power LO amps are of the same model which
currently supplies the whole 20-BPM installation
throughout the whole ring. Should provide
adequate overhead for the additional 3dBm needed
for the cal system. bulk of cost of the DC
distribution in this scheme is the 63(/96)
individual long runs of heavy gauge wire pairs.
Some possible economy in supplying 2, 3, or 4
BPMs from one fused pair, with resultant decrease
in reliability.
8
Analog electronics

• Analog downmix electronics are largely unchanged,
  except for the following additions
• Digital step attenuator (0-28 dB, 4 dB steps) at
  input
• on-board temperature sensor and voltage monitor
• directional coupler for calibration tone (under
  test)
• 3 dB splitter in LO line (for calibration system)
• and subtractions
• manual switch for RF amplifier gain setting
  (remote only)
• on-board Cal amplifier (not used, cross-talk too
  great)
• and changes
• smaller board
• improved match into power meters
• two components upgraded to newer models

DSA added to address saturation issues, already
on the edge at one bunch 1e10. Small additional
attenuation added to help alleviate ringing
between button and filter (mismatch-based) sensors
readback
8
9
Analog Downmix Cal/Control module
Text
10
In Progress

• Testing the new additions
• Hittite step attenuator
• SMT directional coupler
• Updating schematic
• Developing new component schematics
• Adding new/deleting old components
• Shrinking board layout
• Ordering parts for prototype
• 95 stock components
• bandpass filters (Lorch Microwave) historically
  have long lead time. Possibly have 2-4 on hand.
• PCB layout, manufacture, and assembly
• Bench test at SLAC

10
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Cost
final prototype 63 BPMs 96 BPMs
Analog electronics 5000 65000 95000
enclosures hardware 200 3500 5000
LO distribution n/a 10500 15000
DC distribution n/a 30000 45000
total 5200 109000 160000
12
The Plan

• Build prototype boards for testing one BPM in
  December
• the complete setup two 2-channel boards in new
  enclosure with 4 calibration tones and control
  interface
• Produce enough front end boards for 63 ATF BPMs
• Install and test system in late Spring
• Beam physics studies as soon as system is
  available BBA, ORM
• Proposed additional experiment in December to
  test Septum area BPM with SLAC downconverter
  Echotek