BPM support and beam pipe length

FD support statusA.Jeremie

Schedule• This week move all the material to “final” table• Sensors come back from CERN July 8 : rare

access around LHC! (coherence measurements)• Do vibration measurements without water but

all the parts July 8 to 11• Do vibration measurements with water July 11

to 18• July 21 to 25 pack everything and prepare

transport• Team of 3 arrives at KEK for 2 weeks on

September 15

Once at KEK September-October discussions with Terunuma-san

• FD surface preparation (KEK or LAPP?) Needs to be ready before we arrive

• measure quad poletips after transportation (is this needed at this stage if we later open the magnets for BPM installation)

• Install plates, drill holes in floor and bolt them on floor• Install table on plates (need crane)• Install movers • Install magnets on movers (need crane) (easier to move magnets

without the BPMs installed)• Open and close magnets for final BPM installation (who?)• Adjust position of BPM wr to magnet• Adjust magnet position wr to beam position and table (geometry

team?)

Did we forget something?

SBPM position w.r. to magnet

SBPM

Sextupoles

Quadrupoles

IP

QD0QF1SF1 SD0

The distance between SBPM and magnet are given from the magnet core to the SBPM “left frame” (see next slide)

FD layout

The distance between SBPM and magnet are given from the magnet core to the SBPM “left frame”

20mm

For the quad, it’s from the “red” core to the SBPM “left frame”

30mm

Readout point here at hole or is it at middle of this piece?

Distance to readout point:Sextupole=>45.5 (45)mmQuadruploe=>55.5 (55)mm

S-band BPM support

Adjustable in beam direction

Adjustable in height with washers

Adjustable transversally on intermediate support (not shown)

Al

SS

What are the requirements for the range (0.5-1mm precision)?Along the beam we let 30mm range even if we later decided on the position of the BPMIn height, we use washersIn the transverse direction we have two solutions: an easy solution centered with 2mm adjustment or if needed an additional plate with a larger range (?)

This is how the BPM is supported

We chose to put BPM on the electrical connection side of sextupole

Beam pipe length

• M.Woodely’s slides

FD configuration (T.Okugi’s presentation)

SBPMQC3

SBPMFFTB2.13

S3.00

SF1FF QF1FF

100 100

450.1 200

180

SBPMQC3

SBPMFFTB2.13

S3.00

SD0FF QD0FF

100 100

76.2

450.1200

18076.2

785380785380

2630

Sw

eeping

Hond

a Shintak

e

IP=>Table=2400

• sextupole S-BPM chamber shown as 380 mm flange-to-flange• quadrupole S-BPM chamber shown as 785 mm flange-to-flange• sextupole S-BPM upstream flange to sextupole pole face shown as 180 mm• quadrupole pole face to S-BPM downstream flange shown as 200 mm

Woodley’s Dimensioned Sketchesusing Okugi-san’s original chamber lengths for the S-BPMs

scale: 6 inches (drawing) = 1 meter (beamline)

FF: SF1FF and QF1FF

SBPM

QC3

SBPM FFTB2.13

S3.00

SF1FF QF1FF

76.2

450.1

575

200180

MSF1FFMQF1FF

311.9

785380

45 6553.1

scale: 6 inches (drawing) = 1 meter (beamline)

FF: SD0FF and QD0FF

SBPM

QC3

SBPM FFTB2.13

S3.00

SD0FF QD0FF

76.2

450.1

200180

MSD0FFMQD0FF

311.9

575

450.145 6553.1

785380

Woodley’s Dimensioned Sketchesnew chamber lengths for the S-BPMs that allowfor 100 mm bellows module between S-BPMs

• sextupole S-BPM chamber: 360 mm flange-to-flange• quadrupole S-BPM chamber: 755 mm flange-to-flange

scale: 6 inches (drawing) = 1 meter (beamline)

FF: SF1FF and QF1FF

SBPM

QC3

SBPM FFTB2.13

S3.00

SF1FF QF1FF

76.2

450.1

575

200180

MSF1FFMQF1FF

311.9

755360

45 65103.1

100

scale: 6 inches (drawing) = 1 meter (beamline)

SBPM

QC3

SBPM FFTB2.13

S3.00

SD0FF QD0FF

76.2

450.1

575

200180

MSD0FFMQD0FF

311.9

755360

45 65103.1

100

FF: SD0FF and QD0FF

Mover preparation

Empty mover for finding “lowest” position:Flat section should show on top

Three LVDTs (Linear Variable Differential Transformer) measuring magnet position for mover control

There is a “special” mover sextupole V-plate that does not allow positioning of this LVDT=> LVDT attachment modification and glass plates for good surface quality

Photo of the “good” V-plate…to show the position of LVDT

Preliminary vibration measurements

Presented by B.Bolzon at Nanobeam2008

Table fixed on one entire face to the floor

Integrated RMS of table relative motion to the floor

Above 0.2Hz with weight of FD on table: relative motion = 3.5nm

Very good compared to ATF2 tolerances (10nm)!!!

In reality, should be lower because measurement errors of 1% induce relative motion calculation errors of 1.6nm (GM at KEK > 0.2Hz: 164nm)

Integrated RMS of sextupole relative motion to the table

Vibratory study of an ATF2 sextupole with its supports

Between 0.7Hz and 13Hz: inaccurate measurements (low Signal to Noise Ratios and GURALP rocking on the magnet)

Above 13Hz: relative motion of 0.26nm

Very good compared to ATF2 tolerances (10nm)!!!

Vibratory study of an ATF2 quadrupole with its supports

Integrated RMS of quadrupole relative motion to the table

Below 2.1Hz: inaccurate measurements (low Signal to Noise Ratio)

Above 2.1Hz: relative motion of 2.4nm

Very good compared to ATF2 tolerances (10nm)!!!

Pending questions• Glass slide refurbishing for LVDTs• Suggestion of M.Woodley for the beam-pipe length

w.r. to bellow length• Position of BPM w.r. to magnet core=> BPM support

finalising• No answer yet for Benoit’s financing (for his 1 year

stay: should have answer in coming weeks)• Trouble finding thin shims but still searching (for the

moment 0.5mm)• Beeswax customs?• Prepare customs for sending the material in September• Register at KEK for radiation matters (we all had

specific medical visits for radiation)

Left frame; small diameter

Left support; large diameter

Center frame

Right cap

Magnet side Beam pipe side