QF1 vibration status A.Jeremie A.Jeremie, N.Geffroy, drawings by Araki-san.
BPM support and beam pipe length FD support status A.Jeremie.
-
Upload
roderick-jones -
Category
Documents
-
view
218 -
download
0
Transcript of BPM support and beam pipe length FD support status A.Jeremie.
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