ATF logbook: http://atf.kek.jp/twiki/bin/view/ATFlogbook/Log20130412o

present: Alexey, Jochem, Young-Im

stability data taken: bpmAllLog_20130412_010024.dat.gz

tunnel access to look at IPREF-x

remove amplifier from IPREF-x and remove some attenuation.

add attenuator to QD10BFF-y (had no attenuation previously)

01:30 beam back on

IPREF-x not fixed.

beam off

LO back the way it was. amplifier on , attenuation on. swapped electronics channel 2

02:00 beam back on

IPREF-x not fixed. check later and move on.

calibrate QD10BFF-x (saturated) QD10BFF-y

Resolution data after the calibration bpmAllLog_20130412_021441.dat.gz

start wakefield scan, but reference cavity mover panel not responding. tunnel access to check if power is on.

beam access to look if MREF power on. control module under IPT was not in 'remote' mode (green/red button). MREF mover working now

resolution data:

ATF feedback on

MREF scans (files and details added later):

intensity 0.4-0.5 vert. scan DR 0.28MV

MREF mover pos (0.0,0.0)

DR 0.27 MV: bpmAllLog_20130412_030752.dat.gz

DR 0.25 MV: bpmAllLog_20130412_031217.dat.gz

intensity 0.4 vert. scan DR 0.25MV

intensity 0.4 vert. scan DR 0.22MV

(<0.2MV DR unstable and beam lost)

intensity 0.4-0.5 vert. scan DR 0.31MV

intensity 0.4-0.5 vert. scan DR 0.33MV (max)

Calibration at DR RF 0.33MV

we discovered orbit feedback was disturbing for the mover magnets, so switched to sextupole CBPMs (sextupoles were switched off) charge : 0.3-0.4

intensity 0.4-0.5 hor. scan DR 0.28MV

Calibration at DR RF 0.22MV, charge 0.3-0.4

ATF feedback off

intensity 0.4->0.3 vert. scan DR 0.28MV

ERROR in the bump SVD calibration script

Svd subtraction was not used during the initial calibration due to this error bpmAllFsBumpCalibration_20130412_061810.dat.gz

Traceback (most recent call last):
  File "./bpmSvdFsBumpCal.py", line 97, in ?
    main()
  File "./bpmSvdFsBumpCal.py", line 63, in main
    dfn = fsb.calibrate(npulse,startpos,endpos,nstep)
  File "/atf/control/epics/atf2/cbpm/run/Bpm.py", line 3596, in calibrate
    self.ld.write(self.f)
  File "/atf/control/epics/atf2/cbpm/run/Bpm.py", line 2398, in write
    for v in self.bump[ind] :
IndexError: list index out of range

Calibration at DR RF 0.28MV, feedback off charge 0.2-0.3

tuning of beam by Araki-san

beam intensity scan up to 0.45

charge 0.45

vert mover scan

charge 0.4 (later 0.35)

resolution data: bpmAllLog_20130412_073500.dat.gz

vert mover scan

charge 0.3

resolution data: bpmAllLog_20130412_074907.dat.gz (but charge went up to 0.35! .. sun rising..)

resolution data: bpmAllLog_20130412_075227.dat.gz

vert. mover scan

charge 0.25 -> 0.20

vert. mover scan

charge 0.20

vert. mover scan

charge 0.15

vert. mover scan

charge 0.10

vert. mover scan