SPS OP tricks & tips
The SPS access chains are described in this document !
Measurements & controls
MOPOS : falling edge of gate --> sampling
MPS : in case of problems - check mrsba3
MuGef : server on abcmw1 : wreboot -N mugefServer
Orbit corrector calibration factors :
q[mrad] = I[A] * 1000 / ( Kfac * P[GeV/c] )
with Kfac = 627 (V) / 340 (H)
Imax = 3.5 A
qmax = 396 mrad H / 214 mrad V @ 26 GeV/c
Pre-pulses for extraction
RF module 23 / extraction window
Check on rack RA9621 / Sum out
Btrain for field measurements
RF module 96 : out1 (start), out2 (step), out3 (number, max = 256)
beware of trigger event & preset from Module 91
RF module 91 : out2 defines preset values !
Acquire from measurements_ba3 --> btrain (beware of event !)
Data can be found on rfscf1 in
RF frequency measurement
RF synchro diagnostic -> Operation
Restart measurement --> wait for 1/2 cycles
Read results --> gives the reference (only for injection) and
the measurement over 100 ms (4 Hz accuracy)
RF module 28 : out 1 defines the start of the measurement
Measurements in Faraday cage :Use FRF M in rack RA9409
synchronization - 16.8 us delay
Magnetic FieldSC540 450 GeV 2.0251 T
Width of the targets is 160 mm, height ~ 2-4 mm.
Scintillator in TT10 : BSG/BSI 1027 --> in !
Q-meter : gain to 2030/2040 (to add extra low-noise amplifier in chain)
MOPOS : first turn set BA1 RF system to LHC
T2 can be in proton mode (with target head) or ion mode (target out).
In the later case, wobbling bend #2 is used as splitter magnet (using TAX motor).
The beam is no longer focused on target, it can be observed on BTV2309 (90 deg tilt).
RF frequency h=4620 :
FT 200 394 170 Hz frev 43.375 kHz Trev 23.0546 ms
FB 200 264 560 Hz frev 43.347 kKz Trev 23.0695 ms
4338 turns / ms
batch separation : 72 bunches + 8 'empty bunches' --> 80 x 25 ns -> 400 x 2.5 ns = 400 buckets
RF phase sampling :
12 bunches -> 3480
72 bunches / single bunch -> 3550.
extraction order : 3 4 2 1 (for all LHC beams).
To check : injection pulse counter (phase sampling) -> prevent injection
Damper - module 208 , plhc, DTU H next - if connected
Octupoles : few units