SPS OP tricks & tips


Access

The SPS access chains are described in this document !


DB/PAGE1

The Java program runs on LSASRV1 and is started by the script "/local/sps-teletext-fixdisplay/sps-tf". It generates a text file (page1.txt) after the end of the SFTPRO1 cycle. Every time that text file is regenerated, a shell script picks up the file and sends it to the HP-UX teletext process on PCRSRV9. The script "update-teletext" is located in the directory /user/alaser/bin/.
 
The generated page is just a first version and still needs further configuration and refinement, but it allows operators already to display comments (edited via the Java Page1 comment editor "Page1 Comment", located in the CCM menu "Operation").


Measurements & controls

MOPOS : falling edge of gate --> sampling
 
MPS : in case of problems - check mrsba3

MuGef : server on abcmw1 : wreboot -N mugefServer

 

Orbit

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

RF

 
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
        /ldisk/rtmp/SLRF/RFSCF1/Meas...BA3/LISTINGS

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
        Frf measurement device : set 'Ext arm enable', gate length 300 ms       
        Cycle time set with delay #3 in rack RA9407 (SC time !)


Dump

    Below 37 GeV           TIDH
   Above 100 GeV         TIDV

    2004 Dump synchronization - 16.8 us delay

Magnetic Field

    SC540    450 GeV        2.0251 T
    SC540    26 GeV          0.1167 T


FT BEAMS

Targets

    Width of the targets is 160 mm, height ~ 2-4 mm.
IONS

    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
 

Targets :

        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).


LHC

RF :

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.
   

PSB extraction order : 3 4 2 1 (for all LHC beams).

To check : injection pulse counter (phase sampling) -> prevent injection

Blowup

Damper - module 208 , plhc, DTU H next - if connected

Octupoles : few units
 

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