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Reports until 10:37, Thursday 18 July 2013
H1 SEI
vincent.lhuillier@LIGO.ORG - posted 10:37, Thursday 18 July 2013 (7121)
Guidelines BSC-ISI-HEPI

Here are some instructions to ramp up the HEPI and the ISI

1- SUS must be damped (SUS watchdogs are connected to ISI)
2- ISI must be ONLY damped (using the "Command window")
3- Ramp up the feedforward using a gain of 1 in X, Y, Z. No feedforward in the other directions
4- HEPI can be controlled in position or with a IPS-L4C blend
    1- Position control uses the IPS only. In BLND block, FM2 filter must be engaged for position control
    2- There are 3 sets of Isolation filters in the ISO Block (Level 1 are the filters dedicated for the IPS-L4C blend, Level 2 are filters for position control with UGF at 100mHz, Level 3 are filters for position control with UGF at 5Hz). USE Level 2 or level 3 for now
5- Ramping up the ISI
    1- Super sensor of stage 1 must use L4Cs when ramping up (T240 might saturate due to DC position offsets) Press 750mHz
    2- Super sensor of stage 2 can be ramped with GS13 blended at 250mHz
    3- Go to command and press Isolate Level 3 (40Hz UGF on stage 1, 32Hz UGF on stage 2)
    4- Wait few seconds (till  the T240s input values are less than 2000counts)
    5- Lower the Blend frequency on stage 1 and introduce the T240s in the blend. Press T250mHz in all DOFs. Additional filters (T100mHz and T100mHz_0.44) can also be used to get some isolation at 0.44Hz (QUAD first pitch mode)
6- HEPI offloading. In ISC Mon. Turn on control in Y
7- Sensor correction (tricky during the day due to install activities)
    1- Ramp up the sensor correction on stage 1 (Turn on the output switch and ramp up the gain to 1 in the GND bank)
    2- Ramp up the sensor correction on stage 2 (Turn on the output switch and ramp up the gain to 1)

This applies for the three BSC-ISIs (except HEPI on BSC1 )

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