First Results of Splice mapping in the main circuits of Sector 12.

MP3, 30/09/2009, Z.Charifoulline 1

First Results of Splice mapping in the main circuits of Sector 12.

“Special” PLI2.s1 tests were done on RB.A12 and RQ.A12:

-RQD/RQF, 24/09/2009, 17h15-21h45;- RB, 25/09/2009, 18h30-21h00;

The current steps: 0,760A,1200A,1600A,2000A,…,0 (9 plateaus) The ramp rate: 10A/sThe plateau time: >10mins.


nQPS layout for bus-bar protection – example (R.Denz, MP3, 19/08/2009)

• _SPLICE signals are sent directly to analysis tools via special subscription to QPS supervision signals (developing by Odd Andreassen, additional few weeks?)

• All signals are transferred to QPS supervision and TIMBER, certain status flags as well to LASER– All signals are recorded on change; dead-bands apply only to LSB

• LSB U_RES = 1.5 nV (24bit, ±12.5mV) • LSB U_MAG = 305 nV

MB.A9L2 MB.A10L2

DCBA.9L2.R DCBQ.9L2.R DCBB.10L2.R

DCBB.10L2.R:U_RESDCBB.10L2.R:U_MAGDCBB.10L2.R:U_MAG_SPLICE

DCBB.10L2.R:U_RES_SPLICE

DCBB.10L2.R:ST_BUSBAR_OK

DCBB.9L2.R DCBA.10L2.R

“U_MAG” – magnet signal, which is total voltage drop on the “reference” magnet;“U_RES = Ubus–α*U_MAG” - bus bar signal; α=93.0E-5 (dipoles) and α=51.0E-3 (quads) – defaults values for dI/dt compensation;


nQPS layout for bus-bar protection – example (R.Denz, MP3, 19/08/2009)

• _SPLICE signals are sent directly to analysis tools via special subscription to QPS supervision signals (developing by Odd Andreassen, additional few weeks?)

• All signals are transferred to QPS supervision and TIMBER, certain status flags as well to LASER– All signals are recorded on change; dead-bands apply only to LSB

• LSB U_RES = 1.5 nV (24bit, ±12.5mV) • LSB U_MAG = 305 nV

MB.A9L2 MB.A10L2

DCBA.9L2.R DCBQ.9L2.R DCBB.10L2.R

DCBB.10L2.R:U_RESDCBB.10L2.R:U_MAGDCBB.10L2.R:U_MAG_SPLICE

DCBB.10L2.R:U_RES_SPLICE

DCBB.10L2.R:ST_BUSBAR_OK

DCBB.9L2.R DCBA.10L2.R

“U_MAG” – magnet signal, which is total voltage drop on the “reference” magnet;“U_RES = Ubus–α*U_MAG” - bus bar signal; α=93.0E-5 (dipoles) and α=51.0E-3 (quads) – defaults values for dI/dt compensation;

U_RES_SPLICE(I) = U0 + Rbus*I + {∆α*U_MAG_SPLICE(I)};U_MAG_SPLICE(I) = U0 + Rmag*I;


A12.RQD/RQF: U_RES_SPLICE vs Time & I_MEAS vs Time


A12.RQD/RQF: U_RES_SPLICE vs Time & I_MEAS vs Time


A12.RQD/RQF: U_RES_SPLICE vs I_MEAS


A12.RQD/RQF: BusSegment Reistance vs nQPS Crate













8 83218 14

Thanks to C.Lorin, F.Bertinelli for Splice Num Mapping



8 83218 14



A12.RB: BusSegment Reistance vs nQPS Crate (current flow)








32 splices


Sector A12, nQPS, Preliminary conclusion (29/09/2009):

- bus segments resistance measurement based on U_RES signals looks very promising;

- inductance compensation works well and almost done, there are few units to be fixed;

- next step will be to perform nQPS-IST and switch on the protection, I think;

- but, magnets resistance measurements based on U_MAG signals are noisy and not yet fully analyzed to be interpreted correctly;


A12.RB: Snapshots


A12.RB: Snapshots


A12.RQD/F: Snapshots


A12.RQD/F: Snapshots

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First Results of Splice mapping in the main circuits of Sector 12.

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