FQWG, 24-MAR -2006 1 R. Wolf, AT-MEL-MC

Experience making transfer functions Experience making transfer functions for LEPfor LEP

R. Wolf, AT-MEL-MCR. Wolf, AT-MEL-MC

IntroductionIntroduction Magnet & Control data base tablesMagnet & Control data base tables Making of the Transfer functionMaking of the Transfer function Work to be done for LHC (looking back to LEP)Work to be done for LHC (looking back to LEP) ConclusionConclusion

FQWG, 24-MAR -2006 2 R. Wolf, AT-MEL-MC

IntroductionIntroduction LEP Technically simpler, no time dependence, warm LEP Technically simpler, no time dependence, warm

However several LEP specific corrections to apply to the transfer functions.

Administratively simpler. On the AT side only one group Administratively simpler. On the AT side only one group involved. Now there are 3 (MAS, MTM, MEL).involved. Now there are 3 (MAS, MTM, MEL).

All magnets measured magnetically (at room All magnets measured magnetically (at room temperature) + 8 superconducting low-beta quadrupoles temperature) + 8 superconducting low-beta quadrupoles measured at 4.2K.measured at 4.2K.

Validated transfer function measurements of each LEP magnet, including correctors, stored in Oracle database tables of the magnet database.

Only transfer functions of circuits present in the control Only transfer functions of circuits present in the control system database.system database.

FQWG, 24-MAR -2006 3 R. Wolf, AT-MEL-MC

Magnet & Control data base tablesMagnet & Control data base tables

FQWG, 24-MAR -2006 4 R. Wolf, AT-MEL-MC

(Intermediate) Magnet DB: Transfer (Intermediate) Magnet DB: Transfer functions of individual magnets functions of individual magnets

FQWG, 24-MAR -2006 5 R. Wolf, AT-MEL-MC

From data in the intermediate magnet From data in the intermediate magnet databasedatabase

Making of the LEP Transfer functions 1Making of the LEP Transfer functions 1

FQWG, 24-MAR -2006 6 R. Wolf, AT-MEL-MC

Making of the LEP Transfer functions 2Making of the LEP Transfer functions 2

Additional corrections/parametersAdditional corrections/parameters Proximity correction on transfer function for orbit correctors Ramp Starting delays according to the vacuumchamber type

(compensation of main component of vacuum chamber eddy currents) Current to inject in main quadrupoles and sextupoles to compensate

for quadrupole and sextupole components of vacuumchamber eddy currents

Setup cycling of the magnet circuits was to be defined.Setup cycling of the magnet circuits was to be defined.

Finally in all LEP lifetime 494 distinct transfer functions Finally in all LEP lifetime 494 distinct transfer functions and 66 distinct cycles were made and put in the control and 66 distinct cycles were made and put in the control database.database.

FQWG, 24-MAR -2006 7 R. Wolf, AT-MEL-MC

Control DB: Magnet Families Control DB: Magnet Families (circuits)(circuits)

1164 entries1164 entries

FAMILY_NAME OFFSET DELAY CYCLE_ID CAL_ID CLASS STRENGTH_NAME STRENGTH_TYPE PC_NAME PC_TYPE DESCRIPTION LAST_UPDATECH.QF19.L1 0 0.042 CH2.5 CHP1 MCH KCH19.L1 KICK RM131CH F1 12/03/1991CH.QF19.L2 0 0.042 CH2.5 CHP1 MCH KCH19.L2 KICK RM230CH F1 12/03/1991CH.QF19.L3 0 0.042 CH2.5 CHP1 MCH KCH19.L3 KICK RM331CH F1 12/03/1991MB2 0 0.004 B4725 MB105 MB2S KMB2TOT ANGLE RM2B1 S New calibration for 105 GeV 01/07/2000MINWIG 0 0 MW55 MINIWIG BEWI KMINWIG ANGLE RB1EWI E1 obsolete f rom shutdow n 94-95 replaced by RB1EWIR04/05/1995OCT2.L2 0 0.065 OCT55 OCTR MO KOCT2.L2 K3 RM247OCT E1 run_scheme >= sup94_405/29/1996 09:55:08QD 0.04 0.004 Q420 QD100 MQ KQD K1 RM2QD A460 02/17/1999 14:11:05QF -0.342 0.004 Q470 QF100 MQ KQF K1 RM2QF A470 02/23/2000 15:48:58QFQD-COMP 0 0.004 NULL 2COMP DUMMY QFQD-DIFF - RM2COMP E2 Compensator - a bus-bar running around LEP (J. Poole)03/29/1995 14:47:07QL1.1 0 0.057 QA320 QL1.1-100 MQA KQL1.1 K1 RM1QL1 C64300 02/17/1999 14:12:24QL1.3 0 0.057 QA320 QL1.3-100 MQA KQL1.3 K1 RM3QL1 C64300 02/17/1999 14:12:24QL1.5 0 0.057 QA320 QL1.5-100 MQA KQL1.5 K1 RM5QL1 C64300 02/17/1999 14:12:24QL1.7 0 0.057 QA320 QL1.7-100 MQA KQL1.7 K1 RM7QL1 C64300 02/17/1999 14:12:24QL11.1 0 0.057 QA300 QL11.1-100 MQA KQL11.1 K1 RM1QL11 C64300 05/28/1996 18:32:35SD1.2 0.077 0.059 SD240 SD1.2-100 MSD KSD1.2 K2 RM2SD1 B240 11/04/1996

FQWG, 24-MAR -2006 8 R. Wolf, AT-MEL-MC

Control DB: Transfer functions of Control DB: Transfer functions of circuitscircuits

magnetperdzN- N

!1 B

FQWG, 24-MAR -2006 9 R. Wolf, AT-MEL-MC

Control DB: CyclesControl DB: CyclesCYCLE_ID NB_OF_CYCLES IMIN IMAX BMIN BMAX DESCRIPTION LAST_UPDATEB2900 5 300 2900 285.207 1356.91 07/20/1989 18:09:23B3300 5 300 3300 285.207 1545 10/02/1995 00:00B4480 5 300 4480 285.207 2081.8 04/10/1996 00:00B4725 5 300 4725 285.56 2197.01 For 105GeV, R. Wolf 10/22/1999 00:00:00BI340 5 17 340 3.115872 20.28598 07/20/1989 18:09:23BI500 5 17 500 1.086979 31.64441 04/20/1993 14:52:03BI500S 5 25 500 PC min to PC max 04/20/1999 18:01:41BI520 5 17 520 1.086979 32.91 New cycle for 2000, extrapolated BI500 02/23/2000 16:00:47CB55 2 -55 55 -0.073326 0.073229 07/20/1989 18:09:23CC55 2 -55 55 -0.067822 0.067867 07/20/1989 18:09:23CH2.5 2 -2.5 2.5 -0.031418 0.031418 07/20/1989 18:09:23CHA5 2 -5 5 -0.03968 0.03968 07/20/1989 18:09:23CV2.5 2 -2.5 2.5 -0.020552 0.020552 07/20/1989 18:09:23CVA5 2 -5 5 -0.032858 0.032858 07/20/1989 18:09:23CVD2.5 2 -2.5 2.5 -0.017545 0.017545 05/07/1992 11:44MW45 3 5 45 0.011 0.103 05/06/1993 00:00MW55 3 -55 55 -0.103 0.103 05/24/1994 00:00:00MW60 3 5 60 0.011 0.13474 07/20/1989 00:00:00NULL 1 -5 5 -0.15 0.15 Fake for QFQD-COMP 03/29/1995 14:31:21OCT55 0 -55 55 -522.5 522.5 03/04/1992 08:56PW500 1 25 500 0 0.9925 03/06/1991 11:55PWT50 0 -50 50 0 0.9925 03/06/1991 11:57Q275 3 27.5 275 0.833 8.219264 07/20/1989 18:09:23Q340 3 27.5 340 0.833 11.83 10/03/1995 00:00Q360 3 27.5 360 0.833 10.74 04/28/1994 00:00:00Q420 3 27.5 420 0.833 12.5 10/23/1995 00:00:00Q460 3 27.5 460 0.833 13.6 07/20/1989 18:09:23Q470 3 27.5 470 0.833 13.9 New cycle for 2000, increased from 460 02/23/2000 15:48:41Q485 3 27.5 485 0.833 14.3047 07/20/1989 18:09:23Q520 3 27.5 520 0.833 15.16 07/20/1989 18:09:23

FQWG, 24-MAR -2006 10 R. Wolf, AT-MEL-MC

The work to be done (looking back to LEP)The work to be done (looking back to LEP)

First stage and main job: defining and making all First stage and main job: defining and making all appropriate measurements.appropriate measurements.

Complete putting validated results in tables (Oracle in the Complete putting validated results in tables (Oracle in the LEP case) so as to be reasonably well accessible.LEP case) so as to be reasonably well accessible.

Agree with the operations people what is needed for LHC Agree with the operations people what is needed for LHC and in which format (AT & AB)and in which format (AT & AB)

Second stage (up to 1-st circulating beam)Second stage (up to 1-st circulating beam) Make intermediate measurement DB for easy access, Make intermediate measurement DB for easy access,

which is suitable for automatic generation of the field which is suitable for automatic generation of the field model for all circuits.model for all circuits.

Implement the magnet-related part of the control Implement the magnet-related part of the control database (AB’s job)database (AB’s job)

Determine transfer function and setup cycles for circuits Determine transfer function and setup cycles for circuits with help of the layout database(s)with help of the layout database(s)

Make various corrections/improvements based on Make various corrections/improvements based on measurements going on in parallel/cold-warm measurements going on in parallel/cold-warm correlations/......correlations/......

FQWG, 24-MAR -2006 11 R. Wolf, AT-MEL-MC

The work to be done (looking back to LEP)The work to be done (looking back to LEP)

Third stage (first two(?)years beam)Third stage (first two(?)years beam) Make various corrections/improvements based Make various corrections/improvements based

on magnetic and machine measurements going on magnetic and machine measurements going on in parallel. This is certain to be more on in parallel. This is certain to be more important than in LEP because of the time-important than in LEP because of the time-dependent nature of the field of the magnets dependent nature of the field of the magnets build with rutherford cables build with rutherford cables

Fourth stage (from year three).Fourth stage (from year three). Important improvements to machine coming Important improvements to machine coming

closer (luminosity upgrade...)closer (luminosity upgrade...) Not to forget stage 1.5, the sector test..............Not to forget stage 1.5, the sector test..............

FQWG, 24-MAR -2006 12 R. Wolf, AT-MEL-MC

ConclusionConclusion Measurements to be completed and valid data to be Measurements to be completed and valid data to be

properly stored for all magnets.properly stored for all magnets. It is urgent to agree with AB on the information to It is urgent to agree with AB on the information to

transmit and on it’s format. Operation people should be transmit and on it’s format. Operation people should be systematically involved from now on.systematically involved from now on.

Need to appoint an AT person who is full-time Need to appoint an AT person who is full-time responsible for the practical transmission of the field responsible for the practical transmission of the field model in the control system and who should have model in the control system and who should have professional database support.professional database support.

On going magnetic measurement program and On going magnetic measurement program and improvement of the field model to be expected for at improvement of the field model to be expected for at least two years after start-up.least two years after start-up.