Dear Colleagues,

Highlights of Tuesday’s (05/07/2005) meeting for the week 26/06/2005 (Sunday ) to 02/07/2005 (Saturday):

(1) Total Magnets Tested = 19

13 Dipoles (1 with MM) + 5 SSS (0 with MM) + 1 SSS (with MM)

With ROBTC (rapid On Bench Thermal Cycle) for SSS280 (TBD1) and MBAL2193 (TBA2).

(2) Statistics of Magnets tested in the year 2005

Dipoles: Total 245 (221 Fresh + 24 Repeat)

Arc SSS: Total 96 (83 Fresh + 13 Repeat)

IR SSS: Total 8 (5 Fresh + 3 Repeat)

(3) An average of 7 magnets (MBs) under go MM (Magnetic Measurement) tests per month. Extended MM tests take 4-5 days extra.

(4) One bench might be reserved for Special tests for SSS where approximately 30 Thermal cycles will be performed on each SSS. THIS IS UNDER DISCUSSION LEVEL CURRENTLY.

(5) Marylin has installed new version of MM test named MMP660. She explained the following:

(a) We can launch the test from TEMA. The name of the test is MMP660.

(b) Now, during measurement, we can only see the signals from the coil which does the measurement. In earlier version signals from all the coils were seen, even if the coils were not involved in the measurements.

(c) For SSS: We have to keep a check on the red/green colours and analyze them.

(d) The MM position is monitored by the use of limit switches. Though we have to do fine adjustment like earlier, the difference is that the test will be launched only if the shafts are in the MM position (within the limit switches).

(e) For MM1 Run MM1 from TEMA. This is for launching the MMP application and the configuration files. Then Run “RunType”.

(6) For Survey SIMCO should be booked one week in advance. In the absence of survey people, some of the surveys had to be done by Giorgio, Salem and Guy Deferne.

This is for information only. At Present, Operation team is not responsible for booking SIMCO for survey.

(7) For SSS: For Prep 2.2C (IAP, Clamp Connection of Correctors)

Instead of connecting the two circuits (C-D & E-F) in series and running the test, as we do now, it is decided to do them separately as two separate tests. This may take away few more minutes, but it will solve the problems of interchange in connections.

Thus we do Prep2.2C with CD only and then analyze the generated file. Then we do Prep2.2C with EF only and analyze the respective generated file.

(8) On bench TBD2 (Special SSS616 – Q9) there were wrong results for field strength measurements at 5390 A.

Below are given the files to be used for such measurements.

Consider Special SSS Q10 and for first run of the following tests:

(a) SW12 (Roll Angle Measurement in Aperture 1) – warm condition

measSeries Name: A1_Q10_ROLL_SW_1

zPos File: z.sss_Q10

db.File: db.sss_Q10_warm

(b) SW13 (XY Position Measurement in Aperture 1) – warm condition

measSeries Name: A1_Q10_XY_SW_1

zPos File: z.sss_Q10

db.File: db.sss_Q10_warm

(c) FS12 (Field Strength Measurement in Aperture 1@2500 A) – cold condition

measSeries Name: A1_FS2500_SC_1

zPos File: z.sss_Q10

db.File: db.sss_Q10_2500A_strength

(d) FS13 (Field Strength Measurement in Aperture 1@5390 A) – cold condition

measSeries Name: A1_FS5390_SC_1

zPos File: z.sss_Q10

db.File: db.sss_Q10_nominal_strength

Note: For Special SSS the “nominal_strength” for the db file is at 5390 A and for the Arc SSS the “nominal_strength” for the db file is at 11850 A.

(9) Donot disconnect the connector of the shaft. There was a problem on TBD1 bench due to it.

(10) When both magnets on one cluster are warming or cooling down simultaneously, then we must launch Thermal Cycle test to switch on LF and record the readings.

(11) PT1 (Part I + Part II + Part III) Tests for SSS with Shafts:

We must perform the T-coil test (Part I) but we see that we cannot compensate for AC compensation (Part III). This is normal because in SSS, we are using 5 coils (A, B, C, D &E) of the shafts and we try to compensate the signal in one coil by the signal in three other coils. Hence it is not possible to compensate.

But for Dipoles, we use 3 coils (A, C & E) of the shafts and we try to compensate signal in one coil by the signal in only one other coil. Hence, here it is possible to compensate.

That is all for this week.

Have a nice week ahead.

Best regards,

Dhruva Bhattacharjee.