# Presentation: 468165

##  Summary of Engineering Meetings

-   High Power Target Experiment
-                     CERN
-        March 30-April 2, 2004

## Main characteristics of power converter type ALICE/LHCb, rated 950V, 6500A

- 2 x Power transformers in parallel, housed in the same cubicle

- 2 x rectifier bridges in parallel

- High precision current control electronics

***Total DC output ratings:***
- 6500Adc, 950Vdc, 6.7 MW

***AC input ratings***
***(per rectifier bridge):***
- 2858Arms, 900Vac (at no load), 4.5 MVA

***Each power transformer ratings***
*Primary side: *154Arms, 18kVac
*Secondary side:* 3080Arms, 900Vac
*Nominal power:* 4.8 MVA

***Other***
*- Air forced cooling;*
*- Fed by two18 kV lines*

## Main technical details still to be verified

**Main technical details still to be verified**

***Best solution for connecting to a 18kV cell (CERN TS-EL group)***
*** ******- ***one available cell at building 269;
-  - one available cell at building 193 (AD);
-  - two used cells at building 287 (A7) – check for the possibility of joining a new 				one temporarily ?;
- - check for other solutions, if any
***Location of the power converter***
***(CERN AB/PO group)***
*** ******- ***One solution,*** still need to be verified!!!!***
*** ***In the ISR gallery,
- availability of the space?? ( today used
- for storage of material);
- the capacity of the existing crane?
-  - check for other solutions, if any
***Cabling paths for the power lines***
***(CERN TS/EL group)***

## MARS Dose Calculation

- Pulsed Solenoid

- Iron

- Copper

- Hg Jet

## Residual Contact Dose Rate

- Assume:
- 200 pulses
- 16 x 1012 protons/pulse average
- 30 days running
- Then the contact radiation on the iron exterior will be:
- After 1 hr      40 mrad/hr
- After 1 day    21 mrad/hr
- After 1 week 13 mrad/hr
- After 1 mo.     5 mrad/hr
- After 1 year     1 mrad/hr

## End of Exposure- 1 Month delay

- Elements      Curies
- hg	0.00043070
- au	0.00034510
- te	0.00028140
- ir	0.00027650
- ag	0.00026910
- in	0.00023670
- sn	0.00023540
- eu	0.00018110
- rh	0.00018070
- i	0.00014630
- xe	0.00014040
- gd	0.00012370
- pd	0.00012230
- cs	0.00012100
- w	0.00011980
- Total         4.3 x 10-3 Curies

- Important contributing Isotopes
- (up to 1%  of activation levels)
- Hg  203                         4.3 x 10-4 Curies
- Au  195                         3.1 x 10-4 Curies
- Te  121                          2.3 x 10-4 Curies
- Ir    188, 189           9.6 x 10-5 Curies   1.7 x 10-4 Curies
- Ag  105                         2.0 x 10-4 Curies
- In   113                          2.3 x 10-4 Curies
- Sn  113                          2.3 x 10-4 Curies
- Eu  146, 147          5.7 x 10-5 Curies    6.5 x 10-5 Curies
- Rh  103                         1.3 x 10-4 Curies
- I     125                          1.4 x 10-4 Curies
- Xe  127                          1.4 x 10-4 Curies

## End of Exposure- 1 Year delay

- Elements      Curies
- au	0.00011470
- ag	0.00004882
- cd	0.00004671
- in	0.00004633
- sn	0.00004630
- ta	0.00001930
- gd	0.00001678
- lu	0.00001345
- os	0.00001287
- ce	0.00001223
- rh	0.00001145
- pm	0.00001097
- w	0.00001089
- sm	0.00001046
- hf	0.00000957
- Total         4.9 x 10-4 Curies

- Important contributing Isotopes
- (up to 1%  of activation levels)
- Au  195                  1.1 x 10-4 Curies
- Ag  109                  4.7 x 10-5 Curies
- Cd  109                  4.7 x 10-5 Curies
- In   113                  4.6 x 10-5 Curies
- Sn  113                   4.6 x 10-5 Curies
- Ta  179                   1.9 x 10-5 Curies
- Gd  151, 153           7.4 x 10-6 Curies    8.1 x 10-6 Curies
- Lu  172, 173           5.3 x 10-6 Curies     8.1 x 10-6 Curies
- Os  185                   1.3 x 10-5 Curies
- Ce  139                   1.2 x 10-5 Curies
- Pm  143                  9.3 x 10-6 Curies
- Sm  145                  1.0 x 10-5 Curies
- W   181                   1.1 x 10-5 Curies

## Issues Remaining

-  What is the beam profile on the nTOF lead target without the Hg target and without the pulsed solenoid on.
-  What are the beam intensity constraints for the nTOF target.  4 x 7x1012 protons in 16 seconds is mentioned as a constraint.  What if it all comes in one μs.
- What is the impact of the experiment’s beam windows on the nTOF target.
- Is the isotope inventory acceptable.  Thomas Otto will reply.
- A continual issue is the lack of ventilation in the nTOF tunnel.  nTOF itself is threatened with shutdown beginning in 06 if the issue is not resolved.
-  ODH (oxygen deficiency hazard) related to LN2 operations must be addressed.
- Personal Radiation Plan

## Experiment Site Considerations

- Nufact Study 2 Beam Parameters:
-  16 TP (1012 Protons) per bunch      24 GeV, 1 MW Scenario
-  32 TP per bunch (x2 rep rate)         24 GeV, 4 MW Scenario
- BNL capabilities
- 4 TP per bunch    E951  experience
- 6 to 8 TP foreseen (with bunch merging)
- No multi-bunch single turn extraction (g-2 rebuild)
- CERN capabilities
- 5 TP per bunch    normal operation
- 7 TP multi-bunches foreseen (for CNGS)
- Multi-bunch single turn extraction available
- 4 bunch flexible fill of PS from booster available                       Pump-Probe
-                                                                                              capability