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cryogenics

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TH-07 Operational Experience of the Superconducting LINAC Booster at Mumbai linac, controls, cavity, acceleration 174
 
  • V. Nanal, R.D. Deshpande, J.N. Karande, S.S. Jangam, P. Dhumal, R.G. Pillay, M.S. Pose, C. Rozario, S.K. Sarkar, S.R. Sinha
    TIFR, Mumbai
  • S.K. Singh, B. Srinivasan
    BARC, Mumbai
 
 

The su­per­con­duct­ing LINAC boost­er, in­dige­nous­ly de­vel­oped to boost the en­er­gy of the heavy ion beams from the 14 MV Pel­letron ac­cel­er­a­tor at TIFR, Mum­bai, has been fully op­er­a­tional since July 2007. The LINAC con­sists of seven mod­u­lar cryostats, each hous­ing four lead plat­ed quar­ter wave res­onators, de­signed for an op­ti­mum ve­loc­i­ty β0=0.1 at an op­er­at­ing fre­quen­cy of 150 MHz. In order to main­tain a sta­ble phase and am­pli­tude of the elec­tric field in the cav­i­ty, the RF con­troller cards based on a self-ex­cit­ed loop (SEL) with phase and am­pli­tude feed­back have been de­vel­oped in­dige­nous­ly. The cryo­genic sys­tem for the LINAC has been de­signed for a typ­i­cal power dis­si­pa­tion of 6 W in each res­onator. Ini­tial beam tri­als have yield­ed av­er­age en­er­gy gain of 0.4 MV/q per cav­i­ty cor­re­spond­ing to 80% of the de­sign value. Op­er­a­tional ex­pe­ri­ence of the LINAC, name­ly, em­pir­i­cal­ly de­vised pro­ce­dures for the ac­cel­er­a­tion of dif­fer­ent beams and RF set­tings, and as­so­ci­at­ed de­vel­op­ments are pre­sent­ed.

 

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C-07 Upgrade of the Control System for the ALPI Cryogenic Distribution Plant controls, linac, vacuum, interlocks 271
 
  • S. Canella, A. Beltramin, A. Calore, T. Contran, P. Modanese, F. Poletto
    INFN/LNL, Legnaro
 
 

In the LNL Heavy Ion Ac­cel­er­a­tor Com­plex, ALPI is a su­per­con­duct­ing lin­ear ac­cel­er­a­tor (Linac) whose first runs date back to 1993. In more than 15 years the LNL ALPI Linac evolved from an ini­tial small con­fig­u­ra­tion of 5 cryostats and 16 res­onators to the ac­tu­al size of 20 cryostats and 74 res­onators. The su­per­con­duct­ing char­ac­ter of ALPI im­plies the avail­abil­i­ty of a large cryo­genic plant and dis­tri­bu­tion sys­tem to sup­ply the liq­uid he­li­um nec­es­sary to keep the res­onators at 4.2 K. While the Linac struc­ture has grown in the years and, in the mean time, the re­lat­ed cryo­genic plant and dis­tri­bu­tion sys­tems were en­larged and up­grad­ed twice, the re­lat­ed con­trol sys­tem re­mained large­ly un­changed in its main parts and it is now the first sub-sys­tem that ur­gent­ly needs a deep re­new­ing. The chal­lenge to ren­o­vate a work­ing con­trol sys­tem with lim­it­ed shut-downs is the sub­ject of this pre­sen­ta­tion.